Image sensor capable of controlling reset voltage automatically and control method thereof
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United States of America Patent
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N/A
Issued Date -
Sep 18, 2003
app pub date -
Dec 30, 2002
filing date -
Mar 12, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides an image sensor with an improved automatic control of a reset voltage and a control method thereof. The inventive image sensor includes: An image sensor, comprising: a pixel array unit including a plurality of pixels for detecting optical information inputted from an external environment; an analog line buffer unit that detects and stores voltages of the plurality of pixels in a selected row; and an automatic reset voltage clamping unit for adjusting a clamping voltage value in response to a reset voltage distribution of a pixel output before storing the outputted value from the pixel array unit. The method includes the steps of: comparing a reset voltage signal transmitted from a pixel to a present, a maximum and a minimum clamping voltages and outputting a signal of a first or a second level; counting the signals of the first and the second levels; and comparing the counting results for one frame with each other and adjusting the clamping voltage.
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