CN101131486B

CN101131486B - Method for eliminating electrostatic noise of handhold equipment big screen LCD

Info

Publication number: CN101131486B
Application number: CN200610030300XA
Authority: CN
Inventors: 郑文义; 夏涛
Original assignee: Inventec Appliances Shanghai Corp
Current assignee: Inventec Appliances Shanghai Corp
Priority date: 2006-08-23
Filing date: 2006-08-23
Publication date: 2010-09-15
Anticipated expiration: 2026-08-23
Also published as: CN101131486A

Abstract

The invention relates to a method to remove the static noise in LCD of hand device. It includes: measuring to get the LCD pels scanning lines N, setting the pels time signal frequency f acting on the compound material of indium oxide and tin oxide in LCD of hand device to make it fill the equation: 0.5X(f/N) is greater than or equal to 16KHz. The static noise frequency can higher than the sound frequency range which the human can hear by adjusting the LCD scanning signal frequency; while the process is simple and convenience; especially, it is proper for all kinds of hand device with big LCD to bring convenience for people life and work and settle the stable foundation for the LCD development.

Description

The method of eliminating electrostatic noise of handhold equipment big screen LCD

Technical field

The present invention relates to the handheld device field, the particularly large-screen lc display technique field on the handheld device specifically is meant a kind of method of eliminating electrostatic noise of handhold equipment big screen LCD.

Background technology

The LCDs (LCD) of hand held handheld device is increasing at present, and often all is with touch panel (touchpanel).In use, because friction produces electric charge, thereby produced electrostatic field.Add the sweep signal on the LCD, produced electrostatic field loudspeaker effect, so service time is of a specified duration, the user will hear drone the different sound of LCD when opening screen.

At first introduce electrostatic field loudspeaker effect, see also shown in Figure 1, this figure is an electrostatic field speaker design synoptic diagram, when two net metal battery lead plates are full of static charge, can between them, produce stable electric field, when the signal that adds a variation is by some net metal battery lead plates, because the magnetic field that the signal of this variation can change, and the electric field that the magnetic field of this variation can change, with original electric field between two net metal battery lead plates superposition mutually, thereby make two electric fields between the net metal battery lead plate produce equifrequent variation, vibrating plate vibrations in the middle of promoting, by air, the sound transmission of this frequency is gone out.

Use this principle as can be known, in the use of mobile phone,,, produce static charge, finally can pile up electric charge, produce electric field, as shown in Figure 2 in the upper and lower surface of touch panel (Touch panel) on the LCD surface usually with the clothing friction owing to place relation.

The different sound that this LCD produces all is insufferable for the comparatively sensitive user of some sense of hearing, its meeting exerts an influence to the mood that people manipulate this handheld device, disturb the normal thinking activities of people, even other people around can disturbing, brought very big inconvenience so just for people's work and life.

Summary of the invention

The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, a kind of method of eliminating electrostatic noise of handhold equipment big screen LCD is provided, can give the influence that people caused by this electrostatic noise of ingenious elimination.

In order to realize above-mentioned purpose, the method for eliminating electrostatic noise of handhold equipment big screen LCD of the present invention is as follows:

The method of this eliminating electrostatic noise of handhold equipment big screen LCD, big screen LCD on the described handheld device comprises the indium oxide and the tin oxide composite layer of pixel signal control, its principal feature is that described method may further comprise the steps:

(1) measures the number of scanning lines N that obtains the LCDs pixel;

(2) indium oxide that acts on LCDs in the handheld device and the pixel clock signal frequency f on the tin oxide composite layer are set, make it satisfy following relation:

0.5×(f/N)≥16KHz。

In the step of the method for this eliminating electrostatic noise of handhold equipment big screen LCD (2), the pass that indium oxide that acts on LCDs in the handheld device and the pixel clock signal frequency f on the tin oxide composite layer satisfy is:

0.5×(f/N)＝16.7KHz。

The method of this eliminating electrostatic noise of handhold equipment big screen LCD the indium oxide that acts on LCDs in the handheld device is set and the pixel clock signal frequency f on the tin oxide composite layer is:

With the macro definition of representing the pixel clock signal frequency is frequency values f.

Adopted the method for the eliminating electrostatic noise of handhold equipment big screen LCD of this invention, since utilized people's ear the limited physiological property of sound frequency that can perceive, adjust handheld device and act on the indium oxide of LCDs and the pixel clock signal frequency on the tin oxide composite layer, the frequency of LCD sweep signal just, make the frequency of its electrostatic noise that produces exceed people's ear the scope of the sound frequency that can perceive, the ingenious interference problem of electrostatic noise of having eliminated to the user; The process of this method is simple, convenient and practical simultaneously, has very strong versatility, the scope of application is comparatively extensive, be specially adapted to various handheld device formula systems with giant-screen, bring great convenience for people's live and work, for the further developing of LCDs technology of handheld device established solid foundation.

Description of drawings

Fig. 1 is the structural design synoptic diagram of electrostatic field loudspeaker.

Fig. 2 is the static charge distribution schematic diagram of the LCDs with touch panel of handheld device in the prior art.

Fig. 3 perceptibility curve synoptic diagram of ear of behaving to different frequency sound.

Embodiment

In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.

The method of this eliminating electrostatic noise of handhold equipment big screen LCD, the big screen LCD on the described handheld device comprise the indium oxide and the tin oxide composite layer of pixel signal control, and wherein, described method may further comprise the steps:

(1) measures the number of scanning lines N that obtains the LCDs pixel;

0.5×(f/N)≥16KHz。

Wherein, the satisfied best relation of indium oxide that acts on LCDs in the handheld device and the pixel clock signal frequency f on the tin oxide composite layer is:

0.5×(f/N)＝16.7KHz。

When indium oxide that acts on LCDs in the handheld device and the pixel clock signal frequency f on the tin oxide composite layer specifically were set, corresponding method was:

In the middle of reality is used, see also shown in Figure 3, because in the control signal of LCD, the most important thing is pixel clock (Pixelclock) signal, in the prior art, what use is the pixel clock signal of 6MHz, because LCD commonly used uses is 240 * 240 resolution, and ITO layer (indium oxide and tin oxide composite layer) is mainly used in the signal controlling of each pixel (Pixel) above the LCD, and the signal frequency on this ITO layer is FVCOM=0.5 * row clock frequency=0.5 * (6MHz/240)=12.5KHz just.According to above-mentioned electrostatic field loudspeaker principle, when opening screen, touch panel (TouchPanel) will shake, main frequency is exactly 12.5KHz, sound intensity in this frequency can reach about 3dB, and according to Fig. 3 as can be known, the people that ear is very sensitive just might hear.

Thereby, can know according to Fig. 3, if the frequency of noise is improved,, on the basis that does not change noise loudness, also can allow the user can't hear this noise because the physiological property of people's ear is insensitive to the sound of high frequency.So solution of the present invention is exactly that the pixel clock signal frequency is adjusted to 8MHz by original 6MHz, when opening screen, noise frequency is just brought up to FVCOM=0.5 * row clock frequency=0.5 * (8MHz/240)=16.7KHz by original 12.5KHz like this.

As shown in Figure 3, the frequency of 3dB is that the above noise of 16KHz almost can not be perceived by the human ear, thereby has solved this problem cleverly.

In actual applications, the code below the concrete settling mode of application method of the present invention sees also on handheld device:

This code is that the resolution of LCD is 320X320 based on present popular hand-held platform Window CE,

(1) original operation code (the pixel clock signal frequency is 5.8MHz)

#define LS024B7DW_PIXEL_CLOCK_FREQUENCY580//will represent the macro definition of pixel clock signal frequency is 5.80MHz

PCD＝((LCLK/LS024B7DW_PIXEL_CLOCK_FREQUENCY)+1)/2；

p_LCDRegs->LCCR3＝0

|LCD_PCD(PCD)

|LCD_ACB(0x00)

|LCD_API(0x0)

|LCD_VSP

|LCD_HSP

|LCD_PCP

|LCD_BPP(BPP)

|LCD_PDFOR(pXllpLCD->PixelDataFormat)

|0；

(2) operation code (the pixel clock signal frequency changes 8MHz into by 5.8MHz) after the improvement

#define LS024B7DW_PIXEL_CLOCK_FREQUENCY800//will represent the macro definition of pixel clock signal frequency is 8.00MHz

PCD＝((LCLK/LS024B7DW_PIXEL_CLOCK_FREQUENCY)+1)/2；

p_LCDRegs->LCCR3＝0

|LCD_PCD(PCD)

|LCD_ACB(0x00)

|LCD_API(0x0)

|LCD_VSP

|LCD_HSP

|LCD_PCP

|LCD_BPP(BPP)

|LCD_PDFOR(pXllpLCD->PixelDataFormat)

|0；

Adopted the method for above-mentioned eliminating electrostatic noise of handhold equipment big screen LCD, since utilized people's ear the limited physiological property of sound frequency that can perceive, adjust handheld device and act on the indium oxide of LCDs and the pixel clock signal frequency on the tin oxide composite layer, the frequency of LCD sweep signal just, make the frequency of its electrostatic noise that produces exceed people's ear the scope of the sound frequency that can perceive, the ingenious interference problem of electrostatic noise of having eliminated to the user; The process of this method is simple, convenient and practical simultaneously, has very strong versatility, the scope of application is comparatively extensive, be specially adapted to various handheld device formula systems with giant-screen, bring great convenience for people's live and work, for the further developing of LCDs technology of handheld device established solid foundation.

In this instructions, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.

Claims

1. the method for an eliminating electrostatic noise of handhold equipment big screen LCD, big screen LCD on the described handheld device comprises the indium oxide and the tin oxide composite layer of pixel signal control, it is characterized in that described method may further comprise the steps:

(1) measures the number of scanning lines N that obtains the LCDs pixel;

0.5×(f/N)≥16KHz。

2. the method for eliminating electrostatic noise of handhold equipment big screen LCD according to claim 1, it is characterized in that, in the described step (2), the pass that indium oxide that acts on LCDs in the handheld device and the pixel clock signal frequency f on the tin oxide composite layer satisfy is:

0.5×(f/N)＝16.7KHz。