Pixel compensation circuit and AMOLED display apparatus

Abstract

The invention provides a pixel compensation circuit and an AMOLED display apparatus. The pixel compensation circuit comprises a data signal writing module, a high-voltage signal writing module, a first reference voltage writing module, a second reference voltage writing module, a voltage maintaining module, a driving transistor, a capacitor and a luminescent device. The data signal writing module is connected with the first end of the capacitor; the first reference voltage writing module is connected with the control electrode of the driving transistor, and the second reference voltage writing module is connected with the drain electrode of the driving transistor; the high-voltage signal writing module is connected with the second end of the capacitor; the voltage maintaining module is connected with the first end and the control electrode of the driving transistor; the source electrode of the driving transistor is connected with the second end of the capacitor, and the drain electrode is connected with the anode of the luminescent device; and the cathode of the luminescent device is connected with a common grounding electrode. The pixel compensation circuit provided by the invention can prevent the luminescent device from brightness change in a luminescence process, and improves the brightness uniformity in the luminescence process.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel compensation circuit and an AMOLED display device. Background technique [0002] The flat panel display device has many advantages such as thin body, power saving, and no radiation, and thus has been widely used. Existing flat panel display devices mainly include liquid crystal display (Liquid Crystal Display, hereinafter referred to as LCD) and organic light emitting diode (Organic Light Emitting Diode, hereinafter referred to as OLED) display devices. [0003] The OLED display device achieves display through self-luminescence, so it does not require a backlight source, and has high contrast, small thickness, wide viewing angle, fast response speed, can be made into a flexible display panel, wide operating temperature range, and relatively simple structure and manufacturing process. characteristics, it is regarded as a next-generation display device that can re...

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned AMOLED display device, the organic light emitting diode D is driven according to the current generated by the second transistor T2 in a saturated state; and due to the unevenness of the TFT manufacturing process, the threshold voltage of the second transistor T2 in each pixel is different, and, due to the second transistor T2 The threshold voltage Vth of the second transistor T2 will drift to different degrees during the light-emitting process of the organic light-emitting diode D. When the above-mentioned 2T1C driving circuit is used for driving, the brightness uniformity of each pixel is very poor, resulting in uneven display.

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