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Light ray lightness detection method in CMOS image sensor and special chip therefor

An image sensor and brightness detection technology, applied in the field of dedicated CMOS image sensor chips, can solve the problems of difficult wide application, high power consumption, complex processing flow, etc., and achieve the effects of improving competitiveness, improving integration, and reducing costs

Active Publication Date: 2011-05-04
GALAXYCORE SHANGHAI
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Problems solved by technology

In recent years, ambient brightness sensors have begun to be used in some notebook computers and mobile phones, but due to the high cost, it is difficult to be widely used, and mobile phones are generally equipped with CMOS image sensors. If the image signal output by the image sensor is normal , through the hardware or software calculation outside the image sensor chip, it can also be used as an ambient brightness sensor. The disadvantage of this method is that the power consumption is still high and the processing flow is complicated.

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  • Light ray lightness detection method in CMOS image sensor and special chip therefor
  • Light ray lightness detection method in CMOS image sensor and special chip therefor
  • Light ray lightness detection method in CMOS image sensor and special chip therefor

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Embodiment Construction

[0024] The steps of the light brightness detection method in the image sensor chip proposed by the present invention are as follows: figure 1 shown. First, the image sensor chip is in the initial state (step 100); then, it is judged whether the image sensor chip is in the low-power standby mode (step 110); if the image sensor chip is not in the low-power standby mode, it is in the normal image sensing state (Step 120), when the image sensor chip is working normally, that is, when performing image sensing, the output image signal already includes a luminance signal (YUV format) or can be converted into a luminance signal (RGB and other formats), so at this time There is no need to perform additional brightness detection; and when the image sensor chip is in the low-power standby mode (state), the image sensing function of the chip is turned off, there is no image signal output, and the light brightness detection module in the chip is started at the same time. The power consump...

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Abstract

The invention discloses a method for detecting ambient light brightness applied to a CMOS image sensor chip. The method comprises the following steps: when the CMOS image sensor chip is in a low power consumption standby mode, starting a photoelectric element array, acquiring the ambient light brightness value, converting the ambient light brightness value into light brightness digital signal, and outputting the signal. Besides, the invention also discloses a special CMOS image sensor chip for achieving the method. The method achieves the function of detecting the ambient light brightness in the low power consumption mode, improves the integration of the chip and effectively reduces the cost.

Description

technical field [0001] The invention relates to a light brightness detection method, in particular to a light brightness detection method applied in a CMOS image sensor chip. In addition, the present invention also relates to a dedicated CMOS image sensor chip for realizing the above method. Background technique [0002] The rapid development of CMOS integrated circuits has made them widely used in industries such as computers, control systems, communication systems, and image imaging. Image sensors based on CMOS technology also occupy a place in the fields of mobile phone cameras, toys and security monitoring because of their advantages of low power consumption and low cost. In recent years, ambient brightness sensors have begun to be used in some notebook computers and mobile phones, but due to the high cost, it is difficult to be widely used, and mobile phones are generally equipped with CMOS image sensors. If the image signal output by the image sensor is normal , thro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/374H04N5/378H01L27/146G01J1/42H04N25/00
Inventor 赵立辉付文
Owner GALAXYCORE SHANGHAI
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