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Light intensity detection unit, light intensity detection method and display device

A technology of light intensity detection and photocurrent, which is used in measuring devices, photometry, optical radiation measurement, etc., and can solve the problems of low light intensity detection accuracy and increased noise of photosensitive devices

Active Publication Date: 2017-11-03
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the photosensitive devices for light intensity detection are all in the bias state. Due to the characteristics of the photosensitive device, there is always a dark current in the photosensitive device in the bias state, and the dark current will increase the noise in the photosensitive device, resulting in a decrease in light intensity. The detection accuracy is not high

Method used

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  • Light intensity detection unit, light intensity detection method and display device
  • Light intensity detection unit, light intensity detection method and display device
  • Light intensity detection unit, light intensity detection method and display device

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Experimental program
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Embodiment 1

[0054] figure 2 A schematic structural diagram of the light intensity detection unit provided in Embodiment 1 of the present invention, as shown in figure 2 As shown, the light intensity detection unit provided by Embodiment 1 of the present invention includes: a photosensitive device, an input module, a feedback module, an amplification module and an output module.

[0055] Specifically, the photosensitive device is connected to the first power supply terminal VDD and the first node a, and is used to collect optical signals and convert the collected optical signals into photocurrents; the input module is connected to the signal input terminal VIN and the first power supply terminal VDD is connected to the first node a, and is used to provide the signal of the first power supply terminal VDD to the first node a under the control of the signal input terminal VIN; the amplification module is connected with the first power supply terminal VDD, the second power supply terminal V...

Embodiment 2

[0076] Based on the inventive concepts of the foregoing embodiments, Figure 7 The flow chart of the light intensity detection method provided by Embodiment 2 of the present invention, such as Figure 7 As shown, Embodiment 2 of the present invention provides a light intensity detection method, which is realized by using the light intensity detection unit provided in Embodiment 1, and specifically includes the following steps:

[0077] Step 100, the control input module provides the signal of the first power supply terminal to the first node.

[0078] Specifically, controlling the input module to provide the first node with the signal of the first power supply terminal includes: inputting a high-level signal to the signal input terminal; and the potential of the input high-level signal is greater than the threshold voltage of the first transistor or the threshold voltage of the second transistor threshold voltage.

[0079] Step 200, when the photosensitive device is illumina...

Embodiment 3

[0088] Based on the inventive concepts of the foregoing embodiments, Figure 8 A schematic structural diagram of a display device provided in Embodiment 3 of the present invention, as shown in Figure 8 As shown, Embodiment 3 of the present invention provides a display device, including: scan lines and data lines arranged crosswise, the scan lines and data lines define pixel areas 1 arranged in an array, and at least one pixel area 1 includes a light intensity detection Unit 2.

[0089] Specifically, the light intensity detection units are arranged in an array, and the light intensity detection units located in the same row or column are connected to the same reading signal line.

[0090] Wherein, the light intensity detection unit 2 in this embodiment is the light intensity detection unit provided in Embodiment 1, and its implementation principle and implementation effect are similar and will not be repeated here.

[0091] Specifically, the display device includes: a displa...

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Abstract

The embodiments of the invention disclose a light intensity detection unit, a light intensity detection method and a display device. The light detection unit includes a photosensitive device, an input module used for providing a signal of a first power end for a first node under the control of a signal input end, an amplification module used for outputting a signal of a second power end to a second node under the control of the first node, a feedback module used for controlling the potential of the second node under the control of a signal reset end, and an output module used for outputting a signal of the second node under the control of a reading control end. According to the technical scheme, under cooperation of the input module, the amplification module, the feedback module and the output module, the potentials at the two ends of the photosensitive device are kept at the same level in the photoelectric conversion process of the photosensitive device. Therefore, the photosensitive device is in a zero-bias state, there is no dark current in the photosensitive device, noise brought by the dark current in the photosensitive device is eliminated, and the accuracy of light intensity detection is improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of display technology, and in particular to a light intensity detection unit, a light intensity detection method, and a display device. Background technique [0002] With the development of display technology, the display effect of display devices is getting better and better, which brings people a good visual experience. However, due to the improvement of living standards, people's requirements for display devices are not limited to display effects, but also require Diversified functions, for example, the function of adjusting the brightness of the display screen according to the intensity of the external ambient light and the function of biometric identification. [0003] Specifically, in order to realize the function of adjusting the brightness of the display screen according to the intensity of the external ambient light, it is usually necessary to use a photosensitive device for light intens...

Claims

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Application Information

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IPC IPC(8): G01J1/42G09G5/10G06V40/13
CPCG01J1/42G09G5/10G01J1/44G01J1/4204G01J2001/446G06V40/13G01J1/46H03K17/6871G09G2360/144G06V40/1318
Inventor 丁小梁王海生刘英明曹学友韩艳玲张平
Owner BOE TECH GRP CO LTD
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