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Pixel circuit and driving method thereof and image sensor

A technology of pixel circuit and image processor, applied in image communication, TV, electrical components, etc., can solve the problem of inaccurate detection results, achieve the effect of accurate detection and improve the accuracy of recognition

Active Publication Date: 2018-08-17
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in practical applications, it is found that during the exposure sampling stage, due to the leakage current in the reset transistor, the leakage current will also have a certain impact on the voltage of the signal collection point, resulting in inaccurate detection results

Method used

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  • Pixel circuit and driving method thereof and image sensor
  • Pixel circuit and driving method thereof and image sensor
  • Pixel circuit and driving method thereof and image sensor

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Embodiment Construction

[0063] In order for those skilled in the art to better understand the technical solution of the present invention, a pixel circuit, a driving method thereof, and an image sensor provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0064] In the present invention, each transistor includes three poles: a control pole, a first pole and a second pole, wherein the control pole refers to the gate of the transistor, the first pole and the second pole are respectively the source and the drain, and the second pole is the gate of the transistor. The first and second poles are interchangeable.

[0065] image 3 A schematic circuit structure diagram of a pixel circuit provided in Embodiment 1 of the present invention, as shown in image 3 As shown, the pixel circuit is used to provide a voltage signal to an external image processor, and the pixel circuit includes: a reset transistor M rst , a photoelectric converter PD, a sou...

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Abstract

The invention discloses a pixel circuit and a driving method thereof and an image sensor. The pixel circuit comprises a reset transistor, a photoelectric converter, a source follower module and a detection compensation module, wherein a control pole of the reset transistor is connected to a reset signal line, a first pole of the reset transistor is connected to the detection compensation module, and a second pole of the reset transistor, a first pole of the photoelectric converter and the source follower module are connected to a signal acquisition point. According to the scheme of the invention, the detection compensation module detects a leakage current of the reset transistor in a cut-off state and generates a corresponding compensation signal for compensating for the voltage variationcaused by the leakage current at the signal acquisition point, and thus the accurate detection of a voltage signal at the signal acquisition point can be implemented, and the improvement of the recognition accuracy of the image sensor can be facilitated.

Description

technical field [0001] The invention relates to the technical field of image acquisition, in particular to a pixel circuit, a driving method thereof, and an image sensor. Background technique [0002] Complementary Metal Oxide Semiconductor (CMOS) image sensors are widely used in digital cameras, mobile phones, Medical equipment, automobiles and other occasions. [0003] Wherein, the CMOS image sensor generally includes several pixel units (Pixels), and each pixel unit is provided with a corresponding pixel circuit. figure 1 It is a schematic circuit structure diagram of a pixel circuit in the prior art, such as figure 1 As shown, the pixel circuit includes: a reset transistor, a photodiode and a source follower module; wherein, the reset transistor, the photodiode and the source follower module are connected to the signal collection point. The photodiode is used to collect incident light and generate a corresponding electrical signal, and the source follower module is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/359H04N5/374
CPCH04N25/62H04N25/766H04N25/76
Inventor 郑智仁王鹏鹏刘伟丁小梁韩艳玲曹学友张平
Owner BOE TECH GRP CO LTD