OLED pixel circuit, display device and control method

Abstract

The invention discloses an OLED pixel circuit, a display device and a control method. The OLED pixel circuit comprises an organic light emitting diode, a driving transistor, a first switch unit, a grid electrode connecting a data signal output terminal with the driving transistor, a second switch unit, a source electrode connecting a power source signal output terminal with the driving transistor, a compensating circuit connected with the grid electrode of the driving transistor and used for maintaining the voltage of the grid electrode of the driving transistor in the light emitting stage to enable the current flowing through the organic light emitting diode to be unrelated to the threshold voltage Vth of the driving transistor and a reference signal generating module used for generating a reference signal for being used by the compensating circuit according to the current threshold voltage of the driving transistor, wherein the voltage of the reference signal and the threshold voltage meet at least one come-into-effect condition enabling the compensating circuit to come into effect. The OLED pixel circuit, the display device and the control method enlarge the compensating range of the compensating circuit.

Description

technical field [0001] The invention relates to display technology, in particular to an OLED pixel circuit, a display device and a control method. Background technique [0002] As far as display devices are concerned, organic light-emitting diodes (Organic Light-Emitting Diode, OLED) have the advantages of self-illumination, high contrast, wide color gamut, etc., and also have the advantages of simple preparation process, low power consumption, and easy realization of flexible display. , becoming an important light-emitting element in emerging flat panel display devices. [0003] In the pixel structure of the OLED display panel, each sub-pixel includes a driving transistor. In the OLED pixel circuit, the current flowing through the OLED is not only controlled by the data signal Vdata, but also affected by the threshold voltage Vth of the driving transistor. [0004] Due to differences in the threshold voltage and mobility of TFTs in multiple pixel circuits, it is impossibl...

AI Technical Summary

Problems solved by technology

From a product point of view, in a product with multiple OLED pixels, since the initial value and variation of the threshold voltage of the driving transistor in each pixel are different, the same threshold voltage compensation circuit is set for each pixel May work for some pixels but not others

In this case, it will obviously affect the uniformity and brightness stability of the organic light-emitting diode display device.

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