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A circuit and system for eliminating dark current using a slope generator

A ramp generator and dark current technology, applied in the parts, televisions, electrical components and other directions of the TV system, which can solve the problems of increasing the dark current value and reducing the dynamic range of the image.

Active Publication Date: 2021-04-16
CHENGDU LIGHT COLLECTOR TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Since when the image sensor system counts the average value of the signal of the dark pixel array, the digital output is not 0 and changes with the change of temperature, the use of the above ramp generator for dark current correction will lead to a decrease in the dynamic range of the image, especially Under high temperature conditions, the dark current value increases

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  • A circuit and system for eliminating dark current using a slope generator
  • A circuit and system for eliminating dark current using a slope generator
  • A circuit and system for eliminating dark current using a slope generator

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Embodiment Construction

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clear, the specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings; And it is only used to facilitate and clearly achieve the purpose of assisting in describing this embodiment.

[0043] Please refer to the attached Figure 4 , a ramp generator circuit in a dark current elimination circuit using a ramp generator provided in the present invention, in the traditional ramp generator circuit architecture, a correction module is added, specifically, the ramp generator circuit includes : reset capacitor Cf, calibration capacitor Cs, reset switch S7, calibration switch S5, eighth switch S8, sixth switch S6, calibration module and operational amplifier.

[0044] The correction switch is controlled by the Vdark_ctrl signal, the sixth switch is controlled by the Vdark_ctrlb signal, and the Vdark_ctrl signa...

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Abstract

The invention discloses a circuit and system for eliminating dark current using a new type of slope generator. In the traditional slope generator, the second input terminal of the comparator is connected in parallel with a correction module and a correction capacitor. The average digital value of the dark current noise of the dark pixel is obtained, and this digital value is fed back to the correction module. When reading out the effective pixel, since the correction module records the noise level of the dark current and superimposes it in the ramp signal, the readout of the effective pixel The output data does not contain dark current noise. This architecture effectively eliminates dark current noise, reduces the reduction of the dynamic range of the image sensor caused by dark current, and effectively improves the image quality of the image sensor.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a circuit and system for eliminating dark current using a slope generator. Background technique [0002] In the CMOS image sensor (CIS), the dark current seriously affects the image quality of the image sensor. The influence of the dark current on the imaging quality of the image sensor is mainly reflected in two aspects. First, the non-uniformity of the dark current is fixed in the CIS. An important source of pattern noise, which makes the permeability of the image sensor worse; second, the dark current will push up the average value of the entire image, especially at high temperatures, the dark current value increases significantly, making the dynamic range of the image Although the inherent dark current of the photodiode can be reduced in the manufacturing process and the uniformity can be improved, it is still necessary to eliminate or suppress the dark current no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/361H04N5/357H04N5/335
CPCH04N25/00H04N25/60H04N25/63
Inventor 高菊蔡化陈飞芮松鹏陈正张风体
Owner CHENGDU LIGHT COLLECTOR TECH
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