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Light sensing circuit and driving method thereof, display panel and display device

A display panel and light-sensing technology, applied to static indicators, instruments, etc., can solve the problems of unfavorable display panel thinning, poor signal-to-noise ratio, and photodiode light-sensing insensitivity, etc.

Active Publication Date: 2019-04-26
XIAMEN TIANMA MICRO ELECTRONICS
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AI Technical Summary

Problems solved by technology

[0004] However, due to the multi-layer structure of the photodiode, the manufacturing process of the display panel is complicated, and it is not conducive to the thinning of the display panel.
At the same time, the photodiode is relatively insensitive to light sensing and needs to be designed with a larger area, which is not conducive to improving the light transmittance of the display device.
Moreover, the transistors in the light-sensing circuit in the prior art are all manufactured using LTPS (LowTemperature Poly-silicon, low-temperature polysilicon) technology, resulting in large leakage current in the circuit, poor signal-to-noise ratio, and reducing the accuracy of the light-sensing circuit.

Method used

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  • Light sensing circuit and driving method thereof, display panel and display device
  • Light sensing circuit and driving method thereof, display panel and display device
  • Light sensing circuit and driving method thereof, display panel and display device

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Embodiment Construction

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0026] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

[0027] In all examples shown and discussed herein, any specific values ​​should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have dif...

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Abstract

The invention discloses a light sensing circuit and a driving method thereof, a display panel and a display device, belonging to the technical field of display. The light sensing circuit comprises that: the gate of a first transistor is electrically connected to a first control terminal, the first pole is electrically connected to a first voltage terminal, and the second pole is electrically connected to a first node; the gate of a second transistor is electrically connected to the first node, the first pole is electrically connected to a second voltage terminal, and the second pole is electrically connected to the first pole of a third transistor; the gate of the third transistor is electrically connected to a second control terminal, and the second pole is electrically connected to a data line; the gate of a fourth transistor is electrically connected to a third control terminal, the first pole is coupled to the first node, and the second pole is electrically connected to a third voltage terminal; the first transistor and the fourth transistor comprise active layers formed of metal oxide, and the fourth transistor is multiplexed into a light sensing element; and the second transistor and the third transistor comprise active layers formed of polysilicon. Compared with the prior art, the invention is advantageous to reduce the process steps and thin the display panel.

Description

technical field [0001] The present invention relates to the field of display technology, and more specifically, to a photosensitive circuit and a driving method thereof, a display panel and a display device. Background technique [0002] With the development of social economy, the functions of display devices are becoming more and more abundant. For example, the display device provided by the prior art has a fingerprint identification function, which improves the security of the display device and improves the user experience. [0003] In a display device provided in the prior art, a photodiode is integrated into a display panel to realize a fingerprint recognition function. Wherein, a light-sensing circuit is arranged in the display panel, and the light-sensing circuit is used to drive the photodiode. [0004] However, since the photodiode has many film layers, the manufacturing process of the display panel is complicated, and it is not conducive to the thinning of the di...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3208G09G3/34G09G3/36
CPCG09G3/32G09G3/3208G09G3/344G09G3/36
Inventor 李杰良柯周霖
Owner XIAMEN TIANMA MICRO ELECTRONICS
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