CN101206548B - Infrared touch panel triggered using touch force and detecting method thereof - Google Patents
Infrared touch panel triggered using touch force and detecting method thereof Download PDFInfo
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Abstract
The invention discloses an infrared touch screen triggered by a touch force and a method for detecting the same. A vibration detection system composed of a vibration sensor and a matching signal processing circuit is arranged on a mechanical structure component inside the touch screen; the signal output end of the vibration detection system is connected with a micro controller system of the touch screen through an I/O interface. The core part composes the vibration sensor is a strain gage arranged on a cantilever with a counterweight or a piezoelectric element having the same structure as the strain gage. The core of the method lie in that: only when an electrical signal output by the vibration detection system is detected, the touch screen starts to detect the touching object or outputs the detected data and judges whether the touching object can be detected successively to judge whether a touch operation is finished. The invention has the advantages of a mature technology, low costs, etc., can effectively filter the interference of false triggering caused by bugs, floaters, etc. and is capable of prolonging greatly the service life of the touch screen.
Description
Technical field
The present invention relates to sensing measurement and signal processing technology field, especially a kind of pick-up unit that is used for the vibration that touch force produced of infrared touch panel.
Technical background
Infrared touch panel has been a very proven technique, uses very extensive.The United States Patent (USP) 3764813,3775560,3860754,6439857 and the patent No. are a lot of technology that Chinese patents such as 00121462.4,00250806.0,00200147.6,00262072.3,01202252.7,200420093591.3,200420117952.3 or application have provided infrared touch panel, comprise various improved technical schemes.But in practical application, existing infrared touch panel all has a shortcoming: the interference that promptly can not differentiate the environment object.Such as a winged insect of dropping on the screen, perhaps larger-size floating thing, and other accidental stop etc., the screen that all possibly be touched thinks that people's finger is touching, and causes misoperation.This can not be allowed at some special occasions.Number is 200610011193.6 one Chinese patent application, has provided a kind of technical scheme of utilizing foil gauge and acoustic pickup to come senses touch power and being confirmed touch operation by the vibration that touch force produced.Though this technical scheme can solve the problem of above-mentioned false triggering, some shortcomings are arranged also.At first, if use foil gauge, in general will use semiconductor gauge could obtain enough sensitivity, but also want the multi-disc polyphone, this has just increased the components and parts cost of product; If secondly use acoustic pickup to detect vibration,, then receive the interference of touch-screen ambient noise easily because the frequency band of acoustic pickup is very wide; Just need can increase production cost equally if eliminate this interference at the more cost of input aspect circuit design and the signal Processing.
Summary of the invention
The object of the invention; Be exactly to the defective of above-mentioned existing product with technology; Provide a kind of cheaply, can effectively reduce even eliminate the technical scheme of ambient noise interference, be used for infrared touch panel and detect the vibration that produces by touch force, to confirm touch operation.
To achieve these goals; Inside at infrared touch panel of the present invention; Used a cover by the vibration transducer on the construction package that is installed in infrared touch panel, and the mechanical vibration detection system that signal processing circuit constituted that is complementary with said vibration transducer; The signal output part of this system is connected with an I/O port of described micro controller system; Above-mentioned mechanical vibration detection system is applied in and includes by frame, the construction package that is installed in the circuit board in the frame and is used to protect the glass plate of display to constitute; And arrange some infrared emission and the infrared receiving tube of installing, and be used to drive said infrared transmitting tube and be used to handle photosignal that infrared receiving tube exports and the infrared touch panel that micro controller system constituted of exporting testing result along the rectangle opposite side of said frame.
In the present invention, the vibration transducer in the described mechanical vibration detection system has two kinds:
First kind, be by one one end be installed in one on the pedestal semi-girder, be installed in semi-girder surface foil gauge, be installed in the vibration detection assembly that balance weight body constituted of the semi-girder other end;
Second kind; Vibration transducer in the described mechanical vibration detection system is the vibration detection assembly that balance weight body constituted of the other end that is installed in the semi-girder that is made up of piezoelectric on the pedestal and is installed in said piezoelectric semi-girder by a slice one end.
According to the different difference of the relation of the installation between the frame in the said structure assembly, circuit board and the cover glass plate; Vibration transducer among the present invention can be installed in different positions through pedestal: transmit the vibration that touch force produced that is applied on the said glass plate if the mechanical mounting structure between this three can be decayed lessly; Europe is with good, and then vibration transducer can be installed in arbitrarily on the surface of this thrin of circuit board in the inner or frame of edge, the frame of the cover glass plate in the said construction package; If the mechanical resistance Buddhist nun between this three is bigger, then vibration transducer should be installed in the minimum perhaps edge of small construction parts of the vibration damping that touch force or touch force are produced, like the edge of glass plate, the surface of printed circuit board (PCB).
If use the core component of foil gauge as vibration transducer; Because foil gauge all has temperature drift; The false triggering of therefore wafing and being produced for fear of this temperature is so on the signalling channel of the signal processing circuit that matches, should be connected with the capacitor of isolating the warm DC component of wafing; If use the core component of piezoelectric as vibration transducer; Vibration signal that piezoelectric produces must be an ac signal so; So with also should be connected with capacitor on the signalling channel of the signal processing circuit of its coupling, avoid false triggering to isolate the direct current signal that other reasons produces.
Can know from the technical scheme of top description; The core physical construction of vibration transducer is a semi-girder; Therefore this sub-systems has the resonance frequency of itself; After the effect of receiving external impact force, can be according to the resonance frequency free oscillation of oneself, this itself can guarantee basically that the interference of other noise can not picked up.If but touch-screen is operated in very under the rugged environment; Other noise away from the vibration transducer resonance frequency; Comprise that electromagnetic noise also might be picked up by vibration transducer; Therefore in order further to guarantee the accuracy of detection signal; In the signal processing circuit that said and vibration transducer are complementary, can also include the BPF. that the resonance frequency of a centre frequency and vibration transducer self is complementary, be used for other electric signal that is produced like electromagnetism, the strong noise jamming of environment of filtering.
Because under the general operation situation; The vibration that touch force produced is a transient process; Touch operation then usually is a continuous process, so after touch force has triggered touch-screen affirmation detecting operation, also need keep this triggering state to guarantee that subsequent operation can be correctly validated.Therefore, a kind of touch objects (including but not limited to finger) detection method that is applied to the infrared touch panel of above-mentioned this structure is also disclosed in the present invention.Accomplish in the touch-screen start-up course, begin to prepare the senses touch thing and after the host computer (computing machine or computer system) that this touch-screen is installed transmits the touch point position data, get into the state of this method of use, include following steps:
Whether signal detection step A., the I/O port that microcontroller is connected with the output terminal of vibration detecting system in the detecting infrared touch panel have the signal of regulation to import;
B. a touch objects position data is exported step; After the I/O port that microcontroller is connected with the output terminal of vibration detecting system in detecting infrared touch panel has the signal input of regulation, through the position data of the output of the COM1 between microcontroller and host computer touch objects;
C. step of judging whether touch objects exists is judged the existence that whether detects touch objects in touch-screen below or several sense cycle;
D. a condition is returned step, and when step C judged that touch objects does not exist, micro controller system turned back to the detecting state of steps A.
In above-mentioned steps, the realization of step B also has two kinds of technical schemes:
First kind; In step B; When detecting after I/O port that said microcontroller is connected with the output terminal of vibration detecting system has the input signal of regulation; Said micro controller system starts the scanning detection procedure, and control infrared transmitting tube and receiving tube detect the position coordinates of display surface touch objects, and the position data of detected touch objects is transferred to host computer.
Second kind, in step B, when detecting after I/O port that said microcontroller is connected with the output terminal of vibration detecting system has the input signal of regulation, said micro controller system log-on data transmission process is transferred to host computer with the position data of touch objects.
Through analyzing above-described technical scheme, can know this scheme advantage such as ripe, with low cost, convenient for installation and maintenance that possesses skills, overcome the defective of prior art, be well suited for being applied in the Infrared touch screen systems.If in detection method, use the standby mode that triggers infrared scanning system work through vibration signal again; In the false triggering interference that filtering such as winged insect, aerial floating thing etc. produce effectively, can also prolong the useful working life of infrared touch panel greatly so.
Description of drawings
Fig. 1 infrared touch panel overall system structure synoptic diagram;
Fig. 2 vibration transducer is at the mounting structure synoptic diagram of cover glass panel edges;
The mounting structure synoptic diagram of Fig. 3 vibration transducer on printed circuit board (PCB);
Fig. 4 uses the structural representation of foil gauge as the vibration transducer of core sensing element;
Fig. 5 uses the structural representation of piezoelectric as the vibration transducer of core sensing element;
The program flow diagram of Fig. 6 touch objects detection method.
Specific embodiments
The present invention can have a plurality of concrete embodiments.
Fig. 1 provides is the general structure synoptic diagram that the infrared touch panel of touch operation is confirmed in the vibration that utilizes touch force to produce.Among the figure, by the glass plate 101 that is used to protect display surface, infrared transmitting tube array 102 and control bus 104 thereof with drive matrix 108, infrared receiving tube array 103 and control bus 105 thereof and include the basic structure that COM1 111 between control gating matrix 109, micro controller system 110, touch-screen and its host computer of signal processing circuit has constituted existing touch-screen.The infrared transmitting tube array is through the receiving tube of emission infrared ray appointment in the infrared receiving tube array; Constitute scanning on the surface of display screen and detect grid 112; Through detecting the infrared ray that power valve that whether receiving tube can receive appointment is launched, judge whether display surface has the position data or the coordinate of touch objects and touch objects.In the present invention; Increased by being installed in the vibration transducer 106 on the touch screen structure assembly, the vibration detecting system that vibration signal processing circuit 107 constitutes; Detect effect and the microvibration that produces that said cover glass surface receives the touch force of touch objects; As existing Infrared touch screen systems senses touch thing the or whether position data of detected touch objects is uploaded to the necessary condition of host computer whether; Be trigger condition, the erroneous detection that so just can filtering causes because of factors such as winged insect, floating things.
Here the construction package of touch-screen mainly is meant each parts of the mechanical mounting structure part of touch-screen; The printed circuit board (PCB) 202 that mainly comprises shell 201, cover glass plate 101, installation infrared components (emission or receiving tube) 203 constitutes, like Fig. 2, shown in Figure 3.
In the embodiment of Fig. 2, vibration transducer 205 is installed in the edge of glass plate 101 through its pedestal, and is connected on the circuit board 202 through extension line 206.The advantage of this structure is that mechanical loss is minimum; Glass plate can be directly delivered on the vibration transducer by the vibration that touch force produces; Can obtain the highest sensitivity; And isolate the false triggering that the vibration that can also reduce to produce because of shell is stressed to greatest extent causes through suitable damping.But this mount scheme also has shortcoming, is exactly the mounting process of vibration transducer is wanted complicated, needs one independent technology.
The embodiment of Fig. 3 has provided a kind of mount scheme of vibration transducer on printed circuit board (PCB).Vibration transducer 205 among the figure directly is welded on the circuit board 202, has simplified mounting process.But be to use favorable mechanical power transmission coupling is arranged between this structural requirement glass plate and the circuit board, the vibration signal of avoiding producing on the glass plate is too much decayed.
Vibration transducer also has the third that embodiment is installed, and just is mounted on the inwall of shell of touch-screen, is used for together with surgery perhaps that touch-screen is installed, other mechanical structured member of protection, like the infrared absorption filter striation etc.The relative merits of this structure require favorable mechanical transmission coupling between shell and the glass plate equally, but receive the interference that is applied to the various impulsive forces on the shell more easily between above-mentioned two kinds.Because this structure is also very simple, so do not provide diagram.
In the present invention, as the core component of vibration detecting system---vibration transducer also has two kinds of main enforcement structures, all can be used for three kinds of above-mentioned mounting structures, like Fig. 4, shown in Figure 5.
Fig. 4 has provided a kind of with the sensor construction of foil gauge as the core component of vibration transducer: foil gauge 403 is installed on the one side or the two sides of semi-girder 402 that the flake structure of balance weight body 404 at one end is installed; The lead-in wire of foil gauge is connected on the binding post 405; Semi-girder is installed on the pedestal 401, has just constituted vibration transducer.Here, the effect of balance weight body is the Oscillation Amplitude that increases semi-girder, the resonance frequency that can also regulate sensor itself simultaneously.
Fig. 5 has provided other a kind of with the sensor construction of piezoelectric element sheet as the core component of vibration transducer: an end of the piezoelectric element 502 of flake structure is installed on the pedestal 501, and the other end is equipped with balance weight body 504.The electrode 503 of piezoelectric element is connected on the binding post 405 in base interior or through the lead-in wire outside the pedestal, has so just constituted vibration transducer.The effect of balance weight body still is to increase Oscillation Amplitude and regulate resonance frequency.Here, piezoelectric element can be selected piezoelectric ceramics or the manufacturing of PFVD piezoelectric membrane for use.
The circuit that is complementary with above-mentioned two kinds of vibration transducers mainly comprises sensor input matching circuit and signal amplification circuit two parts.The effect of match circuit is that output impedance, the connected mode with sensor is complementary.For example, the output impedance of piezoelectric sensor is very high, therefore needs the input impedance of match circuit also very high; Therefore and foil gauge generally all uses the mode place in circuit of electric bridge, usually needs the input of both-end difference, and the face number of seing before is the content of the list of references that provides in 200610011193.6 the one Chinese patent application.As a rule, if appropriate design, input matching circuit also is the part of signal amplification circuit.The effect of signal amplification circuit is the ultra-weak electronic signal that sensor is exported to be amplified to the micro controller system that shields that can be touched discern.Because general foil gauge all can have temperature drift; And different because of mounting means, the component of the gravity of balance weight body also can produce DC component on foil gauge or piezoelectric element, therefore in order to simplify the design of circuit; Preferably using AC amplifier to be used for signal amplifies; Perhaps include AC amplifier at least, be installed in the correct position of amplifying circuit, be unlikely to make the saturated or obstruction of amplifier because of direct current signals that reason was produced such as temperature drifts to guarantee foil gauge.
Though above-mentioned two kinds of structural vibrations sensors can be restrained other interference like neighbourhood noise better; If but neighbourhood noise is very strong; Stronger electromagnetic interference (EMI) is arranged perhaps; Also can therefore can also insert the filtering link in the circuit in case of necessity, to eliminate these interference to greatest extent to vibration transducer generation effect.Because cantilever beam structure has own resonance frequency itself, so the filtering link BPF. that can use the resonance frequency of centre frequency and vibrating sensing element self to be complementary.
The permutation and combination of above-mentioned various piece just can constitute a plurality of specific embodiments of not inventing.
Can know from top description technical scheme basis of the present invention; Touch operation is confirmed in the infrared touch panel utilization detecting slight impact that touch force produced of the present invention; So smaller or comparison constant continuous touch operation for the later touch force of touch impact; Vibration detecting system can't be caught in real time probably and obtained, and therefore specifies at this to be used to detect the method that triggers the continuous touch operation after confirming again.A specific procedure flow process that is used in the touch-screen microcontroller of the present invention is as shown in Figure 6.When touch-screen accomplished start etc. before after the continuous step 601, getting into the step vibration signal interrupts detecting step 602, and whether the electric signal of the I/O port of the appointment of outputing to is arranged through determining step 603 waits or detection and vibration detecting system.At this moment touch-screen can have duty:
First kind; Micro controller system directly gets into the process that the scanning of touch objects position detects through setting up procedure 601 backs; Control infrared transmitting tube and receiving tube detect the position data of display surface touch objects; But be not transferred to host computer with these and with the position data of detected touch objects; After the electric signal that has detected vibration detecting system output, micro controller system is log-on data transmitting step 604, and detected touch objects position data is transferred to host computer through the COM1 between itself and the host computer.This mode is to begin to detect the vibration trigger pip that is caused by touch force again after the infrared scanning system in touch-screen has been worked, and therefore has corresponding speed advantage faster.
Second kind; Micro controller system gets into holding state through setting up procedure 601 backs; Up to detecting after I/O port that said microcontroller is connected with the output terminal of vibration detecting system has the input signal of regulation, micro controller system just begins to start the scanning detection procedure of touch objects, the position data of control infrared transmitting tube and receiving tube scanning detection display surface touch objects; The log-on data transmitting step 604 then, and the position data of detected touch objects is transferred to host computer.This duty is equivalent to when not detecting the above-mentioned vibration trigger pip that is caused by touch force, and the infrared scanning system of touch-screen is not launched infrared ray, therefore power valve aging late, the mission life that can prolong infrared touch panel greatly.
Here; Why the I/O port is used " detecting " rather than " detection " this speech; Be because in micro controller system, there are some ports not need the microcontroller operation just can detect external signal; Be a kind of passive response mode, have some ports then must could detect and obtain external signal, belong to active response through the active operation of microcontroller.This dual mode can use in the present invention, and " detecting " more fully comprises these two kinds operations or response mode with respect to " detection ".
After confirming and having transmitted first the touch objects position data, micro controller system continues the touch objects position data and detects step 605, and inserts and touch continuity determining step 606, whether detect subsequently once or several times detect whether can also detect touch objects.Because the time that the scanning of infrared touch panel full screen detects once is very short; If so can in scanning sense cycle subsequently, detect touch objects; Can think that then this is the continuity of touch operation for the first time, therefore continue output touch objects position data to host computer.If detection subsequently detects less than touch objects; Think that then current touch operation finishes; Then process turns back to vibration signal and interrupts detecting step 602, and whether the electric signal of the I/O port of the appointment of outputing to is arranged through determining step 603 waits or detection and vibration detecting system once more.Because there is certain friction force on cover glass plate surface; So the operator makes touch objects or finger produce slight beating when touch operation possibly because of the obstruction of friction force; The scanning sensing range that perhaps reason makes the of short duration disengaging of touch objects determined in the setting height(from bottom) of display surface by infrared transmitting tube and receiving tube because translational speed is very fast etc.; Therefore preferably be set in several the later sense cycle of scanning sense cycle that detect touch objects for the last time and be not only one-period with interior detection less than touch objects; Judge that just current touch operation finishes, just turn back to detecting step 602.Can keep the continuity of operating so better, and can not produce false triggering basically because of the influence of winged insect, floating thing etc.
Stressed realization the object of the invention basic technical scheme above, but be not whole embodiment and application modes.Such as the infrared emission that provides in embodiment and the accompanying drawing and receiving tube array is a kind of structure to pipe that transmits and receives one to one commonly used; The quantity of infrared transmitting tube and receiving tube equates; And in fact the quantity of infrared emission and receiving tube of some infrared touch panels and unequal arranged, but still can use technical scheme of the present invention.Simultaneously; As complete products scheme; Also need cooperate other slave part; Like the selection of concrete structure, foil gauge or the piezoelectric of microcontroller program, the CONSTRUCTED SPECIFICATION of vibration transducer etc., therefore the design of modes such as the improvement on the basis of the given various basic technical schemes of the present invention, transplanting, accommodation all belongs within the technical scope of the present invention.
Claims (7)
1. infrared touch panel that utilizes touch force to trigger; Include by frame, the construction package that is installed in the circuit board in the frame and is used to protect the glass plate of display to constitute; And arrange some infrared emission and the infrared receiving tube of installing along the rectangle opposite side of said frame; And be used to drive said infrared transmitting tube and be used to handle photosignal that infrared receiving tube exports and the micro controller system of exporting testing result, it is characterized in that:
In the inside of described infrared touch panel, also include a cover by the vibrating sensing element that is installed on the said construction package, and the mechanical vibration detection system that signal processing circuit constituted that is complementary with said vibrating sensing element; The signal output part of this system is connected with an I/O port of described micro controller system;
Vibration detecting element in the described mechanical vibration detection system, be by one one end be installed in one on the pedestal semi-girder, be installed in semi-girder surface foil gauge, be installed in the vibration detection assembly that balance weight body constituted of the semi-girder other end;
Vibration detecting element in the perhaps described mechanical vibration detection system is the vibration detection assembly that balance weight body constituted of the other end that is installed in the semi-girder that is made up of piezoelectric on the pedestal and is installed in said piezoelectric semi-girder by a slice one end.
2. the infrared touch panel that utilizes touch force to trigger according to claim 1 is characterized in that: described vibration detecting element is installed on the surface of this thrin of circuit board in the inner or frame of edge, the frame of the cover glass plate in the said construction package through pedestal.
3. the infrared touch panel that utilizes touch force to trigger according to claim 1 is characterized in that: include AC amplifier in the employed amplifier in the signal processing circuit that said and vibrating sensing element is complementary.
4. the infrared touch panel that utilizes touch force to trigger according to claim 1; It is characterized in that: in the signal processing circuit that said and vibrating sensing element are complementary, also include the BPF. that the resonance frequency of a centre frequency and vibrating sensing element self is complementary.
5. method of utilizing touch force to trigger infrared touch panel senses touch thing, this method is used to include the infrared touch panel of vibration detecting system, includes vibration detecting element in the said vibration detecting system, and this method comprises the steps:
Whether signal detection step A., the I/O port that microcontroller is connected with the output terminal of vibration detecting system in the detecting infrared touch panel have the signal of regulation to import;
B. a touch objects position data is exported step; After the I/O port that microcontroller is connected with the output terminal of vibration detecting system in detecting infrared touch panel has the signal input of regulation, through the position data of the output of the COM1 between microcontroller and host computer touch objects;
C. step of judging whether touch objects exists is judged the existence that whether detects touch objects in touch-screen below or several sense cycle;
D. a condition is returned step, and when step C judged that touch objects does not exist, micro controller system turned back to the detecting state of steps A;
Vibration detecting element in the wherein said vibration detecting system, be by one one end be installed in one on the pedestal semi-girder, be installed in semi-girder surface foil gauge, be installed in the vibration detection assembly that balance weight body constituted of the semi-girder other end;
Vibration detecting element in the perhaps described vibration detecting system is the vibration detection assembly that balance weight body constituted of the other end that is installed in the semi-girder that is made up of piezoelectric on the pedestal and is installed in said piezoelectric semi-girder by a slice one end.
6. according to claim 5 described methods; It is characterized in that: in step B; When detecting after I/O port that said microcontroller is connected with the output terminal of vibration detecting system has the input signal of regulation; Said micro controller system starts touch objects scanning detection procedure, and control infrared transmitting tube and receiving tube detect the position data of display surface touch objects, and the position data of detected touch objects is transferred to host computer.
7. according to claim 5 described methods; It is characterized in that: in step B; When detecting after I/O port that said microcontroller is connected with the output terminal of vibration detecting system has the input signal of regulation; Said micro controller system log-on data transmission process is transferred to host computer with the position data of touch objects.
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| CN2006101653759A CN101206548B (en) | 2006-12-19 | 2006-12-19 | Infrared touch panel triggered using touch force and detecting method thereof |
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| CN2006101653759A CN101206548B (en) | 2006-12-19 | 2006-12-19 | Infrared touch panel triggered using touch force and detecting method thereof |
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| US8130202B2 (en) | 2007-05-01 | 2012-03-06 | International Business Machines Corporation | Infrared touch screen gated by touch force |
| CN102741791B (en) * | 2010-02-17 | 2016-01-13 | 三菱电机株式会社 | Touch panel device |
| CN102722238B (en) * | 2012-04-20 | 2016-04-27 | 深圳市汇顶科技股份有限公司 | A kind of method and system of touch terminal recognition and verification type touch gestures |
| CN103019472B (en) * | 2012-11-30 | 2016-06-15 | 深圳市深越光电技术有限公司 | Infrared touch screen |
| JP5954604B1 (en) * | 2015-12-14 | 2016-07-20 | 富士ゼロックス株式会社 | Diagnostic device, diagnostic system and program |
| CN107797710A (en) * | 2017-11-21 | 2018-03-13 | 四川长虹教育科技有限公司 | A kind of Infrared touch screen systems |
| CN109508112B (en) * | 2018-11-23 | 2022-06-17 | 京东方科技集团股份有限公司 | Touch module, working method thereof and display device |
| CN109828669B (en) * | 2019-01-31 | 2021-12-31 | 华为技术有限公司 | Touch signal processing method and electronic equipment |
| CN112445329A (en) * | 2019-08-28 | 2021-03-05 | 南昌欧菲生物识别技术有限公司 | Touch feedback module and touch device |
| CN116420131A (en) * | 2021-06-08 | 2023-07-11 | 广州创知科技有限公司 | Touch data processing method and interactive panel |
| CN113359959B (en) * | 2021-06-11 | 2022-11-08 | 深圳泰尔智能视控股份有限公司 | Infrared touch all-in-one of explosion-proof anticollision |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2363316Y (en) * | 1998-12-15 | 2000-02-09 | 刘中华 | touch force action point position coordinate detection sensing device |
| CN1335548A (en) * | 2000-07-24 | 2002-02-13 | 北京汇冠科技有限公司 | Infrared touch screen performance improving structure and method |
| CN1864125A (en) * | 2003-10-10 | 2006-11-15 | 3M创新有限公司 | Wake-on-touch for vibration sensing touch input devices |
-
2006
- 2006-12-19 CN CN2006101653759A patent/CN101206548B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2363316Y (en) * | 1998-12-15 | 2000-02-09 | 刘中华 | touch force action point position coordinate detection sensing device |
| CN1335548A (en) * | 2000-07-24 | 2002-02-13 | 北京汇冠科技有限公司 | Infrared touch screen performance improving structure and method |
| CN1864125A (en) * | 2003-10-10 | 2006-11-15 | 3M创新有限公司 | Wake-on-touch for vibration sensing touch input devices |
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| CN101206548A (en) | 2008-06-25 |
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