Pixel circuit, display device and driving method thereof
A technology of a pixel circuit and a driving tube, which is applied in the fields of display devices and their driving, and pixel circuits, can solve the problems of discrete threshold voltage of the driving tube, uneven brightness, etc., and achieves reduced adverse effects, high circuit integration, and is conducive to layout design. Effect
Pending Publication Date: 2022-08-09
天宜微电子(北京)有限公司
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Problems solved by technology
[0005] In view of the above problems, the object of the present invention is to provide a pixel circuit, a display device and a driving method thereof, so as to solve the problem of uneven brightness caused by the dispersion of the threshold voltage of the driving tube and the voltage drop of the power supply, and to facilitate the circuit layout design
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[0024] The present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, like elements are designated by like reference numerals. For the sake of clarity, various parts in the figures have not been drawn to scale. Additionally, some well-known parts may not be shown in the drawings.
[0025] Numerous specific details of the present invention are described below, such as device structures, materials, dimensions, processing techniques and techniques, in order to provide a clearer understanding of the present invention. However, as can be understood by one skilled in the art, the present invention may be practiced without these specific details.
[0026] It should be understood that A and B are connected / coupled in the embodiments of the present application, indicating that A and B can be connected in series or in parallel, or A and B pass through other devices, which are not limited in the embodiments of the prese...
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The invention discloses a pixel circuit, a display device and a driving method thereof. The pixel circuit includes: a light emitting element; the first switching tube is used for controlling data voltage writing; the second switching tube controls the light-emitting time of the light-emitting element; the third switch tube is used for controlling the initialization of the driving tube; the fourth switching tube resets the voltage of the anode of the light-emitting element; the first capacitor and the second capacitor are connected in series between the data voltage and the stable signal source and are used for storing the actual threshold voltage of the driving tube and the attenuated data voltage; the driving tube enables the light-emitting element to emit light, and the second capacitor is electrically isolated from the light-emitting element in the write-in stage. According to the pixel circuit provided by the invention, the problem of uneven brightness caused by discrete threshold voltage of the driving tube and voltage drop of the power supply is solved, the range of the gamma voltage is expanded, the coupling effect caused by the second capacitor is avoided, and the layout design of the circuit is facilitated.
Description
technical field [0001] The present invention relates to the field of display technology, and more particularly, to a pixel circuit, a display device and a driving method thereof. Background technique [0002] OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) is widely used in the field of display devices due to its characteristics of self-luminescence, wide viewing angle display, fast response, and can be fabricated on a flexible substrate. [0003] In the current display panel, due to the different threshold voltages of the driving transistors between different pixel circuits, or the drift of the threshold voltages of the driving transistors in the pixel circuits over time, the current of the light-emitting element OLED of each pixel circuit will be different, thereby causing The display panel has poor uniformity of display brightness and poor picture quality. [0004] Therefore, a pixel circuit needs to be designed to solve the above technical problems. ...
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Login to View More IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G2300/088G09G2320/0276G09G2320/0233G09G2320/066G09G2310/0243G09G2320/0257G09G2310/0251G09G2300/0861G09G2300/0819G09G2300/0852G09G3/3233G09G2320/043G09G2310/0262G09G3/3258G09G2310/08G09G2320/0223
Inventor 孙丽娜
Owner 天宜微电子(北京)有限公司