Thursday, March 27, 2008

HD ready 1080p

n 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 (encompasses Full HD) 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 & 60 Hz) Yes Yes
1080i HD (1920x1080 interlaced @50 & 60 Hz) Yes Yes
1080p HD (1920x1080 progressive @24, 50 & 60 Hz) 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 an 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 60 Hz 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.

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