Re: Does your TV heat your face or warm your room?


"The best way to light a display would be to make each pixel
an LED of the right color.  I'm surprised over all the fuss
about using LEDs as white back lights for LCD panels, as
that also reduces their efficacy by about 90%.  Better to
use them as the pixels."

Hence the development of the OLED display technology. I think using
LEDs as a backlight is an interim step until they can get the OLEDS
bright enough and can scale the manufacturing to bring screen sizes up
and costs down on the OLEDs. The prototype OLED displays I saw at CES
this year were beautiful and you could buy the 11" display from Sony
for , if I recall, a mere $10,000.

The LED backlights offer some key advantages over the fluorescent
backlights in terms of energy efficiency,picture quality, and source
lifetime. The LEDs have a smaller optical extent and are better
suited to edge lit designs where a lightguide is used instead of a
direct lighting array. Also the colored nature of the LEDs means they
can have higher overall efficiencies because the pixel filters arent'
cutting white light, but light that is already colored. If you design
the display engine to display colors sequentially at high frequencies
then you can use the LEDs sequentially also possibly gaining more
efficiency. Color gamut may also be improved using LEDs as opposed to
a fluroescent spectrum.

For the direct view designs in addition to the sequential display
design possibility, there is the potential for localized darkness and
brightness control to enhance the picture which results in higher
perceived picture quality. All of this comes at a pretty high cost
though, so I'm guessing that adoption will be quite slow in the larger
market.






.

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