Photoelectric detection circuit, display panel and display device
A technology for photoelectric detection and display panel, applied in the field of photoelectric detection, can solve the problems of large noise of photoelectric signal, distortion of photoelectric signal, reduction of photoelectric detection accuracy, etc., and achieve the effect of improving detection accuracy, improving detection efficiency, and avoiding photoelectric signal distortion
Active Publication Date: 2019-12-03
BOE TECH GRP CO LTD
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Problems solved by technology
[0003] Embodiments of the present invention provide a photoelectric detection circuit, a display panel, and a display device, which are used to solve the problem that the read photoelectric signal has relatively large noise due to the influence of the leakage current of the TFT in the prior art, resulting in distortion of the photoelectric signal, making the The problem of photoelectric detection accuracy reduction
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[0030] In order to make the object, technical solution and advantages of the present invention more clear, the specific implementation manners of the photoelectric detection circuit, display panel and display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, not to limit the present invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0031] An embodiment of the present invention provides a photoelectric detection circuit, such as figure 1 As shown, it includes: a photodetector 10, a signal input module 20 and a signal detection module 30; wherein,
[0032] The negative pole 10a of the photodetector 10 is connected to the reference voltage terminal VREF, ...
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The invention discloses a photoelectric detection circuit, a display panel and a display device. The photoelectric detection circuit comprises a photoelectric detector, a signal input module and a signal detection module, wherein the photoelectric detector is in a reverse biased connection state, a current flowing through the photoelectric detector can be increased when light illuminates the photoelectric detector, the signal input module is used for supplying detection signals of a detection signal input end to the signal detection module under control of a scanning signal end, and the signal detection module is used for outputting the detection signals only when the photoelectric detector is illuminated by the light. Therefore, compared with a conventional photoelectric detection circuit in which photoelectric signals generated by the photoelectric detector are large in noise, the photoelectric detection circuit disclosed in an embodiment of the invention is advantageous in that a problem of photoelectric signal distortion caused by the large-noise photoelectric signals can be prevented, photoelectric detection precision can be effectively improved, and optical detection efficiency can be enhanced.
Description
technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a photoelectric detection circuit, a display panel and a display device. Background technique [0002] At present, the photosensors in the pixels of the display panel generally use a photodiode that converts optical signals into electrical signals to connect with a thin film transistor (Thin Film Transistor, TFT). The photoelectric signal output to realize the detection of photoelectric signal. However, since the current of the photoelectric signal generated by the photodiode is small, and the TFT itself has a certain leakage current, the TFT has a large off-state current. Therefore, when reading the photoelectric signal of a specific pixel, due to the influence of the leakage current of the TFT of the photosensor of other pixels, the read photoelectric signal has relatively large noise, resulting in distortion of the photoelectric signal, thereby reducing the ph...
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IPC IPC(8): G01R19/00H01L27/12H01L27/15H01L27/144
CPCG01R19/0092H01L27/12H01L27/1446H01L27/15
Inventor 李东升孙建明吴慧利李士佩任庆荣
Owner BOE TECH GRP CO LTD