Pixel circuit of organic light emitting display

Abstract

The invention discloses a pixel circuit of an organic light emitting display, comprising a first power line, a second power line, a data line, a reference voltage, an organic light emitting diode, a storage capacitor and eight transistors T1-T8, wherein the data line is connected with a source electrode of the T1; a drain electrode of the T1 is connected with a drain electrode of the T2 and a source electrode of the T3; a source electrode of the T2 and a source electrode of the T7 are connected with the first power line; a drain electrode of the T3 is connected with a drain electrode of the T4 and a source electrode of the T5; a drain electrode of the T5 is connected with an anode electrode of the organic light emitting diode; a grid electrode of the T3 and a drain electrode of the T6 are connected with a first end of the storage capacitor; a drain electrode of the T7 and a drain electrode of the T8 are connected with a second end of the storage capacitor; a source electrode of the T8 is connected with the reference voltage; a source electrode of the T6 is connected with the second power line; a grid electrode of the T6 is connected with a first scanning control line; grid electrodes of the T2, the T5 and the T7 are connected with a control line; and grid electrodes of the T1, the T4 and the T8 are connected with a second scanning control line. The pixel circuit disclosed by the invention has the advantages that threshold shift of the driving transistors and the voltage fall of the power lines can be compensated, so that the brightness of the display is more uniform.

Description

technical field [0001] The invention relates to the technical field of organic light-emitting displays, in particular to a pixel circuit of an organic light-emitting display, which can make the brightness of the display more uniform. Background technique [0002] Active organic light-emitting display devices (AMOLEDs) are active light-emitting devices. Compared with the current mainstream flat-panel display technology Thin Film Transistor Liquid Crystal Display (TFT-LCD), AMOLED has the advantages of high contrast, wide viewing angle, low power consumption, and thinner volume. It is expected to become the next-generation flat-panel display technology after LCD. It is one of the most concerned technologies in flat panel display technology. [0003] AMOLED devices made on glass substrates basically include amorphous silicon (a-Si) thin-film transistor (TFT) and low-temperature polysilicon (LTPS) TFT; and LTPS TFT has a higher carrier mobility, smaller The size of the device ...

AI Technical Summary

Problems solved by technology

[0010] The main purpose of the present invention is to provide a pixel circuit of an organic light-emitting display to solve the problem of uneven brightness of the organic light-emitting display caused by the difference in the threshold value of the driving transistor

[0011] The secondary purpose of the present invention is to provide a pixel circuit of an organic light-emitting display to solve the problem of uneven brightness of the organic light-emitting display caused by the voltage drop of the power supply Vdd line

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