Pixel driving circuit, pixel driving method, display panel and display device
A pixel drive circuit and a technology for driving transistors, which can be used in static indicators, instruments, etc., and can solve problems such as transistor threshold voltage drift, unevenness, and screen chromaticity and grayscale.
Active Publication Date: 2015-02-25
BOE TECH GRP CO LTD +1
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Problems solved by technology
[0006] The main purpose of the present invention is to provide a pixel driving circuit, method, display panel and display device, to solve the problem of crystallization stability and doping uniformity in the manufacturing process of transistors in the existing OLED pixel circuit in voltage driving mode, so that The threshold voltage of some transistors in the OLED pixel circuit drifts, which causes the problem of uneven chromaticity or grayscale of the screen when displaying the screen
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[0032] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0033] like figure 2 As shown, the pixel driving circuit according to the embodiment of the present invention includes a driving transistor TD, a switch control unit 21 and a threshold control unit 22, wherein the driving transistor TD is a floating gate transistor;
[0034] The driving transistor TD has a first pole connected to the driving voltage Vdd, and a second pole connected to the anode of the OLED device O1;
[0035] The switch control unit 21 is respectively connected to the scan signal on the scan line Scan and the data signal on the data line Data, and is connected to the signal gate of the drive transistor TD, for each display period, when the When the scan signal is valid, control the potential of the signal gate of the drive transistor T...
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The invention provides a pixel driving circuit, a pixel driving method, a display panel and a display device. The pixel driving circuit comprises a driving transistor, a switch control unit and a threshold control unit, wherein the driving transistor is a floating gate transistor, the threshold control unit controls to charge the potential of a control gate of the driving transistor to a preset threshold control potential through programmable voltage modulation signals within a display period when scanning signals are effective, and controls to maintain the potential of the control gate of the driving transistor at the preset threshold control potential when the scanning signals are ineffective, so that the threshold voltage of the driving transistor is controlled within a preset threshold voltage range. The pixel driving circuit solves the problem that due to poor crystallization stability and doping uniformity of an existing OLED (organic light emitting diode) pixel circuit in a voltage driving mode during manufacturing of transistors, the threshold voltage of a part of transistors in the OLED pixel circuit drifts to cause uneven chrominance or gray level of images to be displayed.
Description
technical field [0001] The present invention relates to the display field, in particular to a pixel driving circuit, a method, a display panel and a display device. Background technique [0002] OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) devices have the advantages of active light emission, good shock resistance, wide viewing angle, wide operating temperature, high contrast, and flexible display. They are recognized as replacement products in the field of liquid crystal displays. At the same time, As the luminous efficiency and lifespan increase year by year, OLED devices can be widely used in the field of lighting in addition to being used for display. [0003] The basic structure of an OLED device is to sequentially deposit a hole injection layer, a hole transport layer and an electron injection layer between the transparent electrode layer as the anode and the metal layer as the cathode on the substrate. Each layer is an organic semiconductor mater...
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Login to View More IPC IPC(8): G09G3/32G09G3/3208
Inventor 沈奇雨陈旭郭建
Owner BOE TECH GRP CO LTD