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Image sensor dark level correction structure and method

An image sensor and correction method technology, applied in image communication, television, electrical components, etc., can solve problems such as affecting image quality and reducing signal-to-noise ratio, to eliminate dark level signals, reduce processing time, and shorten dark level. effect of time

Active Publication Date: 2022-03-18
四川创安微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to distinguish between the dark current and the charge generated by light, which is finally read out by the image sensor and presented in the image, which leads to a decrease in the signal-to-noise ratio and affects the image quality

Method used

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  • Image sensor dark level correction structure and method
  • Image sensor dark level correction structure and method

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Experimental program
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Embodiment 1

[0036] This embodiment provides an image sensor dark level correction structure, such as figure 1 As shown, the dark level correction structure includes: a pixel module 11, a digital-to-analog converter 12, a reference voltage generator 13, a comparator 14, a counter 15, a digital module 16, an output module 17, a switch A and a switch B;

[0037] Switch A is provided in the input stage 141 of the comparator 14;

[0038] The output terminal of the pixel module 11 is connected to the negative phase input terminal of the comparator 14, the output terminal of the digital-to-analog converter 12 is connected to the positive phase input terminal of the comparator 14, and the output terminal of the reference voltage generator 13 is connected to the positive phase input terminal of the comparator 14 terminal, the comparator 14 , the counter 15 , the digital module 16 , and the output module 17 are connected sequentially, and the digital module 16 is connected to the input terminal of ...

Embodiment 2

[0066] Corresponding to the correction structure of the image sensor dark level in Embodiment 1, this embodiment provides a method for correcting the dark level of the image sensor. In this method, the dark pixel signal is read first, and then the effective pixel signal is read. The dark level semaphore will be automatically subtracted through the analog comparison operation when the effective pixels are read, and it is not necessary to perform dark level correction after the entire frame is read, so the processing time can be reduced. Figure 6 It is a flow chart of a method for correcting the black level of an image sensor provided in this embodiment. As shown in the figure, the dark level correction method includes the following steps:

[0067] S1, read the voltage value of the pixel signal and the ramp signal, and input it to the comparator;

[0068] Specifically, the pixel signal is a dark pixel signal or an effective pixel signal, the operation period of the dark pixel ...

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Abstract

The invention discloses an image sensor dark level correction structure and method, and the method comprises the steps: S1, reading the voltage values of a pixel signal and a ramp signal, and inputting the voltage values into a comparator; s2, in a dark pixel row period, setting a reference voltage, and outputting a value which is a CDS value of a dark pixel signal after a comparator is overturned twice; s3, the digital module converts the output value in the step S2 into a level value delta V, and feeds back the dark level signal to the reference voltage generator; s4, in the effective pixel row period, the reference voltage is set again, and after the comparator is overturned twice, the output value is the CDS value of the effective pixel signal; and S5, the digital module directly outputs the effective pixel signals in the step S4 through an output module. The method can effectively shorten the dark level correction time of the image sensor.

Description

technical field [0001] The present invention relates to the technical field of image sensors, in particular to a dark level correction structure and method of an image sensor. Background technique [0002] Physical devices are affected by various reasons such as impurities and heat. Even when there is no light shining on the pixel, the pixel unit will generate charges, and these charges will generate dark current. It is difficult to distinguish the dark current from the charge generated by light, which is finally read out by the image sensor and presented in the image, which leads to a decrease in the signal-to-noise ratio and affects image quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to eliminate the influence of the dark level on the image sensor. The object of the present invention is to provide a dark level correction structure and method of an image sensor, which can improve image quality. [0004] The pr...

Claims

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Application Information

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IPC IPC(8): H04N5/361
CPCH04N25/63
Inventor 不公告发明人
Owner 四川创安微电子有限公司