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High-speed global shutter image sensor pixel and its pixel signal acquisition method

An image sensor, global shutter technology, applied in image communication, TV, color TV components, etc., to achieve the effect of reducing frame transfer time

Active Publication Date: 2017-01-25
GPIXEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not applicable when the exposure time and exposure interval are very short

Method used

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  • High-speed global shutter image sensor pixel and its pixel signal acquisition method
  • High-speed global shutter image sensor pixel and its pixel signal acquisition method
  • High-speed global shutter image sensor pixel and its pixel signal acquisition method

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Embodiment 1

[0036] Such as Figure 4 As shown, the high-speed global shutter image sensor pixel of the present invention includes a reset switch M1, a photodiode D, first and second sampling capacitors C11 and C12, first, second and third buffer amplifiers AMP1, AMP2 and AMP3, the first , the second sampling switch S1, S2, the row selection switch READ; the first buffer amplifier AMP1 is composed of the first source follower M12 and its current source load M13, and the second buffer amplifier AMP2 is composed of the second source follower M15 And its current source load M16 constitutes. The reset switch M1, the first source follower M12 and its current source load M13, the second source follower M15 and its current source load M16 all use field effect transistors; the drain of the reset switch M1 is connected to the reset voltage Vreset, The source is connected to the cathode of the photodiode D and the gate of the first source follower M12; the drain of the first source follower M12 is ...

Embodiment 2

[0046] Such as Figure 7 As shown, the high-speed global shutter image sensor pixel of the present invention includes a reset switch M1, a photodiode D, first and second sampling capacitors C11 and C12, first, second and third buffer amplifiers AMP1, AMP2 and AMP3, the first , the second sampling switches S1 and S2, and the row selection switch READ; the first buffer amplifier AMP1 is composed of a first source follower M12, and the second buffer amplifier AMP2 is composed of a second source follower M15. The reset switch M1, the first source follower M12, and the second source follower M15 all use field effect transistors; the drain of the reset switch M1 is connected to the reset voltage Vreset, and the source is connected to the cathode of the photodiode D and the first The gate of the source follower M12; the drain of the first source follower M12 is connected to the power supply voltage Vsf_pulse1, and the source is connected to the first sampling capacitor C11 and the ga...

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Abstract

The invention relates to a high-speed global-shutter image sensor pixel and a pixel signal collecting method. The input end of a reset switch of the pixel is connected with a resetting voltage, the output end of the reset switch of the pixel is connected with the negative pole of a photodiode and the input end of a first buffer amplifier, the positive pole of the photodiode is grounded, the output end of the first buffer amplifier is connected with a first sampling capacitor and the input end of a second buffer amplifier through a first sampling switch, the output end of the second buffer amplifier is connected with a second sampling capacitor and the input end of a third buffer amplifier through a second sampling switch, the other end of the second sampling capacitor is grounded, and the output end of the third buffer amplifier is connected with a bus through a row-selection switch. In a double-sampling mode, two frames of signal values and the resetting voltage values are collected continuously and then read out, in a continuous and quick two-frame read-out mode, two continuous frames of signal voltages are collected and then read out, the interval time of the two frames is short, and the capacity of quickly collecting two frames of images under the condition that pixel noise is eliminated is achieved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor image sensing, and in particular relates to an image sensor pixel used for a high-speed global shutter and a method for collecting pixel signals thereof. Background technique [0002] When shooting fast-moving objects, you need to use a global shutter to avoid image distortion. A typical global shutter CMOS pixel such as figure 1 As shown, it consists of reset switch M1, photodiode D, buffer amplifier AMP1, sampling switch M4, sampling capacitor C1, buffer amplifier M5 and row selection switch M6. The pixel is based on the traditional 3T pixel structure. First, the reset switch is closed and the photodiode is reset. Then the reset switch is turned off, and the pixel starts to be exposed. The photodiode converts the received light signal into an electrical signal. During the frame transfer time, the sampling switch is first closed and the electrical signal converted by the photodiode is sto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/374H04N5/378H04N5/363
Inventor 王欣洋马成
Owner GPIXEL
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