Monitor Asus PG248Q part of a series of Asus products, United by a common brand “Republic of Gamers” (abbreviated to CPU). Accordingly, the full name of the model looks like a ROG Swift PG248Q. The monitor is based on the matrix TN resolution of Full HD with a diagonal of 24 inches, can operate at a refresh rate of 180(!) Hz, also features support for technology Nvidia G-Sync, 3D Vision 2, and ULMB.
The design is a combination of “professional” utilitarian with a number of designer finds. External monitor dashboard is made of dark grey (almost black) matte plastic, mostly smooth, but sometimes with texture and geometric pattern, and two small plane on the back panels have a mirror-smooth surface. The outer surface of the matrix is black, semi-Matt, hard.
The front frame is narrow, flat, steel with matte black coating. Bottom right on the vertical part of the front frame icons printed on the buttons, and the buttons located on the rear panel, opposite the markings. The top button is a 5-way joystick, and other buttons that are concave, then convex edge.
Overall ergonomic, and the label is seen and the buttons are easily located even in the dark, and when you click on them the screen adheres to the fingers (large front, index at the rear presses the button), so the Asus PG248Q monitor is not shaking. Also in the bottom right corner is on the bottom block of the screen is a status indicator visible from the front. All interface connectors and the power connector located in a recess on the rear panel and is oriented conventionally down. Connect the cables to the monitor Asus PG248Q is quite convenient, especially when you flip the screen unit in a portrait orientation. Also on the rear panel you can find the connector for the Kensington lock.
Ventilation grids located on the sloping faces on the rear panel. Standard stand allows the screen unit slightly tilted forward, reject, back, lift, turn in a portrait orientation in a clockwise direction and turning left and right.
On the bottom of the round part of the rack marked proprietary marks of the angle of rotation, and in order you do not forget the ability to stand on the top of the rack caused a reminder. The base of the stand is relatively large in area, but it’s flat (though with slightly sloping sides), which increases the efficiency of the working area of the table. The monitor Asus PG248Q is the stand is very stable. The stand design hard. From below its foundations reinforced cast aluminum alloy plate, and all the supporting elements are metal (steel/aluminum).The attachment of the monitor unit is moved on the rack up/down on steel ball bearing guides. At the bottom of the base of the stand on the perimeter of the glued rubber pads protect the table surface from scratches and prevent sliding of monitor on smooth surfaces.
The cables running from the display connectors, you can skip through the cutout in the bottom of the rack. If necessary, the stand can be detached and to fix the screen unit to a VESA-compatible bracket (area 100 by 100 mm). We will mention two more items that have more decorative logos on the front and rear based on the above, confirming belonging to the club “Republic of Gamers”. In addition, red illuminated ring around the strut at the base of the stand. For sale monitor Asus PG248Q in a large colourful box with plastic handle on top, which is useful when transporting one person. We went to a very tattered, so will not show.
Video inputs or two HDMI (version 1.4) and DisplayPort. Of these, only the DisplayPort input supports input signal with the maximum for this monitor Asus PG248Q resolution and frame rate, and it only supports Nvidia G-Sync. Inputs are selected in the menu automatically select the active input, apparently not.
HDMI and DisplayPort inputs capable of accepting digital audio (PCM stereo only) that are output after conversion to analog form via a socket minijack 3.5 mm To analog audio output you can connect an external active speaker system or headphones. Power headphone output was enough to 32-Ohm headphones with a sensitivity of 112 dB, the volume was sufficient, but no stock. The sound quality is good headphones — the sound is somewhat sharp, but there is a wide range of frequencies and in the pauses of the noise is not audible. The monitor Asus PG248Q has a built-in USB hub (3.0) with one input and two outputs. The power supply is external. Plug and voltage can approach and universal PSU for laptops.
Status led a little brighter than I would like, it is noticeably flickers and its white light is clearly decomposed into a rainbow when rapid eye movement. It glows white when the monitor is orange in standby and is not lit when the monitor is off probation. When the monitor mode Nvidia G-Sync indicator is red, and if enabled, the ULMB or 3D Vision green. To disable the indicator it is impossible. Ring based on less functional — it just glows red when the monitor and flashes slowly in standby mode. The backlight is already possible to disconnect, get to the menu item with the strange name of the Light. Menu navigation is relatively easy, and further convenience is enhanced by the joystick. If the monitor Asus PG248Q works, and the screen no menu, first press (deflection ignored) on the joystick displays the main menu.
And when you click on the button with a cross appears only a short menu of icons or pop-up in front of the buttons. The clues tell us: joystick — menu entry and manipulate it, the button below is the exit from an item/menu/cancel mode, below — call button features GamePlus, and below that button GameVisual — select picture modes. For the bottom-most button icon on the screen does not fit, but the icon on the frame we can see that the power button. The buttons you can lock the menu. To cancel the key lock, press the button with a cross and hold it for at least 5 seconds. The main menu is great. The text in the menu is relatively small, but its absolute size provide an acceptable readability. When you adjust the image menu remains on the screen, which slightly interferes with the assessment made adjustments. Customizable background transparency, menu position on the screen and delay the automatic exit from the menu.
The additional features in the set GamePlus there are four “gaming” features: scope the selected form in the selected location on the screen, the countdown timer from fixed values, the frame-rate counter and labels for alignment arranged end to end monitors.
Settings are not very many, there are brightness, contrast and saturation and also choose a color profile from three preset or custom in which color balance can be corrected by adjustments in the intensity of the three primary colors.
If a separate setting governing the intensity of the blue component. The picture also depends on the selected profile in the list GameVisual.
Theatrical modes of operation were tested when connected to a Blu-ray player Sony BDP-S300. Was tested by HDMI. The monitor Asus PG248Q accepts signals 576i/p, 480i/p, 720p, 1080i and 1080p at 50 and 60 fps. 1080p at 24 fps is not supported. In the case of interlace signals, the image simply appears in the fields. Subtle gradations of shades in different lights and shadows. Brightness and color clarity is very high, and only determined by the video signal type. The interpolation of the low resolution and Full HD to the resolution of the matrix is performed without significant artifacts.
“Crystalline” effect is so weak that it can recognize its absence. The matte surface of the matrix allows you to work comfortably in a typical embodiment, the location monitor of the user and the lamps in the room.
A clear picture of the structure of the pixels due to the Matt surface cannot be obtained — however, in the case of TN no structure and should not be:
Focus on the screen surface showed randomly distributed microdefects of the surface that meets itself in the matte properties:
The grain of these defects is several times smaller than the sub, so focus on the microdefects and “jump” focus on the sub when you change the angle of view is weak, because of this, there is no “crystal” effect.
To assess the nature of the growth of brightness in gray scale we measured the brightness of 256 shades of gray (0, 0, 0 to 255, 255, 255) when selecting the profile of the Race, which, from our point of view, the image is optimal for this monitor Asus PG248Q (the parameter Gamma equal to 2.2). The graph below shows the increase (not the absolute value!) brightness between adjacent tones:
It is evident that not everyone is following the tone significantly brighter than the previous one. In the shadows no problem different all the shades that in the case of the monitor Asus PG248Q playing particularly well, even starting with the first color after black:
To further enhance the visibility of colors in the shadows will help the function of Strengthening the dark, which, however, does not change the black level, i.e. does not reduce the contrast of the image. The approximation of the gamma curve gave the rate of 2.31, slightly above the standard value of 2.2. Thus approximating the power function deviates little from the actual gamma curve:
However, the variances of the coordinates of the primary colors from vertices sRGB is quite small, so visually the colors on this monitor have a natural saturation. Below are the spectrum for the white field (white line) superimposed on spectra of red, green and blue fields (lines of corresponding colors).
This spectrum with a relatively narrow blue peak and a broad hump of green and red colors are characteristic monitors that use white led light with a blue emitter and yellow phosphor.
Color reproduction even when choosing the best of the preset options (and it was a Racing mode in the source view) is somewhat different from the standard, so we tried to manually correct the color by adjusting the gain of the three primary colors. The graphs below show the color temperature in different parts of the gray scale and the deviation from the spectrum of a blackbody (setting ΔE) in the case of profile Racing mode and after manual correction:
The closest to the black band can not be ignored, as it’s color rendition is not as important as the measurement error of the color characteristics is high. Manual correction slightly improved color reproduction, at least, the white point moved even closer to the standard 6500 K, and ΔE decreased significantly. Note that for the gaming use case, the color quality will be more than sufficient in option out of the box.
Measurement of the uniformity of the black and white fields, brightness and energy consumption
Brightness measurements were conducted at 25 points of the screen are located with a step of 1/6 of the width and height of the screen (the screen is not enabled, the settings of the monitor set to the values for maximum brightness and contrast). The contrast was calculated as the ratio of the brightness fields in the measured points.
|Option||Secondary||The deviation from the average|
|min., %||max., %|
|The brightness of the black field||0.35 CD/m2||-10||9,6|
|The brightness of a white field||335 CD/m2||-7,7||6,7|
The uniformity of all three values is very good. The contrast for this type of matrices are normal. Visually a black field uniform in the whole area of the screen. The photo below it shows:
The brightness of a white field in the center of the screen and consumed from the network power (the other settings are set to the values providing the maximum brightness of the image):
|Setting value of Brightness||Brightness, CD/m2||Electricity consumption, W|
In standby mode (with illuminated ring) monitor consumes 0,40-1.1 W in the conditional off — 0.3 W, but only BP — 0.1 watts.
The monitor Asus PG248Q brightness changing the brightness of the backlight without compromising the picture quality (contrast is maintained and the number of distinguishable shades of gray). The minimum level of brightness high, that when using the monitor Asus PG248Q in total darkness can be a little uncomfortable. At any level of brightness modulation of the backlight is absent, which eliminates visible flicker of the screen. In this section it is appropriate to mention another mode.
This is Nvidia’s Ultra Low Motion Blur (or ULMB) — sometimes referred to as an inset black frame. In this case, the backlight switches to pulse mode with maximum brightness above 100% in normal mode and variable pulse width — the lower the setting value of the ULMB, the narrower the pulse. The picture on the monitor flickers noticeably, but also the dynamic sharpness increases slightly. The final utility may specify.
The graph below the vertical axis is brightness, the horizontal — time and lines of different colors indicated the dependence of brightness on time for three values of brightness in normal mode (left half of graph), and for two values ULMBand also for mode 3D Vision (toggle with a black perspective on white) in the right half.
In the mode of 3D Vision the brightness for the angle pulse is increased, partially offsetting the drop in brightness when viewing active shutter glasses with retaining good separation. Subjective evaluation showed that the separation angles are good for black objects on a white background and white on black is a great option for a light gray object on dark grey background. The total drop of the brightness is large, but still stereoscopic image is comfortable to watch even in a lit room. Note that in the latest series of graphics cards with the Nvidia GPU, e.g. GeForce GTX 1070, 3D Vision as it turned out , not supported.
The heating of the monitor Asus PG248Q can evaluate at the given pictures with the IR camera, obtained after long-term operation of the monitor at maximum brightness in ambient temperature of approximately 24 °C:
The rear panel is heated to 34 °C (maximum), while the upper edge of the screen is heated to 37 °C (apparently the top and bottom are the led line illumination of the screen). The cooling efficiency is high, the manufacturer notes that one of the advantages of the monitor Asus PG248Q. The surface of the PSU heated up to 42 °C (maximum).
The response time depends on the setting OD (probably from Over Drive), which controls the acceleration of the matrix. When Off. no overclocking, when the Normal acceleration is average, when Extremeacceleration is maximum. The graph below shows how changing the time on and off during the transition black-white-black (bars on. and off), as well as the average total time for the transitions between tones (columns GTG):
When the values of ODthan from Off, the graphs of some typical transitions appear in bursts of brightness, for example, so do the graphs look for the transition between shades 40% and 60% (values of OD are given above the graphs):
Visually even in the case of Extreme artifacts are visible only when combining certain tones of the background and moving objects.
In order for the monitor to be able to work in a mode with a refresh rate of 180 Hz, in its settings you need to enable Over Clocking. Of course, we need a graphics card that supports this mode. The manufacturer indicates: “screen refresh rate of 180 Hz with a resolution of 1920×1080 is supported only by Nvidia GeForce GTX 650 Ti Boost and above.” We are lucky in the warehouse found a graphics card with GeForce GTX 1070on Board, which we borrowed to test this monitor.
We have determined the complete reaction time from switching the page of the video buffer to the start of the image displayed on the screen. If this total does not include unknown fixed delay from request for switching the page of the video buffer prior to running the ADC with an external photosensor mounted in the center of the screen of the monitor and a constant/variable delay, due to the fact that Windows is not a real time system with a normalized delay and the peculiarities of the graphics card, its driver and Microsoft DirectX.That is, we obtain the delay bound to a specific hardware configuration. In the end, the average delay of image display when connected via DisplayPort and in the mode of 1920×1080 at 180 Hz frame rate was only3,8 MS with a disabled vertical sync frequency. Enable synchronization vertical frequency led to an increase in average latency to 7,3 MS. In any case, such delays are not felt as in the dynamic games.
Next, we tested the implementation in a given technology monitor G-Sync. Outset what gaming tests we not carried out because of lack of experience in this field and due to the great influence of the subjective factor.We have used a demo program Nvidia G-Sync Pendulum Demo. The program demonstrates the swinging pendulum which in one rendered frame is moved by a fixed angle, but with variable acceleration (imitation of a real pendulum), the frequency of drawing is constantly changing. Three switches at the top left allow you to change the output mode. Visual testing has shown that if you enable VSync the image of the pendulum unpleasant twitching, with VSync off, motion smoother, but the picture is all torn, and only in the mode of G-Sync everything is perfect — smooth motion, no breaks.The result is expected, and has been repeatedly reproduced in our tests.
The delay output mode, G-Sync, unfortunately, not identified, as the current combination of Windows 7 and the Nvidia drivers were incompatible with our software and hardware systems to determine the output timing.
To find out how to change the screen brightness with deviation from the perpendicular to the screen, we conducted a series of measurements of brightness of black, white and shades of grey in the center of the screen in a wide range of angles by deflecting the axis of the sensor in vertical and horizontal directions. Diagonal direction in the case of TN-matrices is not interesting, so we skipped this test.
Decreases the brightness by 50% of the maximum value:
Note the smooth decrease of brightness with deviation from the perpendicular to the screen in the horizontal direction, thus the graphs do not overlap in the whole range of measured angles. When you deviate down the dark shades are inverted, when you reject light up are inverted. The contrast in the range of angles of ±82° falls below the mark of 10:1 at a deviation down more than 77°.
To quantify the change of color, we conducted colorimetric measurement of white, gray (127, 127, 127), red, green and blue, light red, light green and light blue fields in the whole screen using a setup similar to that used in the previous test. The measurements were carried out in the range of angles from 0° (the transducer is aimed perpendicular to the screen) to 80° with 5° step. The obtained values of intensities have been calculated in ΔE relative to the measurement of each field in the perpendicular position of the sensor relative to the screen.The results are presented below:
As a reference point, you can choose a deviation of 45°, which may be relevant in the case of, for example, if the image on the screen considering two people at the same time. The criterion of proper colors can be considered the value of ΔE less than 3.
The graph shows that only the deflection up at least the basic colors do not change much in the shade. In General, a significant shift of the majority of the shades, along with invert brightness of tones, a characteristic feature of the TN matrix.
Design and functional equipment monitor Asus PG248Q typical of most modern gaming monitors this company. The monitor selects a very high refresh rate, reaching up to 180 Hz. Will be accompanied by the increase in the rate against typical gaming monitor 120-144 Hz increase performance in games, we do not know, but the monitor in any case remain good ergonomics, with the support of technology Nvidia G-Sync, providing smooth dynamic image without gaps and with a low latency output, and more.