|
Technical issues
On e-ink's site they differentiate between active matrix displays as those where each pixel can be changed (with a Thin-Film Transistor behine each one, hence the TFT reference you often see), and segmented displays, where the segments to turn on-and-off are predefined (like the LEDs forming the numerals on your radio alarm clock). You have to have an "active matrix"-type display if you want to be able to turn any pixel on or off. The difference between e-ink and LCD is that LCD pixels have to be refreshed, with a raster scan constantly going through the graphics memory and sending the correct signals to the display; e-ink requires no refreshing since the e-ink capsules are bistable and stay the way you set them. That's the main reason e-ink saves so much power.
|