LCD Displays?

[zogg]

Thats intresting. What could have stopped them from making it 
non-monochrome in daylight?

Tim Schmidt wrote:
> On Thu, May 21, 2009 at 9:12 AM, zogg <zoggified at gmail.com> wrote:
>   
>> Looks like LCD for indoors are common, and for outdoors theres scarcity.
>> So, do you know any manufacturers, or at least in what direction should
>> i try and look at?
>>     
>
> The OLPC has an LCD which is very easy to read in daylight.  When
> backlit, it appears as a color LCD, but when frontlit (as from the
> sun), it appears greyscale.  This is a function of the OLPC's very
> efficient backlight system (instead of using colored filters to block
> out 66% of the light from the white backlight for each pixel, they use
> a fresnel prism to split the backlight into it's component wavelengths
> on pixel boundaries.  Thereby allowing nearly 100% of the light
> produced by the backlight through to your eyes, as opposed to less
> than 33% for typical LCDs.  Light from the front of the LCD passes
> through the pixels, and is reflected by a silvered layer, back through
> the pixels to your eyes, never passing through the prism, so what
> would normally be colored sub-pixels appear as greyscale pixels.
>
> --tim
>
> _______________________________________________
> Openmoko community mailing list
> community at lists.openmoko.org
> http://lists.openmoko.org/mailman/listinfo/community
>
>