EP2102735A1 - Vorrichtung zum erfassen der ortskoordinaten eines druckpunktes innerhalb eines sensorfeldes - Google Patents
Vorrichtung zum erfassen der ortskoordinaten eines druckpunktes innerhalb eines sensorfeldesInfo
- Publication number
- EP2102735A1 EP2102735A1 EP07855362A EP07855362A EP2102735A1 EP 2102735 A1 EP2102735 A1 EP 2102735A1 EP 07855362 A EP07855362 A EP 07855362A EP 07855362 A EP07855362 A EP 07855362A EP 2102735 A1 EP2102735 A1 EP 2102735A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- pressure point
- resistance layer
- detecting
- location coordinates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
Definitions
- the invention relates to a device for detecting the location coordinates of a pressure point within a sensor field, which has at least one electrical resistance layer which is connected via edge-side electrical connections to a measuring and evaluation circuit.
- Devices for detecting a pressure point within a given sensor field are used for different applications, for example in the form of touchscreens.
- Resistive touchscreens exploit the fact that in the case of an electrical resistance layer to which a DC electrical voltage is applied on two opposite edges, the voltage tapped at a point between the two edges depends on the distance of the tapping point from the edges applied to the voltage. If, therefore, an electrical contact is produced by a pressure-induced deflection of the resistance layer via a layer arranged at a short distance from the resistance layer, the voltage prevailing in the pressure point can be used as a measure of the distance of the pressure point from the edges applied to the voltage via this electrical contact the resistance layer are evaluated.
- the resistance layer applied to the DC voltage forms a voltage divider with the electrical contact in the region of the pressure point.
- the invention is therefore based on the object, a device for detecting the location coordinates of a pressure point within a sensor field in such a way that on the one hand a comparatively simple structure can be ensured and on the other hand, independence from external voltage sources is achieved.
- the invention solves the problem set by the fact that provided with at least three electrical connections electrical resistance layer is applied to a ferroic layer of an internally charged cellular polymer.
- the invention is based on the idea to provide the required for the location of the pressure point within the sensor field electrical charge by piezoelectric effects when the sensor field is locally exposed to a compressive load, so that the resulting charge along the resistance layer can be derived.
- Electrical connections can be used to measure the resulting current, which depends on the electrical resistance. stood the resistance layer between the charge source corresponding pressure point and the respective electrical connection and thus depends on the distance of the pressure point of the respective terminal. To compensate for the dependence of the generated charge and thus the current of the applied pressure, at least three electrical connections must be provided.
- the piezoelectric effects required for the provision of corresponding charges are advantageously made possible by a ferroic layer, ie a material whose symmetry can be changed by temperature or pressure, as is exploited in the case of ferroelectric and / or ferromagnetic components.
- Flexible layers with quasiferroelectric properties are formed when cellular polymers are permanently internally charged by microplasma discharges. Foamed, non-polar polymers, which are excellent insulators, are particularly suitable for such charging.
- Prerequisite for an internal charge is an ionization of the gas in the cell-like cavities, so that free charge carriers in the form of electrons and ions are present.
- the electrical resistance layer is applied to the ferroic layer, the charge resulting from a pressure load on the ferro-layer is dissipated via the resistance layer to the terminals, whereby an unambiguous location determination is obtained via the ratio of the measured discharge currents - A -
- the pressure point via a connected measuring and evaluation circuit is possible. If more than required for the unambiguous position determination connections of the resistive layer, so also several pressure points can be detected, which is important for some applications.
- ferroic layer is arranged in a capacitive structure between two cover layers, one of which forms the electrical resistance layer and the other an electrically conductive layer, so that between the cover layers when a charge occurs unique voltage ratios result.
- Ferroic layers of an internally charged cellular polymer are not translucent. However, this plays no role in connection with display fields to be provided if the ferroic layer provided with the electrical resistance layer forms a support for the display field, which-as known per se-can have light-emitting, organic diodes. It is only necessary to ensure that a sufficient pressure load of the ferroic layer is ensured by the applied display panel. Due to the flexural softness of the ferroic layer, bending deformation of the ferroic layer provided with the display panel can be ensured. It is only necessary to ensure a corresponding bending softness of the display panel.
- Fig. 1 shows an inventive device for detecting the location coordinates of a pressure point within a sensor field in a schematic cross-section
- Fig. 2 shows this device in a schematic plan view. Way to carry out the invention
- the illustrated device for detecting the location coordinates of a pressure point has a ferroic layer 1 of an internally charged cellular polymer between two cover layers, one of which forms an electrical resistance layer 2, while the other constitutes an electrically conductive layer 3.
- the electrical resistance layer 2 is provided with edge-side electrical terminals 4, via which the device is connected to a measuring and evaluation circuit 5, which includes separately shown current measuring devices 6 in the region of each terminal 4. If the ferroic layer 1 is locally subjected to a pressure, as illustrated in FIG.
- the resistance layer 2 between the pressure point 8 and the terminals 4 ohmic resistors Ri, R 2 , R 3 and R 4 represents the size of the derived via the terminals 4 discharge currents Co-determine so that it can be concluded with the size ratio of the measured currents to the resistance ratios and thus to the distance of the pressure point 8 of the terminals 4.
- the location coordinates of the pressure point 8 can thus be made available without the need for an external voltage source.
- the ferroic layer 1 of a cellular polymer is bendable, so that the sensor field determined by the resistive layer 2 for detecting the position coordinates of a pressure point 8 can be subjected to bending deformation. This bend Deformation does not adversely affect the measurement result because of the low piezoelectric coefficient d 3 i.
- the ferroic layer 1 with the resistive layer 2 must serve as a support for such a display panel, because the ferroic layer 1 is opaque to a cellular polymer.
- such an additional display panel is indicated by dash-dotted lines and provided with the reference numeral 10.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Position Input By Displaying (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0209006A AT504438B8 (de) | 2006-12-19 | 2006-12-19 | Vorrichtung zum erfassen der ortskoordinaten eines druckpunktes innerhalb eines sensorfeldes |
PCT/AT2007/000576 WO2008074046A1 (de) | 2006-12-19 | 2007-12-19 | Vorrichtung zum erfassen der ortskoordinaten eines druckpunktes innerhalb eines sensorfeldes |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2102735A1 true EP2102735A1 (de) | 2009-09-23 |
Family
ID=39092768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07855362A Ceased EP2102735A1 (de) | 2006-12-19 | 2007-12-19 | Vorrichtung zum erfassen der ortskoordinaten eines druckpunktes innerhalb eines sensorfeldes |
Country Status (4)
Country | Link |
---|---|
US (1) | US9189120B2 (de) |
EP (1) | EP2102735A1 (de) |
AT (1) | AT504438B8 (de) |
WO (1) | WO2008074046A1 (de) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6323580B1 (en) * | 1999-04-28 | 2001-11-27 | The Charles Stark Draper Laboratory, Inc. | Ferroic transducer |
US7253807B2 (en) * | 2002-09-25 | 2007-08-07 | Uievolution, Inc. | Interactive apparatuses with tactiley enhanced visual imaging capability and related methods |
AU2003266663A1 (en) * | 2002-10-01 | 2004-04-23 | National Institute Of Advanced Industrial Science And Technology | Piezoelectric sensor and input device comprising same |
ATE329361T1 (de) * | 2002-12-09 | 2006-06-15 | Koninkl Philips Electronics Nv | Transparentes, berührungsempfindliches umschaltsystem |
US20040263483A1 (en) * | 2003-06-24 | 2004-12-30 | Aufderheide Brian E | Sensing device |
JP4635421B2 (ja) * | 2003-09-02 | 2011-02-23 | Tdk株式会社 | 転写用導電性フィルム、及びそれを用いた透明導電膜の形成方法 |
US7205028B2 (en) * | 2003-12-24 | 2007-04-17 | Tdk Corporation | Method for producing functional film |
WO2006043660A1 (ja) * | 2004-10-22 | 2006-04-27 | Sharp Kabushiki Kaisha | タッチセンサ付き表示装置およびその駆動方法 |
US7324095B2 (en) * | 2004-11-01 | 2008-01-29 | Hewlett-Packard Development Company, L.P. | Pressure-sensitive input device for data processing systems |
AT503306B1 (de) * | 2006-01-26 | 2007-09-15 | Univ Linz | Ferroisches bauelement |
-
2006
- 2006-12-19 AT AT0209006A patent/AT504438B8/de not_active IP Right Cessation
-
2007
- 2007-12-19 US US12/448,398 patent/US9189120B2/en not_active Expired - Fee Related
- 2007-12-19 WO PCT/AT2007/000576 patent/WO2008074046A1/de active Application Filing
- 2007-12-19 EP EP07855362A patent/EP2102735A1/de not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO2008074046A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008074046A1 (de) | 2008-06-26 |
US20100103122A1 (en) | 2010-04-29 |
AT504438B8 (de) | 2008-09-15 |
AT504438B1 (de) | 2008-05-15 |
US9189120B2 (en) | 2015-11-17 |
AT504438A4 (de) | 2008-05-15 |
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Legal Events
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Inventor name: SCHWOEDIAUER, REINHARD Inventor name: BAUER, SIEGFRIED |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20101209 |
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Ref country code: DE Ref legal event code: R003 |
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Effective date: 20151124 |