EP2235616A1 - Circuit électronique d'analyse a alternance axe d'alimentation/axe de détection pour capteur tactile multicontactsà matrice passive - Google Patents
Circuit électronique d'analyse a alternance axe d'alimentation/axe de détection pour capteur tactile multicontactsà matrice passiveInfo
- Publication number
- EP2235616A1 EP2235616A1 EP08873296A EP08873296A EP2235616A1 EP 2235616 A1 EP2235616 A1 EP 2235616A1 EP 08873296 A EP08873296 A EP 08873296A EP 08873296 A EP08873296 A EP 08873296A EP 2235616 A1 EP2235616 A1 EP 2235616A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axis
- matrix
- detection
- analysis circuit
- supply
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
-
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
-
- 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
- G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires
Definitions
- the present invention relates to an electronic analysis circuit alternating feed axis / detection axis for multicontact touch sensor passive matrix.
- the present invention relates to the field of passive multicontact transparent transducers with a passive matrix.
- This type of sensor is provided with means for simultaneous acquisition of the position, the pressure, the size, the shape and the displacement of several fingers on its surface, in order to control an equipment, preferably via an interface graphic.
- Said sensors can be used, in a non-limiting manner, as interfaces for personal computers, portable or not, cell phones, ATMs (banks, points of sale, ticketing), game consoles, multimedia players portable devices (digital walkmans), control of audiovisual equipment or appliances, control of industrial equipment, GPS navigators.
- multicontact transparent tactile sensors are known.
- Such a sensor is constituted by a tactile interaction surface having two non-parallel networks.
- Each network consists of a set of generally parallel tracks. These networks define between they are nodes located at the projection of the intersection of one network on the other. At these nodes are provided physical measuring means delivering information depending on the presence on the corresponding contact area.
- These sensors make it possible to know the state of several contact zones simultaneously.
- the measurement performed on each node corresponds to a measurement of voltage or capacitance at the terminals of the two network elements associated with the considered node.
- Each network is scanned sequentially and rapidly to recreate an image of the sensor several times per second. In order to ensure a proper response time, it is imperative to be able to measure the activity of a finger with a maximum latency of 20 milliseconds.
- Said device further comprises an electronic analysis circuit for acquiring and analyzing the data of the sensor with a sampling frequency of 100 Hz.
- the sensor can be divided into several zones in order to perform a parallel processing on said areas. It comprises a matrix of conductive tracks, said matrix comprising supply means on one of the two axes, and means for detecting electrical characteristics on the other axis, at intersections between the two axes.
- the disadvantage of this solution is that the data measured and processed by said electronic analysis circuit are likely to suffer from parasitic phenomena as well as problems related to the resistivity of materials, especially in the case of transparent conductive materials in ITO (indium-tin oxide) deposit. Said measured and processed data then significantly impact the accuracy and sensitivity of the touch sensor implemented.
- the object of the present invention is to overcome this drawback, by providing an electronic analysis circuit configured to detect and avoid possible artifacts.
- the present invention proposes an electronic circuit for analyzing a multicontact passive matrix touch sensor comprising means for supplying electrical power to one of the two axes of the matrix, and means for detecting electrical characteristics according to the other axis of the matrix at the intersections between the two axes, characterized in that the supply axis and the detection axis are alternated.
- the measured electrical characteristic is the resistance
- the measured electrical characteristic is the capacitance.
- the alternation of supply axis / detection axis is periodic.
- the alternation of supply axis / detection axis is conditioned by the detection of an artifact.
- the alternation of supply axis / detection axis is conditioned by the reception of a signal control .
- the electronic analysis circuit controls the sensor by successively feeding, during a scanning phase, the tracks of one of the networks and by detecting the response on each of the tracks of the second network.
- the alternation of the supply axis and the detection axis corresponds to an alternation between a scanning phase with the columns as the supply axis and the lines as the detection axis, and a scanning phase with the lines as the feed axis and the columns as the detection axis.
- the invention also relates to a multicontact passive matrix touch sensor comprising means for supplying electrical power to one of the two axes of the matrix, and means for detecting electrical characteristics along the other axis of the matrix, at intersections between both axes, said touch sensor also comprising an electronic circuit according to any one of the preceding claims.
- FIG. 1 a view of a multicontact tactile display with a passive matrix
- FIG. 2 is a diagram of a method for acquiring data on the entire tactile sensor, implemented by the electronic circuit, with the columns as the supply axis and the lines as detection axis
- FIG. 3 a diagrain of the data acquisition method on the entire tactile sensor, implemented by the electronic circuit, with the lines as the supply axis and the columns as the detection axis,
- FIG. 4 is a diagram of a data analysis method implemented by the electronic circuit
- FIG. 5 is a diagram of an acquisition and analysis method implemented by an electronic circuit; according to a first embodiment of the present invention, said method comprising an alternation feed axis / periodic detection axis,
- FIG. 6, a diagram of an acquisition and analysis method implemented by an electronic circuit according to a second exemplary embodiment of the present invention, said method comprising alternating supply axis / detection axis conditioned by the possible detection of an artefact
- FIG. 7, a diagram of an acquisition and analysis method implemented by an electronic circuit according to a third embodiment of the present invention, said method comprising alternating supply axis / detection axis conditioned by a control signal.
- An electronic analysis circuit aims to integrate into a multicontact tactile matrix display passive.
- An electronic analysis circuit in accordance with the invention aims to integrate into a passive matrix multicontact tactile sensor.
- FIG. 1 represents a view of a tactile electronic device comprising:
- main processor 4 a main processor 4
- graphic processor 5 a graphic processor 5.
- the first fundamental element of said tactile device is the touch sensor 1, necessary for the acquisition - the multicontact manipulation - using a capture interface 3.
- This capture interface is the touch sensor 1, necessary for the acquisition - the multicontact manipulation - using a capture interface 3.
- 3 contains the electronic circuits of acquisition and analysis.
- Said touch sensor 1 is of the matrix type. Said sensor can be optionally divided into several parts in order to accelerate the capture, each part being scanned simultaneously.
- the main processor 4 also transmits to the graphical interface the data to be displayed on the display screen 2.
- This graphic interface can also be driven by a graphics processor 5.
- the touch sensor is controlled in the following way: one feeds successively, during a first phase of scanning, the tracks of one of the networks and the response is detected on each of the tracks of the second network.
- Contact zones corresponding to the nodes whose state is modified with respect to the idle state are determined as a function of these responses.
- One or more sets of adjacent nodes are determined whose state is changed. A set of such adjacent nodes defines a contact area. From this set of nodes is computed a position information qualified in the sense of the present cursor patent. In the case of several sets of nodes separated by non-active zones, several independent cursors will be determined during the same scanning phase.
- This information is refreshed periodically during new scan phases.
- Cursors are created, tracked or destroyed based on information obtained during successive scans.
- the cursor is for example calculated by a barycentre function of the contact zone.
- the general principle is to create as many sliders as there are zones detected on the touch sensor and to follow their evolution over time. When the user removes his fingers from the sensor, the associated sliders are destroyed. In this way, it is possible to capture the position and the evolution of several fingers on the touch sensor simultaneously.
- the electrical characteristics - voltage, capacitance or inductance - are measured at the terminals of each node of the matrix.
- the main processor 4 executes the program for associating the sensor data with graphic objects that are displayed on the display screen 2 to be manipulated.
- FIG. 2 represents a diagram of the data acquisition method on the entire touch sensor, "acquisition 1" 11, implemented by the electronic circuit, with the columns as the supply axis and the lines as the detection axis.
- Said sensor comprises M rows and N columns.
- This method has the function of determining the state of each node of the matrix sensor 1, namely whether said node is activated or not.
- Said method corresponds to the measurement of all the nodes of a "voltage" matrix.
- Said matrix is a matrix [N, M] containing at each point (I, J) the value of the voltage measured at the intersection point of line I and column J, with l ⁇ I ⁇ N and l ⁇ J ⁇ M. This matrix makes it possible to give the state of each of the points of the matrix sensor 1 at a given instant.
- the acquisition method 11 begins with an initialization step 12 of the data obtained during a previous acquisition.
- the axis of the columns constitutes the axis of supply, and the axis of the lines constitutes the axis of detection.
- the method 11 first scans the first column. It is powered for example in 5 volts.
- the electronic circuit measures an electrical characteristic at the point of intersection between said column and each of the lines from 1 to N.
- the process moves to the next column and repeat the measurements of electrical characteristics at the intersection of the new column under consideration and each of the lines from 1 to N.
- FIG. 3 represents a diagram of the data acquisition method on the entire sensor, "acquisition 2" 21, implemented by the electronic circuit, with the lines as the supply axis and the columns as the detection axis. Said method 21 is analogous to the method 11 of acquiring data "acquisition 1". Indeed, only the axes of supply and detection have been alternated.
- the electronic circuit measures the voltage across the node between said line and each of the columns from 1 to M.
- the process proceeds to the next line and resumes the measurements of voltages at the intersection of the new line considered and each of the columns from 1 to M.
- FIG. 4 represents a diagram of the "analysis" data analysis method 31 implemented by the electronic circuit.
- Said method 31 consists of a series of algorithms carrying out the following steps:
- the software is able to apply to the virtual graphic objects of the tactile electronic device the various specific processes in order to refresh said tactile electronic device in real time. Zones encompassing the contact areas detected during the acquisition step, 11 or 21, data are also defined.
- FIG. 5 represents a diagram of a method 41 of acquisition and analysis implemented by an electronic circuit according to a first embodiment of the present invention.
- Said method 41 is a method of alternating feed axis / detection axis, said alternation being periodic.
- the electronic circuit successively proceeds to acquisition 11 and analysis 31.
- the succession of steps 11 and 31 corresponds to an acquisition-analysis with the columns as the supply axis and the lines as the detection axis.
- a new succession of acquisition steps 21 and analysis 31 is performed so as to perform an acquisition-analysis with the rows as the supply axis and the columns as the detection axis.
- the method 41 performs a loop comprising the succession of steps 11, 31, 21 and 31. This allows alternating the supply and detection axes.
- the method realizes K times the first succession of steps 11 and 31, then L times the second succession of steps 21 and 31, K and L being integers of which at least one is strictly greater than 1.
- the refresh rate is of the order of 100 Hertz.
- FIG. 6 represents a diagram of a method 51 of acquisition and analysis implemented by an electronic circuit according to a second embodiment of the present invention.
- Said method 51 is a method of alternating feed axis / detection axis, said alternation being conditioned by the possible detection of an artifact.
- the method 51 performs the successive steps (11,31) and (21,31).
- transition from one to the other of the steps (11,31) and (21,31) is conditioned by the possible detection of an artefact resulting from each of the analysis steps 31 implemented.
- step 31 implemented during the succession of steps (11,31) or (21,31), the electronic circuit determines whether a parasitic phenomenon of artefact type is present on at least a portion of the array sensor 1 whose status data of each of the nodes have been acquired and analyzed. If no artefact is detected at the output of a succession of steps (11,31) or (21,31), then the process loops back on the same steps. If an artifact has been detected, then the process alternates the sequence of steps. For example, if an artefact is not detected at the output of steps (11,31), the method loops back to said steps (11,31), but if an artifact is actually detected, the method alternates on steps (21,31). 31).
- FIG. 7 represents a diagram of a method 61 of acquisition and analysis implemented by an electronic circuit according to a third embodiment of the present invention.
- Said method 61 is a method of alternating supply axis / detection axis, said alternation being conditioned by a control signal.
- the method carries out the steps (11,31) and (21,31).
- step 31 The transition from one to the other of steps (11,31) and (21,31) is conditioned by a control signal.
- the electronic circuit determines whether it has received a control signal between said succession of steps and the previous one. If no control signal has been received, then the process loops back to the same steps. If a control signal has been received, then the process alternates the succession of steps. For example, if a control signal has been received at the output of steps (11,31), the method loops back on said steps (11,31), but if a signal of command was actually received, the procedure alternates on the steps (21,31).
- a tactile electronic device provided with a multicontact tactile sensor integrating an electronic analysis circuit according to any one of the embodiments described above, has the advantage of providing an adequate solution to the appearance of parasitic phenomena as well as problems related to the resistivity of materials.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0760018A FR2925715B1 (fr) | 2007-12-19 | 2007-12-19 | Circuit electronique d'analyse a alternance axe d'alimentaiton/axe de detection pour capteur tactile multicontacts a matrice passive |
PCT/FR2008/001810 WO2009112650A1 (fr) | 2007-12-19 | 2008-12-19 | Circuit électronique d'analyse a alternance axe d'alimentation/axe de détection pour capteur tactile multicontactsà matrice passive |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2235616A1 true EP2235616A1 (fr) | 2010-10-06 |
Family
ID=39575685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08873296A Pending EP2235616A1 (fr) | 2007-12-19 | 2008-12-19 | Circuit électronique d'analyse a alternance axe d'alimentation/axe de détection pour capteur tactile multicontactsà matrice passive |
Country Status (8)
Country | Link |
---|---|
US (1) | US8363023B2 (fr) |
EP (1) | EP2235616A1 (fr) |
JP (1) | JP2011507124A (fr) |
KR (1) | KR20100110329A (fr) |
CN (1) | CN101903856A (fr) |
CA (1) | CA2709838A1 (fr) |
FR (1) | FR2925715B1 (fr) |
WO (1) | WO2009112650A1 (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925714B1 (fr) * | 2007-12-19 | 2010-01-15 | Stantum | Circuit electronique d'analyse a alternance de mesure capacitive/resistive pour capteur tactile multicontacts a matrice passive |
US20090237374A1 (en) * | 2008-03-20 | 2009-09-24 | Motorola, Inc. | Transparent pressure sensor and method for using |
US9018030B2 (en) * | 2008-03-20 | 2015-04-28 | Symbol Technologies, Inc. | Transparent force sensor and method of fabrication |
US8988191B2 (en) | 2009-08-27 | 2015-03-24 | Symbol Technologies, Inc. | Systems and methods for pressure-based authentication of an input on a touch screen |
US8963874B2 (en) | 2010-07-31 | 2015-02-24 | Symbol Technologies, Inc. | Touch screen rendering system and method of operation thereof |
JP5260694B2 (ja) * | 2011-02-28 | 2013-08-14 | 株式会社コナミデジタルエンタテインメント | 情報処理装置、情報処理装置の制御方法、及びプログラム |
CN102768589B (zh) * | 2011-05-06 | 2015-09-23 | 东莞莫仕连接器有限公司 | 触控面板 |
CN102768588B (zh) * | 2011-05-06 | 2015-11-25 | 东莞莫仕连接器有限公司 | 触控面板 |
US9501168B2 (en) * | 2011-08-10 | 2016-11-22 | Cypress Semiconductor Corporation | Methods and apparatus to detect a presence of a conductive object |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0253132A (ja) * | 1988-08-18 | 1990-02-22 | Nippon Intaakeepu:Kk | タッチパネル |
US5880411A (en) * | 1992-06-08 | 1999-03-09 | Synaptics, Incorporated | Object position detector with edge motion feature and gesture recognition |
TW408277B (en) * | 1996-11-15 | 2000-10-11 | Alps Electric Co Ltd | Small current detector circuit and locator device using the same |
US7663607B2 (en) * | 2004-05-06 | 2010-02-16 | Apple Inc. | Multipoint touchscreen |
US6762752B2 (en) * | 2001-11-29 | 2004-07-13 | N-Trig Ltd. | Dual function input device and method |
KR100456155B1 (ko) * | 2002-11-13 | 2004-11-09 | 엘지.필립스 엘시디 주식회사 | 터치패널장치 및 그 제어 방법 |
JP4408431B2 (ja) * | 2005-12-19 | 2010-02-03 | アルプス電気株式会社 | 入力装置 |
-
2007
- 2007-12-19 FR FR0760018A patent/FR2925715B1/fr not_active Expired - Fee Related
-
2008
- 2008-12-19 CA CA2709838A patent/CA2709838A1/fr not_active Abandoned
- 2008-12-19 KR KR1020107015946A patent/KR20100110329A/ko not_active Application Discontinuation
- 2008-12-19 CN CN2008801219945A patent/CN101903856A/zh active Pending
- 2008-12-19 US US12/809,344 patent/US8363023B2/en not_active Expired - Fee Related
- 2008-12-19 WO PCT/FR2008/001810 patent/WO2009112650A1/fr active Application Filing
- 2008-12-19 JP JP2010538849A patent/JP2011507124A/ja active Pending
- 2008-12-19 EP EP08873296A patent/EP2235616A1/fr active Pending
Non-Patent Citations (1)
Title |
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See references of WO2009112650A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2925715B1 (fr) | 2010-06-18 |
US20100302197A1 (en) | 2010-12-02 |
KR20100110329A (ko) | 2010-10-12 |
CA2709838A1 (fr) | 2009-09-17 |
JP2011507124A (ja) | 2011-03-03 |
US8363023B2 (en) | 2013-01-29 |
FR2925715A1 (fr) | 2009-06-26 |
WO2009112650A1 (fr) | 2009-09-17 |
CN101903856A (zh) | 2010-12-01 |
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