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Light detection circuit, light detection method and light detection apparatus

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: 2018-09-11
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Embodiment approach

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

[0057] According to another specific implementation manner, 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 smaller than the second voltage V2. At this time The voltage difference between V1 and V2 needs to be smaller than the threshold voltage of the phototransistor. The specific principle will be described below in conjunction with the working process of s...

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Abstract

The invention provides a light detection circuit, a light detection method and a light detection apparatus. The light detection circuit comprises a photosensitive transistor, a resetting unit, an energy storage unit, a detection control unit and a detection unit, a threshold voltage of the photosensitive transistor changes with the change of the intensity of an optical signal received thereby, thewavelength of the optical signal is located within a predetermined wavelength range, the detection control unit is used for controlling whether a first node and the detection unit are switched on under the control of a detection control terminal, and the detection unit is connected with the first node through the detection control unit and used for detecting an electric signal from the first nodeand obtaining the intensity of the optical signal according to the electric signal when the detection control unit controls the switch-on between the first node and the detection unit. According to the light detection circuit, the light detection method and the light detection apparatus, the detection of the optical signals can be conveniently conducted by employing characteristics of the photosensitive transistor.

Description

technical field [0001] The invention relates to the technical field of light detection, in particular to a light detection circuit, a light detection method and a light detection device. Background technique [0002] The optical detection circuit for detecting optical signals with a wavelength within a specific wavelength range is used in many aspects. The optical detection circuit can be applied to vein identification (need to detect near-infrared light), medical treatment, mobile phones, security payment and other conveniences. However, the prior art cannot provide a simple and convenient optical detection circuit for detecting optical signals with a wavelength within a specific wavelength range. Contents of the invention [0003] The main purpose of the present invention is to provide a photodetection circuit, a photodetection method and a photodetection device, which solves the problem that the prior art cannot provide a convenient method of photodetection using the ch...

Claims

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Application Information

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Patent Type & Authority Applications(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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