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Active type pixel sensor circuit and its operation method

A pixel sensor, active technology, used in TV, electrical components, image communication, etc., can solve the problems of increased power consumption of displays, increased size of photodiodes, reduced aperture ratio of displays and unit light penetration, etc., to improve Sensitivity, the effect of reducing power consumption

Active Publication Date: 2009-08-26
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third factor is the effect of the charge of the sense amplifier on the voltage gain
However, increasing the size of the photodiode 2 and / or readout transistor 4 will reduce the aperture ratio of a display and the light transmission of the cell
Under the condition that the brightness of the display needs to be maintained at a certain level, the brightness of the backlight illuminating the display must be increased, resulting in an increase in the power consumption of the display

Method used

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  • Active type pixel sensor circuit and its operation method
  • Active type pixel sensor circuit and its operation method
  • Active type pixel sensor circuit and its operation method

Examples

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Embodiment Construction

[0074] see figure 1 , which is a schematic diagram of an active pixel sensor circuit 100 according to an embodiment of the present invention. In this embodiment, the active pixel sensor circuit 100 includes a reset line 111 for providing a reset signal RESET, a column selection line 113 for providing a column selection signal ROW SELECT, and a row selection line 113 for providing a first A first supply voltage line 115 for supplying voltage VREF, a second supply voltage line 117 for providing a second supply voltage VDD, and a row readout line 119 for outputting a photoelectric signal.

[0075] The active pixel sensor circuit also includes a reset transistor 120 having a gate 122 electrically coupled to the reset line 111 , a source 124 and a drain 126 electrically coupled to the first supply voltage line 115 . a photodiode 140 having an anode 142 electrically coupled to the column select line 113, and a cathode electrically coupled to the source 124 of the reset transistor ...

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Abstract

The invention relates to an active type pixel sensor circuit and its operation method. The active type pixel sensor circuit comprises reset transistor, highly oxidized silicon optical sensor and read-out transistor. The reset transistor has grid, source and drain; the highly oxidized silicon optical sensor has anode and cathode and the anode and cathode are electrically coupled to source of reset transistor; the read-out transistor has source, drain and grid which is electrically coupled to cathode of high oxidized silicon optical sensor.

Description

technical field [0001] The present invention relates to an active pixel sensor, in particular to an active pixel sensor circuit, which utilizes a dual-transistor design to improve aperture ratio and sensitivity. Background technique [0002] In general, a CMOS active pixel sensor utilizes an amplifier built in each pixel to amplify the photoelectric signal (or photovoltaic signal) generated by the photosensor in response to light irradiation, which can be determined according to the intensity of each pixel. X-Y address to selectively read. For this CMOS active pixel sensor, the photoelectric signal is amplified by a built-in amplifier before being transmitted to an external control circuit, thereby reducing noise during the signal transmission. [0003] The sensitivity of an active pixel sensor is generally determined by at least three factors. The first factor concerns the area in the active pixel sensor available to convert photons to electrons. Increasing this area res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/146H04N3/14
CPCH04N5/374H04N25/76
Inventor 庄铭宏卓恩宗
Owner AU OPTRONICS CORP
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