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Signal processing circuit and method for pixel array and image sensor

A signal processing circuit and pixel signal technology, applied in the field of image sensors, can solve the problem of limited noise reduction effect

Active Publication Date: 2020-01-21
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology

However, since the noise interference of the pixel array changes with time, and the image sensor samples the dark pixel signal and the active pixel signal at different time points, the noise information carried by the sampling result of the dark pixel signal is different from that of the active pixel The noise information carried by the signal sampling results is quite different, resulting in limited noise reduction effect

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  • Signal processing circuit and method for pixel array and image sensor
  • Signal processing circuit and method for pixel array and image sensor
  • Signal processing circuit and method for pixel array and image sensor

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Embodiment Construction

[0046] Certain terms are used in the specification and preceding claims to refer to particular components. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This description and the previous claims do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for distinction. "Includes" mentioned throughout the specification and the preceding claims is an open-ended term, so it should be interpreted as "including but not limited to". Furthermore, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means. Two devices.

[0047...

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Abstract

The present disclosure provides a signal processing circuit, a signal processing method, and an image sensor for a pixel array. The signal processing circuit (230) includes a signal generating circuit(232), a comparison circuit (234X), and a counting circuit (236X). The signal generating circuit is configured to generate a second ramp signal according to a first ramp signal and N first pixel signals output by the pixel array, where N is a positive integer. The second ramp signal includes noise information carried by the N first pixel signals. The comparison circuit is coupled to the signal generation circuit, and is configured to compare a second pixel signal output from the pixel array with the second ramp signal to generate a comparison signal. The counting circuit is coupled to the comparison circuit and configured to generate a count value of the second pixel signal according to the comparison signal. The signal processing circuit can deduct the noise information included by the active pixel signal and the dark pixel signal in real time.

Description

technical field [0001] The present disclosure relates to pixel signal processing technology, and in particular, to a signal processing circuit and signal processing method for a pixel array, and a related image sensor. Background technique [0002] A pixel array of an image sensor using active noise reduction (ANC) includes active pixels and dark pixels. The image sensor samples the active pixel signal generated by the active pixel and the dark pixel signal generated by the dark pixel respectively, and subtracts the sampling result of the dark pixel from the sampling result of the active pixel signal to reduce the sampling result of the active pixel signal including noise information. However, since the noise interference of the pixel array changes with time, and the image sensor samples the dark pixel signal and the active pixel signal at different time points, the noise information carried by the sampling result of the dark pixel signal is different from that of the activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/369H04N5/378H04N5/357H04N5/361
CPCH04N25/60H04N25/63H04N25/70H04N25/75
Inventor 徐荣贵
Owner SHENZHEN GOODIX TECH CO LTD
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