You are incorrect, "TFT" screens are very much LCD, sorry.
They work the same way as a monochrome LCD, however instead
of a single transistor turning a monochrome dot on (to occlude the
backlight) or off (to not occlude) a TFT screen has three transisitors
(thin-film transistor) that turns on or off three LCD pixel elements.
Each of the three LCD sub-pixels in a TFT have a red, green, and blue
filter behind to color the white colored backlight.
By adjusting the voltage through each LCD sub-pixel each of the red,
green, and blue filtered light can be adjusted to make various colors.
When an LCD sub-pixel is fully on, it is black, and when it is off, it
is clear, allowing the colored light through.
The reason TFT screens have poor gamut and contrast is becase: 1. the
CCFL tube that makes the bright light dosent have an even color
response spectrum from red to violet, and 2. THe LCD sub-pixels always
leak some light, thus a truly completely dark black is not possible.
As for OLED, Plasma, LED, and CRT, these work the opposite, an on
pixel produces light, rather than occludes an always-on backlight as
in LCD (TFT.)
HTH.
--- In SkunkworksAMA_at_yahoogroups.com, Scrapper Black Dragon
> In this case it a dodgey old CRT system that was probably
> set dim to avoid 'flame out'. Hence when viewed on either
> of the other systems both of which have TFTs. No, they are
> NOT LCDs; LCD is like a digital watch and can't do colour!
Received on Sat Oct 09 2004 - 03:29:12 CDT