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Method for reducing display audio noise and drive device thereof

A display driver, audio noise technology, applied to static indicators, instruments, etc., can solve problems such as increased circuit costs, poor communication quality, and impact on display quality, and achieve the effect of reducing audio noise

Inactive Publication Date: 2009-04-15
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For general applications of small-sized mobile devices, such as mobile phones, since the LCD screen is close to the user's ear during a call, the audio noise will affect the user's listening and deteriorate the communication quality
[0006] In order to solve this problem, the known technology uses methods such as changing the scanning time of the scanning line, reducing the charging time, etc., but all of them will affect the display quality or increase the cost of changing the design of the circuit

Method used

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  • Method for reducing display audio noise and drive device thereof
  • Method for reducing display audio noise and drive device thereof
  • Method for reducing display audio noise and drive device thereof

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Embodiment Construction

[0025] One of the technical features of the present invention is to use the spread spectrum method to adjust the frequency of the substrate voltage VCOM so that the frequency will not be fixed at 7.5kHz. Thereby, the frequency of occurrence of the frequency 7.5kHz is reduced and its sound intensity is reduced. In order to adjust the frequency of the substrate voltage VCOM, the charging time of each scan line is reduced, that is, the width of the output enable signal (or reference signal) OEV is increased to adjust the frequency of the substrate voltage VCOM. Next, the content of the present invention is described with multiple embodiments.

[0026] image 3 A schematic diagram showing the concept of reducing audio noise of a display according to an embodiment of the present invention. It can be known from the foregoing that the inversion of the substrate voltage VCOM is performed along with the horizontal synchronization signal HSD, and is in the high level state of the outp...

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Abstract

A method for reducing audio noise of a display comprises the following steps: generating a horizontal synchronizing signal, generating a reference signal and generating a substrate voltage signal. The high level state of the reference signal has a predetermined width; the substrate voltage signal switches the state according to each scanning line corresponding to the horizontal synchronizing signal; during each period of the substrate voltage signal, a rising edge and a falling edge of the substrate voltage signal switches the state based on the high level state of the reference signal, and the state switching time of the rising edge and the falling edge is antedated or delayed based on the reference value of the high level state.

Description

technical field [0001] The invention relates to a method for reducing the audio noise of a display, and in particular to a method for reducing the audio noise of a liquid crystal display. Background technique [0002] Generally speaking, the liquid crystal display device uses an inversion driving method to drive each scanning line on the display area, and by inverting the scanning lines, the problem of residual DC bias voltage on the liquid crystal screen is eliminated. In practice, the liquid crystals are driven by voltages with opposite polarities on the same scanning line in adjacent frames. To achieve this, the drive circuit must simultaneously invert the drive voltage and the LCD panel voltage. [0003] figure 1 A timing diagram of a known liquid crystal display driving method is shown. As shown in the figure, in order to realize the polarity reversal of the scanning line driving voltage, the substrate voltage VCOM must be reversed along with the horizontal synchroni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
Inventor 郑富元江嘉胤
Owner NOVATEK MICROELECTRONICS CORP
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