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Signal collection method and signal collection circuit of image sensor

An image sensor and signal acquisition technology, applied in the field of image sensors, can solve the problem that processing logic needs to be improved, etc.

Active Publication Date: 2019-04-16
SHANGHAI OXI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The processing logic of the existing signal acquisition method needs to be improved when clearing the pixels

Method used

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  • Signal collection method and signal collection circuit of image sensor
  • Signal collection method and signal collection circuit of image sensor
  • Signal collection method and signal collection circuit of image sensor

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Embodiment Construction

[0030] As mentioned in the background art, the processing logic of the existing signal acquisition method needs to be improved when clearing pixels.

[0031] Specifically, refer to figure 1 and figure 2 The signal acquisition circuit 1 of the image sensor may include a pixel array 10 , a scan line control circuit 15 and a signal readout chip 16 (Readout IC, ROIC for short). Wherein, the pixel array 10 has a plurality of data lines 11 and a plurality of scan lines 12 , the data lines 11 and the scan lines 12 define grids arranged in an array, and the areas where the grids are located correspond to pixels 13 .

[0032] Further, the pixel 13 includes at least one pixel switch 131 and at least one photosensitive device 132 . Wherein, the pixel switch 131 is generally a thin film transistor (Thin Film Transistor, TFT for short) device, and the photosensitive device 132 is used to collect an externally input optical signal and convert it into an electrical signal, and then store ...

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Abstract

The invention provides a signal collection method and a signal collection circuit of an image sensor. The image sensor comprises a plurality of pixels arranged in an array, each pixel comprises photodiode, and the signal collection method comprises the following steps: performing signal collection on the plurality of pixels row by row within each signal collection period, wherein the signal collection period comprises at least one reset frame and at least one clearing frame, and applying a forward bias voltage to the photodiode of each collected pixel in each reset frame; and applying a reverse bias voltage to the photodiode of each collected pixel in each clearing frame. By adoption of the scheme provided by the invention, while the signal collection period is shortened, a better clearing effect is ensured, and the influence of ambient light on imaging is eliminated.

Description

technical field [0001] The present invention relates to the technical field of image sensors, in particular to a signal acquisition method and a signal acquisition circuit of an image sensor. Background technique [0002] An image sensor is a sensing device that uses the photoelectric conversion function of a photoelectric device to convert the light image on the photosensitive surface into an electrical signal that is proportional to the light image. [0003] Taking an optical fingerprint sensor as an example, it usually consists of a pixel array, a control line (also called a drive line), a scan line (also called a signal readout line), and the like. Wherein, each pixel in the pixel array has a photoelectric device to realize the conversion of optical signal to electrical signal. [0004] The existing optoelectronic devices used in image sensors are usually photodiodes (Photo-Diodes). Prior to acquisition, unwanted charges are present on each pixel. Therefore, before th...

Claims

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Application Information

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IPC IPC(8): H04N5/235H04N5/378H04N5/369
CPCH04N23/73H04N25/70H04N25/75
Inventor 凌严朱虹
Owner SHANGHAI OXI TECH
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