DisplayHDR Specification Versions
On September 4th, 2019, VESA announced DisplayHDR CTS v1.1 the first major update to the fully open standard specifying HDR quality. Display products may now be certified under either spec, and all products must certify under the new DisplayHDR 1.1 spec after May 2020.
A complete description of the original specifications and the VESA certification test criteria are documented in DisplayHDR CTS v1.0 which can be downloaded here, along with other free VESA standards. Products may be certified under CTS 1.0 through the end of May 2020.
Overview of Performance Criteria
Under CTS 1.1
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
DisplayHDR Test Tool
VESA is the first standards body to publicly develop a test tool for HDR qualification, utilizing a methodology for the tests listed below that end users can apply without having to invest in costly lab hardware.
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.
The DisplayHDR test tool for CTS 1.0 can be downloaded from the Microsoft Store.