Sharp LCD uses photodiode in every pixel to take fingerprints

Bush, Steve
February 2007
Electronics Weekly;2/14/2007, Issue 2275, p8
Trade Publication
The article reports that Sharp Electronics Corp. has produced a liquid crystal display (LCD) that also acts as a fingerprint and touch sensor. Key to the operation of the 64mm 640x480 display/sensor is a photodiode tucked away in every pixel, with a space-saving one-transistor read circuit alongside which wastes only 18% of the pixel aperture. The sensor is suitable for reading anything that is placed in contact with the display. INSET: One-transistor readout.


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