[opendtv] Re: News: CEA FORECASTS CONSUMER ELECTRONICS REVENUE
- From: Ron Economos <k6mpg@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 14 Jan 2007 19:13:24 -0800
Most of the LCD panels have two modes, a computer
mode and a video mode. In video mode, overscan
is added to to image, so there has to be some scaling.
I haven't tested any of the new 1920x1080 panels,
but for those that may want to, I have a bunch of
test patterns available on my website.
http://www.w6rz.net/
These are MPEG-2 Transport Streams with mostly
1920x1080 video. The horizontal resolution specific
patterns are:
http://www.w6rz.net/burst1920.zip (20 to 35 MHz 100% bursts 1920x1080)
http://www.w6rz.net/phase0.zip (9.28125, 12.375, 18.5625 and 37.125 MHz
100% bursts 1920x1080)
http://www.w6rz.net/horzpix1.zip (Alternating black/white 1 pixel full
field 1920x1080)
http://www.w6rz.net/horzpix2.zip (Alternating black/white 2 pixels full
field 1920x1080)
http://www.w6rz.net/sweeps.zip (combined luma and chroma frequency sweep)
Ron
Craig Birkmaier wrote:
At 7:31 PM -0800 1/13/07, Ron Economos wrote:
There seems to be plenty of 1920x1080 LCD displays,
from all manufacturers, on the market.
And if you can bypass the video processing circuitry and write to the
display as a computer does, you might be able to create very high
frequency details - even details that are illegal in a properly
filtered video system. But the frequency response of the video
processing circuitry in LCD panel displays is typically quite
different than the theoretical limits of the display itself.
If you can find the actual tech specs, you will see that the response
for video is typically well below what is theoretically possible. I
remember a display shoot-out that Mark Schubin put together at a Tech
retreat some years back. These included some of the best projection
displays systems and studio monitors available at the time. NONE of
them could reproduce details much higher than 22 MHz - the MTF started
approaching zero around 20MHz for most of the displays.
Here is a link to an article about this subject I wrote back in '99.
http://www.digitaltelevision.com/future/future7.shtml
Regards
Craig
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