Re: LED Apparent Brightness

On Mon, 09 May 2005 15:05:21 -0700, John Larkin wrote:
> On Mon, 09 May 2005 14:13:16 -0700, Charlie Edmondson
>>>
>>There is only one good reason to pulse a light source to get brighter
>>illumination when multiplexing is not needed... if you are matching to a
>>shuttered imager. I had an application that I was developing, in which
>>we were going to use an IR filter in front of a standard CMOS imager,
>>adn then use a pulsed IR source with a short pulsewidth matched to an
>>equally short shutter time on the camera. By sync'ing these together,
>>the IR illuminator could be the predominate light source, overpowering
>>even daylight, while still maintaining eye safety.
>
> Too bad LCDs are so slow. The ideal backlight would be sequentially
> pulsed R-G-B led's.

But, um, is it seriously unrealistic to contemplate a panel of RGB LEDs,
say, 640 x 480, all by themselves, being pixels? Like a micro-jumbotron?
Frankly, I've been wondering about that ever since I started reading about
the various technologies that have been studied for making flat-screen
displays. Is it just that it would be so prohibitively expensive?

Thanks,
Rich

.

Relevant Pages

  • Re: Low cost vision system, thoughts
    ... i.e. illumination with an incandescent ... and color response of the imaging device. ... or another type of light source without a different ... ratios, if you have more yellow light, your objects look yellow. ...
    (comp.robotics.misc)
  • Newbie needs help
    ... glasses on a mirror to piano keys...Have had lots of fun playing around ... sitting inside a light tent? ... what style of illumination would I need to use to 'light' the ... for tungsten but would it work as well as using a purer light source? ...
    (alt.photography)
  • Re: LED Apparent Brightness
    ... >>>illumination when multiplexing is not needed... ... >>>the IR illuminator could be the predominate light source, ... Not many led's, lots of lcd pixels. ... Instead of having a pixel per color, each lcd pixel would handle all ...
    (sci.electronics.design)
  • Re: LED Apparent Brightness
    ... >illumination when multiplexing is not needed... ... >we were going to use an IR filter in front of a standard CMOS imager, ... >the IR illuminator could be the predominate light source, ... pulsed R-G-B led's. ...
    (sci.electronics.design)
  • Re: LED Apparent Brightness
    ... >>>illumination when multiplexing is not needed... ... >>>equally short shutter time on the camera. ... >>>the IR illuminator could be the predominate light source, ... The other way, with three LEDs per pixel, you've got to send ...
    (sci.electronics.design)
Loading