Quote:
Originally Posted by pdurrant
It does have a built-in light, but it's a front-light. Like eInk, the Mirasol display is opaque. A back-light doesn't work.
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From this article :
https://www.technologyreview.com/computing/39135/?p1=A1
"The Mirasol display makes color in the same way as the wings of iridescent butterflies or peacock feathers—by being an imperfect mirror that tunes the color of incoming light before reflecting it back to the viewer.
In a Mirasol display, this is done by small cavities known as interferometric modulators, tens of microns across and a few hundred nanometers deep, beneath the display's glass surface. "It's the air gap between the back of that glass and a mirror membrane at the bottom of the modulator that sets the color," says Chui. Each modulator's mirror membrane can snap upward against the glass when a small voltage is applied, closing the cavity and displaying a black color to the viewer. Mirasol modulators are made using techniques similar to those used to pattern metals and deposit materials in computer chip manufacturing.
Modulators come in three types: for red, green, and blue. Each pixel in a Mirasol display is actually made up of several modulators that display the three basic colors at different brightness levels. Switching these modulators on and off in the right combination offers full color at different brightness. In dark conditions, light is directed onto the panel's modulators from LED lights at the edge of the panel."