Re: Nec SpectraView LCD2180 Wide Gamut LED
Re: Nec SpectraView LCD2180 Wide Gamut LED
- Subject: Re: Nec SpectraView LCD2180 Wide Gamut LED
- From: Graeme Gill <email@hidden>
- Date: Tue, 13 Sep 2005 12:23:44 +1000
stevej wrote:
Sounds unlikely. The whole point of using R/G/B LEDs is that they
emit narrow band light, widening the gamut. White LEDs are broad spectrum
(because they are based on a UV LED with phosphor), very similar to fluorescent
backlight.
Why does it sound unlikely? Don't all backlit displays modify the color of the
light source when the light goes through the LCD color filters? Granted the
current multicolor arrays are well balanced to those color filters, but wouldn't it
be cheaper, in the long run, to produce a broad spectrum LED and let the
LCD filters do their own thing?
The gamut of an emissive display is basically determined by the location
of the primaries. The purer the primaries, the larger the triangle
(measured on a CIE x y diagram) enclosed. Ideal primaries are therefore
lasers. LEDs aren't lasers, but they are relatively narrow band
light sources. Some of the phosphors have quite narrow peaks
that make them a good light source for emissive displays, but
in general they don't seem to be as narrow band or overall as
pure as LEDs. The LCD displays do have filters, but as is the case
with reflective display technology, it's hard to make narrow band
filters, and if you do manage it, you would loose a lot of light
when filtering a wideband source.
Graeme Gill.
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