CN203232405U - Capacitive touch screen applied to large-size human-machine interaction equipment - Google Patents
Capacitive touch screen applied to large-size human-machine interaction equipment Download PDFInfo
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- CN203232405U CN203232405U CN 201320214848 CN201320214848U CN203232405U CN 203232405 U CN203232405 U CN 203232405U CN 201320214848 CN201320214848 CN 201320214848 CN 201320214848 U CN201320214848 U CN 201320214848U CN 203232405 U CN203232405 U CN 203232405U
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Abstract
The utility model relates to a capacitive touch screen applied to large-size human-machine interaction equipment. The capacitive touch screen comprises a touch sensing unit, a touch screen controller and a mainboard control unit, the touch sensing unit is made of glass with a transparent conducting layer on a single face, four electrodes connected with the transparent conducting layer are arranged at four corners where four edges of the glass screen are intersected and connected to the touch screen controller, the interrupt signal output end of the touch screen controller is connected to the interrupt signal input end of the mainboard control unit, and other signal output ends of the touch screen controller are connected to other signal input ends of the mainboard control unit. Compared with projective capacitor screens, the capacitive touch screen has the advantages that the manufacturing process is relatively simple, the compositional structure is simplified, and only the single transparent conducting layer is needed for realization, so that the outermost protecting-layer glass is not needed, thickness is reduced, cost is lowered, functional needs of touch screens in size of ATMs (automatic teller machines) and the like can be met.
Description
Technical field
The utility model proposes surface capacitance type touch screen, it can be widely used in belonging to the capacitive touch screen technical field on large-sized human-computer interaction device.
Background technology
Man-machine interface claims user interface or user interface again, is media and the dialog interface of transmission, exchange message between people and the computing machine, is the important component part of computer system.Be the media that system and user carry out mutual and message exchange, it realizes internal form and the human conversion that can accept between the form of information.China is the market that global man-machine interface has the call, and at present, domestic man-machine interface manufacturer overall performance presents the state of quick growth.
Touch-screen is a kind of positioning equipment, the user can be directly with hand to computing machine input coordinate information, the same with mouse, keyboard, also be a kind of input equipment.At present, touch screen technology is as a kind of novel man-machine interaction input mode, have sturdy and durable, reaction velocity fast, save the space, be easy to many advantages such as interchange.Surface capacitance type touch screen is a kind of as capacitive touch screen, its sensitivity is very high, as long as gently can be by system identification once touching, the while capacitive touch screen be prevented swiping, anti-riot ability is strong, be not afraid of dust, water and dirt influence, be adapted at using under the rugged surroundings.
At present, be applied in the touch-screen on the large scale human-computer interaction device, as ATM, large-scale industrial control equipment etc., the size of its touch-screen is generally all about 14 inches.On this kind equipment, traditional method is to adopt infrared touch panel and surface acoustic wave touch screen, uses the manufacturer of capacitive touch screen also seldom.
Though infrared ray touches and is not subjected to voltage, electric current and electrostatic interference, infrared touch panel feels bad when the sphere display uses, and the resolution that screen can be realized is also lower, is subjected to the interference of high light simultaneously easily, requires in indoor use.Surface acoustic wave touch screen is that the characteristics design of utilizing sound wave to propagate on the rigid body surface forms, it has the resolution height, response speed is fast, the advantage that long service life and cost are low, but as speckling with dust on the touch-screen, to bring influence to the use of touch-screen, do not support simultaneously the waterproof operation yet, need be in indoor use.
And the surface capacitance type touch belongs to a kind of of capacitive touch screen, possesses all advantages of capacitive touch screen, and projecting type capacitor shields relatively simultaneously, though can only realize single-point touches, but simple relatively on manufacture craft, easily realize, can satisfy large scale human-computer interaction device's touch requirement.
Summary of the invention
This case technical matters to be solved: the utility model provides is applied to capacitive touch screen on the large scale human-computer interaction device, not only on structural thickness and cost of manufacture, infrared ray and surface acoustic wave touch screen decrease relatively, can remedy simultaneously the shortcoming of this two classes touch-screen, on function, also can realize the requirement of single-point touch.
Technical scheme
The technical scheme that the utility model proposes based on above technical matters is: the capacitive touch screen that is applied on the large scale human-computer interaction device comprises touch sensing unit, touch screen controller and mainboard control module, described touch sensing unit adopts the glass of one-side band ITO, and there are 4 electrodes that link to each other with transparency conducting layer at 4 angles of intersecting at 4 edges of glass screen; 4 electrodes are connected to touch screen controller, and the look-at-me output terminal of touch screen controller is connected to mainboard control module look-at-me input end.Other signal output part of touch screen controller is connected to other signal input part of mainboard control module.
Technique effect
The surface capacitance type touch screen that the utility model provides, the projecting type capacitor screen is simple relatively on production process relatively, also is simplified on the composition structure simultaneously, only needs the single-layer and transparent conductive layer just can realize.So just do not need that layer protective seam glass of outermost, reduced thickness, on cost, obtained reduction yet, but on function, can satisfy the requirement of ATM equidimension touch screen functionality; In addition, surface capacitance type touch screen has remedied the shortcoming of infrared ray and surface acoustic wave touch screen, also supports the operate as normal of indoor and outdoors, also can normally use in rugged environment.
Description of drawings
Fig. 1 is that the utility model is applied to the capacitive touch screen electrical block diagram on the large scale human-computer interaction device;
Fig. 2 is glass screen and the LED physical construction synoptic diagram that the utility model is applied to the capacitive touch screen on the large scale human-computer interaction device;
Fig. 3 is the profile synoptic diagram in the peripheral disposition linearization electrode of touch sensitive area;
Fig. 4 is the touch sensing unit equivalent circuit structure synoptic diagram that the utility model is applied to the capacitive touch screen on the large scale human-computer interaction device;
Fig. 5 is the touch screen controller circuit block diagram that the utility model is applied to the capacitive touch screen on the large scale human-computer interaction device.
Embodiment
As shown in Figure 1, the capacitive touch screen that is applied on the large scale human-computer interaction device comprises touch sensing unit, touch screen controller and mainboard control module, described touch sensing unit comprises glass screen, as shown in Figure 2, lower surface at described glass screen 1 scribbles transparency conducting layer 2, described transparency conducting layer is ITO (Indium Tin Oxide, tin indium oxide) layer or nano-silver layer or graphene layer.In the present embodiment, its touch sensing unit adopts the ITO layer as workplace, at the lower surface of described ITO layer very little clearance 3 is arranged, and is fitted with LCD 4(LED at its lower surface).There are 4 electrodes that link to each other with transparency conducting layer at 4 angles of intersecting at 4 edges of glass screen; As directly with four edge electrodes by drawing with the lift-launch of metallics such as silver slurry, then the electric field of Chan Shenging is highly nonlinearized.And the utility model, not directly four electrodes to be drawn, but employing is the linearizing electrode of electric field, at the peripheral disposition one-tenth electrode as shown in Figure 3 of electrically conducting transparent layer region (touch sensitive area), described electrode is the electric field linearization electrode that is printed with silver slurry pattern that is centered around the transparency conducting layer outer peripheral areas.4 electrodes are drawn the back by the argent slurry and are bound with flexible PCB, and described flexible PCB is connected to touch screen controller; Namely 4 electrodes are connected to touch screen controller, finish the communication of touch sensing unit and touch screen controller.The output terminal of touch screen controller links to each other with the mainboard control module through flexible PCB again.By the communication modes realization of IIC and the communication of mainboard control module.The look-at-me output terminal of touch screen controller is connected to mainboard control module look-at-me input end.Other signal output part of touch screen controller is connected to other signal input part of mainboard control module.As shown in Figure 5, described touch screen controller comprises A.C.-D.C. converter, analog filter, amplifier, analog to digital converter (A/D converter) and the firmware of series connection successively.
Capacitive touch screen of the present utility model, it realizes that principle of work is as follows: it is signal-powered that each electrode of capacitive touch screen adopts vibration to drive, it drives general high-frequency sine or the square-wave signal of adopting of signal, when the human body touch screen, capacitive coupling between transparency conducting layer and the finger will produce a little electric current, on each bar line of these current direction four linea angulatas, by AC-DC converter the oscillating current on each bar line of four linea angulatas is converted to direct current signal then.Again through an analog filter, most of environmental noise is got rid of subsequently, only kept rms signal (the root-mean-square value signal claims the effective value signal again), obtain stable measuring-signal.This signal passes to the gain amplifier stage then, adopts various automatic gain methods to go to control and amplifies this small measured signal.This high-quality signal after amplifying is converted to digital signal through A/D converter again.In case signal passes through A/D converter, firmware judges that further touch signal is whether in the effective coverage, judge namely whether touch signal surpasses the bound of effective coverage, if exceed bound, judge that then this signal is for disturbing, touch-screen is done this undesired signal and is not responded processing, if in the effective coverage, judge that namely touch signal is in the bound of effective coverage, use the coordinate setting principle to handle the position of touch that provides finger by software, send look-at-me simultaneously, this coordinate signal is passed to the mainboard control module, the mainboard control module is handled this signal by interruption.
As shown in Figure 3, what adopt is the linearizing electrode of electric field, form partly is transparency conducting layer in the middle of removing, peripheral area shading partly is the transparency conducting layer (with the same material of form) of material such as ITO, peripheral non-hatched area is that the silver slurry waits metal material, it is top that the silver slurry waits metal material to be imprinted on by printing, by this 4 electrodes is added to touch sensing unit.Its work reason is as follows: when touch-screen work, by timesharing two pairs of electrodes are supplied with opposite high frequency voltage sources, (as Fig. 4, electrode 1 and electrode 3 electrode that partners, electrode 2 and electrode 4 compositions another to electrode).When finger touch arrives the upper surface of touch-screen, the coupling condenser of the workplace of human body and touch-screen formation at this moment is equivalent to conductor, finger is inhaled in the touch point and is removed a part of electric charge like this, namely is a small electric current, and this electric current is exported from four electrodes of touch-screen respectively.Position with electrode 1 place is the true origin position, and its coordinate setting principle is as follows:
X=L1*(I2+I3)/(I1+I2+I3+I4)；
Y=L2*(I3+I4)/(I1+I2+I3+I4)；
I1, I2, I3, I4 are respectively the electric current of the lead-in wire output at four angles; L1, L2 are the size of the transparency conducting layer of surface capacitance type touch screen.
Claims (5)
1. the capacitive touch screen that is applied on the large scale human-computer interaction device comprises touch sensing unit, touch screen controller and mainboard control module, it is characterized in that: described touch sensing unit adopts the glass of one-side band transparency conducting layer, and there are 4 electrodes that link to each other with transparency conducting layer at 4 angles of intersecting at 4 edges of glass screen; 4 electrodes are connected to touch screen controller, and the look-at-me output terminal of touch screen controller is connected to mainboard control module look-at-me input end, and other signal output part of touch screen controller is connected to other signal input part of mainboard control module.
2. the capacitive touch screen that is applied on the large scale human-computer interaction device as claimed in claim 1 is characterized in that: described transparency conducting layer is tin indium oxide (ITO) layer, nano-silver layer or graphene layer.
3. the capacitive touch screen that is applied on the large scale human-computer interaction device as claimed in claim 1 or 2, it is characterized in that: described 4 electrodes are drawn by silver slurry conductive layer again and are connected to touch screen controller with the flexible PCB binding, and described mainboard control module is connected to touch screen controller by flexible PCB.
4. the capacitive touch screen that is applied on the large scale human-computer interaction device as claimed in claim 1 or 2 is characterized in that: described electrode is the electric field linearization electrode that is printed with silver slurry pattern that is centered around the transparency conducting layer outer peripheral areas.
5. the capacitive touch screen that is applied on the large scale human-computer interaction device as claimed in claim 1 or 2 is characterized in that: described touch screen controller comprises A.C.-D.C. converter, analog filter, amplifier, analog to digital converter and the firmware that links to each other successively; 4 electrodes of capacitive touch screen are connected to oscillation drive circuit respectively, described AC-DC converter is converted to direct current signal with the oscillating current of 4 electrodes, described analog filter filtering environmental noise, and reservation root-mean-square value signal, amplifier is automatic gain amplifier, analog to digital converter is digital signal with analog signal conversion, and firmware comprises the touch key-press judgment means, is used for having judged whether that touch signal presses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320214848 CN203232405U (en) | 2013-04-25 | 2013-04-25 | Capacitive touch screen applied to large-size human-machine interaction equipment |
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| CN 201320214848 CN203232405U (en) | 2013-04-25 | 2013-04-25 | Capacitive touch screen applied to large-size human-machine interaction equipment |
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| CN203232405U true CN203232405U (en) | 2013-10-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090682A (en) * | 2014-07-29 | 2014-10-08 | Tcl通讯（宁波）有限公司 | Touch system of touch screen and implementing method thereof |
| CN104166478A (en) * | 2014-08-12 | 2014-11-26 | Tcl通讯（宁波）有限公司 | Touch positioning method and device of touch screen |
| CN108108074A (en) * | 2018-01-26 | 2018-06-01 | 江西合力泰科技有限公司 | A kind of large scale self-capacitance touch-control film and its application |
| CN109240546A (en) * | 2018-11-08 | 2019-01-18 | 苏州芯沃科电子科技有限公司 | A kind of capacitive touch screen device with voice control function |
| CN110515504A (en) * | 2019-08-13 | 2019-11-29 | 芜湖长信科技股份有限公司 | A kind of touch feedback touch screen |
| CN113589970A (en) * | 2021-08-02 | 2021-11-02 | 广西中沛光电科技有限公司 | Design method of large-size capacitive touch screen system |
-
2013
- 2013-04-25 CN CN 201320214848 patent/CN203232405U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090682A (en) * | 2014-07-29 | 2014-10-08 | Tcl通讯（宁波）有限公司 | Touch system of touch screen and implementing method thereof |
| CN104090682B (en) * | 2014-07-29 | 2017-06-06 | Tcl通讯（宁波）有限公司 | The touch-control system and its implementation of a kind of touch-screen |
| CN104166478A (en) * | 2014-08-12 | 2014-11-26 | Tcl通讯（宁波）有限公司 | Touch positioning method and device of touch screen |
| CN108108074A (en) * | 2018-01-26 | 2018-06-01 | 江西合力泰科技有限公司 | A kind of large scale self-capacitance touch-control film and its application |
| CN109240546A (en) * | 2018-11-08 | 2019-01-18 | 苏州芯沃科电子科技有限公司 | A kind of capacitive touch screen device with voice control function |
| CN110515504A (en) * | 2019-08-13 | 2019-11-29 | 芜湖长信科技股份有限公司 | A kind of touch feedback touch screen |
| CN113589970A (en) * | 2021-08-02 | 2021-11-02 | 广西中沛光电科技有限公司 | Design method of large-size capacitive touch screen system |
| CN113589970B (en) * | 2021-08-02 | 2024-04-02 | 广西中沛光电科技有限公司 | Design method of large-size capacitive touch screen system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151008 Address after: 210000 No. 189 Yan Hu Road, Jiangning Economic Development Zone, Jiangsu, Nanjing, China Patentee after: Nanjing Dianmian Photoelectricity Co., Ltd. Address before: 210000 No. 189 Yan Hu Road, Jiangning Development Zone, Jiangsu, Nanjing, China Patentee before: Pan Xingxiu |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151231 Address after: 210000 Jiangsu city in Nanjing Province Economic Development Zone Jiangning Road No. 9 building A2 week Patentee after: NANJING DOTS INTELLIGENT TECHNOLOGY CO., LTD. Address before: 210000 No. 189 Yan Hu Road, Jiangning Economic Development Zone, Jiangsu, Nanjing, China Patentee before: Nanjing Dianmian Photoelectricity Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20190425 |