Monday, December 11th 2017
VESA Announces the DisplayHDR v1.0 Specification
The Video Electronics Standards Association (VESA) today announced it has defined the display industry's first fully open standard specifying high dynamic range (HDR) quality, including luminance, color gamut, bit depth and rise time, through the release of a test specification. The new VESA High-Performance Monitor and Display Compliance Test Specification (DisplayHDR) initially addresses the needs of laptop displays and PC desktop monitors that use liquid crystal display (LCD) panels.
The first release of the specification, DisplayHDR version 1.0, establishes three distinct levels of HDR system performance to facilitate adoption of HDR throughout the PC market. HDR provides better contrast and color accuracy as well as more vibrant colors compared to Standard Dynamic Range (SDR) displays, and is gaining interest for a wide range of applications, including movie viewing, gaming, and creation of photo and video content.
VESA developed the DisplayHDR specification with the input of more than two dozen active member companies. These members include major OEMs that make displays, graphic cards, CPUs, panels, display drivers and other components, as well as color calibration providers. A list of participating companies is available here.
DisplayHDR v1.0 focuses on LCDs, which represent more than 99 percent of displays in the PC market. VESA anticipates future releases to address organic light emitting diode (OLED) and other display technologies as they become more common, as well as the addition of higher levels of HDR performance. While development of DisplayHDR was driven by the needs of the PC market, it can serve to drive new levels of HDR performance in other markets as well.
Brand Confusion Necessitates Clearly Defined HDR Standard
HDR logos and brands abound, but until now, there has been no open standard with a fully transparent testing methodology. Since HDR performance details are typically not provided, consumers are unable to obtain meaningful performance information. With DisplayHDR, VESA aims to alleviate this problem by:
The specification establishes three HDR performance levels for PC displays: baseline (DisplayHDR 400), mid-range (DisplayHDR 600) and high-end (DisplayHDR 1000). These levels are established and certified using eight specific parameter requirements and associated tests, which include:
"Developing this specification is a natural expansion of our range of video standards," said Bill Lempesis, VESA executive director. "Moreover, we are the first standards body to develop a publicly available test tool for HDR qualification, utilizing a methodology for the above-mentioned tests that end users can apply without having to invest in costly lab hardware. Most of the tests require only a colorimeter, which many users already own. Ease of testing was a must-have requirement in order to make DisplayHDR a truly viable, consumer-friendly spec."
New products complying with the DisplayHDR specification will be demonstrated at the Consumer Electronics Show (CES), January 9-12, 2018 at the Las Vegas Convention Center South Hall, DisplayPort booth #21066.
The first release of the specification, DisplayHDR version 1.0, establishes three distinct levels of HDR system performance to facilitate adoption of HDR throughout the PC market. HDR provides better contrast and color accuracy as well as more vibrant colors compared to Standard Dynamic Range (SDR) displays, and is gaining interest for a wide range of applications, including movie viewing, gaming, and creation of photo and video content.
DisplayHDR v1.0 focuses on LCDs, which represent more than 99 percent of displays in the PC market. VESA anticipates future releases to address organic light emitting diode (OLED) and other display technologies as they become more common, as well as the addition of higher levels of HDR performance. While development of DisplayHDR was driven by the needs of the PC market, it can serve to drive new levels of HDR performance in other markets as well.
Brand Confusion Necessitates Clearly Defined HDR Standard
HDR logos and brands abound, but until now, there has been no open standard with a fully transparent testing methodology. Since HDR performance details are typically not provided, consumers are unable to obtain meaningful performance information. With DisplayHDR, VESA aims to alleviate this problem by:
- Creating a specification, initially for the PC industry, that will be shared publicly and transparently;
- Developing an automated testing tool that end users can download to perform their own testing if desired; and
- Delivering a robust set of test metrics for HDR that clearly articulate the performance level of the device being purchased.
The specification establishes three HDR performance levels for PC displays: baseline (DisplayHDR 400), mid-range (DisplayHDR 600) and high-end (DisplayHDR 1000). These levels are established and certified using eight specific parameter requirements and associated tests, which include:
- Three peak luminance tests involving different scenarios - small spot/high luminance, brief period full-screen flash luminance, and optimized use in bright environments (e.g., outside daylight or bright office lighting);
- Two contrast measurement tests - one for native panel contrast and one for local dimming;
- Color testing of both the BT.709 and DCI-P3 color gamuts;
- Bit-depth requirement tests - these stipulate a minimum bit depth and include a simple visual test for end users to confirm results;
- HDR response performance test - sets performance criteria for backlight responsiveness ideal for gaming and rapid action in movies by analyzing the speed at which the backlight can respond to changes in luminance levels.
"Developing this specification is a natural expansion of our range of video standards," said Bill Lempesis, VESA executive director. "Moreover, we are the first standards body to develop a publicly available test tool for HDR qualification, utilizing a methodology for the above-mentioned tests that end users can apply without having to invest in costly lab hardware. Most of the tests require only a colorimeter, which many users already own. Ease of testing was a must-have requirement in order to make DisplayHDR a truly viable, consumer-friendly spec."
New products complying with the DisplayHDR specification will be demonstrated at the Consumer Electronics Show (CES), January 9-12, 2018 at the Las Vegas Convention Center South Hall, DisplayPort booth #21066.
25 Comments on VESA Announces the DisplayHDR v1.0 Specification
BTW i saw no mention of HDR10(+) or Dolby Vision, is there any correlation between them and HDR400-1000?
99% Rec. 709 (same palette as HDTV)
90% DCI-P3 (25% more colors than sRGB)
8-bit DAC
10-bit image processing
So...this standard's purpose is clearly to push for higher brightness (the brightness levels, black levels, ability to localize diming, etc.). Right now, there is a systemic problem of HDR panels needing more brightness but inadequate information in the data to know when more brightness is a good thing and when it is a bad thing. DisplayHDR appears to try to get the entire industry on the same page in that regard. It's not aiming for the best colors or the most color data; it's aiming to standardize brightness which is arguably more important to HDR than color depth or size of palette.
I suspect in five years, they'll update the spec to include Rec. 2020 and 10-bit DAC. Not entirely sure why they didn't just add that now as Ultra HDR or something.
Unless you somehow think that defining HDR1000 only would magically spur everyone into producing only high quality, cheap OLEDs.
One thing I've always wondered was why HDR displays didn't have a contrast ratio standard, but then I remembered LG still uses their terrible IPS displays on TVs. Go into any store and compare them to a proper VA panel on a Sony/Samsung set and you can see how washed out everything is. UHD Phase Adefined HDR as 13 stops of DR back in 2016, which means well over 3000:1 static contrast ratio, which IPS cannot even hope to achieve. There's no reason computer monitors are lacking so much compared to TVs at this point. It's not just about cheap LCD configs like TN, but IPS inferiority is also a huge issue.
- '400' = TN-IPS,
- '600' = VA,
- '1000' = OLED.
www.rtings.com/tv/reviews/lg/e7-oled
www.rtings.com/tv/reviews/sony/z9d
www.rtings.com/tv/reviews/sony/x900e
www.rtings.com/tv/reviews/samsung/ks8000
www.rtings.com/tv/reviews/sony/x930d
www.rtings.com/tv/reviews/lg/e6-oled
EDIT: And in case you're still saying LCD only recently got better, here's your 2 gens ago OLED.
www.rtings.com/tv/reviews/lg/ef9500
Terrible brightness. OLED always gets massive brightness increases every gen but for TVs, they're still far off from LCD + dedicated backlight system.
And since you did say the Z9D was expensive, here's a far cheaper Sony set from this year that's actually brighter.
www.rtings.com/tv/reviews/sony/x930e
So yes, my first post wasn't exactly spot-on. But I still don't have a problem with defining three levels of HDR compliance.
Edit: Also, your usage of LG OLEDs as an example is not very fortunate as LG uses some sort of "fake" OLED that further impacts brightness. But competing implementations, using "true" OLED aren't that much better.
Ultra HD Premium certification accounts for it and sets brightness targets for OLEDs at lower level (their superior blacks let them achieve better contrast).
People buy Samsung's QLEDs over OLED TVs out of sheer ignorance.
Crank up the saturation and brightness of the model you want sold, place it among models set to lower brightness and saturation - problem solved.
But the fault lies in the panels as well. No panel is better than the rest in all aspects, so no matter how informed you are, you still have to compromise when buying. I may be wrong here (because I haven't followed the market too closely), but I think Sony's Triluminous display holds the best promise now and in the near future.
The only thing "fake" in TVs are fake 4K and fake HDR. Fake 4K occurs when an RGBW stripe is implemented improperly (LG does this for LCD but not for OLED). The extra white subpixel in the OLED displays are mainly for brightness. LG's LCD TVs don't give you the extra white subpixel but instead replaces another subpixel. You can read up on that here.
www.techhive.com/article/3104880/smart-tv/how-lg-uses-fuzzy-math-to-label-some-of-its-lcd-tvs-as-4k.html
Fake HDR on the other hand is accepting a higher bit depth HDR signal but only displaying it on a 8 bit display, as well as other things like not enough contrast ratio. Even with FRC you can't get the true color depth of a true 10-bit panel. For contrast, if the TV only has 1500:1 static contrast display, then there's no way to display the 13+ stops of DR that makes it HDR. OLED has it easy here since it infinite contrast, VA is getting there with the aid of local dimming backlight systems, but IPS will never reach the contrast ratios needed by HDR. The wikipedia tables gives you a rough estimation of how much contrast you need for the stops of DR you actually get. DR is logarithmic which is why there's such massive jumps in contrast ratios between 10 and 13 stops.
en.wikipedia.org/wiki/High-dynamic-range_imaging