With a 27.9” screen size, the BenQ offers a pixel density of 157.91 PPI (Pixels Per Inch). The photo below gives a rough idea of how the Lagom text test appeared. FreeSync worked as advertised and removed bothersome tearing and stuttering from the experience within its 40 – 60Hz (40 – 60fps) window of operation. Having browsed around the internet to dig deeper into this issue, I found several people that have encountered the same problem, though it seems to be related to defective samples. And finally there is 1:1, a pixel mapping feature that will only use the pixels called for in the source resolution and keep remaining pixels black. Most users will probably wish to enable VSync when using FreeSync to ensure that they don’t get any tearing. It also provides good interpolation performance, capable of scaling non-native resolutions (such as Full HD and WQHD) in a way that retains sharpness considerably better than some models.The bottom line; an affordable entry into the world of ‘4K’ with decent all-round performance, but don’t be sucked into the headline ‘HDR’ feature. This is typical for a TN panel.Performance on the black level tests was good from a normal viewing position. This allows for high precision when displaying shades for HDR content. Or dark building interiors, which also works. We found this too aggressive, even set to ‘1’, giving an artificial look to the image which we didn’t find appealing. Darker greys represent lower luminance and therefore greater deviation from the central point than lighter greys. There was some more obvious dithering for some of the medium shades and they appeared to flicker, much as in the example we discussed in the PWM section earlier in the review. As this feature is mainly used to enhance viewing conditions in uncontrolled environments, I didn’t utilize it for the purpose of this review. We made similar observations on Dirt Rally. The brighter elements still stood out quite well against darker surroundings and it was nice not to have the atmosphere interrupted by ‘IPS glow’. HDR implementations vary from title to title and some are better than others. The second is ‘Aspect’ which will respect the source resolution aspect ratio but fill up the screen as much as possible (for example, using interpolation vertically but displaying black bars either side for a 4:3 resolution). PositivesNegativesFairly rich and natural colour output with good central gamma tracking and flexibility in the OSD Perceived saturation shifts due to TN panel technology. Performance on the black level tests was good from a normal viewing position. Overall this monitor provided a reasonable but not spectacular performance in all areas, really, making it a decent affordable entry into the world of ‘4K’. Additional testing was performed with a Club3D Radeon R9 290 royalAce FreeSync-compatible GPU. Note that individual units vary when it comes to uniformity and that there can be further deviation beyond the points measured. Shades had largely appropriate depth and saturation for the central bulk of the screen, with some fairly rich and lush-looking greens and rich earthy browns giving the environments a natural appearance. Some users will light this sort of setting for more restful viewing, particularly in the evening where blue light exposure should be reduced as much as possible. This red striping readily shifted to orange and green alongside head movement. Timestamps: Features & Aesthetics Contrast Colour reproduction HDR (High Dynamic Range) Responsiveness ConclusionMany manufacturers are now pushing HDR (High Dynamic Range) as a head-turning headline feature for displays. Not a particularly generous colour gamut, falling far short of the DCI-P3 near-term HDR goal Reasonable static contrast in-line with expectations and no ‘IPS glow’A bit of graininess from the screen surface, static contrast a bit below specified value and no local dimming support or suitable peak luminance for HDRVery low input lag and most pixel responses fast enough for a good 60Hz performance, plus FreeSync works as intended Some weaknesses in pixel responsiveness and some users would find the refresh rate restrictive A relatively low price for a ‘4K’ UHD model, with the resolution providing excellent desktop real-estate and clarity benefits for high resolution images, games and movies. There is a list of GPUs which support the technology here, with the expectation that future AMD GPUs will support the feature too. Several 4K displays end up having different input lag values when measured between HDR and SDR formats, however the EL2870U maintains the same input lag in either mode. We check over 130 million products every day for the best prices. Note that individual units vary when it comes to uniformity and that there can be further deviation beyond the points measured. This was especially true using the regular ‘HDR’ setting, but ‘Cinema HDR’ also exhibited this somewhat flooded experience with a lack of depth or atmosphere. There were obvious vertical gamma shifts that affected detail levels in dark scenes when comparing content displayed higher up vs. lower down the screen.
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