The front surface ViewSonic VP2468 looks like a monolithic black matte surface (the specularity is poorly expressed), bounded around the perimeter by a narrow edging made of plastic. Having displayed the image on the screen, you can see that in fact between the outer boundaries of the screen and the actual display area there are fields from above and from the sides with a width of about 5-6 mm and 9.5 mm from the bottom. We liked the design of ViewSonic VP2468, it seems to be nothing special, but the screen without the frame and the elegant laconic lines of the stand and the screen unit together make a very good impression. The plastic covers of the screen unit and the supports are made of plastic, mostly uncoated with a black matte surface. Exceptions two – a mirror-smooth wedge on top on the base, and the casing on the back of the rack has a dark gray silver coating.
The mechanical buttons are located behind the right hand.
The icon on the power button is a status indicator. At the top on the rear panel is a ventilation grille. The power connector and interface connectors are located on the thickening section at the rear and are oriented downwards. Traditionally, there is also a connector for the Kensington lock. The monitor ViewSonic VP2468has a built-in power supply. The stand is fixed on a metal turntable, which has a pattern of concentric grooves on top and is covered with black enamel. The rack has a fixed height, but a spring-supported mechanism with a steel rail ball bearing provides a vertical movement of the hinge on which the screen unit is mounted. Rubber stub-stub on the back of the rack covers a few holes in the frame of the rack.
In the lower one, you can insert a wire check that comes in the kit, and thus lock the hinge in the lower position. In one of the four others with M4 thread, you can screw the screw so that it enters the hole on the hinge, this will lock the hinge in one of the four positions in height. Correctly chosen length of the screw and its cap will then allow to install the plug into place. The cutout at the top of the rack forms a convenient handle for carrying the monitor assembly. The standard stand allows the screen unit to tilt slightly forward, tilt back, raise, turn left and right and turn to portrait orientation both clockwise and counterclockwise.
This turn in both directions allows to connect the two monitors in portrait orientation by narrow upper borders to each other. The base of the stand is relatively large in area, but it is mostly flat on the top, which increases the efficiency of using the working area of the table. The monitor ViewSonic VP2468 stands on the stand stably.
The design of the stand is stiff and strong, as the supporting elements of the stand are made of thick stamped steel or cast from an aluminum alloy. Rubber pads on the bottom on the base of the stand protect the surface of the table from scratches and prevent the monitor from sliding on smooth surfaces.
Cables coming from the monitor connectors can be passed through the center of the stand split from the bottom. If necessary, the standard stand can be disconnected (or not connected), and threaded holes (at the corners of the square with a side of 100 mm) become available for attachment to the VESA-compatible bracket. The monitor ViewSonic VP2468 is packed in a box, on which are depicted three birds – a corporate logo (the species name of birds can be spied on Wikipedia ). The box has slotted handles on the sides and a plastic handle on top, which makes it easier to transport the purchased monitor.
The monitor ViewSonic VP2468 is equipped with four digital inputs: DisplayPort in full-size and Mini-version, as well as two HDMI. The input is selected in the quick menu or in the full setup menu, there is also an automatic search for the active input. There is a full-sized DisplayPort output that allows other display devices to be connected in series if the video card and the intermediate links of this chain support DisplayPort 1.2 Multi-Stream Transport (MST). Sequential connection was checked only in duplicate mode on the second monitor, because no suitable equipment was found. The inputs are capable of receiving digital audio signals that are output after conversion to an analog view through the 3.5 mm mini jack. You can connect an external active speaker system or headphones to this jack. The output power was enough to have a large headroom in 32-ohm headphones with a sensitivity of 112 dB. The quality of the sound in the headphones is very good – a wide range of frequencies is reproduced, noise is not audible in the pauses, the sound is clear, without pronounced distortion. The volume is adjusted in the menu, the sound output can also be turned off. ViewSonic VP2468has a built-in USB (3.0) -concentrator with one input and four outputs, too, 3.0, but all outputs are located so that online connection to them is difficult.
The power indicator during operation is not brightly lit in blue (it is disabled in the menu), in standby mode it is red and does not light up if the monitor is conditionally turned off. The power button is easy to detect by touch, but if desired, you can lock it, thus eliminating the unintended shutdown of the monitor. When the monitor ViewSonic VP2468 is on and there is no menu on the screen, the first press of any button, except the power button, displays the start menu in the form of five icons exactly opposite the buttons and an explanatory window.
From top to bottom – the first three icons indicate shortcut shortcuts to the profile list, brightness and contrast adjustment, and input selection.
The penultimate icon – call the main menu, the last one – exit the menu. Further, when navigating through the menu, the buttons are also shown with help icons for the current functions. The menu is relatively large. When you adjust the image, the menu remains on the screen, which makes it difficult to assess the changes made. If necessary, you can turn the menu, turn on the light transparency of the background, select the timeout for automatic exit from the menu, and enable the lock to prevent unwanted changes to the settings. The Cyrillic font of the menu is flat, the inscriptions are readable. The quality of the translation into Russian is acceptable.
On the CD-ROM from the kit we found the user manuals in the form of PDF-files (Russian version is present). Unfortunately, the management is not very informative. In addition, there is a monitor driver on this disk (INF files and ICM color correction profile). On the company’s website we found the manual files (in Russian there are), the archives with drivers, the program for updating the firmware (and used it), the Auto Pivot utility (probably for automatic desktop flipping) and ViewSplit (apparently for distributing windows on the desktop Table, and also the program Colorbration for performing hardware calibration.
In the View mode list, there are a number of profiles with preset values for some settings, and when selecting a profile, the Special user can adjust the slope of the gamma curve in the dark area, turn on / off the mode with dynamically adjusting the backlight brightness and change the degree of matrix acceleration.
On the Color Settings page there are a number of typical settings, as well as a list with preset color correction profiles and three profiles obtained as a result of hardware calibration.
In the submenu Extension. Mode is the adjustment of the gain and bias of the three primary colors, as well as the tone and saturation of the six colors.
In addition, you can adjust the contour clarity, turn on the mode with a low output delay, reduce the intensity of the blue component (which, naturally, will lead to a change in the color balance) and turn on the mode with increasing uniformity in the screen area.
The modes of geometric transformation are three: one-to-one output by pixels in the center of the screen, the image is enlarged to the screen borders with 4: 3 aspect ratio preserving, the picture is forced to be stretched to the entire screen area. There is also a function of a small increase in the image so that its edges go beyond the display area.
With HDMI connection, the resolution was up to 1920 × 1080 at 60 Hz frame rate. To the quality of the image no complaints, all gradations of shades are displayed. The work on DisplayPort is described below, since all hardware tests were performed with this method of connection. Note that the signal from 10 bits per color monitor does not support.
The cinematic modes of operation were tested when connecting to the Blu-ray player Sony BDP-S300. The work on HDMI was checked. The monitor senses signals 576i / p, 480i / p, 720p, 1080i and 1080p at 50 and 60 fps. 1080p at 24 fps is supported, and frames in this mode are output with the same duration. In the case of interlaced signals, the picture is simply displayed by fields. For a 1080i / p signal, the picture is displayed in the original resolution one by one in pixels (if the overscan is disabled). Fine gradations of shades differ both in lights and in shadows. Brightness and color definition are very high. Interpolation of low resolutions to matrix resolution is performed without significant artifacts.
The outer surface of the matrix is black, semi-matt (more matte than mirror), and the outer layer of the matrix feels relatively rigid by sensations. There is no noticeable “crystalline” effect. The dullness of the surface of the matrix allows you to work with comfort in the case of a typical layout of the monitor, the user and the fixtures in the room.
A clear image of the pixel structure due to the matte surface can not be obtained, however, if desired, on the fragment below it can be seen that each subpixel is divided by a neck into two equal domains, and if the desire is strong, an IPS-specific structure is defined in the form of parallel strips.
Focusing on the surface of the screen revealed chaotically located microdefects of the surface, which correspond in fact to matte properties:
The grain of these defects is several times smaller than the size of subpixels, so the focusing on microdefects and the “hopping” of focus on subpixels with a change in the angle of view are weak, because of this there is no “crystalline” effect.
To evaluate the brightness growth, we measured the brightness of 256 shades of gray (from 0, 0, 0 to 255, 255, 255) in the sRGB mode. The graph below shows the gain (not the absolute value!) Of the brightness between adjacent semitones.
The increase in brightness gain is more or less uniform on average, and each subsequent shade is significantly brighter than the previous one. In the dark region, an almost linear increase in brightness is observed, which is close to the requirement of the sRGB standard:
The approximation of the obtained gamma curve gave an indicator of 2.28, which is slightly higher than the standard value of 2.2, while the real gamma curve deviates slightly from the approximating power function:
The spectrophotometer i1Pro 2 and the Argyll CMS software suite (1.5.0) were used to evaluate the color quality.
Color coverage varies slightly depending on the selected profile. In the mode without correction, the coverage is slightly more than sRGB.
And when choosing the profile sRGB coverage is almost equal to the coverage of the corresponding standar.
Below is the spectrum for the white field (white line) superimposed on the spectra of red, green and blue fields (lines of corresponding colors).
Such a spectrum with a relatively narrow peak of blue and with wide humps of green and red colors is typical for monitors that use LED lighting with a blue emitter and a yellow phosphor.
For ViewSonic VP2468, for each specific instance (the serial number is indicated in the report), the factory calibration of the color balance for several profiles and uniformity is performed, as evidenced by the attached report.
Of course, one can not expect that a calibration, however good it may be, can be maintained for the entire duration of the monitor, and some specific color requirements are not excluded, that is, a monitor especially designed for professional color work needs to be periodically calibrated. The manufacturer represented by the company ViewSonic offers its version in the form of the program Colorbration , designed to perform hardware calibration of the monitor using common models of calibrators. Note, in fact, this is a special truncated version of the program i1Profiler from the company X-Rite.
The result of this program is the correction of the color matching table in the monitor (LUT), tied to the CALIBE profiles . 1/2/3 . Let’s see what can happen, compare the built-in factory-calibrated sRGB profile (graphics with the same signature), the result of the Colorbration program when sRGB is selected as the target (Graphics Cal. ), And what happens when the color balance is manually adjusted by the intensity settings of the primary colors In the monitor itself ( Corr. ). The graphs below show the color temperature at different parts of the gray scale and the deviation from the blackbody spectrum (parameter ΔE):
The closest to the black range can be ignored, since the color rendition is not so important in it, and the error in measuring the color characteristics is high. Manual correction in this particular case won, because it allowed to obtain the minimum value of ΔE with minimal time and effort. Hardware calibration with the program Colorbration from our point of view is not entirely successful, since the color temperature in the dark area deviates from 6500 K more than in the case of the factory profile and manual correction.
Measurements of brightness were made at 25 points of the screen, located in increments of 1/6 of the width and height of the screen (the boundaries of the screen are not included). The contrast was calculated as the ratio of the brightness of the fields at the measured points. First, we present the results obtained without activating the brightness equalization function and ΔE over the field.
The uniformity of white is good, and black, and as a consequence, contrast – is much worse. The contrast for this type of matrix is typical. The photo below gives an idea of the distribution of the brightness of the black field on the screen area.
Variation of the brightness of the black field is noticeable, but does not reach the critical level. If the requirements for uniformity of the black field are high, then you should check the monitor ViewSonic VP2468 when purchasing and, if necessary, select a copy with a better uniformity.
Turn on the mode with increasing the uniformity of white (and this can be done by selecting the profile sRGB ) and see what it will lead to.
On the behavior of black, the inclusion of this function had little effect (some differences may be due to mismatches in the measurement points), which is natural, the uniformity of the white has increased, but the brightness of the white and the contrast have greatly decreased. The choice is for the user, although, from our point of view, there is no special meaning in this function, the white field is so uniform enough in brightness and color tone.
When you turn on the mode with dynamic brightness adjustment, the steady contrast formally increases to infinity, because on the black field in the entire screen the backlight simply turns off. The graph below shows how the brightness (vertical axis) increases when switching from black to white when the brightness adjustment is turned off and on (the maximum value of the corresponding parameter).
It can be seen that the backlight turns on with a noticeable delay, then gradually increases to the maximum value. Practical use of this function is small, but the manufacturer can indicate a huge contrast value in the characteristics. Note that the inclusion of the dynamic brightness adjustment function is accompanied by the appearance of notable artifacts of the image.
The brightness of the white field in the center of the screen and the power drawn from the network.
In standby mode, the monitor consumes 0.25 W, and in the conditionally off state, 0.2 W.
The brightness of the monitor ViewSonic VP2468 changes precisely with the brightness of the backlight, i.e. without sacrificing the quality of the image (the contrast and the number of distinct gradations are maintained), the brightness of the monitor can be varied within wide limits, which makes it possible to work comfortably and watch movies in both the lighted and dark rooms. At any brightness level, the modulation of the backlight is practically non-existent, so there is no flickering of the screen. In the proof we give the graphs of the dependence of brightness (vertical axis) on time (horizontal axis) for different values of brightness adjustment.
The monitor’s heating can be estimated from the above pictures from the IR camera obtained after a long-term monitor operation at the maximum brightness in a room with a temperature of approximately 24 ° C.
The back panel is heated slightly – maximum 29 ° С. Heating in front at the bottom edge of the matrix reaches 34 ° C, apparently, there is an LED backlight bar.
The response time depends on the setting of the Response time , which controls the overclocking of the matrix. The adjustment steps are three. The graph below shows how the turn-on and turn-off times change when black-white-black (bars on and off ) change, and the average total time for transitions between halftones ( GTG bars).
Below are the graphs of halftone transition between 40% and 60% hues and back for different settings of Response time (vertical – brightness, horizontally – time, for visualization graphics are arranged sequentially).
Even at the maximum overclocking artifacts are practically not noticeable. The matrix is not the fastest, but from our point of view, this speed is quite enough for games in dynamic games.
We determined the full delay in the output from switching the pages of the video buffer before the image was displayed on the screen. However, the final value did not include the unknown fixed delay from the request to switch the pages of the video buffer before starting the ADC with an external photosensor installed in the center of the monitor screen, as well as some constant / variable delay caused by the fact that the Windows OS is not a real-time system with Normalized delays and features of the video card, its driver and Microsoft DirectX. As a result, the output delay of the image was 9-10 ms for connection via DisplayPort and HDMI. The inclusion of a mode with a reduced output delay reduced the delay by a negligible amount. The value of the delay is scanty, and will not be felt even in the most dynamic games.
To find out how the brightness of the screen changes when deviated from the perpendicular to the screen, we performed a series of measurements of the brightness of black, white, and grayscale at the center of the screen over a wide range of angles, deflecting the sensor axis in vertical, horizontal and diagonal directions from angle to corner.
We note a smooth decrease in brightness in the deviation from the perpendicular to the screen in all directions, while the graphs do not intersect in the whole range of measured angles. Viewing angles for the brightness drop in this monitor are excellent. If you deviate in the diagonal direction, the brightness of the black field begins to increase sharply already at 20-30 ° deviation from the perpendicular to the screen. If you sit from the screen at a distance of 50-60 cm, then the black field in the corners will be noticeably lighter than in the center, however, remaining approximately neutral gray in color. The contrast in the range of angles ± 82 ° for all directions exceeds 10: 1.
To quantify the color change, we performed colorimetric measurements for white, gray (127, 127, 127), red, green and blue, as well as light red, light green and light blue fields in full screen using an installation similar to the one , Which was used in the previous test. Measurements were made in the range of angles from 0 ° (the sensor is directed perpendicular to the screen) to 80 ° in steps of 5 °. The received intensity values were recalculated in ΔE relative to the measurement of each field at the perpendicular position of the sensor relative to the screen.
As a reference point, you can choose a deviation of 45 °, which may be relevant in the case, for example, if the image on the screen is viewed by two people at a time. The criterion for maintaining the correctness of colors can be considered as the value of ΔE less than 3.
The stability of colors is generally good, which is one of the main advantages of IPS-type matrices.
We believe that the ViewSonic VP2468 monitor belongs to the class of semi-professional devices for working with images. “Semi -“, as it lacks video signal support from 10 bits per color and wide color coverage, and the resolution and screen size by modern criteria are not very large. However, if you need a relatively small monitor with good color rendering, the ViewSonic VP2468 will be a very promising candidate. Note the frameless design and the narrow gap between the boundary of the display area and the edges of the screen block. As a result, the monitor will look good as a part of multi-screen configurations. In this case, the design of the standard stand allows two monitors to be joined in portrait orientation by narrow borders to each other. The convenience of working with such multiported planes is enhanced by the possibility of connecting the monitors via the DisplayPort chain. In general, the monitor turned out to be universal, it can not only work with graphics, but also process video, watch movies, play even dynamic games and, of course, perform typical office work.