AMOLED (active matrix/organic light emitting diode) display and driving method of AMOLED display

Abstract

The invention relates to an AMOLED (active matrix / organic light emitting diode) display and a driving method of the AMOLED display. The AMOLED display is provided with a compensation unit as well as a row driver and a column driver which are connected with a pixel array, wherein the compensation unit is provided with an overlaying device connected with a time sequence controller, the time sequence controller is also connected with the row driver, and the overlaying device is connected with a memory, an A / D (Analog to Digital) converter, a I / V converter and the column driver; each pixel unit of the pixel array comprises a first switch conducting element and a second switch conducting element, wherein the data conducting pins of the first switch conducting element are connected with the control pins of the column driver and a drive conducting element respectively; a capacitor is arranged between the input pin and the control pin of the drive conducting element; the input pins and the output pins of the second switch conducting element are connected with the output pins of the drive conducting element, the I / V converter and the A / D converter respectively. According to the AMOLED display and the driving method, a plurality of factors causing the image quality degradation can be compensated, the image display quality of the AMOLED display is improved, and the AMOLED display is simple in circuit structure.

Description

technical field [0001] The present invention relates to a display and a driving method for the display, specifically an AMOLED display and a driving method thereof. Background technique [0002] In flat panel display technology, organic light-emitting diode display (OLED) is recognized as the successor by the industry due to its thinness, active light emission, fast response speed, wide viewing angle, rich color and high brightness, low power consumption, and high and low temperature resistance. The third generation of display technology after Liquid Crystal Display (LCD). According to the driving method, OLED is divided into passive OLED (PMOLED, also known as passive matrix OLED) and active OLED (AMOLED, also known as active matrix OLED). Among them, AMOLED is driven by integrating a thin film transistor (TFT) and a capacitor in each pixel and maintaining the voltage by the capacitor. AMOLED can realize large-size, high-resolution panels, which is the focus of current re...

AI Technical Summary

Problems solved by technology

AMOLED can realize large-size, high-resolution panels, which is the focus of current research and the development direction of future display technology, but it is technically difficult to realize the driving method to control the degradation of image quality, and requires high cost

[0003] Due to the non-uniformity of the threshold voltage and electron mobility of the driving transistor that controls the light emission of each pixel of the AMOLED display, and the threshold voltage will also drift with time, so that under the same data signal, the current flowing through the OLED occurs The deviation leads to uneven display brightness (MURA); the luminous efficiency of the organic light-emitting diode (OLED) itself will also degrade over time, so that the luminous brightness decreases under the same current, resulting in image retention; the leakage current of the driving transistor causes the AMOLED display to fail. True reproduction of low-gray-scale images; the attenuation of the voltage by the power line impedance of the driving transistor also causes the brightness of the OLED to decrease

All these factors are important reasons for the deterioration of the image quality of AMOLED displays

Although the industry has also proposed drive compensation methods for some of the above reasons, one method can generally only compensate for image quality degradation caused by one or several of these factors, and these methods require thin-film transistors (TFTs) in pixel drive circuits. The number is large, and there is no method in the known technology that can compensate for all the above-mentioned factors that cause image quality degradation and requires less pixel circuit TFT

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