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Global shutter pixel unit and signal acquisition method thereof

A pixel unit and global shutter technology, applied in the field of image sensors, to achieve the effect of wide application range and high dynamic range

Active Publication Date: 2015-02-25
SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this 8T global shutter pixel unit can perform pixel exposure at the same time, the dynamic range is only half of the dynamic range of the general pixel unit

Method used

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  • Global shutter pixel unit and signal acquisition method thereof
  • Global shutter pixel unit and signal acquisition method thereof
  • Global shutter pixel unit and signal acquisition method thereof

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Embodiment Construction

[0039] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be further described below in conjunction with the accompanying drawings. Of course, the present invention is not limited to this specific embodiment, and general replacements known to those skilled in the art are also covered within the protection scope of the present invention.

[0040] figure 2 is a block diagram of the global shutter pixel unit of the present invention, image 3 It is a schematic circuit diagram of the global shutter pixel unit of the present invention.

[0041] like figure 2 As shown, the global shutter pixel unit includes a photodiode 10 , a signal reading circuit 20 , a signal holding circuit 30 and a signal output circuit 40 connected in sequence. Wherein, the photosensitive diode 10 is used for converting the light signal it receives into an electrical signal. The signal reading circuit is used to successively re...

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Abstract

The invention discloses a global shutter pixel unit. The global shutter pixel unit comprises a photodiode, a signal reading circuit, a signal maintaining circuit and a signal output circuit, wherein the photodiode is used for converting a received optical signal into an electrical signal, the signal reading circuit is used for reading a reset signal and the electrical signal subjected to photovoltaic conversion of the photodiode in sequence, the signal maintaining circuit comprises two parallel capacitors which are used for maintaining the signals read by the signal reading circuit respectively, one end of each capacitor is grounded, the other end of each capacitor is connected with two switch tubes to control the charging and discharging states of the corresponding capacitor, the signal output circuit is used for outputting the signals maintained by the two capacitors, and the difference between the signals maintained by the two capacitors is the signal of the global shutter pixel unit. The global shutter pixel unit can achieve global exposure and has a high dynamic range.

Description

technical field [0001] The invention relates to the field of image sensors, in particular to a global shutter pixel unit and a signal acquisition method thereof. Background technique [0002] Today, CMOS sensors are widely used as imaging devices due to their higher sensitivity, shorter exposure time, and shrinking pixel unit size. CMOS image sensors generally adopt two exposure methods: rolling shutter (Rolling Shutter) and global exposure (Global Shutter). The traditional 4T pixel unit usually belongs to the Rolling Shutter Pixel. For the pixel unit array of the CMOS image sensor, the exposure time of the pixel units in different rows (columns) does not start or end at the same time. , this non-simultaneity is no problem for ordinary imaging equipment applications, but it will cause obvious image distortion and deformation when shooting images at high frame rates. Therefore, when performing imaging of a high-speed moving object, it needs to be realized by the pixel unit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/374H04N5/355
CPCH04N25/616H04N25/771
Inventor 任铮赵宇航
Owner SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT