From: news@dis.demon.co.uk


Newsgroups: sci.virtual-worlds
From: pcats@cryton.demon.co.uk (Patrick Arnold)
Path: cryton.demon.co.uk!pcats
Subject: Re: TECH: LCD Screens 
Distribution: world
References: <2fbvk6$ku9@news.u.washington.edu>
Organization: The Serial Port
Reply-To: pcats@cryton.demon.co.uk
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Date: Thu, 23 Dec 1993 18:10:16 +0000
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There is another option to using a VGA to PAL/NTSC converter. Most SVGA 
chipsets are much more programmable than most people realise, and can be 
directly programmed to generate a screen mode that has the correct timings
and resolution for either PAL or NTSC. You then only need to run the RGB
signal from the SVGA board through an RGB to composite video convertor, and 
there you go! 

I have used both Trident and NCR chipset SVGA boards for this method, and
they both work very well. Most other chipsets should work. Most will also 
generate a correct interlaced signal.

The RGB signal can be fed directly into the Panasonic LCD TV/monitor by 
tapping into the RGB signal between the video decoder chip and the LCD driver
chip. In the ones I have used, it required the removal of three surface mount
resistors. The composite sync signal is fed into the composite video socket.
The end result is very good. The Panasonic LCD display has a much higher
resolution and better colour/black level than the Casio displays, although
it is rather more expensive. After all, you get what you pay for!

-- 
The shortest distance between two points has not yet been built.

pcats@cryton.demon.co.uk vox+44(749)670058 fax+44(749)670809 dat+44(749)670030