[opendtv] LCD design innovations for TV

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
  • Date: Wed, 21 Jul 2004 13:22:45 -0400

There's an interesting article in the Electronic Design magazine
I just received that might interest TV guys. It's about
innovations being introduced into LCD designs specifically for
the larger displays and faster motion required for TV
applications, and to accommodate color response differences
compared with CRTs.

The article is at


The business about getting data to the pixels is interesting
in that it mimics what happened in computer backplane
designs. As clock rates went up, the width of card cages
became a real issue. Same happens with LCDs. One of the
solutions he's discussing for LCDs is exactly the same as
what computer backplanes are having to do: stop using
linear parallel buses and go to serial point to point

Interesting discussion about the differences in primary color
responses between LCDs and CRTs. Seems LCDs have too much
blue, when close to white, and too much red, when close to

The article lists the highlights in a handy sidebar.



The Panel-Size Issue

Though today's differential bus architectures excel at
delivering the bandwidth needs across a 15- to 19-in. panel,
signal integrity becomes a problem as panel size increases.
The Color-Depth Issue

The trend for televisions is a color depth of 1 billion
colors (10-bit color), creating an eightfold increase in
decode logic and making column-driver die size and cost
nearly prohibitive. One suggestion is to change from the
traditional R-DAC architecture.

Motion-Video Performance

Numerous companies are working on proprietary solutions for
response-time compensation. These would ultimately raise
LCD motion-video performance to match or exceed today's
high-end TVs.
Color Quality

Solving color-quality problems typically involves the
timing controller, which manipulates incoming digital data
via data expansion and dithering. However, a programmable
voltage-to-luminance function for each pixel color will
probably be the way to go.

Sidebar: A History Of LVDS And RSDS Interfaces

This sidebar discusses how the low-voltage differential
signaling and reduced-swing differential signaling
interfaces improved LCD data flow.
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