zoggified at gmail.com
Thu May 21 10:01:56 CEST 2009
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.
> Openmoko community mailing list
> community at lists.openmoko.org
More information about the community