Pixel driving circuit and driving method thereof, display panel and display device
A pixel driving circuit and technology for driving transistors, which are applied in the field of display panels and display devices, pixel driving circuits and driving methods thereof, can solve the problems of complex pixel driving circuits, unfavorable improvement of PPI, and poor brightness uniformity, so as to improve pixel density, The effect of simplifying the structure and improving the uniformity
Active Publication Date: 2022-04-22
HEFEI BOE DISPLAY TECH CO LTD +1
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Problems solved by technology
Since the threshold voltages of the driving transistors are not completely the same, the driving currents flowing through the organic light-emitting diodes in the AMOLED display are also not completely the same, resulting in poor brightness uniformity of the organic light-emitting display panel when displaying images.
[0005] In addition, in order to eliminate the influence caused by the threshold voltage difference of the driving transistor in the existing AMOLED pixel driving circuit, the structural design of the pixel driving circuit is usually more complex and occupies a large area, which is not conducive to improving the PPI (pixel density)
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[0055] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.
[0056] figure 1 is a circuit diagram of a pixel driving circuit according to a first embodiment of the present invention.
[0057] refer to figure 1 As shown, the pixel driving circuit is used to drive the light emitting device D to emit light, including:
[0058] The threshold voltage compensation and charging unit 1 includes a sampling transistor T1, the first pole of the sampling transisto...
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The present invention provides a pixel driving circuit and its driving method, a display panel and a display device. The pixel driving circuit includes: a threshold voltage compensation and charging unit, a reset unit, a drive transistor and a storage unit; in the reset phase, the reset unit is turned on, The reference voltage is transmitted to the intermediate node; in the threshold voltage compensation and charging phase, the data signal line and the intermediate node are turned on, and the voltage of the intermediate node is configured as the data signal voltage collected when the sampling transistor is short-circuited as a diode, and transmitted to the driving transistor. The gate and the first end of the storage unit are charged; in the light-emitting phase, the driving transistor provides driving current to the light-emitting device according to the voltage of the intermediate node held by the first end of the storage unit. According to the embodiments of the present invention, the uniformity of image brightness in the display area of the display panel and the display device can be improved. In addition, the luminescence control unit and the circuit providing control signals for the luminescence control unit are omitted, which is beneficial for the display panel to achieve a narrow frame.
Description
technical field [0001] The present invention relates to the technical field of display devices, in particular to a pixel driving circuit and a driving method thereof, a display panel and a display device. Background technique [0002] With the extensive development of display technologies, organic light-emitting diode (Organic Light-Emitting Diode, OLED) displays are increasingly used in various electronic devices. As the size of the traditional passive matrix organic electroluminescent display tube (Passive Matrix OLED) increases, the driving time of a single pixel needs to be shorter, so the transient current needs to be increased and the power consumption is increased. At the same time, the application of high current will cause an excessive voltage drop on the ITO metal oxide line, and make the working voltage of the OLED too high, thereby reducing its lifespan. However, an active matrix organic electroluminescent display tube (ActiveMatrixOLED, AMOLED) can solve these ...
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IPC IPC(8): G09G3/3233
CPCG09G3/3233
Inventor 孔超刘冬李方庆赵洁
Owner HEFEI BOE DISPLAY TECH CO LTD