AMOLED (active-matrix organic light emitting diode) display device and compensation method thereof

Abstract

The invention provides an AMOLED (active-matrix organic light emitting diode) display device and a compensation method thereof. The display device comprises a pixel unit and a voltage drop compensation unit. The voltage drop compensation unit comprises a control subunit and a detection subunit, wherein the detection subunit is used for acquiring voltage of a power supply node of the pixel unit and sending the voltage to the control subunit; and the control subunit is used for determining voltage variation of the power supply node according to the voltage and standard voltage and modifying data signals of the corresponding pixel unit based on the voltage variation so as to compensate the voltage variation. The AMOLED display device and the compensation method thereof provided by the invention can compensate voltage drop (IR Drop) generated by power supply voltage on a wire, so that the brightness uniformity of an AMOLED display panel can be improved, and a problem of brightness nonuniformity caused by the IR Drop is also solved.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, and in particular relates to an AMOLED display device and a compensation method thereof. Background technique [0002] In recent years, organic light emitting diode (OLED) has become a very popular emerging flat-panel display product at home and abroad, because OLED display has self-illumination, wide viewing angle, short response time, high luminous efficiency, wide color gamut, low It has the characteristics of working voltage, thin panel, large-size and flexible panel and simple manufacturing process, and it also has the potential of low cost. [0003] With the advancement of the times and technology, large-size, high-resolution AMOLED display devices are gradually developed. Correspondingly, large-size AMOLED display devices also require larger-sized panels and a larger number of pixels, and the length of panel wires is getting more and more The longer the wire, the greater th...

AI Technical Summary

Problems solved by technology

[0003] With the advancement of the times and technology, large-size, high-resolution AMOLED display devices are gradually developed. Correspondingly, large-size AMOLED display devices also require larger-sized panels and a larger number of pixels, and the length of panel wires is getting more and more The longer the wire, the greater the resistance of the wire. Therefore, the power supply voltage will inevitably produce a voltage drop (IR Drop) on the wire, and the voltage drop of each pixel circuit is different, resulting in different power supply voltages obtained by each pixel circuit. Therefore, under the same data signal voltage input, different pixel circuits will have different current and brightness output, which will lead to uneven display brightness of the entire panel, and the IR Drop of the pixel will also be different with different screens.

[0004] figure 1 It is a pixel circuit diagram of an AMOLED display device. It is the most common 2T1C structure, which consists of two N-type thin film transistors and a storage capacitor. The pixel circuit of this 2T1C structure can only convert voltage into current to drive organic light emission. The role of diode light, does not have any compensation function

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