Method for reducing power-supply ripples of active matrix light-emitting display

Abstract

The invention discloses a method for reducing power-supply ripples of an active matrix light-emitting display, comprising the following steps of: a) obtaining equivalent series inductance ESL, equivalent series resistance ESR and capacitance c of a panel parasitic capacitor of the active matrix light-emitting display varying with frequency, and obtaining a conversion factor a from a gray-scale level to a load level of a display panel; b) taking frame or line as unit to count the gray-scale level N to be displayed of each frame or each line, and estimating the load level; c) calculating a load equivalent voltage drop Vdroop according to the estimated load level; d) generating an offset voltage Voffset by serially connected L, R and C, wherein the Voffset is almost equal to the load equivalent voltage drop Vdroop; and e) outputting the offset voltage by a power supply module, and displaying the current frame or line. In the method for reducing the power-supply ripples of the active matrix light-emitting display, the load equivalent voltage drop is estimated and compensated, so that negative effect caused by the power-supply ripples is reduced, and image quality is improved.

Description

technical field [0001] The invention relates to a method for power supply ripple, in particular to a method for reducing the power supply ripple of an active matrix light-emitting display. Background technique [0002] An organic light emitting display device (OLED) is an active light emitting device. Compared with the current mainstream flat-panel display technology Thin Film Transistor Liquid Crystal Display (TFT-LCD), OLED has the advantages of high contrast, wide viewing angle, low power consumption, and thinner volume. It is expected to become the next-generation flat-panel display technology after LCD. It is one of the most concerned technologies in flat panel display technology. [0003] Such as figure 1 , is a common architecture diagram of an active matrix light-emitting display drive circuit. The signals coming in from the interface connector include power supply VDD, data signals and control signals. The power supply VDD passes through the DC-DC converter 101, ...

AI Technical Summary

Problems solved by technology

Therefore, it takes a certain amount of time to restore the power supply, but at the same time, the panel changes once every frame, accompanied by the transmission of blank data for one frame, and, within one frame, each line is switched once, and the working characteristics of the transmission of blank data for each line are determined. The power supply has a relatively large load change before and after the frame scan synchronization signal STV, and at the edge of the line scan synchronization signal, so it will cause instantaneous changes in each group of power supplies

[0008] The inability to quickly return to the original potential value due to the instantaneous voltage change will cause many negative effects, including deterioration of pixel response characteristics, distortion of gray-scale information, unbalanced image quality, gray-scale crosstalk (Crosstalk), green payment (Greenish), etc. bad

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