AMOLED pixel driving circuit, driving method and display panel

Abstract

The invention provides an AMOLED pixel driving circuit, a driving method and a display panel. The AMOLED pixel driving circuit comprises a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a sixth thin film transistor (T6), a storage capacitor (C) and an organic light emitting diode (OLED). The AMOLED pixel driving circuit only has a data signal writing and threshold voltage compensation stage (A1) and a light emitting stage (A2). According to the embodiment of the invention, the design of the pixel driving circuit with a 6T1C structure is adopted, compensation and AMOLED anode reset are completed at the same time through data signal writing, the driving time sequence is simplified, the load of a scanning signal line is reduced, the signal attenuation is reduced, and the high refresh rate of the AMOLED pixel driving circuit is further realized.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an AMOLED pixel driving circuit, a driving method and a display panel. Background technique [0002] Active Matrix Organic Light Emitting Display (OLED) display panel with self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, near 180° viewing angle, and wide operating temperature range , can realize many advantages such as flexible display and large-area full-color display, and is recognized by the industry as a display device with the most development potential. The AMOLED display panel has a plurality of pixels arranged in an array, and each pixel is driven by an OLED pixel driving circuit. Since the threshold voltage Vth of the driving thin film transistor tends to drift, the driving current changes, which easily causes uneven brightness of the AMOLED display panel, resulting in poor display and affecting image ...

AI Technical Summary

Problems solved by technology

Since the above three stages are carried out in sequence to complete the light emission of a row of pixels, it is difficult to increase the refresh rate of pixels

Another reason is that there are a lot of thin film transistors in the current pixel circuit, and each pixel needs at least three scanning lines (scanning signal line Scan, light emission control line EM, and reset signal line Reset), resulting in each scanning line and data line. The parasitic capacitance is large, and the load of the wiring is too large, which can easily lead to large signal attenuation, which is also a reason why the refresh rate cannot be improved.

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