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Active pixel sensor, driving circuit and driving method

A technology of pixel sensor and driving circuit, applied in circuits, televisions, electrical components, etc., can solve the problems of different photoelectric currents, image distortion, etc., and achieve the effect of improving accuracy

Active Publication Date: 2017-01-18
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The voltage drop Vth between the gate and source of different source followers is different, so under the same illumination, the photoelectric current generated by the active pixel sensor may be different, so that the camera generates different pixel values ​​according to the photoelectric current, and the captured image picture distortion

Method used

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  • Active pixel sensor, driving circuit and driving method

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Effect test

Embodiment 1

[0063] see figure 1 , an embodiment of the present invention provides a driving circuit for an active pixel sensor, the driving circuit includes: a reset module 1, a photoelectric sensing module 2, a signal forming module 3, a driving module 4, and a signal output module 5;

[0064] The reset module 1 is connected to the first voltage terminal Vcom, the reset signal terminal Reset, the photoelectric sensor module 2, the signal forming module 3 and the drive module 4, and is used to set the first voltage terminal under the control of the reset signal of the reset signal terminal Reset. The first voltage signal of Vcom is transmitted to the photoelectric sensing module 2 and the signal forming module 3;

[0065] The photoelectric sensor module 2 is also connected to the ground terminal, the first control signal terminal Scan1 and the signal forming module 3, and is used to discharge to the ground terminal under the control of the first control signal of the incident light irradi...

Embodiment 2

[0107] An embodiment of the present invention provides an active pixel sensor, and the active pixel sensor includes any driving circuit provided in the first embodiment.

[0108] In the embodiment of the present invention, since the active pixel sensor includes the driving circuit provided in Embodiment 1, and because in the driving circuit, the signal forming module converts the photoelectric voltage signal V 1 The gate voltage signal V is formed through the driving module 2 =V 1 -V th , the second voltage terminal inputs the second voltage signal V to the driving module dd , so that the drive module forms a photoelectric current signal I=K(V GS -V th ) 5 =K[V dd -(V 1 -V th )-V th ] 2 =K(V dd -V 1 ) 2 , so the formed photoelectric current signal is not affected by the voltage drop V of the driving module th To avoid the problem of picture distortion of the captured image.

Embodiment 3

[0110] see Figure 9 , an embodiment of the present invention provides a driving method of an active pixel sensor, the driving method comprising:

[0111] Step 201: In the reset stage, the reset signal terminal outputs a reset signal, and under the control of the reset signal, the first voltage signal at the first voltage terminal is transmitted to the signal forming module and the photoelectric sensing module.

[0112] Step 202: In the photo-sensing accumulation stage, the first control signal terminal outputs a first control signal, and the photoelectric sensing module discharges to the ground terminal under the irradiation of incident light and the control of the first control signal, and forms a photoelectric voltage signal after discharge.

[0113] Step 203: In the discharge stage, the second control signal terminal outputs a second control signal, and under the control of the second control signal, the signal forming module transmits the photoelectric voltage signal to t...

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Abstract

The invention discloses an active pixel sensor, a driving circuit and a driving method. The driving circuit comprises a resetting module for transmitting the first voltage signal of a first voltage terminal to a photoelectric induction module under the control of the resetting signal of a resetting signal terminal; the photoelectric induction module for discharging power to the grounding terminal and afterwards forming a photoelectric voltage signal under the irradiation of incident light and the control of a first control signal from a first control signal terminal; a signal forming module for transmitting the photoelectric voltage signal to the driving module under the control of a second control signal from a second control signal terminal; a signal outputting module for transmitting a second voltage signal of a second voltage terminal to a driving module; and the driving module for forming a gate voltage signal according to the photoelectric voltage signal and forming a photoelectric current signal according to the gate voltage signal and the second voltage signal. The present invention can avoid the problem that a captured image picture is distorted.

Description

technical field [0001] The invention relates to the display field, in particular to an active pixel sensor, a driving circuit and a driving method. Background technique [0002] A camera is a device that has the ability to take video or take still images. The camera includes an active pixel sensor, and when the camera captures an image, the camera senses light through the active pixel sensor. The active pixel sensor converts the sensed light into photoelectric current, and the camera converts the photoelectric current into the pixel value of the pixel point and saves it in the image file, thus forming an image. [0003] The active pixel sensor includes components such as a photodiode and a source follower. The anode of the photodiode is connected to the first voltage terminal, and the cathode is connected to the gate of the source follower; the source of the source follower is connected to the second voltage terminal, and the drain is connected to the second voltage termina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/02H01L27/146
CPCH01L27/0207H01L27/14601H01L27/14643H04N25/77H04N25/616H04N25/771H04N25/60H04N25/76
Inventor 杨盛际董学吕敬陈小川王磊刘冬妮卢鹏程付杰肖丽岳晗
Owner BOE TECH GRP CO LTD