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Image sensor

An image sensor and pixel circuit technology, applied in the field of image sensors, can solve the problems of complex timing control, etc., and achieve the effects of simple control timing, simplified complexity, and wide dynamic range

Active Publication Date: 2018-02-02
淮安西德工业设计有限公司
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AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the timing control of different exposure times is more complicated, and it also brings a larger circuit scale and area.

Method used

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Embodiment Construction

[0028] As described in the background technology section, at present, based on a frame of image captured, the method of controlling the use of different exposure times for the odd and even rows of the pixel array in the image sensor to obtain two sub-frame images and then merge them is implemented. While wide dynamic range imaging ranges, timing control is too complex.

[0029] The inventors of the present application have conducted research and analysis on the realization of wide dynamic range of image sensors in the prior art.

[0030] First, the image sensor needs to be exposed when capturing an image. The so-called exposure is to let the light shine on the photosensitive element to cause a series of physical and chemical changes, so as to obtain a frame of image. Specifically, when light hits a certain pixel on the image sensor (that is, the photosensitive element in the pixel circuit), charges are generated, and the amount of charges is proportional to the light received...

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Abstract

The invention discloses an image sensor. The image sensor comprises multiple pixel circuits and a control module, wherein the multiple pixel circuits are arranged in an array; the multiple pixel circuits are formed into a pixel array; each of the pixel circuits comprises a photosensitive element and a capacitor module, wherein the photosensitive elements are applied to generating charges when receiving illumination of light rays; the number of the charges is in direct proportion to illuminance of the light rays; capacitance values of the capacitor modules are adjustable; first ends of the capacitor modules are coupled to a voltage reference end, and second ends of the capacitor modules are directly or indirectly coupled to output ends of the photosensitive elements and output ends of the pixel circuits, thereby generating a pixel voltage according to the capacitance values and the charges; and the control module is applied to controlling the capacitor modules on an odd-numbered line and an even-numbered line in the pixel array to provide different capacitance values. By employing the technical scheme of the invention, while a wide dynamic range of the image sensor is implemented, the complexity of controlling a time sequence is simplified.

Description

technical field [0001] The invention relates to image sensor technology, in particular to an image sensor. Background technique [0002] The image sensor is an important part of the camera. In traditional cameras, the image sensor is realized by film, while in modern digital cameras, the image sensor is realized by Complementary Metal Oxide Semiconductor (CMOS for short) or Charge-coupled Device (CCD for short) image sensor to achieve. The pixel circuit is the core device of the image sensor to realize light sensing, and usually includes a photodiode to realize photoelectric conversion. The image sensor may also include a series of circuit modules for transmission, signal conversion and amplification, and control. In order to obtain excellent image quality in both strong and low light conditions, the researchers used every possible technique to increase the dynamic range of the image sensor pixels. [0003] At present, both high-end cameras and mobile phones can provide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225H04N5/235
CPCH04N23/54H04N23/741
Inventor 龚劲峰常建光
Owner 淮安西德工业设计有限公司
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