timschmidt at gmail.com
Thu May 21 09:22:07 CEST 2009
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.
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