Voltage-programmable amoled pixel driving circuit and driving method thereof

Abstract

A voltage-programmable AMOLED pixel driving circuit and its driving method, the pixel circuit includes a driving module, a clearing module, a data input module and a light emitting module. The driving module includes a first transistor and a second transistor, the clearing module consists of a third transistor, the data input module includes a fourth transistor, a first capacitor and a second capacitor, the light emitting module includes a fifth transistor and an organic light emitting diode, and the driving module is The state of the transistor and the voltage compensation are controlled under the action of the data extraction input to make the light-emitting module emit light. The light-emitting elements are driven by setting the first to third scan signals, control signal terminals and data input signals as different inputs in the initialization phase S1, data extraction phase S2, data input phase S3, and light-emitting phase S4 of the pixel circuit. The invention has simple circuit structure and convenient control, can compensate threshold voltage drift, mobility change and circuit voltage drop of transistors, improve display quality and prolong the service life of light-emitting elements.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a voltage-programmed AMOLED pixel drive circuit capable of compensating device threshold voltage variation and power supply voltage drop and a driving method thereof. Background technique [0002] Active-matrix Organic Light Emitting Diode (AMOLED) displays are trying to expand their range of applications, from small mobile displays to large TVs. Compared with the traditional liquid crystal display, AMOLED is widely used because of its advantages of high contrast, fast response time, high resolution, low power consumption, and high brightness. [0003] However, the electron-optical characteristics of the thin-film transistor (TFT), the core device of the AMOLED display, are relatively sensitive. Optoelectronic characteristics such as the threshold voltage of the drive transistor are prone to drift during the crystallization process. These changes can directly lead to the non-u...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a voltage-programmable AMOLED pixel drive circuit and its drive method, which can not only compensate the voltage drop caused by the threshold voltage, mobility and parasitic resistance of the drive transistor, but also avoid OLED Blinking in the non-light-emitting phase, and can reduce the complexity of the wiring in the circuit, effectively improve the programming speed of the pixel circuit, suitable for the needs of large-size, high-resolution display panels

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