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: Sat, 16 Jun 2007 19:03:02 -0700
On Jun 16, 2007, at 18:37 , Marco Ugolini wrote:
In a message dated 6/16/07 5:55 PM, Robin Myers wrote:
Although single LED devices containing red, green and blue individual
dies have been around for many years, they are not as bright as the
white LEDs, so they are not usually used for backlights. High
brightness LEDs are needed because the LCD they are backlighting
greatly cuts the backlight intensity down before it gets out for us
to view.
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.
So, "white" LEDs offer no advantages over fluorescent backlights as
far as
controlling the color temperature of the light source is concerned,
do they?
I'm disappointed, because what I have kept hearing so far is how we
were
going to be able to control the color temperature of the light
source once
we have LCD displays with LED backlights. It appears that the story
may not
be quite as simple as that.
Marco Ugolini
Only LED backlights with individually controllable red, green and
blue (and possibly more) LEDs will allow for tunable backlight white
points. Otherwise the display is tunable just like fluorescents, by
varying the intensities of the color filters in the LCD.
Robin Myers
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