A detection voltage correction method of an AMOLED pixel driving circuit

Abstract

The invention relates to a detection voltage correction method of an AMOLED pixel driving circuit. The AMOLED pixel driving circuit comprises a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a first capacitor (Cst) and an organic light emitting diode (D1). The detection voltage correction method of the AMOLED pixel driving circuit comprisesthe following steps of step 10, collecting detection parameters of the AMOLED pixel driving circuit; step 20, establishing a detection voltage (Vsamp) correction coefficient lookup table related to the row number of the AMOLED pixel driving circuit; and step 30, correcting the detection voltage (Vsamp) by using a lookup table according to the row number of the AMOLED pixel driving circuit. According to the detection voltage correction method for the AMOLED pixel driving circuit, the detection error of the AMOLED pixel driving circuit can be reduced, and the threshold voltage detection result of each row of pixels can be corrected, so that the threshold voltage detection error is reduced.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a detection voltage correction method of an AMOLED pixel drive circuit. Background technique [0002] Organic light-emitting diode (OLED) display devices have many advantages such as self-luminescence, low driving voltage, high luminous efficiency, short response time, and wide operating temperature range, and are recognized by the industry as the display device with the most development potential. [0003] The OLED display panel can be divided into two types according to the driving method: passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED). Among them, the AMOLED panel has pixels arranged in an array, belongs to the active display type, has high luminous efficiency, and is usually used in large-sized display devices with high definition. [0004] AMOLED occupies the mid-to-high-end market in the panel industry, and consumers ...

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Problems solved by technology

Depend on Figure 4 It can be seen that in the threshold voltage detection stage, the voltage Vs of the pixel A and the pixel B at the second node s starts to climb. For the threshold voltage detection, when the detection circuit uses the detection pin ADC to sample, the detection line current trend Close to 0, at this time it can be considered that the detection voltage Vsamp is equal to the voltage Vs; since the closer to the source driver, the effective display area impedance R2 of the detection line is smaller, so the same column of pixels connected to the same detection line is connected to the source The impedance of the driver is inconsistent; the difference in the impedance R2 of the effective display area will affect the climbing speed of the voltage Vs, resulting in an error in the voltage Vs between the pixels in the odd and even columns of the same row, such as pixel A and pixel B, thus affecting the threshold voltage Vth detection test results; Figure 5 The error in the detection result of the threshold voltage Vth of the pixels at different positions on the panel is represented by grayscale. Since the source driver must be arranged on the upper and lower sides of the panel, the error in the detection result of the threshold voltage Vth of the AMOLED pixel drive circuit is caused. Under the test conditions, the threshold voltage detection result of pixel A is smaller than that of pixel B

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