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1. WO2021042231 - SIGNAL PROCESSING CIRCUIT AND METHOD FOR USE IN PIXEL ARRAY, AND IMAGE SENSOR

Publication Number WO/2021/042231
Publication Date 11.03.2021
International Application No. PCT/CN2019/103944
International Filing Date 02.09.2019
IPC
H04N 5/357 2011.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors
357Noise processing, e.g. detecting, correcting, reducing or removing noise
H04N 5/365 2011.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors
357Noise processing, e.g. detecting, correcting, reducing or removing noise
365applied to fixed-pattern noise, e.g. non-uniformity of response
CPC
H04N 5/357
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors [SSIS]
357Noise processing, e.g. detecting, correcting, reducing or removing noise
H04N 5/361
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors [SSIS]
357Noise processing, e.g. detecting, correcting, reducing or removing noise
361applied to dark current
H04N 5/369
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors [SSIS]
369SSIS architecture; Circuitry associated therewith
H04N 5/378
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
30Transforming light or analogous information into electric information
335using solid-state image sensors [SSIS]
369SSIS architecture; Circuitry associated therewith
378Readout circuits, e.g. correlated double sampling [CDS] circuits, output amplifiers or A/D converters
Applicants
  • 深圳市汇顶科技股份有限公司 SHENZHEN GOODIX TECHNOLOGY CO., LTD. [CN]/[CN]
Inventors
  • 徐荣贵 HSU, Jung-kuei
Agents
  • 北京天驰君泰律师事务所 TIANTAI LAW FIRM
Priority Data
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) SIGNAL PROCESSING CIRCUIT AND METHOD FOR USE IN PIXEL ARRAY, AND IMAGE SENSOR
(FR) CIRCUIT ET PROCÉDÉ DE TRAITEMENT DE SIGNAL DESTINÉS À ÊTRE UTILISÉS DANS UN RÉSEAU DE PIXELS, ET CAPTEUR D'IMAGE
(ZH) 用于像素阵列的信号处理电路和方法以及图像传感器
Abstract
(EN)
Provided in the present disclosure are a signal processing circuit and a signal processing method for use in a pixel array, and an image sensor. The signal processing circuit (230) comprises a signal generating circuit (232), a comparison circuit (234X), and a counting circuit (236X). The signal generating circuit is used for generating a second ramp signal on the basis of a first ramp signal and of N first pixel signals outputted by the pixel array, where N is a positive integer, and the second ramp signal comprises noise information carried by the N first pixel signals. The comparison circuit is coupled with the signal generating circuit and is used for comparing a second pixel signal outputted by the pixel array with the second ramp signal, thus generating a comparison signal. The counting circuit is coupled with the comparison circuit and is used for generating a count value of the second pixel signal on the basis of the comparison signal. The signal processing circuit is capable of deducting in real-time noise information that an active pixel signal and a dark pixel signal jointly comprise.
(FR)
La présente invention concerne un circuit de traitement de signal et un procédé de traitement de signal destinés à être utilisés dans un réseau de pixels, ainsi qu'un capteur d'image. Le circuit de traitement de signal (230) comprend un circuit de génération de signal (232), un circuit de comparaison (243X) et un circuit de comptage (236X). Le circuit de génération de signal sert à générer un second signal de rampe sur la base d'un premier signal de rampe et de N premiers signaux de pixel émis par le réseau de pixels, N étant un nombre entier positif, et le second signal de rampe comprenant des informations de bruit portées par les N premiers signaux de pixel. Le circuit de comparaison est couplé au circuit de génération de signal et sert à comparer un second signal de pixel émis par le réseau de pixels au second signal de rampe, produisant ainsi un signal de comparaison. Le circuit de comptage est couplé au circuit de comparaison et sert à générer une valeur de comptage du second signal de pixel sur la base du signal de comparaison. Le circuit de traitement de signal peut déduire en temps réel des informations de bruit qui comprennent conjointement un signal de pixel actif et un signal de pixel sombre.
(ZH)
本公开提供一种用于像素阵列的信号处理电路和信号处理方法以及图像传感器。所述信号处理电路(230)包括信号产生电路(232)、比较电路(234X)以及计数电路(236X)。所述信号产生电路用以根据第一斜坡信号和所述像素阵列输出的N个第一像素信号产生第二斜坡信号,其中N是正整数,所述第二斜坡信号包括所述N个第一像素信号携带的噪声信息。所述比较电路耦接到所述信号产生电路,用以将所述像素阵列输出的第二像素信号与所述第二斜坡信号作比较,以产生比较信号。所述计数电路耦接到所述比较电路,用以根据所述比较信号产生所述第二像素信号的计数值。所述信号处理电路可实时地扣除有源像素信号与暗像素信号共同包括的噪声信息。
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