What is dfc in the monitor menu. New from LG Technology: The world's highest monitor contrast ratio has been achieved. Maximum and minimum brightness

General characteristics

Peculiarities

The classic version of a portable heart rate monitor. It consists of a chest-mounted transducer with an elastic strap and a watch-like receiver located on the wrist. This device is irreplaceable:

For professional athletes and amateur athletes who want to train with maximum performance
- for everyone who wants to lose weight
- for people with heart disease

The chest strap heart rate monitor is commonly used in cycling sports such as running, cycling, swimming, and cross-country skiing. Main advantage chest heart rate monitor- accuracy of measurements. It qualitatively measures your heart rate in any situation - whether you are at rest, engaged in light physical work, or actively involved in sports. The second important plus of the device with a chest strap is that you do not need to take any additional steps to measure the pulse: the heart rate is always displayed on the receiver screen.

Heart rate sensor functions

The DFC W117 cardiac sensor uses analog data transmission and allows you to monitor 3 possible heart rate zones. Additional features of the wrist monitor:

Time / date / alarm;
- calculator of burned calories;
- Configurable upper and lower heart rate limit with audible signal;
- maximum, average value and% of the maximum heart rate value;
- chronograph;
- backlight of indications of the monitor.

Delivery in Moscow + 10 km from MKAD Attention!

Delivery across Russia

The equipment is dispatched no later than the next day after the receipt of funds to the seller's account

Attention!

If you do not have an elevator, the rise to the floor is paid: from 50 to 200 rubles, depending on the dimensions and weight of the cargo. If the packaging does not pass through the doorways and staircases, the master will offer to lift / transfer in parts, having opened the packaging beforehand. Payment takes place BEFORE opening and before the start of actions to lift / transfer the package. After opening, it is necessary to check the equipment for the presence external damage, it is the responsibility of the client to ensure that the lift is properly lifted after opening.

The customer can carry out the lifting work independently after paying for the simulator.

Still have questions? Call the toll free number: 8-800-1000-682

Warranty repair and return

Every product purchased from our store is covered by the manufacturer's distributor's warranty. Warranty and service maintenance takes place in specialized service centers, about which you can find out in the warranty card, the basis for the provision of warranty service are documents that must be transferred to the buyer when buying any equipment by a specialist, courier, forwarder delivering the equipment.

Warranty obligations Obligations of the Buyer:

Warranty repair and return

Every product purchased from our store is covered by the manufacturer's distributor's warranty. Warranty and service maintenance takes place in specialized service centers, which you can find out about in the warranty card, the basis for the provision of warranty service are documents that must be transferred to the buyer when buying any equipment by a specialist, courier, forwarder delivering the equipment.

Eligibility for warranty and service

Every product purchased from our store is covered by the manufacturer's distributor's warranty. Warranty and service maintenance takes place in specialized service centers, which you can find out about in the warranty card, the basis for the provision of warranty service are documents that must be transferred to the buyer when buying any equipment by a specialist, courier, forwarder delivering the equipment.

Warranty obligations

During the warranty period, the manufacturer provides free repair of manufacturing defects and defects that appeared during operation, provided that the Buyer observes all the conditions and rules of transportation, storage, installation, adjustment, maintenance and operation of the equipment established by the Supplier. Renovation work performed by an authorized qualified representative of the Supplier.

The warranty is void if:

Any damage to equipment, its components, assemblies and mechanisms caused by non-compliance with the conditions and rules of the Supplier for transportation, storage, assembly, adjustment, maintenance or the operation of the equipment. Self repair, changes or upgrades of equipment, replacement of original parts made without the written permission of the Supplier. Damage to equipment due to force majeure, including natural, man-made and social emergencies, unlawful intentional and careless actions of persons aimed at causing damage to equipment.

Obligations of the Buyer:

Keep the bill of lading, cash register receipt and warranty card. Transport, store, assemble, adjust, maintain and operate the equipment in strict accordance with the Maintenance and Warranty Manual, Operating Instructions and other recommendations of the Supplier. Notify the service department of the Supplier about the detected faults within 3 working days after the discovery of the defect

There is no video for this product.

At the end of May, LG Electronics presented on the Russian market a 23-inch W2363D gaming monitor with a resolution of 1920Ѕ1080 (Full HD) and support for NVIDIA 3D Vision technology.

Design

The LG W2363D monitor features an elegant design. With a thickness of 7.33 cm, the monitor is attached to a stand with a wide oval base, which allows you to tilt the monitor from -5 ° to 15 °. Note that the power supply in this monitor is external, and the weight of the device is only 5.2 kg.

The dimensions of the monitor without a stand are 55.55x40.95x7.33 cm, with a stand - 55.55x41.92x20.6 cm.

The surface of the screen of the monitor LG W2363D has a matte anti-reflective coating, and the plastic frame framing it is glossy black.

In the lower right corner of the monitor are located touch button power indicator, six-button touch panel monitor settings.

Specifications

The monitor LG W2363D uses a widescreen (aspect ratio 16: 9) TN-matrix with a diagonal size of 23 inches (58.4 cm).

Recall that TN-matrices are now used in most LCD monitors. These are the cheapest matrices, which are distinguished by a high pixel switching speed (low pixel response time) and, unfortunately, not very good color reproduction and small viewing angles. Another disadvantage of TN-matrices is that the black color in them is not black, that is, it is not possible to turn off the pixels so that they do not transmit light at all. This is the reason for the fact that TN-matrices do not have a very high level of static contrast, measured as the ratio of brightness on a white background to brightness (at the same settings) on a black background. True, this problem is partially solved in the LG W2363D monitor through the use of dynamic contrast enhancement technology, which we will discuss below.

The maximum resolution supported by the monitor is 1920x1080 pixels with a pixel pitch of 0.266 mm. The resolution of this monitor allows it to be classified as Full-HD.

To connect the W2363D monitor to a computer, there are three connectors: one DVI-D and two HDMI, and there is a button on the touch control panel that allows you to select a signal source. Thus, this monitor You can connect to three computers at the same time and switch between them using the source selection key.

In addition to connectors for connecting the monitor to a computer, it provides audio connectors (input / output), one of which (input) is used to connect to the audio output of the PC, and the second is used to connect headphones.

According to the declared technical characteristics, the maximum brightness of the TN-matrix used in the monitor is 400 cd / m2, and the contrast level is 70,000: 1 DFC.

Recall that DFC (Digital Fine Contrast) is a technology developed by LG to enhance contrast and improve the subjective perception of images on LCD monitors and TVs. Essentially, this is a dynamic contrast option that has little to do with static contrast. DFC technology is divided into three components: ARC, DCE and DCM.

ACR (Auto Contents Recognition) is an automatic content recognition technology. The meaning of the technology lies in the fact that the type of viewed image is determined and, depending on the type of image, the desired levels of brightness, contrast and color saturation are set.

DCE (Digital Contrast Enhancer) - digital contrast enhancement by reducing the luminescence of black areas of the image.

DCM (Digital Contrast Mapper) is a contrast distribution technology that provides an optimal contrast level.

Well, now let's try to explain everything the same, but on the fingers, without using obscure terms.

Generally, the static contrast of an LCD panel is defined as the ratio between the brightness of white and black. The difference between the concepts of static and dynamic contrast is that in the first case, the brightness of the backlight during measurements should remain unchanged. Therefore, the static contrast ratio is a characteristic of the LCD panel. In the case of dynamic contrast, the brightness of white and black is measured separately, that is, at different brightness levels of the backlight.

In order to increase the dynamic contrast ratio, it is necessary to reduce the luminance of the black color, which is easily achieved by reducing the brightness of the backlight to the minimum level. Therefore, dynamic contrast will always be much higher than static contrast.

Monitors with DFC technology track the distribution of image brightness across the display field and adjust the backlight mode accordingly. If there is a white object (R = G = B = 255) on the screen, then the contrast in this frame will not differ from the static indicator and DFC will not be able to improve it in any way. However, if there are no such objects, then it becomes possible to reduce the radiation intensity of the backlight lamps by performing the appropriate recalculation of the image in the direction of increasing brightness. In this case, the level of black luminosity will really decrease, which will have a positive effect on the perception of the picture by the viewer. Actually, this is the essence of DFC. Thus, the dynamic contrast ratio is rather abstract, and in practice it can only be achieved by alternately displaying black and white fields. This technology is important when watching movies or playing games where dark scenes are often encountered; however, it makes no sense for traditional PC work, and static contrast has a much more serious impact on image quality.

As for the other characteristics of the W2363D monitor, they are as follows.

The viewing angles of the monitor are 170 ° horizontally and 160 ° vertically. Note that in this case we are talking about viewing angles measured by the classical method of calculating viewing angles by reducing the contrast level. That is, the limiting viewing angle corresponds to the direction for which the contrast level decreases 10 times compared to the contrast level measured along the normal to the screen surface.

The LG W2363D has a claimed 3ms pixel response time (GTG). Recall that the pixel response time can mean both the total switching time from black to white (on time) and vice versa (off time) - in this case, they talk about the Black-To-White (BTW) technique, and the average switching time between with different semitones (grayscale) is the Gray-to-Gray (GTG) technique.

Note that the monitor settings provide the ability to enable or disable the RTC (Response Time Control) mode, which allows you to reduce the pixel response time to a minimum.

And the last thing to pay attention to when talking about technical characteristics ah monitor LG W2363D, is its frequency frame scan... Since we are talking about a monitor with support for NVIDIA 3D Vision technology, the vertical refresh rate is 120 Hz, while for a conventional LCD monitor it is 60 or 75 Hz.

However, you need to keep in mind that when the monitor is connected via HDMI at the monitor's native resolution of 1920x1080, the maximum frame rate can be only 60 Hz. It is possible to set the vertical scanning frequency of 120 Hz at a resolution of 1920x1080 only when the monitor is connected via the DVI-D interface. And you need to use a Double Link cable, since the traditional DVI-D Single Link cable does not support such a high frame rate at this resolution. Note that a DVI-D Double Link cable is included with the monitor, and HDMI cable- No.

Naturally, the monitor comes with active 3D glasses from NVIDIA with an infrared transmitter. Recall that the only requirement for monitors to be able to support NVIDIA 3D Vision technology is a vertical refresh rate of 120 Hz. Everything else is done at the level of the video card driver and special NVIDIA glasses. Naturally, this technology will only work with NVIDIA video cards that support it. Therefore, when purchasing a monitor with support for NVIDIA 3D Vision technology, you should also consider purchasing an appropriate NVIDIA graphics card in advance.

In order to understand what, in fact, is the difference between conventional monitors and monitors with support for NVIDIA 3D Vision technology, let's recall how the stereo image is formed.

The idea of ​​forming a stereoscopic image is not new and consists in generating two separate images for each eye, the viewpoints of which are somewhat displaced relative to each other. As a result, each eye sees its own picture, and our brain, thanks to this cunning deception, forms the illusion of a three-dimensional image.

There are several ways to form a stereoscopic image. The simplest method is based on the color separation method, which is often used in 3D cinemas. For this, glasses are used with light filters of different colors (usually blue and red) for each eye. As a result, it is possible to form different pictures for each eye and obtain a stereoscopic image.

Another way of forming a stereoscopic image is polarizing image separation. In this case, glasses with polarizing filters are used. different focus, as a result of which you can create your own picture for each eye. This method of forming a stereo image is also used in 3D cinemas.

Another way is the active shutter glasses system. Actually, this is the NVIDIA 3D Vision technology. In this case, glasses with active LCD shutters are used, which work as follows: when one shutter is open, the other is closed, and vice versa. Moreover, the response frequency of the LCD shutters is 60 Hz. The monitor, synchronized with the glasses, reproduces the image at a frequency of 120 Hz. That is, each frame is, as it were, divided into two subframes for the left and right eyes. All even frames fall into one eye, and all odd frames fall into the other. Moreover, for each eye, the frame rate will be 60 Hz, but for a monitor, the frame reproduction rate should be 120 Hz.

Naturally, with this method of forming a stereo image, the operation of the LCD shutters must be strictly synchronized with the change of frames on the monitor screen. Actually, for such synchronization, the IR transmitter is intended, which is connected to a computer and interacts with the glasses wirelessly.

Customization options

As we have already noted, a six-button is designed to control the monitor. Touchpad located in the lower right corner of the device.

In addition to the traditional brightness and contrast adjustment for all monitors, the LG W2363D has other specific settings. Brightness and contrast can be adjusted in very small steps, allowing accurate monitor calibration. The possibilities for setting up the monitor depend on what interface it is connected to. For example, when connected via any interface, you can change the brightness, contrast and sharpness, and for the HDMI interface there are additional settings that allow you to change the black level, hue and saturation.

You can also use the auto brightness mode to adjust the brightness. When activated, the ambient light sensor is activated and automatic setting the optimal brightness level of the monitor depending on the ambient light in the room.

The color control system allows you to select one of three preset modes with different color temperatures: sRGB, 6500 and 9300 K. In addition, you can independently set the color temperature by adjusting the level of each channel (R, G, B) separately for the white point.

except the listed opportunities There are many other custom settings for setting up the LG W2363D monitor, which are mainly needed when calibrating it.

In particular, since this monitor is positioned as a gaming monitor, a special TRU-LIGHT Button is provided in the control panel, which allows you to select one of the preset monitor setting modes: "Game", "Cinema" and "Music".

Testing

After getting to know the LG W2363D monitor, we just have to announce the results of its testing.

During testing, the monitor was connected to a computer via a digital DVI-D interface, and to measure its technical characteristics, a software and hardware complex was used, including a GretagMacbeth Eye-One Pro spectrophotometer, ProfileMaker Pro 5.0.5 software, basiCColor Display 4.1.9 software, digital oscilloscope BORDO 211A and photosensor.

During testing, the following characteristics of the monitor were measured:

• maximum and minimum brightness;
• static contrast;
• color accuracy;
• color gamut of the monitor;
• pixel response time.

Maximum and minimum brightness

Before moving on to reviewing the test results, we emphasize that the characteristics declared for the LCD matrix itself (monitor) and the values ​​that can be measured are far from the same thing. Thus, the maximum and minimum brightness can be measured in different ways (for example, at different color temperatures and for different monitor profiles), and therefore, different values ​​can be obtained. Naturally, the indicators that are important for the user are those that he / she will receive with the working (that is, comfortable for work) monitor settings.

The GretagMacbeth Eye-One Pro spectrophotometer was used to measure the maximum and minimum brightness in combination with the basiCColor Display 4.1.9 software. The values ​​of the maximum and minimum brightness were recorded at the center point of the screen.

The monitor was originally calibrated and profiled at following settings basiCColor Display 4.1.9 software:

• calibration method - Software (the monitor does not support the function of editing the LUT-table (hardware calibration), therefore, it is only possible to edit the LUT-table of the video card (software calibration);
• Calibration Setup - Office:
  • white point - D65,
  • tonal range - 2.2,
  • glow - white maximum (120 cd / m2), black minimum;
• profile setting - LUT based:
  • profile type - 16-bit LUT,
  • chromatic adaptation - CAT02.

After calibrating and creating a profile using the basiCColor Display 4.1.9 software, the maximum and minimum brightness values ​​were measured using the white field at the center point of the screen.

When measuring the maximum brightness in the monitor settings, the contrast level and brightness level were set to 100%, and when measuring the minimum brightness, they were set to 0%.

According to the measurements, the maximum brightness range of the LG W2363D monitor at the center point of the screen is from 14 to 350 cd / m2.

Color accuracy

It should be noted that the color accuracy depends very much on the set brightness level, and on the monitor calibration, and on the created profile. Typically, several calibration procedures are performed and several monitor profiles are created, and then the profile that most closely matches the color reproduction is selected.

When determining color accuracy, the monitor was pre-calibrated and profiled in the same way as when determining maximum and minimum brightness. Note that the brightness level was set equal to 120 cd / m2. Then, using the basiCColor Display 4.1.9 program (already without calibration and profiling), the color accuracy was assessed by comparing the reference color template with the results of its measurement. Based on the comparison results, the value of the color difference DE 94 averaged over all color fields was determined. According to the measurements, it was 0.7 (Fig. 1), which is a very good result for a monitor that, in principle, is not intended for professional work with color. ... In general, when the D E 94 value is less than one, we can talk about very high color accuracy. In any case, it is simply impossible to notice the difference in color by eye when D E 94 is less than one. Well, the value of D E 94 averaged over all color fields, equal to 0.64, means that under normal conditions it is unrealistic to determine the deviation for most of the color fields by eye.

Rice. 1. Comparison of the reference template with the results of its measurements
to determine the color accuracy

Monitor color gamut

The color gamut of the monitor was determined using the ProfileMaker Pro 5.0.5 software package using a saved profile obtained during monitor calibration and profiling.

As it turned out (Fig. 2-5), the color gamut of the LG W2363D monitor is very close to the color gamut of a standard monitor with sRGB profile (although slightly different from it).

Rice. 2. Three-dimensional comparison of the color gamut of the monitor profile
with sRGB color gamut

Rice. 3. Two-dimensional comparison of color gamut of the monitor profile
with sRGB color gamut at L = 50

Rice. 4. 2D Gamut Mapping of Monitor Profile
with sRGB color gamut at L = 75

Rice. 5. Two-dimensional color gamut mapping of the monitor profile
with sRGB color gamut at L = 25

Pixel response time

A photosensor and a BORDO 211A digital oscilloscope were used to measure the pixel response time.

When measuring with special utility a horizontal line with a width of one pixel, the color of which could change in shades of gray, was turned on or off. By means of a photosensor and an oscilloscope, the time of the change in the pixel brightness was recorded.

The pixel response time measurement method is similar to the Gray-to-Gray (GTG) measurement method, but it does not completely repeat it, therefore the measurement results cannot be compared with the technical data provided in the documentation.

The pixel response time was measured on a monitor calibrated according to the above method. The level of brightness and contrast was set equal to the maximum value.

During testing, the transition time between the following halftone states (in RGB coordinates) of a pixel was measured: 0-0-0, 50-50-50, 100-100-100, 150-150-150, 200-200-200, 255-255 -255.

The transition time was understood as the time during which a pixel changes its brightness from 0 to 90% or from 100 to 10%.

After measuring all possible transitions between different halftones, the average value of the pixel response time was calculated. To calculate the average value, the geometric mean transition time between all semitones was calculated. The value calculated in this way is the pixel response time according to our measurement method.

It should be noted that measuring pixel response time on modern LCD monitors can be challenging due to the pulse width modulation of the backlights, which flicker at a high frequency (invisible to the eye). Due to the pulse-width modulation of the backlight lamps, the brightness of the monitor is adjusted, that is, by changing the flickering duty cycle of the backlight lamps, the average brightness level changes (the duty cycle is the ratio of the time the lamp is on to the total time the lamp is on and off).

In order for the measurement of the pixel response time to be possible, it is necessary to get rid of the flickering of the backlight lamps. That is why, when measuring the pixel response time, we set the maximum brightness of the monitor, at which the lamps do not flicker.

The results of measuring the transition time between different states of the pixel are shown in the table. The average pixel response time, calculated according to the method we described, was 4.2 ms. If we talk about the switching time of a pixel from black to white, then it is 4 ms, and the shutdown time is 1 ms.

conclusions

Summing up the testing of the LG W2363D model, we can say that this is a stylish, functional monitor with good characteristics... It can be used with equal success for work in traditional mode and for games in 3D mode.

Of course, main feature This monitor is compatible with NVIDIA 3D Vision technology.

It should be noted that today there are about 400 games with support for NVIDIA 3D Vision technology. There is simply no other content other than games in the 3D Vision format. That is, there are no films that can be viewed in 3D on a monitor with NVIDIA 3D Vision technology. Whether such films will ever appear is a big question, since it is hardly possible to say unequivocally that the future belongs to NVIDIA 3D Vision technology. For example, 3D monitors and TVs have already appeared that do not require the use of any glasses at all, and this technology may turn out to be much more promising.

However, time will tell which technology will become generally accepted. So far, only one thing is indisputable: the future belongs to 3D technologies and at the moment we are at the initial stage of their development. Moreover, NVIDIA 3D Vision technology is just one of them.

Note that this technology has both advantages and disadvantages. The advantages include high quality 3D images, but there is a whole list of disadvantages. Firstly, this technology requires the use of special glasses, and very uncomfortable ones. Secondly, you won't sit for a long time with these glasses - your eyes start to hurt. Thirdly, there is only a limited list of games that support this technology. Fourthly, this technology is tied to NVIDIA graphics cards and won't work with ATI video cards... In addition, when NVIDIA 3D Vision technology is used, the performance of the video subsystem is significantly (almost twice) reduced, that is, in games such an indicator as FPS (the number of frames per second) drops, and many games will slow down. Actually, the last circumstance requires that when using NVIDIA 3D Vision technology, a sufficiently powerful video card is used, which, naturally, increases the cost of the entire solution as a whole.

If, when choosing a monitor, you put at the forefront maximum speed, then you will have to realize one simple truth - you should not look at anything other than TN + Film models. Yes, they have their obvious drawbacks, but in general, not a single type of LCD panel can do without drawbacks. At the same time, there is an obvious advantage: such matrices not only allow increasing the vertical scanning frequency to 180-240 Hz, but also can demonstrate a high pixel response speed, without which the visual effect of the increased scanning frequency would not be so obvious.

In addition, for professional-level gaming, displays with a low working resolution are the best option, allowing you to reduce the load on the system and increase the stable level of frames per second. At the same time, you can choose any screen diagonal - according to your needs, but, probably, you should still look at models from 27 inches. Let us also recall the normal desire of every person to save money on a purchase - and as a result, our choice will be reduced to literally several available options that are on sale. One of them is the LG 27GK750F monitor. Let's take a closer look at it.

⇡ Background

The hero of today's review was announced in February 2018, and already in March it could be purchased at Russian stores at a price of 27,000 rubles. At the moment (June 2018), the minimum bar has dropped to 25,000 rubles, and the number of available competitors has remained at the level of two models - both from Acer. There is not much to choose from, as you understand, and if you set yourself the goal of buying the most advanced display in terms of technology and filling, then the LG 27GK750F is in the most advantageous position.

LG 27GK750F
Screen
Diagonal, inches	27
Aspect ratio	16:9
Matrix coating	Matt
Standard resolution, pix.	1920 × 1080
PPI	82
Image options
Matrix type	Borderless TN + Film
Backlight type	W-LED
Max. brightness, cd / m 2	400
Contrast is static	1000: 1
Number of displayed colors	16.7 million
Vertical frequency, Hz	30-240 Hz + AMD FreeSync Support
BtW response time, ms	ND
GtG response time, ms	2/1 (at 1 ms MBR mode)
Maximum viewing angles horizontal / vertical, °	170/160
Connectors
Video inputs	1 × DisplayPort 1.2a; 2 × HDMI 2.0
Video outputs	No
Additional ports and devices	1 × Audio-Out (3.5 mm); 2 × USB 3.0
Built-in speakers: number × power, W	No
Physical parameters
Adjusting the screen position	Tilt angle (from -5 to +23 degrees), installation height (0-110 mm), swivel (~ 20 degrees right-left)
VESA mount, dimensions (mm)	Yes, via the included adapter (100 × 100 mm)
Kensington lock mount	Yes
Power Supply	External
Max. power consumption in operation / standby (W)	30 / 0,3
dimensions (with stand), L × H × D, mm	625 × 466-576 × 272
dimensions (without stand), L × H × D, mm	625 × 370 × 40
Net weight (with stand), kg	6,35
Net weight (without stand), kg	4,6
Estimated price	25,000-28,000 rubles

LG Display did not have the fastest TN + Film matrices (at least they are unknown to the Internet), so the LG 27GK750F is most likely based on a TN + Film gaming matrix manufactured by AU Optronics, model M270HTN02 of an unknown version, created by specially for use in "frameless" monitors. This is an 8-bit (6-bit + FRC) panel with a resolution of 1920 × 1080 pixels (Full HD standard) and a native vertical scan rate of 240 Hz. The aspect ratio of the matrix is ​​usual - 16: 9, W-LED-backlighting without the use of SHI-modulation is used, providing a color gamut at the level of sRGB space. The monitor can be classified as a “bold pixel” solution, but those who buy such models, as a rule, know what they are doing for the sake of a high sweep frequency.

The declared maximum brightness of the monitor is 400 cd / m2, the static contrast ratio is 1000: 1, the viewing angles are 170 degrees in the horizontal and 160 degrees in the vertical plane. The response time, measured by the GtG method, corresponds to the class of the monitor - 1 ms, but only when the 1 ms MBR backlight mode is activated, without which the display response is declared at the level of 2 ms GtG.

AMD FreeSync adaptive sync technology, which operates in an unknown range and is not compatible with the aforementioned Motion Blur Reduction (MBR), has a positive effect on image stability. The latter is provided to allow you to achieve the same sensations as when working with a CRT display, due to the insertion of the so-called black frame. It can be activated at frequencies of 120, 144 and 240 Hz, after which it will no longer be possible to refer the monitor to Flicker-Free models.

The manufacturer has installed two new HDMI 2.0 ports and one DisplayPort 1.2a in the 27GK750F. To work with peripherals, there are 2 USB 3.0 ports and a 3.5 mm audio output for connecting headphones or an external speaker system, because there is no built-in monitor.

The design of the novelty in comparison with the appearance of its predecessors has been rethought, and not only the appearance, but also the appearance of the OSD menu has undergone changes.

LG 27GK750F is made in a classic, frame design, which, of course, is not so modern, but monitors with frames are better suited to work in difficult lighting conditions. The ergonomics of the stand allows you to change the angle and height of the monitor on the center column, as well as turn it left or right. Possible coup in portrait mode(Pivot). You can further expand the capabilities using a VESA mount and a bracket suitable for your parameters, which will have to be purchased separately.

⇡ Package contents and appearance

The LG 27GK750F monitor comes in a black and red box of a familiar design with high-quality printing. There is no carrying handle, there are only special cutouts on both sides.

The package contains several photos of the model from different angles and the inscription LG Gaming Monitor. The designers decided to get rid of unnecessary "tinsel".

Only on the upper edge of the package and on the side with the stickers is it written that this is a 240 Hz model with AMD FreeSync support, 1 ms MBR mode and Black Stabilizer function.

According to the main sticker, it becomes known that the copy that came to us was produced in China in December 2017 by LG itself.

The delivery set fully corresponds to the capabilities of the model, will suit the overwhelming majority of consumers and includes the following:

• power cable;
• external power supply;
• DisplayPort cable
• HDMI cable
• USB cable for connecting to a PC;
• plastic holder for cables and headphones;
• plastic holder for the mouse cable;
• user guide;
• warranty booklet;
• CD with software, drivers and instructions;
• a sheet listing the delivery kit (varies depending on the delivery version);
• sheet with additional information.

As we already said, LG 27GK750F is one of the few models where the developers have kept the frame design. It seems that they decided to leave the fancy RGB lighting system for the external space only for the 850th series, although the appearance of the rear of the models is identical. However, we understand everything perfectly well: the 27GK750F is not a top-level monitor, so here, well, it was impossible to do without saving on everything that could be saved at all.

Nevertheless, the monitor adopted from its older brothers a high-quality and stable stand in the form of a small tripod with a reduced angle between the two legs, which ultimately led to an increase in the depth of the entire structure. Now, all other things being equal, the distance between the user and the screen will be less, and this is not very good.

The central column has been changed, and thanks to this, the model has the ability to rotate the hull ~ 20 degrees to the right and left. In addition, there is a tilt angle adjustment in the range from -5 to +23 degrees and a height change of 110 mm.

Rotation to portrait mode is provided, and in both directions. Because of this, the centering of the case has not suffered much, there is almost no backlash. The only thing that disappoints in the ergonomics of the monitor is the minimum installation height: almost 10 centimeters remain from the bottom frame to the table!

The base of the stand is made of metal, on which there are three rubber feet. The upper part is made of ordinary matte plastic, without imitation of metal, but with red overlays - for the sake of beauty.

The cable routing system is a plastic element attached to the central column. Thanks to its shape, it plays the role of a headphone suspension - an integral attribute of all gaming monitors... But LG's designers went even further, offering players a "gimbal" for the mouse cable! In fact, it is a small plastic hook attached to the bottom edge of the case on the right side. I wonder what awaits us next?

The LG 27GK750F monitor is equipped with a TN + Film-matrix with a matte protective coating (you can hardly call it semi-matte, although you want to), which allows you to save the user from glare, but reduces the clarity of the picture due to the resulting crystalline effect.

You can additionally learn about the version of the monitor (REV00) by looking at the sticker on the body of the device. We have already got acquainted with all the rest of the information earlier.

All video interfaces are located at the rear of the case and are oriented towards the rear for easy connection. It also houses USB ports and a 3.5mm audio output.

The quality of the materials, the finishing of the edges and the painting of the model are all at a very good level. The joints of the elements are normal, the gaps are small and uniform. The case does not crunch or creak when applying adequate physical impact, but the structure is not very rigid - the model lends itself easily to twisting. In addition, we can note the poor fixing of the red overlays on the stand, as well as the use of the glossy frame around the perimeter of the case, which is rapidly losing its original gloss. The rest of the elements of the LG 27GK750F are highly practical and do not raise the slightest questions. Feel free to set the monitor to 4 on a five-point scale. We will not talk about design - it tastes and colors.

⇡ Menu and control

Controlling the monitor is supposed to be the same as in the case of most other modern LG models - using a five-way joystick located in the center of the lower edge of the device. It has a built-in not very bright power LED with a red glow, which can be turned on (by default it is deactivated) if necessary.

There are no complaints about the convenience of control, the menu responsiveness is high, the processing of pressing the joystick is almost instantaneous. With any initial action of the joystick, a menu of five items appears on the LG 27GK750F screen.

Among the possibilities with quick access What it offers is to turn off the monitor, go to source selection, turn on the game submenu (for easy selection of a preset mode) and hide the OSD from the screen. You can also quickly change the volume level when connecting external speakers or headphones.

The appearance of the menu of LG gaming monitors at the end of 2017 - beginning of 2018 has changed significantly, and, from our point of view, for the better. Now the OSD menu does not occupy one quarter of the entire screen area, it looks much more modern, albeit less strict. The design began to resemble some of the solutions of competitors, but there is nothing wrong with such borrowing.

The number of red elements has significantly increased, the upper information strip with the main game "chips" has been added. The number of sections has been reduced, the logic of building the menu has changed. It has become easier - and for the average consumer this is only a plus.

Due to the default Russian localization of the menu, some names sound rather strange, but with an understanding of what is at stake, there are no problems. The first section contains only preset modes. The user is prompted to simply select one of them.

The "Game Settings" section contains options that will primarily interest an advanced gamer. Here you can activate the black frame insertion system or AMD FreeSync adaptive synchronization technology, adjust the visibility of shadows and the degree of panel overclocking, as well as enable one of the four types of on-screen sight, in case it is not in the game, but you still want to win. However, this is rather cheating.

All the basic adjustments affecting the color rendering of the image are placed in the section "Adjusting the picture". Here we are greeted by a classic set of settings: brightness, contrast, sharpness, gamma and color temperature modes, as well as manual adjustment of RGB gain and black level (only for HDMI connection). There is also the possibility of activating the Dynamic Contrast Ratio System (DFC), which LG describes as “ Automatic adjustment screen brightness ”, which is generally not far from the truth.

The last section, "General", offers to turn off the power LED, select the menu localization language, turn off the energy-saving Smart Energy function, activate the automatic sleep mode in case of long inactivity (4, 6 or 8 hours), USB fast charging and DP 1.2 mode , lock the menu and reset all settings to factory defaults. A special subsection presents the main working information on the monitor, including operating time.

Access to service menu in the case of the hero, the review was not found, as in most monitors of the company.

⇡ Testing methodology

The LG 27GK750F monitor was tested using an updated methodology using the X-Rite i1 Display Pro colorimeter in combination with the X-Rite i1 Pro reference spectrophotometer, the Argyll CMS c software package graphical interface dispcalGUI and HCFR Colormeter. All operations were carried out in Windows 10, during testing, the screen refresh rate was 240 Hz.

In accordance with the methodology, we will measure the following monitor parameters:

• brightness of white, brightness of black, contrast ratio at backlight power from 0 to 100% in 10% steps;
• color gamut;
• color temperature;
• gamma curves of three primary RGB colors;
• gray gamma curve;
• color deviation DeltaE (according to the CIEDE1994 standard);
• uniformity of illumination, uniformity of color temperature (in kelvin and units of deviation DeltaE) with a brightness in the central point of 100 cd / m 2.

All measurements described above were performed before and after calibration. During our tests, we measure the main monitor profiles: default, sRGB (if available) and Adobe RGB (if available). Calibration is carried out in the default profile, with the exception of special cases, which will be discussed further. For monitors with wide color gamut, we select sRGB hardware emulation if available. Before starting all tests, the monitor warms up for 3-4 hours, and all its settings are reset to factory settings.

We will also continue our old practice of publishing calibration profiles for the monitors we tested at the end of the article. At the same time, the 3DNews test laboratory warns that such a profile will not be able to 100% correct the shortcomings of your particular monitor. The fact is that all monitors (even within the same model) will necessarily differ from each other by small color errors. It is physically impossible to make two identical matrices, so a colorimeter or spectrophotometer is required for any serious monitor calibration. But even a "universal" profile created for a specific instance can generally improve the situation with other devices of the same model, especially in the case of cheap displays with pronounced color rendering defects.

⇡ Operating parameters

The manufacturer offers six preset modes in the LG 27GK750F monitor. When testing the monitor, we used the Display Port 1.2a interface as it maximizes all the advantages of the model and does not require additional dynamic range settings (unlike HDMI).

By default, the settings for the main parameters looked like this:

• mode - player 1;
• brightness - 100;
• contrast - 70;
• Smart Energy Saving - min;
• pace. colors - user (50/50/50);
• response time - fast;
• black stabilizer - 50;
• gamma - mode 2.

During manual setting(100 cd / m2 and 6500 kelvin) they took the following form:

• mode - player 1;
• brightness - 14;
• contrast - 50;
• Smart Energy Saving - off;
• pace. colors - user (45/49/50);
• response time is normal;
• black stabilizer - 50;
• gamma - mode 2.

The factory settings are very far from ideal - the picture on the screen is whitened, the contrast is too high, the extreme light areas merge together. Therefore, in the course of manual adjustment, we needed not only adjustments to brightness and color temperature, but also changes to the contrast value. In addition, we deactivated the power saving system and reduced the panel overclocking, but the "Gamma" mode remained at the default settings.

⇡ White brightness , brightness of black , contrast ratio

The initial check was carried out at the factory settings of the monitor.

Brightness in the menu (%)	Brightness of white (cd / m2)	Black brightness (cd / m2)
100	434	0,45	964
90	404	0,42	962
80	376	0,391	962
70	347	0,361	961
60	317	0,331	958
50	288	0,3	960
40	258	0,269	959
30	227	0,237	958
20	197	0,205	961
10	165	0,173	954
0	137	0,144	951

The maximum brightness in this case turned out to be higher than the one declared in TX and amounted to 434 cd / m2, but the minimum value could not fall below 137 cd / m2 - this is too much, especially when working in a dimly lit room.

After reducing the contrast to 50% to improve color reproduction, the minimum brightness drops to 76 nits at a contrast ratio of 530: 1 versus ~ 960: 1 at default settings. From our point of view, this is a better option for long-term work and games, even despite the drop in the depth of the black field - you will hardly notice it.

Pulse width (%)	Brightness of white (cd / m2)	Black brightness (cd / m2)	Static contrast (x: 1)
100	242	0,258	938
90	231	0,241	959
80	215	0,227	947
70	197	0,209	943
60	182	0,193	943
50	166	0,176	943
40	153	0,16	956
30	136	0,143	951
20	120	0,125	960
10	102	0,107	953
0	83	0,089	933

After activating the 1 ms MBR mode, the operating brightness range changes significantly. The minimum drops to 83 cd / m2 at standard contrast settings (and to 47 nits at 50% contrast), and the maximum drops to 242 cd / m2, while maintaining the original contrast ratio. This working range is much better suited to a wide variety of ambient lighting conditions. However, the load on the eyes in this mode is higher due to SHI modulation with a large duty cycle at the frequency, equal frequency vertical sweep (optional: 120, 144 or 240 Hz).

Results with standard settings

The color gamut triangle of the LG monitor is noticeably shifted relative to the sRGB standard and with great accuracy repeats the possibilities previously. The pivot points are located in such a way that the lack of pure saturated stimuli can be felt when working with blue, turquoise and green colors. The means of getting rid of shades outside the triangle is to use ICM / ICC profiles and software products with support for color management system (CMS).

At factory settings, the monitor has a gamut of 91.5% sRGB and 64.4% AdobeRGB. The result is good, for those who like to play will go. But working with color, especially taking into account other features of TN + Film-models (banding [banding], low picture stability), is out of the question.

The white point is set at an average level, which cannot be said about the stability of the gray wedge - all the shades have parted in different directions, and this negatively affects the impression of the picture on the screen.

On the gamma curves, we can note two that stand out against the general background. color channel, due to which the picture on the screen has become more contrasting than it should be.

In addition to the RGB imbalance, it is worth noting the killed extreme light shades (highlights). This feature cannot be seen on standard gamma curves, but we decided to confirm it using a separate test consisting of 20 light shades. You can see how half of them go into oversaturation, and only adjusting the contrast level saves from this. By the way, this is the very rare case when this parameter is really worth changing! In 99% of monitors, it is set adequately already from the factory.

The monitor passed the color accuracy test with an average result, but solely for the reason that there are not so many test shades in it. If there were more of them, the results would be much lower. And if you think that such a factory setting will beautify the games and please the unassuming user, then we will disappoint you - even during normal operation it is annoying.

⇡ Results after calibration

As you already understood, you cannot do without setting up the LG 27GK750F monitor. In the absence of measuring instruments it will be enough to reduce the contrast value to 50-55% and adjust the brightness. Without activating 1 ms MBR, you can safely set it to 10-15% of the maximum.

We also adjusted the RGB Gain values ​​to bring the white point to ~ 6500 Kelvin. After the performed manipulations, the color correspondence between sRGB and AdobeRGB decreased by ~ 1%, which will be imperceptible in real work.

Immediately after calibration, the gamma curves were close to ideal, but the above is an example of what happened to them (with the applied profile with LUT edits) after half an hour.

Yes, we managed to overcome all the problems associated with the distinguishability of extreme light areas, improve the visibility of shadows, but in general, the monitor does not have high color stability, and therefore the final result did not please us at all.

⇡ Results in 1 ms MBR mode

We could not ignore testing the monitor in a mode called 1 ms MBR, which switches the backlight to a strobe mode with a high duty cycle, that is, with “black frame insertion”. This is a rare feature for fast AMD FreeSync-enabled monitors. As a rule, only models with NVIDIA G-Sync are equipped with a similar mode, but even among them there are exceptions.

After activating Motion Blur Reduction, the nominal brightness is almost halved, and the color match is almost identical to the results obtained with the factory settings.

White point and grayscale CG stability remain in place. Simply put, it's just as bad.

The same problems remain on the gamma curves, and a person who wants to see a more or less decent picture on the screen cannot do without adjusting the "Contrast" parameter.

The monitor's floating color rendition and slightly changed operating parameters ultimately affected color accuracy. In the Argyll CMS test, the LG monitor averaged 2.94 DeltaE94 units and 6.04 at its maximum.

⇡ Results in "Reading" mode

Let us consider separately the "Reading" mode, which stands out from the general list of game presets - it should reduce the load on the user's eyes during long-term work at the monitor in low ambient light conditions.

The contrast ratio is reduced to 80: 1, the brightness is immediately set to 0%, all other settings related to color reproduction are blocked. The grayscale color temperature stability is improved over other modes, but the overall experience is not affected in any way.

The gamma curves show a sharp decrease in the contrast of the picture and an even more obvious gap in the distinguishability of the extreme light areas. But in this case everything is just “wonderful” with the distinguishability of shadows - it is superfluous. However, this is the idea of ​​the "Reading" mode - to reduce the strain on the eyes. The manufacturer has definitely achieved this, but whether the user will like the picture on the screen is a big question.

You just need to look at the Argyll CMS benchmark results in order not to want to enable this mode. No comments, only emotions ...

Backlight uniformity

The uniformity of the display backlighting was checked after lowering the brightness at the center point of the monitor to a level of 100 cd / m2 and a color temperature of ~ 6500 Kelvin. The illumination unevenness compensation system is not used in the model under study, which was quite expected. Let's also recall the floating color rendering of the LG 27GK750F, which, quite possibly, slightly affected the test results. Please understand this.

The picture above shows a photo of a white field with a certain exposure adjustment during shooting (in the dark) and further software processing for a more visual representation of the uniformity of the backlight. From it you can immediately understand that our specimen has certain problems with the uniformity of illumination in a bright field, but they are distributed more or less evenly along the entire contour of the matrix, as is often the case with gaming TN + Film solutions.

The average deviation from the center point was only 7.5%, and the maximum deviation was 25%. The result is quite impressive, but the monitor would have surprised us even more if there was no blackout in the lower right corner. Then, in terms of uniformity of brightness on a white field, he would take one of the prizes in his class.

The maximum brightness is stable only at the center point of the screen. The further away from it, the more obvious the problem of uniformity of the backlight. Especially our specimen had no luck with the upper left corner.

Color temperature uniformity is no worse than brightness. The average deviation was 1%, the maximum was 4.1%, and the difference between the minimum and maximum after tuning was slightly over 400 Kelvin. The result is worse than that of the more expensive rival Acer, but the reason for this is the same bottom-right corner of the panel.

The surface plot with color temperature deviations expressed in DeltaE units confirms the above: the maximum deviation is only 3.8 units, and the average is 2.1. For a game model, the result is more than decent, although it can be seen that the farther from the center, the higher the deviations - such are they, TN + Film-models.

Now let's look at the uniformity of the backlight and the various color effects in the case of the black field. We will do this based on two photographs taken on different distance from the screen (~ 70 and 150 cm).

When moving away from the screen, Glow completely disappears, but the irregularity of the backlight becomes visible in the form of some slightly more lightened and darkened areas. The phenomenon is not the rarest, and sometimes it really manifests itself on game models. Most likely, all samples of LG 27GK750F demonstrate something similar.

⇡ Gradient quality and responsiveness

The LG 27GK750F, according to the manufacturer, uses an 8-bit matrix (most likely using the FRC method), which provides good quality gradients with default settings and after manual edits (the first example above). But we did not succeed in clearly reflecting all this in the photo - the viewing angles do not allow. The gradient is actually horizontal, but in the photo it looks like a diagonal circular.

The monitor uses a modern TN + Film-matrix with a native refresh rate of 240 Hz (with the word "native" we mean that no additional overclocking is required through the monitor settings). Full HD resolution makes it much easier to achieve high and stable frame rates than WQHD and UWQHD solutions. However, even if you have powerful gaming components in your PC, you should definitely not rely on 200-240 frames per second in any game at high graphics settings. Perhaps the achievement of such indicators is the exception rather than the rule. And lowering the graphics settings will not always save the situation: sometimes the developers impose restrictions on the maximum FPS - and there’s nowhere to go.

That is why we will not start a discussion about the necessity and practicality of such a high vertical frequency. We can only note the fact that when changing from a 60-Hz monitor to a 120-144-Hz model, the difference catches the eye of any user when performing any task, but when replacing a monitor with a 120-144 Hz scan with a modern model with a maximum refresh rate of 165 , 180 or 240 Hz it will be difficult to feel the difference, and for some it is even impossible.

Speaking about the hero of the review, we can note the high quality of OverDrive factory overclocking. There are no clearly distinguishable artifacts during real work at the monitor, and the loops are minimal. There is no fundamental difference between the OD modes - we chose "Normal", but the "Fast" set initially was also good. Perhaps, it is worth giving up only the latter, called "Faster".

Despite the initially high matrix speed and similarity to 240-Hz 24.5-inch solutions, the LG 27GK750F model, like the similar Acer Predator XB272bmiprzx, but with the G-Sync module on board, lags behind them a little. This leads to the fact that activation of the ULMB backlight mode makes more sense - moving objects really become as clear as possible, the perception of what is happening on the screen is significantly improved. Feels like working with a fast CRT display.

Separately, we note that the use of AMD FreeSync technology, which works, albeit in an unknown frequency range (most likely, it is 48-75 Hz) and allows you to achieve the absence of microlags and picture tears at a very floating FPS level, implies the need to disable the 1 ms MBR mode. Only one thing can be used.

The absence of frame skipping at a frequency of 240 Hz was confirmed by a special test from the UFOTest package. With this, the monitor, like a real gaming model, has no problems.

⇡ Viewing Angles and Glow - the effect

Viewing angles are one of the main problems with TN + Film displays, and this also applies to the hero of the material, despite the relative novelty of the matrix. If you have come across TN + Film matrices for the last 5-7 years, then there will be no revelations for you. Just before buying, you need to be aware of why this monitor is being purchased and what obvious disadvantages (due to the technology of the matrix itself) it has.

The stability of the picture in different parts of the screen is low, the color shift is clearly visible, and if the user moves relative to the monitor, then even more so. In some cases, such as when working with spreadsheets and documents, you can clearly see the differences between the bottom and top of the screen. And if you leave the monitor settings at their default values, then the impression of the viewing angles will be even worse for you.

But all this is not such a problem if only the speed of the matrix is ​​important for the buyer, or if he has not worked with monitors with other types of panels until now. However, once you get acquainted with IPS and even * VA matrices, you begin to pay attention to this.

⇡ Crystal effect , Cross-hatching , PWM

The monitor LG 27GK750F uses a high-quality matte surface of the matrix with good anti-reflective properties.

The approach is not the most modern, however, even with such a surface, the manufacturer has achieved quite good result- the crystal effect on the screen of the new LG is not striking, the picture does not ripple (there is no "sand"), when you change the viewing angle, the FE is practically not enhanced. The Cross Hatching effect did not affect the studied display model either.

Due to the principle of the technology, flickering backlighting is indispensable here. Its presence is also confirmed by tests: setting the vertical sweep to 240 Hz, during the measurements, we got a flicker of the screen backlight at exactly the same frequency. Eye strain is higher than without MBR, but the visual perception of moving objects on the screen, even with normal scrolling of Internet pages and work documents, is noticeably different. In which mode to use the monitor is up to you. It is fast in both modes.

⇡ Conclusions

The LG 27GK750F tested monitor is designed for those who value speed - and only it. This is a monitor for hardcore gamers - people with absolutely no interest in color accuracy, who will not be annoyed by the negative aspects of the TN + Film matrix. There are plenty of such buyers, and we are sure that the new LG model will not get dusty in store warehouses, especially given its adequate cost.

Now, for many, esports and tournament victories are becoming exactly the same profession and earning a living as any hobby for photography, video and graphics, where the requirements for a working display are completely different. And for these purposes, many of the shortcomings are quietly covered by the advantages of the model. In its new product, LG has eliminated some of the shortcomings of the previous series and made the 27GK750F fully consistent with all the needs of the main target audience.

At the same time, the display will definitely not become a universal tool for everything and everyone. Non-professional gamers can perhaps opt for this as a second device for frequent evening tournaments. If you are interested in the 27-inch Full HD version, then you will not have to think for a long time. On the market there is one problematic Acer with a frame drop at 240 Hz, another representative of this manufacturer with a stand without the possibility of transformation, a BenQ monitor without any adaptive sync system and almost twice as expensive Acer Predator with G-Sync. Our today's experimental is in this "zoo", as you know, the golden mean.

From the file server, the site can be used for this monitor, which we received after the hardware calibration procedure.

Disadvantages:

May not suit:

• features inherent in the TN + Film-type matrix (low image stability, strong color shift and poor viewing angles).
• the minimum distance of the lower frame of the case to the table is about 10 cm - rather high installation of the case on a stand;
• lack of a built-in speaker system;
• floating color rendering (for true connoisseurs of this class of monitors, this is an insignificant problem);
• the visibility of the crystalline effect is reduced, but the picture is still more pleasant for models with a semi-matte finish;
• Bold pixel;
• insignificant increase in speed (of course, not for everyone) against the background of high-quality 144-180-Hz models released earlier and at a lower price;
• strong Glow-effect on a black field - TN + Film can't do it any other way.

The classic version of a portable heart rate monitor. It consists of a chest-mounted transducer with an elastic strap and a watch-like receiver located on the wrist.

This device is irreplaceable:

For professional athletes and amateur athletes who want to train with maximum performance

For everyone who wants to lose weight

For people with heart disease

The chest strap heart rate monitor is commonly used in cycling sports such as running, cycling, swimming, and cross-country skiing.

The main advantage of a chest strap is its accuracy. It qualitatively measures your heart rate in any situation - whether you are at rest, engaged in light physical work, or actively involved in sports.

The second important plus of the device with a chest strap is that you do not need to take any additional steps to measure the pulse: the heart rate is always displayed on the receiver screen.

The DFC W117 uses analog data transmission and monitors 3 possible heart rate zones.

Additional features of the wrist monitor:

Time / Date / Alarm

Calories Burned Calculator

Configurable upper and lower heart rate limit with audible alert

Maximum, average and% of maximum heart rate

Chronograph

Illumination of indications of the monitor