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RE: Extremely good news: Kopin 320M Display Drivers

Good luck! A View Master backlighting scheme may work - marginally.  The
LCD is about 2-4% efficient while a slide is much higher.  You will need
a bright light behind the LCD it to even see a picture.  Secondly this
light should be as diffuse as possible to give you an even brightness
over the entire LCD.  Hot spots seriously degrade the quality of the
image.  

Just looking at the sun won't do the trick either: 1) It's dangerous to
do that 2) the contrast ratio will approach 1:1 as you increase the
brightness of the backlight to the sun's intensity - leaving you with a
completely white image.

The LED is a super small "grain of sand" LED and is not really the place
to be looking to in order to minimize the over all size of the system.
The diffusing/light shaping box can be omitted if you include it in the
design of your housing.  By eliminating the diffusing box, you can
reduce the volume of the system dramatically while still retaining the
ability to control the backlight.

-Tony

> -----Original Message-----
> From:  [mailto:] 
> Sent: Tuesday, August 26, 2003 7:24 PM
> To: 
> Cc: 
> Subject: Re: Extremely good news: Kopin 320M Display Drivers
> 
> 
> > I'm leaning towards an open air design, using just a lens, beam
> > splitter, and
> > diffuser for the led. I may try to incorporate a polarizer 
> or two to 
> 
> Just out of curiosity, why are you using an LED backlight?  
> While I've not seen them turned on, these LCDs are 
> transparent, like a photographic slide.  Wouldn't using 
> existing light as a light source be the best solution, 
> potentially coupled with a small LED for nighttime use?  It'd 
> minimize power use, too...gets rid of one more device.
> 
> It wouldn't be too hard to rig something up, for a proof of 
> concept model.
> 
> Keep in mind, even on an overcast day, the sun provides MORE 
> than enough light for practically any activity.
> 
>      -- Chuck Knight
> 
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