Thin film transistor type optical sensor
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United States of America Patent
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Oct 11, 2005
Grant Date -
Nov 11, 2004
app pub date -
Jun 16, 2004
filing date -
Jan 20, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A image detector comprises a light source for radiating light in accordance with a predetermined signal; a window for transmitting the light from the light source; a thin film phototransistor for generating an optical current in accordance with the intensity of external light; a storage capacitor for storing charge information transmitted from the thin film phototransistor; a thin film switching transistor for outputting the information stored in the storage capacitor in accordance with an external control signal; an insulating layer for covering the window, the thin film phototransistor, the storage capacitor, and the thin film switching transistor; a protecting layer formed on the insulating layer; and a conductive object detection pattern formed on the protecting layer to apply an electrical power supply signal to the light source when a conductive living object contacts the conductive objecting detecting pattern.
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