Pixel compensation circuit and display device

Abstract

Embodiments of the present invention provide a pixel compensation circuit and a display device. A pixel compensation circuit includes a light emitting element and a driving circuit. The driving circuit is coupled to the light-emitting element to provide a forward current to drive the light-emitting element to work in a linear rising region, wherein the light-emitting element compensates the current forward current of the light-emitting element according to the current temperature of the light-emitting element, so that the external quantum efficiency of the light-emitting element It is between N times and M times of the preset external quantum efficiency. A display device includes a plurality of pixel compensation circuits, wherein each pixel compensation circuit has a light-emitting element and a driving circuit, and the driving circuit is used to drive the light-emitting element to work in a linear rising area. The light-emitting element compensates the current forward current of the light-emitting element according to the current temperature of the light-emitting element, so that the external quantum efficiency of the light-emitting element is between N times and M times of the preset external quantum efficiency.

Description

technical field [0001] The present invention relates to a pixel compensation circuit and a display device, and in particular to a pixel compensation circuit and a display device with self-temperature compensation and threshold voltage compensation. Background technique [0002] With the popularization of flat-panel displays, various types of flat-panel displays come out one after another. Whether it is a mini LED, a micro LED or an organic light emitting diode (OLED), it can be used as a pixel of a display device, and is suitable for a large-size or high-resolution panel. Since the light-emitting diode is a current-driven component, the brightness of the light-emitting diode is determined according to the magnitude of the forward current. Generally, a thin film transistor (TFT) is used to adjust the magnitude of the driving current to control the brightness of the light-emitting diode, thereby controlling the brightness of the display. [0003] However, thin film transisto...

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Problems solved by technology

Therefore, when the temperature changes, for example, when the temperature rises, the forward voltage of the light-emitting diode will decrease due to the increase in temperature, and the forward current will increase due to the decrease in forward voltage, but the external quantum efficiency will decrease due to the increase in temperature. Rise and drop sharply, so that the display device will cause uneven brightness due to uneven temperature distribution

[0004] Therefore, how to provide a method that can compensate the variation problem of the critical voltage shift of the driving transistor, and at the same time compensate the variation problem of the decrease of the external quantum efficiency of the light-emitting diode due to the temperature rise, so as to avoid the display device from causing the display device due to the above factors. The overall uneven brightness of the display panel on the screen will be the focus of this case and the focus of its solution.

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