CN101246407A - Resistor type touch panel and its method for control static noise - Google Patents
Resistor type touch panel and its method for control static noise Download PDFInfo
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- CN101246407A CN101246407A CNA2007100375676A CN200710037567A CN101246407A CN 101246407 A CN101246407 A CN 101246407A CN A2007100375676 A CNA2007100375676 A CN A2007100375676A CN 200710037567 A CN200710037567 A CN 200710037567A CN 101246407 A CN101246407 A CN 101246407A
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Abstract
A method for controlling electrostatic noise in electric resistance type touch screen comprises scanning touch screen steps by utilizing 100Hz-400Hz low frequency scan signal. Preferably, the low frequency is 250Hz. The invention also provides a electric resistance touch screen which can reduce electrostatic noise and scan signal is 100Hz-400Hz low frequency scan signal. Preferably, the low frequency is 250Hz. The invention also provides an electric resistance type touch screen mobile equipment which can reduce electrostatic noise. The realization of the invention is simple and has versatility, and the invention effectively provides low cost solve scheme. The invention has great practicability and universality and can be applied into all kinds of equipments with electric resistance type touch screen, such as all kinds of handle equipment system with large touch screens.
Description
Technical field
The present invention relates to a kind of resistive touch screen (Touch Panel), especially can reduce the resistive touch screen of noise.
Background technology
At present, system designers more and more with touch-screen applications on various device, for example be located at the multimedia information inquiry system in various public place, various handheld device, for example mobile phone, PDA(Personal Digital Assistant) etc., and on other equipment, the display screen of certain server for example.Since touch-screen have sturdy and durable, reaction velocity fast, save the space, be easy to many advantages such as interchange, therefore it is applied to multimedia inquiry system and makes multimedia messages or control system change to a new form, give multimedia system with brand-new looks, be extremely attractive brand-new multimedia interactive equipment, it is applied to various handheld devices and has then improved the convenience that the user uses these equipment greatly.Therefore, touch-screen is increasingly extensive in the range of application in the whole world.Statistics according to Dataquest company (www.dataquest.com) shows that the 1998 touch-screen sales volumes of being only American market have just surpassed 300,000,000 dollars.
But, very regrettably, in the process of using resistive touch screen,, thereby produced electrostatic field because the friction of the equipment of finger or other contact resistance formula touch-screens produces electric charge.Owing to have sweep signal on the resistive touch screen, therefore, produced electrostatic field loudspeaker effect again.Of a specified duration service time when resistive touch screen, then when opening and closing resistive touch screen, all can spread out of from the resistive touch screen " drone " noise, cause certain puzzlement to the user.
For this reason, proposed the noise that a lot of schemes are used to reduce and even eliminate touch-screen, for example to be " 03103429.2 ", application artificial " Samsung Electronics Co., Ltd ", denomination of invention just proposed a solution for the patent application of " being used to prevent the apparatus and method of the noise of touch-screen " to application number.But this patent application has used a whole set of specific device to reduce the noise of touch-screen, realizes relative complex, and the cost height.
Summary of the invention
The present invention proposes a kind of scheme that more simply can reduce the resistive touch screen noise.
In order to set forth summary of the invention of the present invention better, at first tell about the principle of electrostatic field loudspeaker effect.The electrostatic field speaker design as shown in Figure 1, when two net metal battery lead plates are full of static charge, can between these two battery lead plates, 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 above-mentioned principle as can be known, in the use of the various device of having used resistive touch screen, because a variety of causes, for example use the mobile phone of resistive touch screen to be placed in pocket or the briefcase and caused friction with textile, thereby surface at resistive touch screen, be that the LCD surface produces static charge, finally can pile up electric charge, and then produce electric field in the upper and lower surface of resistive touch screen.At this moment, when the control signal of resistive touch screen occurs, what wherein play main effect is the sweep signal of resistive touch screen, because it uses the sweep frequency of 400Hz at present, (ITO is an indium tin to cause constituting the ITO layer of touch-screen, be indium oxide and tin oxide compound substance, the ITO layer is used to transmit the signal of touch screen scanning) or the frequency of other materials also be 400Hz.Electrostatic field loudspeaker principle according to above-mentioned is appreciated that when resistive touch screen is scanned to produce vibrations, and the main frequency of these vibrations also is 400Hz.The sound intensity that this frequency produced, promptly noise can reach about 3dB (decibel), and the human sense of hearing is very sensitive to the sound of this frequency, thus make the user often hear the noise that resistive touch screen sends.
Based on the above-mentioned theory analysis, the present invention reduces the noise of resistive touch screen effectively by reconciling the sweep signal frequency of resistive touch screen.
A kind of method of controlling static noise in resistive touch screen is provided according to an aspect of the present invention, comprise the steps: to utilize the sweep signal of the lower frequency between the 100Hz to 400Hz to come touch screen scanning, described lower frequency comprises 100Hz and 400Hz.Further, this method also comprises: by reducing the signal frequency of sweep generator, produce the sweep signal of this lower frequency.
According to said method, described lower frequency is 250Hz.
According to another invention of the present invention, a kind of resistive touch screen that can reduce static noise is provided, it is characterized in that the sweep signal of described touch-screen is the low frequency signals of frequency between 100Hz to 400Hz, described lower frequency comprises 100Hz and 400Hz.
According to above-mentioned resistive touch screen provided by the invention, described resistive touch screen comprises sweep generator at least, and described low frequency signals system produces by the signal frequency that reduces sweep generator.
According to above-mentioned resistive touch screen provided by the invention, the initial value of the time cycle of the sweep signal of described low frequency signals system by improving sweep generator produces.
According to above-mentioned resistive touch screen provided by the invention, described lower frequency is 250Hz.
According to another invention of the present invention, a kind of mobile device also is provided, this equipment comprises the above-mentioned resistive touch screen that can reduce static noise.
The adjustment of the frequency of said scanning signals ties up on the basis that has resistive touch screen now and by change the initial value in the cycle in the time interval (polling time) between per twice scanning of touch-screen is realized.
The present invention utilizes the physiological property of people's ear, and the frequency of the sweep signal by adjusting resistive touch screen reduces and even eliminated the noise of resistive touch screen dexterously.And the realization of content of the present invention is simple, and has multiple variation to be achieved, and low cost solution is provided effectively.
Practicality of the present invention is very strong and have very strong versatility, can be applied in the various equipment with resistive touch screen, for example has all kinds of handheld device formula system of big touch-screen.
Description of drawings
Fig. 1 is a principle schematic of describing electrostatic field loudspeaker effect;
Fig. 2 describes the principle schematic that produces electric field on the resistive touch screen;
Fig. 3 is the part-structure figure of resistive touch screen;
Fig. 4 be the sense of hearing of describing the people with frequency, decibel between graph of a relation;
Fig. 5 is the structural drawing of the resistive touch screen of the first embodiment of the present invention; And
Fig. 6 is the scan period synoptic diagram of the first embodiment of the present invention.
Label declaration
11, metal electrode board 12, Insulating frame
13, vibrating diaphragm
2, touch-screen
21, touch-screen main body 22, ITO layer
The decibel value of correspondence when 31, sound frequency is 100Hz
The decibel value of correspondence when 32, sound frequency is 200Hz
The decibel value of correspondence when 33, sound frequency is 400Hz
41, first scanning, 42, second scanning constantly constantly
512, transparent substrates 514, first conductive layer
516, flexible and transparent cover sheets 518, second conductive layer
520, isolating points 530, conductive pattern
6, sweep generator
7, input signal detection device
8, CPU (central processing unit)
Embodiment
With reference to figure 1, it is as having described the principle of electrostatic field loudspeaker effect as described in the summary of the invention part.With reference to figure 1, when two net metal battery lead plates 11 are full of static charge, form stable electric field betwixt, when the signal that adds a variation in some net metal battery lead plates 11 next doors, magnetic field that the signal of this variation changes and then the electric field that changes, with original electric field between two net metal battery lead plates 11 superposition mutually, thereby make two electric fields between the net metal battery lead plate 11 produce equifrequent variation, vibrating diaphragm 13 vibrations in the middle of promoting, pass through air, the sound transmission of this frequency is gone out, thereby form noise.
With reference to figure 2, it describes the principle that produces electric field on the resistive touch screen.The upper and lower surface of touch-screen main body 21 (be screen body of touch screen, for example composition such as organic glass) is ITO layer 22, owing to reasons such as frictions, finally at the surface sediment electric charge of ITO layer 22.With reference to figure 2, piled up positive charge at the upper surface of touch-screen main body 21, lower surface has then been piled up negative charge, and then produces electric field.
Be appreciated that under situation shown in Figure 2 in conjunction with Fig. 1 and Fig. 2, when the user touches described touch-screen main body 21, then can produce vibrations, and then form the sound about 3dB.
With reference to figure 3, it describes the structure of the part of the four-wire resistance type touch screen that exists in the prior art.Touch-screen comprises transparent substrates 512, and this substrate has first conductive layer 514 that limits the touch area, and this conductive layer promptly generally includes aforesaid ITO or other similar conducting polymers (for example polythiophene).Flexible and transparent cover sheets 516 comprises second conductive layer 518 that separates by isolating points 520 and the above-mentioned first conductive layer entity.Have than the resistance of conductive layer 514 conductive pattern 530 low and the qualification fringe region and be arranged on the conductive layer 514 at the opposite edges place of the conductive layer on the transparent substrates 512 514.Conductive pattern 530 provides by the other material layer that electrically contacts with conductive layer 514.Conductive pattern 530 also is arranged to contact with the opposite edges point of conductive layer 518 on the flexible and transparent cover sheets 516 and be positioned at this edge.In touch screen structure shown in Figure 4, when 516 distortion (for example passing through finger pressure) of flexible and transparent cover sheets cause first and second conductive layers 514 and 518 to electrically contact, at this moment, can determine the position of distortion, thereby determine the position of touch by control signals such as sweep signals.
Be appreciated that in structure shown in Figure 3 in conjunction with Fig. 2 and Fig. 3, if two surface aggregations up and down of touch-screen electric charge as shown in Figure 2, then when the user touches described touch-screen main body 21, can produce vibrations, and then also can form the sound about 3dB.
With reference to figure 4, the relation between description people's the sense of hearing and frequency, the decibel.Can learn that with reference to figure 2 resistive touch screen can form the sound about 3dB in the prior art.Again in conjunction with Fig. 3, wherein, the point of crossing shown in the dotted line 31 is the minimum decibel value that sound frequency people's of correspondence when being 100Hz the sense of hearing can be experienced, and this moment, decibel value was also about 3dB, therefore the sense of hearing that is the people can be experienced, and just can experience noise.And the minimum decibel value that the people's of correspondence the sense of hearing can be experienced when to be sound frequency be 200Hz to the point of crossing shown in the dotted line 32, this moment, decibel value surpassed 3dB, therefore in this case, and the noise that people's auditory perception sends less than touch-screen shown in Figure 2; Similarly, the point of crossing shown in the dotted line 33 is the minimum decibel value that sound frequency people's of correspondence when being 100Hz the sense of hearing can be experienced, and this moment, decibel value surpassed 3dB, and therefore in this case, the noise that sends less than touch-screen shown in Figure 2 is also experienced in people's the sense of hearing.
Therefore, be appreciated that the sweep signal frequency to resistive touch screen, can reach the purpose of the noise that reduces resistive touch screen by the present invention.
With reference to figure 5, the structural drawing of the resistive touch screen of its first embodiment of the present invention.In the present embodiment, a resistive touch screen comprises touch-screen 2, also comprise a sweep generator 6, the sweep signal that produces by this sweep generator 6 scans, and obtain an input signal after when touch-screen 2 is touched, detecting by input signal detection device 7, this input signal is sent to CPU (central processing unit) 8, and then can further be handled by CPU (central processing unit), thereby finishes processing procedure to an input signal by this resistive touch screen.
With reference to figure 5, again with reference to above-mentioned Fig. 1 to Fig. 4, those skilled in the art understand, in the present invention, said scanning signals generator 6 is adjusted, can obtain the lower sweep signal of frequencies by this generator 6, the sweep signal of 100～400Hz for example is appreciated that under such frequency in conjunction with Fig. 4 and can reduces the noise that resistive touch screen produces.And those skilled in the art further are appreciated that when the frequency that produces when this sweep generator 6 is 250Hz, and the noise of the applied mobile device of resistive touch screen that uses such sweep generator is with smaller, thus the more excellent effect of acquisition.
With reference to figure 6, it has described the scan period synoptic diagram of the first embodiment of the present invention.Wherein, 41 systems carry out the scanning first time to touch-screen in the first scanning moment, and carry out the scanning second time at the second scanning moment, 42 pairs of touch-screens, and the interval between twice scanning is the time cycle that system scans touch-screen.And those skilled in the art will appreciate that by adjusting this cycle sweep time, just can correspondingly change the sweep frequency of touch-screen, thereby realize purpose of the present invention.
The present invention may be better understood in order to make those skilled in the art, specifies the process that realizes the resistive touch screen sweep signal of lower frequency by software below by one embodiment of the present of invention.In the present embodiment, the applied equipment of touch-screen has adopted Windows CE operating system, and operating system is set scan period of touch-screen by the EnableTouchTimerInterrupt function, and for example, corresponding source code is as follows in the prior art:
#define?TOUCH_TIMER_INCREMENT 0x2400
EnableTouchTimerInterrupt(TOUCH_TIMER_INCREMENT)；
In the present embodiment, the clock frequency of forming the crystal of touch-screen is 3686400Hz, so sweep frequency is 3686400/0x2400=400Hz, formed noise is discovered by the people easily.
Correspondingly, in the present embodiment, above-mentioned source code is amended as follows:
#define?TOUCH_TIMER_INCREMENT 0x9000
EnableTouchTimerInterrupt(TOUCH_TIMER_INCREMENT)；
Therefore, the sweep frequency of the touch-screen that produced of sweep generator 6 is: 3686400/0x9000=100Hz.Therefore, realized content of the present invention.
Those skilled in the art will appreciate that above-mentioned low frequency signals also can obtain by the signal frequency that other modes reduce sweep generator, does not repeat them here.
Again with reference to figure 3 and the foregoing description, be appreciated that, for example a mobile device (for example mobile phone) has used the touch-screen of structure as shown in Figure 3, then produce the touch-screen sweep signal of lower frequency according to the mode of the foregoing description, thereby just can realize purpose of the present invention by operating system or other Control Software of using in this mobile device of controlling touch-screens.
Although the present invention is illustrated with aforesaid preferred embodiment, but the foregoing description is not to be used for limiting the present invention, any technician that this field is familiar with, enlightenment according to design philosophy of the present invention, concrete summary of the invention and embodiment, should various changes and adjustment, and by these changes with adjust resulting new content and should be contained by content of the present invention.
Claims (8)
1. the method for a control static noise in resistive touch screen is characterized in that, comprises the steps:
-utilize the sweep signal of the lower frequency between the 100Hz to 400Hz to come touch screen scanning.
2. method according to claim 1 is characterized in that, also comprises:
-by reducing the signal frequency of sweep generator, produce the sweep signal of this lower frequency.
3. method as claimed in claim 1 or 2 is characterized in that, described lower frequency is 250Hz.
4. the resistive touch screen that can reduce static noise is characterized in that, the sweep signal of described touch-screen is the low frequency signals between the 100Hz to 400Hz.
5. resistive touch screen as claimed in claim 5 is characterized in that, comprises sweep generator, and described low frequency signals system produces by the signal frequency that reduces sweep generator.
6. resistive touch screen as claimed in claim 6 is characterized in that, the initial value of the time cycle of the sweep signal of described low frequency signals system by improving sweep generator produces.
7. as each described resistive touch screen in the claim 4 to 6, it is characterized in that described lower frequency is 250Hz.
8. a mobile device is characterized in that, comprises as each described resistive touch screen in the claim 4 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100375676A CN101246407B (en) | 2007-02-14 | 2007-02-14 | Resistor type touch panel and its method for control static noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100375676A CN101246407B (en) | 2007-02-14 | 2007-02-14 | Resistor type touch panel and its method for control static noise |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101246407A true CN101246407A (en) | 2008-08-20 |
| CN101246407B CN101246407B (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100375676A Expired - Fee Related CN101246407B (en) | 2007-02-14 | 2007-02-14 | Resistor type touch panel and its method for control static noise |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043518A (en) * | 2009-10-14 | 2011-05-04 | Nec卡西欧移动通信株式会社 | Electronic device and recording medium |
| CN102788910A (en) * | 2012-06-29 | 2012-11-21 | 敦泰科技有限公司 | Noise detection, scanning and frequency hopping method of mutual capacitance touch screen |
| CN108170310A (en) * | 2017-12-26 | 2018-06-15 | 维沃移动通信有限公司 | A kind of touch screen control method and mobile terminal |
| CN108874248A (en) * | 2018-05-25 | 2018-11-23 | 厦门天马微电子有限公司 | A kind of driving method and relevant apparatus of touch screen |
| CN109413254A (en) * | 2018-12-19 | 2019-03-01 | 上海中航光电子有限公司 | A kind of method and system for the current noise improving touch control terminal |
-
2007
- 2007-02-14 CN CN2007100375676A patent/CN101246407B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043518A (en) * | 2009-10-14 | 2011-05-04 | Nec卡西欧移动通信株式会社 | Electronic device and recording medium |
| CN102043518B (en) * | 2009-10-14 | 2015-11-25 | 联想创新有限公司（香港) | Electronic equipment and recording medium |
| CN102788910A (en) * | 2012-06-29 | 2012-11-21 | 敦泰科技有限公司 | Noise detection, scanning and frequency hopping method of mutual capacitance touch screen |
| CN108170310A (en) * | 2017-12-26 | 2018-06-15 | 维沃移动通信有限公司 | A kind of touch screen control method and mobile terminal |
| CN108170310B (en) * | 2017-12-26 | 2021-06-18 | 维沃移动通信有限公司 | Touch screen control method and mobile terminal |
| CN108874248A (en) * | 2018-05-25 | 2018-11-23 | 厦门天马微电子有限公司 | A kind of driving method and relevant apparatus of touch screen |
| CN109413254A (en) * | 2018-12-19 | 2019-03-01 | 上海中航光电子有限公司 | A kind of method and system for the current noise improving touch control terminal |
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| Publication number | Publication date |
|---|---|
| CN101246407B (en) | 2012-07-11 |
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