Summary of DisplayHDR Specs under CTS 1.1

The table below is a summary of the specifications for the VESA DisplayHDR and DisplayHDR True Black standards as they are updated by CTS 1.1 released on September 4th, 2019. A complete description of these specifications and the VESA certification test criteria are available in DisplayHDR CTS v1.1 which can be downloaded here, along with other free VESA standards.

Overview

The DisplayHDR 1.1 specification includes a number of key performance updates, such as:

  • Active dimming – DisplayHDR now mandates active dimming performance levels, a feature that when adopted in displays can reduce power consumption and yield significantly darker black levels
  • DisplayID accuracy – ensures that accurate luminance and color gamut data is populated in the DisplayID or legacy Extended Display Identification Data (EDID), which enables the GPU to optimize the video signal for that display to ensure the highest display performance
  • Dual corner box test – the black-level test has been updated with larger corner box structures to allow for accurate colorimeter measurement of both black and white levels, resulting in improved dynamic contrast ratio testing
  • New color gamut specifications – DisplayHDR now includes a 10 percent color patch test in addition to the 100 percent full screen color test, with both tests now using the display’s maximum luminance and RGB primary color values from the DisplayID/EDID; this revised test method more accurately determines the color gamut that will render on the display when running Windows
  • Combined color luminance – DisplayHDR has added a mechanism to validate full color volume at the full logo level luminance
    New Delta-ITP test – added to test that the luminance level on the display is correctly rendered, helping to ensure the faithful reproduction of the original content creator’s intent (luminance, and D65 white balance)
  • On-screen display (OSD) mode indication – any DisplayHDR-certified monitor with an on-screen menu function must now clearly indicate which modes support DisplayHDR, making it easier for users to optimize their display settings
  • DisplayPort certification specification – any DisplayHDR-certified monitor that has a DisplayPort interface must also undergo DisplayPort certification, ensuring that the display performs optimally with VESA DisplayPort-certified cables and other peripherals

The new DisplayHDR CTS 1.1 test tool and measurement template is available for download from the VESA GitHub page. The tool will also be publicly available soon from the Microsoft Store.

CTS 1.1 Specifications Summary Table

DisplayHDR Performance Tier:
400 500 600 1000 1400 400
True Black
500
True Black
MINIMUM LUMINANCE LEVEL
10% Center Patch Test – Minimum Luminance Level (cd/m2) 400 500 600 1000 1400 400 500
Full-screen Flash Test – Minimum Luminance Level (cd/m2) 400 500 600 1000 1400 250 300
Full-screen Long-duration Test – Minimum Luminance Level (cd/m2) 320 320 350 600 900 250 300
BLACK LEVEL
Dual Corner Box Test – Screen Center, Maximum Luminance Level (cd/m2) 0.4 0.1 0.1 0.05 0.02 0.0005 0.0005
Dual Corner Box Test, Both White Corners, Minimum Luminance Level (cd/m2) 300 375 450 750 1050 300 375
ACTIVE DIMMING/CHECKERBOARD TEST
Active Dimming – Ratio of maximum white to black of a 50cd/m2 checkerboard (stops) 11 11.6 12 13 13.5 N/A N/A
Active Dimming – Ratio of maximum white to black of a 5cd/m2 checkerboard (stops) 12 12.6 13 14 14.5 N/A N/A
Checkerboard – Max Black Level at Full Luminance (True Black only) 0.0005cd/m2
COLOR GAMUT AND MINIMUM LUMINANCE SPECIFICATIONS
ITU-R BT.709 Coverage for Both 10% and Full-screen Color Patches 95% 99% 99% 99% 99% 99% 99%
DCI-P3 CIE D65e Coverage for Both 10% and Full-screen Color Patches N/A 90% 90% 90% 95% 90% 90%
Combined Color Luminance (Lr + Lg + Lb) 10% Color Patch Test (cd/m2) 400 500 600 1000 1400 400 500
Combined Color Luminance (Lr + Lg + Lb) Full-screen Color Test (cd/m2) 320 320 350 600 900 250 300
MINIMUM BIT-DEPTH SPECIFICATIONS
10-bit Video Signal, per Channel
Minimum Driver-IC Bit Depth (+2b Dithering FRC) 8b 8b+2 8b+2 8b+2 8b+2 8b+2 8b+2
Minimum 8-bit Digital-to-analog Conversion
Backlight Control 8-bit Accuracy N/A N/A
DISPLAYHDR RISE-TIME SPECIFICATIONS
Maximum Number of Frames for Rise from Black to Maximum Luminance 8 8 8 8 8 2 2
LUMINANCE AND WHITE POINT ACCURACY
Permitted Maximum Delta-ITP error for tests at 5 and 15cd/m2 20
Permitted Maximum Delta-ITP error for tests at 50, 100, and 200cd/m2 15
Permitted Maximum Delta-ITP error for tests at 50% of Tier Level maximum N/A 15 15 15 15 N/A 15