Global shutter pixel unit and its signal acquisition method

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

Active Publication Date: 2018-01-26
SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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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] Such as 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...

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Abstract

The invention discloses a global shutter pixel unit, comprising: a photosensitive diode used to convert received light signals into electrical signals; The electrical signal; the signal holding circuit, which includes two capacitors connected in parallel to respectively hold the signals read by the signal reading circuit; one end of each capacitor is grounded, and the other end is connected to two switch tubes to control the the charging and discharging state of the capacitor; and a signal output circuit, configured to output the signals held by the two capacitors, wherein the difference between the signals held by the two capacitors is the signal of the global shutter pixel unit. The invention not only can realize global exposure, but also has 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 Patents(China)
IPC IPC(8): H04N5/374H04N5/355
Inventor 任铮赵宇航
Owner SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT
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