Voltage driving pixel circuit, driving method thereof and organic lighting emitting display (OLED)

Abstract

A voltage-driving pixel unit comprises a voltage-driving pixel circuit and an organic light emitting diode (OLED) driven by the voltage-driving pixel circuit is provided. The voltage-driving pixel circuit comprises a gate line, a data line, a power source line, a ground terminal, a switching transistor, a driving transistor, a compensating transistor, a blocking transistor and a storage capacitor.

Description

technical field [0001] The present invention relates to organic light-emitting display technology, in particular to a voltage-driven pixel circuit, a driving method thereof, and an organic light-emitting display device. Background technique [0002] One of the ways to realize a large-size organic light-emitting diode display (Organic Light-Emitting Diode, hereinafter referred to as: OLED) is to use an active matrix thin film transistor backplane. The active matrix includes an array of pixels defined by the crossing of gate lines and data lines. Each pixel includes an active device such as a transistor. The gate line provides a selection signal to turn on the transistor, and the data line provides The voltage signal, and then the driving transistor drives the OLED device in the pixel to display and emit light. After a long time of voltage driving, the transistor stress effect usually occurs on the drive transistor, and its threshold voltage drifts, which in turn causes the c...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned prior art voltage-driven pixel circuit still has the following technical defects: figure 1 In the voltage-driven pixel circuit shown in the writing sequence, the driving transistor 203 is in the conduction state, so that the node B is charged and the potential rises, thereby reducing the voltage across the storage capacitor 204; The input threshold voltage reduces the compensation for the threshold voltage of the drive transistor 203, which may still affect the current driving the OLED230, thereby affecting the luminous brightness of the OLED230, resulting in poor display quality.

Images