Compensation method and compensation circuit for AMOLED threshold voltage

Abstract

The invention provides a compensation method and a compensation circuit for AMOLED threshold voltage. The compensation circuit comprises a scanning transistor, a driving transistor, a light emitting control transistor, an initialization transistor and a zero clearing transistor, wherein the scanning transistor controls whether image data are input into a pixel unit, the grid electrode of the scanning transistor receives scanning signals, and the drain electrode of the scanning transistor receiving the image data; the driving transistor drives an OLED to emit light according to the image data, and the grid electrode of the driving transistor is connected with the source electrode of the scanning transistor; the light emitting control transistor controls connection and disconnection between the driving transistor and the OLED, the grid electrode of the light emitting control transistor receives light emitting control signals, the drain electrode of the light emitting control transistor is connected with the source electrode of the driving transistor, and the source electrode of the light emitting control transistor is connected with the positive electrode of the OLED; the initialization transistor controls initialization voltage of the positive electrode of the OLED, the drain electrode of the initialization transistor is connected with the initialization voltage, the source electrode of the initialization transistor is connected with the positive electrode of the OLED, and the grid electrode of the initialization transistor receives initialization control signals; the zero clearing transistor carries out zero clearing on electric charges between the grid electrode and the source electrode of the driving transistor, the drain electrode of the zero clearing transistor is connected with the grid electrode of the driving transistor, the source electrode of the zero clearing transistor is connected with the source electrode of the driving transistor, and the grid electrode of the zero clearing transistor receives the initialization control signals. By means of the compensation method and the compensation circuit for the AMOLED threshold voltage, compensation for the threshold voltage of a driving tube is achieved, and bad influences, from back flushing voltage caused by stray capacitance, on driving current are reduced.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and relates to a compensation circuit and a method, in particular to a compensation method and a compensation circuit for an AMOLED threshold voltage. Background technique [0002] Compared with traditional liquid crystal panels, AMOLED (Active Matrix / Organic Light Emitting Diode, active matrix organic light emitting diode panel) has the characteristics of faster response speed, higher contrast ratio, and wider viewing angle. The driving of AMOLED is the key to OLED display technology. At present, there are some problems in AMOLED. For example, due to the influence of LTPS (Low Temperature Poly-silicon, low temperature polysilicon) TFT (Thin Film Transistor, Thin Film Field Effect Transistor) process, the threshold voltage Vth of the driving TFT in different spatial positions is likely to be different. Same. For a-Si, the threshold voltage of hydrogenated amorphous silicon TFTs (hydrog...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a compensation method and compensation circuit for the AMOLED threshold voltage, which is used to solve the problem that the prior art cannot compensate the threshold voltage of the drive tube while reducing the OLED anode point. The impact of the kickback voltage on the drive current caused by the parasitic capacitance between the gate and the drive tube

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