Ambient light monitoring circuit and display panel with same
A technology for monitoring circuits and ambient light, applied to static indicators, instruments, etc., can solve the problems of incompletely consistent threshold voltage, unfavorable full screen, insufficient reading accuracy and uniformity of ambient light intensity, etc., to improve reading Effects of Accuracy and Uniformity
Active Publication Date: 2022-03-11
WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
[0003]
The traditional ambient light monitoring circuit is generally an independent circuit module, which is installed outside the display panel. However, this structure is not conducive to the realization of a full screen, and the ambient light monitoring of the display panel is not accurate enough. Therefore, an integrated ambient light monitoring circuit has been adopted. The way inside the display panel, which requires the production of ambient light monitoring circuit on the display panel
However, the thin-film transistors used to make display panels, especially low-temperature polysilicon (LTPS) thin-film transistors, have the inherent problem of non-uniform threshold voltages, that is, the threshold voltages of each LTPS thin-film transistors are not completely consistent. At the same time, with the long-term use of the display panel, its The thin-film transistors above will have a threshold voltage drift due to electrical stress, that is, the threshold voltage of each thin-film transistor will drift with the aging of the thin-film transistor. The above two points will cause the ambient light monitoring circuit to drift due to the threshold voltage of the drive transistor. Or non-uniformity makes the output voltage unstable, resulting in insufficient reading accuracy and uniformity of the ambient light intensity in various areas of the display panel
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.
[0030] In all the embodiments of the present invention, two electrodes other than the gate of the transistor are distinguished, one of which is called the source, and the other is called the drain. Since the source and drain of a transistor are symmetrical, its source and drain are interchangeable. According to the form in the accompanying drawings, it is stipulated that the middle terminal of the transistor is the gate, the signal input terminal is the source terminal,...
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The invention provides an ambient light monitoring circuit and a display panel with the ambient light monitoring circuit, and the ambient light monitoring circuit detects the threshold voltage of a driving module through the mutual cooperation of a detection module and a compensation module when measuring ambient light. The threshold voltage of the driving module is compensated in the process of outputting the output voltage and the output current which reflect the change condition of the photo-generated leakage current of the photodiode through the reading module, so that the ambient light monitoring is not influenced by the drift or non-uniformity of the threshold voltage of the driving module; and the reading accuracy and uniformity of the ambient light intensity of each area of the display panel are improved.
Description
technical field [0001] The invention relates to the field of display technology, in particular to an ambient light monitoring circuit and a display panel with the ambient light monitoring circuit. Background technique [0002] The ambient light monitoring circuit is an important part of the display device. It can adjust the brightness of the display panel according to the real-time brightness of the ambient light, so as to ensure that the human eye is in the best visual experience. The circuit will increase the brightness of the display panel to increase the contrast of the display panel and ensure the degree of visible cleanliness; while indoors or places with low light, the ambient light monitoring circuit will reduce the brightness of the display panel to avoid the display panel being too bright and harmful to people. The eye produces strong stimulation, causing discomfort, and also reduces the power consumption of the display panel. [0003] The traditional ambient ligh...
Claims
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Login to View More IPC IPC(8): G09G3/20
CPCG09G3/20G09G2320/0626
Inventor 田超
Owner WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD