Re: question on LED-backlit displays
Re: question on LED-backlit displays
- Subject: Re: question on LED-backlit displays
- From: Robin Myers <email@hidden>
- Date: Sun, 17 Jun 2007 08:56:53 -0700
On Jun 17, 2007, at 07:49 , Roger Breton wrote:
On 6/16/07 6:55 PM, "Robin Myers" wrote:
Backlights using individual high brightness red, green and blue LEDs
are possible, but they present a very challenging task to the
optical
designer to get the light to mix evenly in the narrow confines of a
display.
Isn't the NEC Wide Gamut using three colored LEDs? That was my
understanding.
Andrew Rodney
Same here. That's what a Phillips display engineer told me (he said
that
Phillips own the LumiLED technology used in the NEC display) last
fall at
CIC.
Roger Breton
My statement was that they were challenging to make, not impossible.
To try this out for yourself, get three individual pocket
flashlights, one each with red, green and blue LEDs and try to get
the three lights to blend evenly in a SHORT distance. The NEC-
Mitsubishi uses a Luxeon DCC RGB array to offer a tunable light
source. This display also required a special light guide, I suspect
to mix the individual R, G, and B LED outputs into an evenly
distributed white light illumination. If it was easy every other LCD
manufacturer would also be offering backlights with individual RGB
LEDS. That is why my first statements about MOST LED backlit LCD
panels using white LEDs is still true.
Robin Myers
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