US 12,395,753 B2
Image sensor and image output method thereof, and optoelectronic device
Jian Deng, Guangdong (CN); and Yingyun Zha, Guangdong (CN)
Assigned to SHENZHEN RUISHIZHIXIN TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by Shenzhen Ruishizhixin Technology Co., Ltd., Guangdong (CN)
Filed on Oct. 13, 2023, as Appl. No. 18/379,676.
Application 18/379,676 is a continuation of application No. PCT/CN2023/097298, filed on May 31, 2023.
Claims priority of application No. 202310285432.0 (CN), filed on Mar. 22, 2023.
Prior Publication US 2024/0323572 A1, Sep. 26, 2024
Int. Cl. H04N 25/571 (2023.01); H04N 25/53 (2023.01); H04N 25/57 (2023.01); H04N 25/59 (2023.01); H04N 25/703 (2023.01); H04N 25/709 (2023.01); H04N 25/78 (2023.01)
CPC H04N 25/573 (2023.01) [H04N 25/53 (2023.01); H04N 25/57 (2023.01); H04N 25/59 (2023.01); H04N 25/703 (2023.01); H04N 25/709 (2023.01); H04N 25/78 (2023.01)] 14 Claims
OG exemplary drawing
 
1. An image sensor comprising a pixel array comprising a plurality of pixels, wherein the plurality of pixels comprise a floating diffusion node, an integrating capacitor, a photoelectric detection circuit, a signal readout circuit, an adaptive power supply, a transmission circuit, and a signal processing circuit; wherein the photoelectric detection circuit is connected to the floating diffusion node through the transmission circuit, and the floating diffusion node is grounded through the integrating capacitor; the floating diffusion node and the integral capacitor are both connected to the signal readout circuit, and the adaptive power supply is connected to the floating diffusion node through the signal processing circuit;
the photoelectric detection circuit is configured to perform a photoelectrical conversion on an incident light to obtain a corresponding photoelectric charge;
the transmission circuit is configured to transmit the photoelectric charge to the floating diffusion node;
the signal processing circuit is configured to generate a logarithmic voltage and a logarithmic current, wherein the logarithmic voltage and the logarithmic current are in a logarithmic relationship;
the floating diffusion node is configured to integrate the photoelectric charge into the integrating capacitor to obtain a corresponding integral voltage; after the floating diffusion node receives the photoelectric charge, a difference between a target voltage and the reference voltage is greater than a preset threshold value, and the logarithmic current is less than the photocurrent corresponding to the photoelectric charge, so that a node current of the floating diffusion node is the photocurrent corresponding to the photoelectric charge, a node voltage of the floating diffusion node is the integral voltage, and the target voltage is equal to an adaptive voltage of the adaptive power supply minus the node voltage; the target voltage increases with time, and when the target voltage increases to a level at which the difference between the target voltage and the reference voltage is less than or equal to the preset threshold value, the logarithmic current is greater than the photocurrent corresponding to the photoelectric charge, and the logarithmic current flows into the floating diffusion node, so that the node current is the logarithmic current and the node voltage is the logarithmic voltage; and
the signal readout circuit is configured to output a corresponding image signal according to the node voltage.