Pixel driving circuit of organic light-emitting display

Abstract

The invention provides a pixel driving circuit of an organic light-emitting display. The pixel driving circuit of the organic light-emitting display is characterized by comprising a first transistor, a second transistor, a third transistor and a fourth transistor. The first transistor is controlled by a scanning driving signal, and data signals and reference voltage signals can be transmitted to an electrode plate of a capacitor under the control of the first transistor; the second transistor is electrically connected with a second electrode plate of the capacitor and is used for determining the magnitude of driving currents, and the driving currents are determined by the aid of voltage difference between a gate and a drain of the second transistor; the third transistor is electrically connected with the second electrode plate of the capacitor and the second transistor and is controlled by a first driving signal, and the gate and the drain of the second transistor can be switched on or switched off under the control of the third transistor; the fourth transistor is electrically connected with the second transistor and the third transistor and is controlled by a second driving signal, and the driving currents from the second transistor can be transmitted to an organic light-emitting element under the control of the fourth transistor.

Description

technical field [0001] The invention relates to the field of organic light emitting displays, in particular to a pixel driving circuit of an organic light emitting display. Background technique [0002] An organic light emitting display (organic light emitting display, OLED) is a thin-film light-emitting device made of organic semiconductor materials and driven by a direct current voltage, which has the characteristic of self-luminescence. OLEDs are primarily made with thin coatings of organic materials and glass substrates, and do not require a backlight. Therefore, these organic materials actively emit light when there is an electrical current path. [0003] Since the OLED is driven by current, the brightness of the OLED is related to the magnitude of the current flowing through the OLED, so the electrical performance of the thin-film transistor (TFT) used as the driver will directly affect the display effect of the above-mentioned OLED, especially The threshold voltage ...

AI Technical Summary

Problems solved by technology

However, the data voltage signal and the reference voltage signal of the existing OLED pixel compensation circuit need to use different wiring inputs, and the data voltage signal and the reference voltage signal respectively need a TFT for timing control output

Therefore, the existing OLED pixel compensation circuit needs to use more components (such as transistors), which not only increases the wiring cost, but also increases the complexity of the circuit

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