A driving method of a pixel circuit of an active organic electroluminescence display

Abstract

The invention discloses a method for driving a pixel circuit of an active organic electroluminescence displayer. The method comprises a plurality of major cycles and each major cycle comprises N frames. In the first frame, programming is conducted through an initialization stage, a threshold voltage latching stage, a data loading stage and an organic light-emitting diode lighting stage, wherein the threshold voltage latching stage is separated from a signal scanning stage; in the second frame to the Nth frame, programming is conducted only through an data loading stage and an organic light-emitting diode lighting stage. In terms of a whole pixel array, when an initialization step of pixels on the ith row is completed, the initialization step of pixels on the i+1th row is conducted. According to the method for driving the pixel circuit of the active organic electroluminescence displayer, threshold voltage drift of a driving transistor and degeneration of an organic light-emitting diode can be made up, the display quality is guaranteed, the power consumption can also be reduced, and the programming speed is effectively improved.

Description

technical field [0001] The invention relates to a pixel driving technology of an active organic electroluminescent display, in particular to a driving method of a pixel circuit of an active organic electroluminescent display. Background technique [0002] Active Matrix Organic Light Emitting Diode (Active Matrix Organic Light Emitting Diode: AMOLED) is an emerging flat panel display technology, due to its simple preparation process, low cost, fast response speed, low power consumption, easy to achieve matching with integrated circuit drivers, and high luminous brightness , Wide range of working temperature, light and thin volume, easy to realize flexible display and large-screen display, etc., have broad market prospects, and have been widely valued by scientists and industries in the field of flat panel display. [0003] Active matrix driving techniques can be classified into current programming mode and voltage programming mode. When the current programming is at low brig...

AI Technical Summary

Problems solved by technology

However, because this method latches the threshold voltages of certain rows at the same time, in a large period, the light-emitting time of the last frame of these rows is different, and the light-emitting time of the same pixel in the last frame period is the same as The previous frame period is also different, which makes the display effect worse, and the timing of the driving scheme is more complicated

The third is to use a latch programming method (see the published invention patent CN103117041A), and its driving method is as follows Figure 4 As shown, although the programming speed of this method can reach the programming speed of the traditional 2T1C pixel circuit in N cycles after one latch, the programming speed and The programming speed of the general pixel compensation circuit is almost the same, which causes the programming speed of the first frame and the following frame to be different in a large cycle, so that the OLED light-emitting time of each row is different, and in a large cycle, the same The light-emitting time of the first frame and the last frame of the row is different from the light-emitting time of the frame period that does not require the threshold voltage latch stage, which affects the display effect

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