A high dynamic range image sensor readout circuit and readout method
An image sensor, high dynamic range technology, applied in the direction of image communication, television, electrical components, etc., can solve the problems of cumbersome readout circuit structure, unfavorable image sensor readout circuit integration and reduction of chip area, etc., to improve dynamic Scope, the effect of reducing the area
Active Publication Date: 2021-11-19
SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT +1
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Problems solved by technology
The structure of the readout circuit in the prior art is relatively cumbersome, which is not conducive to the improvement of the integration of the image sensor readout circuit and the reduction of the chip area
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[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the following further detailed description of the drawings of specific embodiments of the present invention binds.
[0024] A high-dynamic range image sensor of the present invention provides a readout circuit for reading out a pixel signal, and the pixel signals read out to a digital value. Append figure 1 , The present invention includes a pixel unit readout circuit, an operational amplifier, the row select switch S1, the switch S2, the switches S3, switch S4, the switch S5, a switch S6, capacitor C1, capacitor C2, and a counter; an inverting input of the operational amplifier switch S2 is connected, one end of the switch S3, the capacitor C1, as a node Nl herein; the other end of the capacitor C1 is connected to one end of the switch S4, the switch S2 is connected to the other end of end of the switch S6, the other end of the switch S3 while the switch S4 is connected control te...
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In a high dynamic range image sensor readout circuit disclosed by the present invention, the inverting input terminal of the operational amplifier is connected to a switch S2, a switch S3, and one end of a capacitor C1, the other end of the capacitor C1 is connected to one end of a switch S4, and the other end of the switch S2 One end is connected to one end of the switch S6, the other end of the switch S3 is connected to the other end of the switch S4, one end of the switch S5, the control end of the counter and the output end of the operational amplifier, and the other end of the switch S5 is connected to one end of the capacitor C2 and the end of the switch S6 On the other end, the other end of the capacitor C2 is connected to the negative pole of the power supply; the inverting input end of the operational amplifier is connected to the output end of the pixel unit through the row selection switch S1. The invention provides a high dynamic range image sensor readout circuit and readout method, which can effectively improve the dynamic range of the image sensor, and can also effectively reduce the chip area.
Description
Technical field [0001] The present invention relates to image sensors, and in particular relates to a high dynamic range image sensor readout circuit and a readout method. Background technique [0002] With the continuous development of semiconductor technology, CMOS image sensors become ubiquitous. CMOS image sensors have been in various industries industrial control, transportation security, consumer electronics, aerospace and other access to a wide range of applications, but also made more scientific and technological development and higher requirements for the image sensor, such as high-speed, high dynamic range, high SNR. Including high dynamic imaging with a wide range of applications in transportation security, scientific research. [0003] In general, the method of the CMOS image sensor to achieve a high dynamic image comprises the following two: (1) conventional pixel circuit for controlling the length of exposure, post-splicing signal, but the mode control complex, requ...
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IPC IPC(8): H04N5/378H04N5/3745H04N5/355H04N5/353
CPCH04N25/53H04N25/57H04N25/778H04N25/75
Inventor 段杰斌沈灵李琛
Owner SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT