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On Mar 17, 5:01pm, Ken Yee/UB Networks wrote:
> Subject: RE: WD90c24 chip
> > Yes, many of the newer notebooks are capable of displaying 64k colors
> > on the notebook screen, using the WD90c24a. I don't think the
> > original TP750's are capable of that display and I don't know when
> > the change was made (TP755Ce's?).
> The change was made on the TP755CE/CD. The TP701C Butterfly
> also has a 64K display and with the 90c24 in 16.7M color mode, the
> TFT display can show 1.7M unique colors :-)
>-- End of excerpt from Ken Yee/UB Networks
The number of colors which can be displayed has nothing to do with the TFT
panel. The transistors in a TFT display are not switching transistors -- they
are current amplifiers. The TFT display has three transisistors, one each for
the red, green, and blue pixel. Each of these pixels is driven by an analog
signal. In other words, TFT's are *analog* panels -- not digital. They can
display an infinite number of simultaneous colors.
The limit to the number of colors which can be simulataneously displayed on a
laptop is determined by the number of bits in the D/A converter which drives
the TFT panel. The more bits available for discrete levels of RGB, the more
simultaneous colors can be displayed.
Robert
--
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| Robert George | Army Research Laboratory |
| robertg@assb01.arl.mil | AMSRL-SS-IC |
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For in much wisdom is much grief: and he that increaseth knowledge increaseth
sorrow.
--Ecclesiastes 1:18