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Circuit capable of improving dynamic range of image sensor and control method thereof

An image sensor and dynamic range technology, which is applied in image communication, television, electrical components, etc., can solve the problems of limited application range and small dynamic range, and achieve the effect of expanding application range, expanding dynamic range, and improving dynamic range

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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The dynamic range of the CMOS image sensor in the prior art is small, which limits the scope of application

Method used

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  • Circuit capable of improving dynamic range of image sensor and control method thereof
  • Circuit capable of improving dynamic range of image sensor and control method thereof
  • Circuit capable of improving dynamic range of image sensor and control method thereof

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] In order to expand the dynamic range of the CMOS image sensor and expand the application range of the CMOS image sensor, an embodiment of the present invention provides a circuit and a control method for improving the dynamic range of the image sensor, as described below for details:

[0032] see figure 1 and figure 2 , a circuit for improving the dynamic range of an image sensor, the circuit comprising: a pixel integration circuit, a comparator, an accumulator, a memory, a first switch S1 and a second switch S2;

[0033] The output terminals of the pixel integration circuit are respectively connected to one terminal of the first switch S1 and one terminal of the second switch S2; the other terminal of the first switch S1 is r...

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Abstract

The invention discloses a circuit capable of improving dynamic range of an image sensor and a control method thereof. An output end of a pixel integrating circuit is respectively connected with one end of a first switch and one end of a second switch, the other end of the first switch is respectively connected with an input end of a comparator and an input end of an accumulator, the other end of the second switch is respectively connected with an input end of the comparator and an input end of the accumulator, the other input end of the comparator is connected with reference voltage, an output end of the comparator is connected with an input end of a storage unit, and an output end of the storage unit is connected with the pixel integrating circuit. In multiple integration periods of a TDI (time delay integration), input optical signal intensity is judged according to the first integration period, integral capacitance is adjusted and a proper capacitor is selected according to optical signal intensity range, signals read in the second integration period to the nth integration period are accumulated, and accordingly, the dynamic range of a CMOS(complementary metal oxide semiconductor) image sensor can be expanded effectively and application range thereof is expanded simultaneously.

Description

technical field [0001] The invention relates to the field of digital-analog hybrid integrated circuit design, in particular to a circuit for improving the dynamic range of an image sensor and a control method thereof, which can be applied to a Time Delay Integration (TDI) type CMOS image sensor. Background technique [0002] Time-delay integration technology is a technology that can increase the sensitivity of line array image sensors. With its special scanning method, it can achieve high sensitivity and signal-to-noise ratio by making multiple exposures to the same target, especially suitable for low illumination And shooting occasions of moving objects. The basic principle of TDI is to take multiple exposures (integration) and accumulate them for the same moving object. As the photoreceptor accumulates multiple incident light, the image signal and overall brightness are correspondingly greatly improved. [0003] In the process of realizing the present invention, the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/355H04N5/369
Inventor 高静史再峰徐江涛
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