In order to be awarded the label "HD ready 1080p" (not equivalent to Full HD) or the older "HD Ready" logo a display device has to cover the following requirements:
| HD Ready 1080p | HD Ready | |
|---|---|---|
| Minimum native resolution | 1920x1080 | 720 horizontal lines in widescreen ratio |
| Accepted video formats are reproduced without distortion | Yes | No |
| Display 1080p and 1080i video without overscan (1:1 pixel mapping) | Yes | No |
| Display native video modes at the same (or higher) refresh rate. | Yes | No |
| Analogue YPbPr HD input | Yes | Yes |
| Digital HDMI or DVI HD input | Yes | Yes |
| 720p HD progressive (1280x720 @50 & 60HZ) | Yes | Yes |
| 1080i HD (1920x1080 interlaced @50 & 60HZ) | Yes | Yes |
| 1080p HD (1920x1080 progressive @24, 50 & 60HZ) | Yes | No |
| The HDMI or DVI input supports copy protection (HDCP) | Yes | Yes |
Older products that bear the label "HD ready" may not display the full picture resolution possible from a HD source. Most HD-ready sets do not have enough pixels to give true pixel-for-pixel representation without interpolation of the higher HD resolution (1920x1080) - or (in rare cases) even the lower HD resolution (1280x720) horizontally (CRT based sets, or the plasma-based sets with 1024x768 resolution). This limitation has been removed in the "HD Ready 1080p" logo
The term HD compatible is also being used in Europe to indicate that a display device has HDMI capability but with lower than HD-ready resolution.
The following technical references apply to the above descriptions:
DVI: DDWG, “Digital Visual Interface”, rev 1.0, Apr 2, 1999 as further qualified in EIA861B, “A DTV Profile for Uncompressed High Speed Digital Interfaces” May 2002, furthermore allowing both DVI-D and DVI-I connectors, requiring compliance to both 50 and 60Hz profiles, and requiring support for both 720p and 1080i video formats.
HDMI: HDMI Licensing, LLC, “High-Definition Multimedia Interface”, rev.1.1, May 20, 2004
HDCP: Intel, “High-Bandwidth Digital Content Protection System”, rev 1.1, June 9, 2003.
(NB: on DVI HDCP rev 1.0 will apply)
YPbPr: EIA770.3-A, March 2000, with the notice that the connectors required may be available only through an adaptor.
http://en.wikipedia.org/wiki/HD_Ready
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