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Method and apparatus for prevention of interference video

A technology to prevent interference and images, applied in the direction of instruments, static indicators, etc., can solve the problems of uneven picture, water ripples, interfere with image signals, etc., and achieve the effect of avoiding the phenomenon of water ripples.

Inactive Publication Date: 2010-09-08
HANNSTAR DISPLAY CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since the lighting device uses high voltage to light the cold-cathode lamp, the instant when it is turned on and off will interfere with the image signal, resulting in partial or overall unevenness of the picture and the formation of water ripples.

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  • Method and apparatus for prevention of interference video
  • Method and apparatus for prevention of interference video
  • Method and apparatus for prevention of interference video

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Embodiment Construction

[0019] The image signal includes various video signals, such as voltage and current amplitude, gain, frequency, power, etc. When analyzing the image signal, the image signal with many frequencies can be mathematically transformed, such as Fourier transform, to present it in the frequency domain, thereby displaying the characteristics of the image signal in the frequency domain.

[0020] FIG. 1 is a spectrum diagram presented in the frequency domain after performing Fourier transform on an image signal according to an embodiment of the present invention. The horizontal axis is frequency, and the vertical axis is amplitude. According to the spectrogram, there is no signal transmission between any two adjacent multiplied frequencies, such as between the 1-octaved frequency 101 and the 2-octaved frequency 102 or between the 2-octaved frequency 102 and the 3-octaved frequency 103 . In other words, if the spectrum of the working signal of the lamp lighter of the light source and th...

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Abstract

A method capable of preventing video interference is used for prevent a lamp tube control signal of a liquid crystal display from interfering a video signal, the method comprises adjusting the frequency of the liquid crystal lamp tube control signal, so that the frequency spectrum of the control signal is interlaced with the frequency spectrum of the video signal.

Description

technical field [0001] The invention relates to a display and its driving method, and especially designs a display and its driving method capable of overcoming image signal interference. Background technique [0002] An Inverter is a high-voltage converter that converts current from DC to AC, and is used to light up the light source of the display, such as the cold cathode lamp (CCFL) that lights up the panel. [0003] Traditionally, there are two ways to light the CCFL, one is continuous mode of driving the lamp (Continue mode), and the other is mode of intermittently driving the lamp (Burst mode). Among them, the way of continuously driving the lighter to light up consumes a large amount of power. Therefore, in the current environment where environmental protection awareness is rising, the mode of intermittently driving the lighter to light up has gradually become the mainstream. [0004] However, since the lighting device uses high voltage to light the cold-cathode lamp,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/34
Inventor 蔡玄德
Owner HANNSTAR DISPLAY CORPORATION