Google Nexus One and HTC Supersonic 4G smartphone heading to Sprint

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Screen door effect

The screen door effect is a form of pixilation that occurs in digital projectors. Digital projectors display their images through pixels (or mirrors in the case of DLPs). Each, individual pixel is controllable. But, the complicated electronics that control each pixel surround the pixel itself. So, if the display’s projection lens is focused sharply enough, you can actually see this “control circuitry around each pixel. It shows up as black lines, much like you’d see looking through a screen door. To fix it manufacturers can reduce the size of the pixels themselves (and hence increase their total number) or they can defocus the projector lens slightly.

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