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Output method of pixel sensitivity value

An output method and technology of photosensitive value, applied in the field of image sensor, can solve the problem that FPN cannot be effectively eliminated, and achieve the effect of eliminating fixed pattern noise and improving image quality

Active Publication Date: 2020-08-28
GALAXYCORE SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this method can eliminate the FPN introduced by the readout circuit, it still cannot effectively eliminate the FPN introduced by the timing.

Method used

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  • Output method of pixel sensitivity value
  • Output method of pixel sensitivity value
  • Output method of pixel sensitivity value

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] figure 2 is a timing diagram of a method for outputting a pixel sensitivity value according to Embodiment 1 of the present invention.

[0058] Such as figure 2 As shown, the RST signal is the reset control signal of the pixel photosensitive unit, the TX signal is the exposure transmission control signal of the pixel photosensitive unit, and ramp is the ramp signal generated by the ramp generating circuit.

[0059] First, the RST signal controls the pixel units of each column to reset for the first time, and then the TX signal controls the pixel units of each column to be exposed for the first time. The first exposure time T1 is the normal exposure time, and the pixel units of each column output the first photosensitive voltage respectively. The ramp generating circuit generates a first ramp signal, and the counter starts counting from zero. As the first ramp signal gradually increases, the voltage difference between the first ramp signal and the first photosensitive ...

Embodiment 2

[0064] image 3 It is a timing diagram of the pixel sensitivity value output method according to the second embodiment of the present invention.

[0065] Such as image 3 As shown, the RST signal is the reset control signal of the pixel photosensitive unit, the TX signal is the exposure transmission control signal of the pixel photosensitive unit, and ramp is the ramp signal generated by the ramp generating circuit.

[0066] Firstly, the RST signal controls the pixel units in each column to reset for the first time, and the pixel units in each column output the first reset voltage respectively. The ramp generating circuit generates a first ramp signal, and the counter starts counting from zero. As the first ramp signal gradually increases, the voltage difference between the first ramp signal and the first reset voltage gradually decreases. When the When the first ramp signal exceeds the first reset voltage, the comparator is triggered to reverse, and the count value of the c...

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Abstract

The invention provides a method for outputting the photosensitive value of a pixel. The pixel photosensitivity value output method of the present invention adds a short exposure with an exposure time shorter than the normal exposure time in addition to the normal exposure, and effectively eliminates the pixel unit readout through the differential output of the normal exposure and the short exposure of each column of pixel units. The fixed pattern noise introduced by the output circuit and timing further improves the image quality.

Description

technical field [0001] The invention relates to the field of image sensors, in particular to a method for outputting light-sensing values ​​of pixels. Background technique [0002] At present, image sensors mainly include CCD image sensor (Charged Coupled Device) and CMOS image sensor (CMOS Imaging Sensor, CIS). Compared with CDD image sensors, CMOS image sensors have the advantages of low power consumption, low noise, wide dynamic range, small size, and low cost. Therefore, CMOS image sensors have gradually become a research and development hotspot in this technical field. [0003] The Analog-to-Digital Converter (ADC) is an important part of the CMOS image sensor, used to convert the analog signal generated by each pixel unit into a digital signal, and is the interface between the analog circuit and the digital circuit. [0004] The existing CMOS image sensors mainly use three types of ADCs, namely: chip-level ADC, column-parallel ADC and pixel-level ADC. Chip-level ADC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/365H04N5/378
CPCH04N25/67H04N25/75
Inventor 赵立新乔劲轩董小英
Owner GALAXYCORE SHANGHAI
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