SENSOR AND INPUT DEVICE SUCH AS A TOUCH SCREEN INCLUDING SUCH A SENSOR, DISPLAY DEVICE AND METHOD
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United States of America Patent
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Issued Date -
Sep 25, 2014
app pub date -
Mar 20, 2014
filing date -
Mar 22, 2013
priority date (Note) -
Abandoned
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Abstract
A sensor includes a linear array of sensitive photodetectors each forming part of an associated pixel circuit. The pixel circuits accumulate photo-generated charge from their photodetectors simultaneously but with different gains for different pixels. Each pixel circuit comprises an operational amplifier arranged to integrate a photocurrent received from the photodetector over a sampling interval that is substantially the same for all pixels. The gain of each pixel circuit is made variable over time by switching one or more capacitors in and out of the integrating circuit. In one embodiment a gain selection signal is written into each pixel circuit during a data read-out cycle. In another embodiment, the gain of each pixel varies automatically in response to data obtained from the pixel in a previous cycle. Several similar sensors are used to detect touch positions in a touch screen input device.
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