In article ,
Dave Plowman (News) wrote:

Who says fluorescent is inefficient? LED could be better if you could turn
off those in the dark parts of the picture - but no claims for that.

A video engineer I know, recently told me that some of the new
LED-backed-LCD displays do just that.

If I understand him correctly: these displays use a large matrix of
addressable R/G/B LEDs, with each LED illuminating the back size of a
set of LCD pixels. The actual visual brightness seen by the viewer,
for each individual pixel, depends both on the level of LED
back-illumination for that pixel, and the transparency of the LCD
pixel... both of which can be controlled by the display electronics.

By turning down (or off) the LED which back-illuminates a set of
pixels, the display can generate a *very* "deep black" in that area
when called for... these displays have a much higher maximum contrast
ratio than a traditional CFL-backlit LCD display.

This approach can save power, too, during times of low average screen
brightness.

These aren't OLED displays (which are still expensive for their
size)... the LEDs are of fairly standard inorganic construction.

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
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