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US 2015/0092086 A1Published application
Cmos image sensor system and method thereof
AssigneeuChange Technology Co., Ltd.
InventorsChih-Tsung CHANG, Jyun-Jie SIE
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Abstract
A complementary metal-oxide semiconductor (CMOS) image sensor system and method thereof produce a control signal to make a input terminal repeatedly switch between high potential and low potential, thereby modulating image signals at a specific frequency to prevent image quality from being affected by direct current (DC) voltage variations. The mechanism thus helps improving the image quality.
Claims13
A complementary metal-oxide semiconductor (CMOS) image sensor system, comprising:
- a controlling unit for generating a control signal for a input terminal to repeatedly switch between a high potential and a low potential;
- a sensor array consisting of at least one active pixel sensor unit, each of which generates a direct current (DC) signal and an alternating current (AC) signal according to the high/low potential of the input terminal after detecting light and generating charges, the DC signal and the AC signal being output to a column output;
- and
- a signal processing module electrically connected with the sensor array for filtering out the DC signal and receiving only the AC signal from the column output to avoid DC voltage variations and noise interference, and for processing the AC signal to generate an image signal.
1 more element
A CMOS image sensor method, comprising the steps of:
- generating a control signal for a input terminal to repeatedly switch between a high potential and a low potential;
- generating a DC signal and an AC signal according to the high/low potential of the input terminal after detecting light and generating charges, and outputting the DC signal and the AC signal to a column output;
- and
- filtering out the DC signal and receiving only the AC signal from the column output to avoid DC voltage variations and noise interference, and processing the AC signal to generate an image signal.
1 more element
Dependencies are inferred from the claim text.