期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 42, 期 12, 页码 2904-2912出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2007.908695
关键词
CMOS APS; image sensors; liquid crystal displays (LCDs); thin-film transistors (TFTs)
In this paper, we describe a continuous-grain silicon-system LCD with integrated optical input function for application in next-generation mobile devices. The optical input function, which may be used for touch input or fingerprint-recognition applications, is achieved by integrating image-sensor elements within each display pixel. By using a one-transistor (1T) active pixel sensor, we have successfully integrated a 30 Hz, 300 dpi VGA image sensor within an LCD panel with an aperture ratio of 40%. Power consumption and circuit area in the panel are minimized through the use of a source driver circuit which combines the functions of both display and sensor.
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