Power supply unit for display

Abstract

The present invention relates to a display power supply device for reducing the deviation between displays according to high-voltage adjustment. It is composed of the following parts: a high-voltage fluctuation detection part for detecting the high-voltage fluctuation of a flyback transformer FBT; a deviation difference between a black image and a white image on the screen is detected A camera used for picture adjustment; a microprocessor that outputs a control signal according to the deviation difference between images detected by the camera used for picture adjustment; a high-voltage fluctuation adjustment part that adjusts high-voltage fluctuations according to the microprocessor control signal; The high voltage fluctuation adjustment part is an adder that adds the output signals; the horizontal / vertical synchronization signal processing part controls the screen size adjustment part according to the adder output signal to adjust the high voltage deviation. The present invention reduces the high-voltage adjustment deviation between the displays; reduces the high-voltage variation according to the FBT load of the flyback transformer, thereby having the effect of preventing the screen size from changing.

Description

technical field [0001] The present invention is related to the power supply device of the display, especially related to the power supply device of the display for preventing the change of the picture size caused by the change of the high-voltage current. Background technique [0002] A general monitor is a device that displays an image signal of a specified format transmitted from a connected PC video card on a screen after a series of signal processing such as digital sampling and conversion. [0003] Below, with reference to accompanying drawing, according to the power supply device of traditional technology display, be described as follows: [0004] figure 1 is a schematic block diagram of a power supply device for a display according to conventional technology; [0005] figure 2 It is a circuit block diagram of a high-voltage fluctuation detection part in a power supply device of a display according to the conventional technology. [0006] Power supply devices for ...

AI Technical Summary

Problems solved by technology

[0017] First, the deflection amount of the electron beam changes due to the high voltage fluctuation of the flyback transformer FBT, which causes a change in the screen size

[0018] Second, the deviation H of the white image and the black image varies according to the frequency and resolution of the display, so when designing the display, consider the frequency and resolution of each display, which brings a lot of trouble to the design

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