A high dynamic cmos pixel unit

Abstract

The present invention disclosed a high -dynamic CMOS pixel unit, including: the light sensing diode, the first MOS tube, the fifth MOS tube, and the sixth MOS tube in turn;Between the first MOS tube and the fifth MOS tube, another polar connection capacitor of the fourth MOS tube; the second MOS tube, one pole is connected between the light sensing diode and the first MOS tube, and the other is connected to the first pole to the first poleBetween the four MOS tubes and the capacitor; the current source is connected to the output of the sixth MOS tube.The present invention can output low -light signals and high -light signals at the same time, and can process signal splicing by signal signals and high -light signals to increase the saturated output voltage of the pixel unit, which can increase the effective light range of pixel units, and and and of.As a result, the dynamic range of image sensors.The present invention also disclosed a signal collection and processing method of a high -dynamic CMOS pixel unit.

Description

technical field [0001] The present invention relates to the technical field of image sensors, in particular to a pixel unit of a high dynamic CMOS image sensor and a signal acquisition and processing method thereof. Background technique [0002] After decades of rapid development, CMOS image sensor technology has become more mature. With its advantages of low power consumption, low cost and high performance, CMOS image sensors have been widely used in various aspects. At the same time, with the advancement of technology and the diversity of application requirements, higher requirements are placed on CMOS image sensors. [0003] The HDR image sensor can perceive scenes under extremely low illumination and high illumination at the same time and in the same image. Such image sensors are widely used in national defense, industry, and life. Generally speaking, there are two ways to achieve high dynamic images: [0004] 1) For traditional image sensors, by changing the exposur...

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Problems solved by technology

[0006] However, the above methods have certain limitations

For example, when using the above method 1), on the one hand, its algorithm is complicated, and on the other hand, it is not suitable for video applications because it requires multiple exposures

When the above method 2) is adopted, although this architecture can obtain an image whose output voltage has a logarithmic characteristic with the light intensity, this architecture also makes it difficult to guarantee the pixel consistency, making it difficult to realize

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