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Image sensor and output circuit thereof

An image sensor and output circuit technology, applied in the field of image sensors, can solve problems such as complex timing control, and achieve the effect of simplifying complexity and wide dynamic range

Active Publication Date: 2018-01-19
淮安西德工业设计有限公司
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  • Abstract
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  • Claims
  • Application Information

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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  • Image sensor and output circuit thereof
  • Image sensor and output circuit thereof

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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 provides an image sensor and an output circuit thereof. The output circuit comprises a slope signal generating circuit, an analog-digital conversion circuit and a control module, and theslope signal generating circuit is suitable for outputting slope voltages, wherein the slope voltages linearly change with time; the analog-digital conversion circuit receives pixel voltages which come from a pixel array and the slope voltages and is suitable for obtaining pixel digital signals of the pixel voltages according to the moment when the pixel voltages are equal to the slope voltages;the control module is suitable for controlling the slope signal generating circuit to provide the slope voltages with different slopes aiming at an odd number of pixel voltages and an even number of pixel voltages. According to the technical scheme, the image sensor wide dynamic range is achieved, and the complexity for controlling the time sequence is simplified.

Description

technical field [0001] The invention relates to the technical field of image sensors, in particular to an image sensor and an output circuit thereof. 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...

Claims

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Application Information

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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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