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Light detection circuit, light detection method and light detection device

A light detection and circuit technology, applied in the field of light detection, can solve the problem of inability to provide light signal detection of photosensitive transistors

Active Publication Date: 2020-05-05
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a light detection circuit, a light detection method and a light detection device to solve the problem that the prior art cannot provide a light signal detection using the characteristics of the photosensitive transistor itself

Method used

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  • Light detection circuit, light detection method and light detection device
  • Light detection circuit, light detection method and light detection device
  • Light detection circuit, light detection method and light detection device

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Embodiment approach

[0056] According to another specific embodiment, the gate of the photosensitive transistor is connected to the first voltage input terminal, the photosensitive transistor is an n-type transistor, and the first voltage V1 is greater than the second voltage V2. The voltage difference between V1 and V2 needs to be greater than the threshold voltage of the photosensitive transistor. The specific principle will be described below in conjunction with the working process of the specific embodiment.

[0057] According to another specific embodiment, the gate of the photosensitive transistor is connected to the first voltage input terminal, the photosensitive transistor is a p-type transistor, and the first voltage V1 is less than the second voltage V2. The voltage difference between V1 and V2 needs to be smaller than the threshold voltage of the photosensitive transistor. The specific principle will be described below in conjunction with the working process of the specific embodiment.

[0...

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Abstract

An optical detection circuit, an optical detection method and an optical detection device are provided. The circuit includes a photosensitive transistor, a resetting unit, an energy storing unit, a detection control unit and a detection unit. A threshold voltage of the photosensitive transistor varies with an intensity of an optical signal received by the photosensitive transistor. A wavelength of the optical signal is within a preset wavelength range. The detection control unit is configured to control the first node to be connected to the detection unit under control of a detection control terminal. The detection unit is connected to the first node via the detection control unit and is configured to, when the detection control unit controls the first node to be connected to the detection unit, detect an electric signal from the first node and obtain the intensity of the optical signal based on the electric signal.

Description

Technical field [0001] The present invention relates to the field of light detection technology, in particular to a light detection circuit, a light detection method and a light detection device. Background technique [0002] The light detection circuit that detects light signals with a wavelength in a specific wavelength range is used in many aspects. The light detection circuit can be applied to vein recognition (need to detect near-infrared light), medical treatment, mobile phones, and secure payment. However, the prior art cannot provide a simple and convenient optical detection circuit for detecting optical signals with wavelengths in a specific wavelength range. Summary of the invention [0003] The main purpose of the present invention is to provide a light detection circuit, a light detection method, and a light detection device, so as to solve the problem that the prior art cannot provide a light-sensing transistor using its own characteristics to facilitate light signal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/44
CPCG01J1/44G01J2001/4473H01L31/113H01L27/1443H01L31/02019H01L31/022408H01L31/032H01L31/03762H01L31/1136
Inventor 王志良
Owner BOE TECH GRP CO LTD
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