While most displays cram in more pixels for higher resolution, the PenTile display actually uses larger subpixels--the bits that compose the RGB stripe of a LCD--and even uses one pixel that is completely clear. The design allows the backlight to shine more light through. It also enables the larger sub-pixels to be more effective since fewer transistors are needed to power the display.
In a typical display, the RGB stripe design of a display panel is inefficient because the density of the pixels blocks the backlight like a curtain. Regular displays also needs more transistors to power a megapixel display; but the transistors also block part of the pixels as well.
Another way the PenTile display saves energy is by not lighting up part of the screen at all. It uses image-processing algorithms to determine the brightness of a scene, and removes backlight where it is not needed. The display, in turn, saves energy and can create higher contrast images.
[Nouvoyance via Technology Review ]
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