WO2004068332A2 - Touch simulation system and method - Google Patents
Touch simulation system and method Download PDFInfo
- Publication number
- WO2004068332A2 WO2004068332A2 PCT/US2003/037161 US0337161W WO2004068332A2 WO 2004068332 A2 WO2004068332 A2 WO 2004068332A2 US 0337161 W US0337161 W US 0337161W WO 2004068332 A2 WO2004068332 A2 WO 2004068332A2
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- WIPO (PCT)
- Prior art keywords
- touch
- touch screen
- screen sensor
- signal
- controller
- Prior art date
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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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
-
- 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
-
- 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
-
- 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
Definitions
- the present invention relates generally to touch screen sensors and, more particularly, to systems and methods for simulating an effective human touch on a touch screen sensor.
- a typical touch screen employs a sheet of glass with a conductive coating, such as indium tin oxide, with four corner terminal connections.
- the touch screen may be configured as a capacitive or resistive touch screen, with a pattern of electrodes made of conductive material.
- a finger, stylus, or conductive top sheet can draw or inject current at the point of contact. The current can then distribute to the touch panel terminals in a proportionate manner relative to the location of the point of contact.
- Touch detection accuracy of the touch screen can change over time due to a number of system and environmental reasons, such as wear during extended use.
- Monitoring, testing, and servicing of touch screen systems has conventionally involved manual evaluation of a suspect system by an on-site technician.
- Such conventional evaluation and repair approaches are both costly and time inefficient.
- a touch screen sensor includes a first surface, a second surface opposing the first surface, and one or more electrodes disposed on or proximate to the second surface. Signals are applied to the first and second surfaces in a manner which results in a simulated touch to a particular location of the touch screen sensor.
- a plurality of voltage drive signals are applied at a plurality of touch surface regions of the touch screen sensor. A current flow resulting from application of the voltage drive signals is detected as the simulated touch.
- a touch screen sensor includes a substrate having a first surface and a second surface opposing the first surface, and an electrically conductive structure coupled to, or positioned proximate, the substrate and situated proximate the second surface.
- First and second signals are respectively applied to the first surface of the touch screen sensor and the electrically conductive structure.
- a touch on the touch screen sensor is simulated by changing one of the first and second signals relative to the other of the first and second signals.
- the first and second signals are respectively applied to the first surface and electrically conductive structure to develop a potential difference between the first surface and the electrically conductive structure.
- a response to the potential difference is detected as the simulated touch.
- a touch screen sensor includes a first surface, a second surface opposing the first surface, and a plurality of electrodes disposed on or proximate to the second surface.
- a first signal is applied to the first surface of the touch screen sensor.
- One of a plurality of second signals is applied to each of the plurality of electrodes disposed on or proximate to the second surface of the touch screen sensor.
- a touch on the touch screen sensor is simulated by changing a characteristic of at least one of the plurality of second signals relative to the first signal.
- a touch sensing system includes a touch screen sensor comprising a substrate having a first surface and a second surface opposing the first surface.
- the system further includes an electrically conductive structure coupled to, or positioned proximate, the substrate and situated proximate the second surface.
- a controller is coupled to the touch screen sensor.
- the controller is configured to apply first and second signals respectively to the first surface of the touch screen sensor and the electrically conductive structure.
- the controller simulates a touch on the touch screen sensor by changing one of the first and second signals relative to the other of the first and second signals.
- a touch sensing system includes a touch screen sensor having a first surface, a second surface opposing the first surface, and a plurality of electrodes disposed on or proximate to the second surface.
- a controller coupled to the touch screen sensor, is configured to apply a first signal to the first surface of the touch screen sensor and apply one of a plurality of second signals to each of the plurality of electrodes disposed on or proximate to the second surface of the touch screen sensor.
- the controller simulates a touch on the touch screen sensor by changing a characteristic of at least one of the plurality of second signals relative to the first signal.
- a touch sensing system includes a touch screen sensor comprising a substrate having a first surface and a second surface opposing the first surface.
- a controller coupled to the touch screen sensor, is configured to apply a plurality of voltage drive signals at a plurality of regions of the touch screen sensor.
- the controller detects a current flow resulting from application of the plurality of voltage drive signals as the simulated touch.
- Touch simulation can be initiated locally or remotely as part of automated monitoring, testing, calibration, and/or servicing procedures. Results of a touch simulation procedure, such as current and historical touch detection accuracy data, can be acquired and used locally or remotely to assess the operational fitness of the touch screen sensor over time.
- Figure 1 is an illustration of a touch screen sensor system which employs a touch simulation capability in accordance with an embodiment of the present invention
- Figure 2 is an illustration of a touch screen sensor system which employs a touch simulation capability in accordance with another embodiment of the present invention
- Figure 3 illustrates a touch screen sensor system which employs a touch simulation capability, including a remote touch simulation capability, in accordance with a further embodiment of the present invention
- Figure 4 depicts a touch screen sensor system which employs a touch simulation capability in accordance with an embodiment of the present invention
- FIG. 5 is an illustration of a touch screen sensor configuration which employs a single rear electrode in accordance with an embodiment of the present invention
- Figure 6 is an illustration of a touch screen sensor configuration which employs a multiplicity of rear electrodes in accordance with an embodiment of the present invention
- Figure 7 is an illustration of a touch screen sensor configuration which employs an electrically conductive structure situated proximate a rear surface of the touch screen sensor in accordance with an embodiment of the present invention
- Figure 8 is an illustration of a touch screen sensor configuration which employs an electrically conductive frame situated proximate a rear surface of the touch screen sensor and contacting side surfaces of the touch screen sensor in accordance with an embodiment of the present invention
- Figure 9 is a flow diagram of a methodology for simulating a touch on a touch screen sensor in accordance with an embodiment of the present invention.
- Figure 10 is a flow diagram of a methodology for simulating a touch on a touch screen sensor in accordance with another embodiment of the present invention.
- Figure 11 is a flow diagram of a methodology for simulating a touch on a touch screen sensor in accordance with a further embodiment of the present invention.
- Figure 12 is a flow diagram of a methodology for simulating a touch on a touch screen sensor in accordance with yet another embodiment of the present invention
- Figure 13 is a flow diagram of a methodology for simulating a touch on a touch screen sensor in accordance with an embodiment of the present invention
- Figure 14 is a flow diagram of a methodology for remotely or locally initiating simulation of a touch on a touch screen sensor in accordance with an embodiment of the present invention
- Figure 15 is a simplified schematic of an near field imaging (NFI) capacitive touch screen sensor configured for automated touch simulation in accordance with an embodiment of the present invention.
- NFI near field imaging
- Figure 16 is a simplified schematic of a grid capacitive touch screen sensor configured for automated touch simulation in accordance with an embodiment of the present invention.
- the present invention is directed to systems and methods for simulating a touch on a touch screen sensor. Simulating a touch on a touch screen sensor (TSS) can involve processes effected from, or performed at, a remote site, such as initiating, monitoring, analyzing, or controlling a touch simulation process.
- TSS touch screen sensor
- Touch simulation methodologies implemented in accordance with the principles of the present invention provide for enhanced diagnostic, calibration, and maintenance capabilities that can be used across a number of differing touch screen sensor technologies, including, for example, capacitive, resistive, and hybrid capacitive/resistive TSS technologies.
- a touch simulation approach provides for enhanced monitoring of touch screen sensor performance in a manner that can eliminate the need for on-site testing and servicing by a skilled technician in many cases.
- Certain embodiments of the present invention provide for local initiation of touch screen sensor diagnostic and calibration tests that involve the simulation of a touch by the TSS controller or a host computing system which incorporates a touch screen sensor.
- Other embodiments of the present invention provide for remote initiation of touch screen sensor diagnostic and calibration tests that involve the simulation of a touch by the TSS controller or a host computing system which incorporates a touch screen sensor.
- Touch simulation in accordance with the present invention can be initiated by software executable by a host computing system which incorporates a touch screen system or by software/firmware executable by a TSS controller.
- the touch simulation software can be controller locally or remotely via a network connection, for example, preferably at off-peak times, during periods of TSS idleness, or during regularly scheduled maintenance.
- Each time a touch is simulated the detected position of the touch can be recorded locally, such as on the host computing system, and stored in a file or database. Over a period of time, changes in the value of the recorded touch can be tracked. Trends can be monitored and, if necessary, maintenance alert messages can be issued.
- Various operations implicated in TSS monitoring, evaluation, and repair can be performed locally, remotely, or cooperatively via local and remote resources.
- An automated touch simulation approach of the present invention provides for a highly repeatable touch that can be simulated at a prescribed screen location with high accuracy.
- the ability to simulate a touch at a prescribed location with high precision provides for a high resolution of touch detection accuracy. It can be appreciated that human touches made at a prescribed calibration location of a touch screen, for example, can be subject to significant positional inaccuracies, since a repeated human touch rarely occurs in the same location.
- a background maintenance program involving a simulated touch can be run, and any changes in touch position can be recorded. Changes over time to the touch position can be monitored, and significant variations can be reported to an operator or owner for servicing.
- a service engineer can, for example, initiate background maintenance remotely on demand over a computer network or on site. Such background maintenance routines can also be initiated locally or remotely according to a scheduled maintenance program, which may be during periods of detected system idleness or during system startup or shutdown, for example.
- a technician can remotely access the TSS system via a network or dial-up connection.
- the TSS system can be accessed via a communication link established between a remote computing system and the controller of the TSS system, assuming the TSS system includes an appropriate communications interface.
- the TSS system can be accessed via a communication link established between the remote computing system and the communications interface of a host computing system which incorporates a TSS system.
- FIG. 1 there is shown an embodiment of a touch screen sensor (TSS) system which employs a touch simulation capability in accordance with an embodiment of the present invention.
- the TSS system 20 shown in Figure 1 includes a touch screen sensor 22 which is communicatively coupled to a controller 26.
- the TSS 22 is used in combination with a display 24 of a host computing system 28 to provide for visual and tactile interaction between a user and the host computing system 28.
- the TSS 22 can be implemented as a device separate from, but operative with, a display 24 of the host computing system 28.
- the TSS 22 can be implemented as part of a unitary system which includes a display device, such as a plasma, LCD, or other type of display technology amenable to incorporation of the TSS 22. It is further understood that utility is found in a system defined to include only the TSS 22 and controller 26 which, together, can implement a touch simulation methodology of the present invention.
- communication between the TSS 22 and the host computing system 28 is effected via the controller 26.
- one or more TSS controllers 26 can be communicatively coupled to one or more touch screen sensors 22 and the host computing system 28.
- the controller 26 is typically configured to execute firmware/software that provides for detection of touches applied to the TSS 22, execution of various calibration and diagnostic routines, and simulation of a touch to the TSS 22 in accordance with the principles of the present invention. It is understood that the functions and routines executed by the controller 26 can alternatively be effected by a processor or controller of the host computing system 28.
- the host computing system 28 is configured to support an operating system and touch screen driver software.
- the host computing system 28 can further support utility software and hardware.
- software can be stored on the host computing system 28 which can be executed to calibrate the touch screen sensor 22 and to configure or setup the TSS 22.
- the various software/firmware and processing devices used to implement touch screen sensor processing and functionality in accordance with the principles of the present invention can be physically or logically associated with the TSS controller 26, host computing system 28, a remote processing system, or distributed amongst two or more of the controller 26, host computing system 28, and remote processing system. .
- the controller 26 which may be mounted to a separate card and removably installable within the host computing system chassis, typically includes processor and memory devices for storing and executing TSS operating firmware and communication firmware for communicating with the host computing system 28.
- the TSS 22 can be attached to the display 24 and include a connector interface for connecting with the controller 26.
- the host computing system 28 includes a user interface 23 which incorporates a TSS 22 and a display 24. It is noted that the user interface 23 shown in Figure 2 can include other user input or interaction devices, including a microphone and a speaker, for example.
- a controller 26 is shown coupled to the user interface 23. As previously discussed, the controller 26 may be implemented within the host computing system or the user interface 23.
- the host computing system 28 further includes one or more media drives 38 which are configured to access (read and/or write) appropriate portable media 40.
- the media drives 38 may includes one or more of a CD-ROM reader/writer, DVD drive, floppy drive, memory card reader/writer or other type of media drive.
- the host computing system 28 can also include a mass storage device 36, such as a direct access storage device (e.g., hard drive) or other form of non-volatile digital memory, and system memory 34.
- the host computing system 28 includes a communication interface 32 which provides an interface for communicating with a remote system 46 via a communication link.
- the communication interface 32 may, for example, be configured to include a network interface card (NIC) or other suitable interface for communicating with one or more networks 42.
- NIC network interface card
- the communication interface 32 may, for example, be configured to include a network interface card (NIC) or other suitable interface for communicating with one or more networks 42.
- NIC network interface card
- the communication interface 32 can be connected to a local area network which can provide access to one or more public or private networks for communicating with the remote system 46.
- the communication interface 32 may communicate with one or more networks 42 in conformance with known wired or wireless network protocols, including, for example, an IP (e.g., IPv4 or IPv6), GSM, UMTS/TMT, WAP, GPRS, ATM, SNMP, SONET, TCP/IP,
- ISDN ISDN
- FDDI FDDI
- Ethernet lOOBase-X protocol.
- Communication between the remote system 46 and the communication interface 32 of the host computing system 28 can also be established via a direct wired or wireless communication link 44, such as land line, for example.
- the remote system 46 can interact with the host computing system 28 in a wide variety of manners depending on the desired level of services and functionality required for a given application. Such services and functionality can include one or more of remote control of the host computing system 28 and/or TSS controller 26, remote touch simulation, remote monitoring, remote diagnostics, remote calibration, and remote servicing/repair, for example. In most configurations, bi-directional communication is effected between the remote system 46 and the communication interface 32. It is understood, however, that in certain system configurations, it may only be necessary or desired to provide for uni-directional communication between the remote system 46 and the host computing system 28.
- a local host computing system 28 which incorporates a touch screen sensor 22, which is configured to communicate with a remote system 46.
- a remote system 46 In the system configuration shown in Figure 3, a variety of remote systems 46 are shown for purposes of illustration.
- the remote system 46 shown in Figure 3, for example, can be implemented as a control console 56 situated remotely from the host computing system 28.
- a processing system and/or a human operator at the control console 56 can interact with the controller 26 of the TSS 22 and/or the host computing system 28 via an appropriate communication link.
- the remote system 46 can also be a node 52 of a network 42. Further, the remote system 46 can be a node 55 of a central system 54.
- Figure 3 further illustrates two possible communication paths by which a remote signal 50 is communicated between the remote system 46 and the TSS controller 26.
- the remote signal 50 is communicated between the remote system 46 and TSS controller 26 via the host computing system 28.
- the remote signal 50 is transmitted and/or received by the host computing system 28 via link 50A.
- the host computing system 28 transmits and/or receives the remote signal 50 or a processed form/result of the remote signal 50 to/from the TSS controller 26 via link 50C.
- the TSS controller 26 is indirectly linked with the remote system 46 via the host computing system 28 according to this configuration.
- the remote signal 50 is communicated directly between the remote system 46 and TSS controller 26.
- the remote signal 50 is transmitted and/or received by the TSS controller 26 via link 50B.
- the TSS controller 26 is directly linked with the remote system 46 via link 50B.
- the TSS 26 can communicate with the host computing system 28 over an appropriate connection (e.g., link
- the remote signal 50 can be selectively directed to one or both of the host computing system 28 and TSS controller 26 via links 50A and 50B depending on the nature of the remote signal 50 and other considerations.
- the TSS 70 is implemented as a capacitive touch screen sensor.
- the TSS 70 includes a substrate 72, such as glass, which has top and rear surfaces 72, 73 respectively provided with an electrically conductive coating.
- the top surface 72 is the primary surface for sensing touch.
- the top surface 72 is nominally driven with an AC voltage in the range of about 2.5 V to about 5.0 V.
- the rear surface 73 which is often referred to as a backshield (e.g., electrical noise shield), is usually driven with the same voltage as the top surface 72 so that the effective capacitance between the top and rear surfaces 72, 73 is reduced to nearly zero.
- the TSS 70 is shown to include four corner terminals 74, 76, 78, 80 to which respective wires 74a , 76a, 78a, 80a are attached. Each of the wires 74a , 76a, 78a, 80a is coupled to the TSS controller 75.
- the wires 74a , 76a, 78a, 80a connect their respective corner terminals 74, 76, 78, 80 with respective drive/sense circuits 74b, 76b, 78b, 80b provided in the controller 75.
- An additional wire 73a connects a terminal (not shown) disposed on the rear surface 73 with a drive/sense circuit 73b in the controller 75.
- the controller 75 controls the voltage at each of the corner terminals 74, 76, 78, 80 and the rear terminal via drive/sense circuits 74b, 76b, 78b, 80b, 73b to maintain a desired voltage on the top and rear surfaces 72, 73.
- the controller 75 maintains the top and rear surface voltages at substantially the same voltage.
- a finger or stylus touch force applied to the top surface 72 is detected as an effective small capacitor applied to the top surface 72.
- the location of the touch on the top surface 72 is determined by current flow measurements made by the controller 75 via corner drive/sense circuits 74b, 76b, 78b, 80b in a manner known in the art.
- the controller 75 can control the drive/sense circuits 74b, 76b, 78b, 80b, and 73b in a variety of manners in order to simulate a touch on the touch screen sensor 70. As will be described in greater detail, touch simulation can be initiated, monitored, and controlled locally and/or remotely.
- the controller 75 simulates the effect of a touch to TSS 70 by adjusting the top and rear surface voltages to develop a potential difference between the top and rear surfaces 72, 73. Developing a potential difference in this manner forces a capacitive effect between the top and rear surfaces 72, 73, which is detected by current flow measurements made at the four corner terminals 74, 76, 78, 80 by the controller 75.
- the top surface 72 can be maintained at a nominal operating voltage and the voltage of rear surface 73 can be reduced from the nominal operating voltage, such as to about 0 V for example.
- the capacitive effect resulting from the potential difference developed between the top and rear surfaces 72, 73 is detected as an effective or simulated touch located approximately at the center of the top surface 72.
- the TSS 130 includes a linearization electrode pattern 132 connected to a top resistive layer 144 which are respectively provided on a top surface 140 of the TSS 130.
- the linearization electrode pattern 132 is configured to have a generally rectangular shape with four corner terminals 134, 135, 136, 137 respectively connected to a TSS controller (not shown) via wires 134a, 135a, 136a, 137a.
- a rear electrode 142 makes electrical contact with a rear resistive layer
- drive signals are applied to the corner terminals 134, 135, 136, 137 via respective drive circuits in the controller, and the controller measures currents flowing through the corner terminals 134, 135, 136, 137 via respective sense circuits in the controller. Touch position is then calculated from the measured currents using known methods.
- the corner terminals 134, 135, 136, 137 are typically driven with an AC voltage, and the linearization electrodes 132 distribute the voltage evenly across the top resistive layer 144.
- the rear electrode 142 and rear resistive layer 143 are typically driven with an AC voltage equal to and in phase with the voltage driving corner terminals 134, 135, 136, 137.
- the rear resistive layer 143 serves as a shield against noise and also minimizes parasitic capacitance effects because negligible capacitive current flows from top resistive layer 144 to rear resistive layer 143. If the voltage on the rear resistive layer 143 is made unequal to that on the top resistive layer 144, an equal change in current flow at corner terminals 134, 135, 136, 137 will result in an apparent touch to the center of the top surface 140 of TSS 130. This simulated touch can be used for diagnostic, calibration, and repair purposes, such as those described herein.
- the TSS 130 can include a rear electrode 142 without inclusion of a rear resistive layer 143.
- the rear electrode 142 can be used as a partial shield below the linearization electrode pattern 132, which is a highly sensitive area of the touch screen sensor 130. Simulating a touch in the absence of a rear resistive layer 143 is effected by changing the voltage driven onto the rear electrode 142.
- FIG. 6 illustrates another embodiment of a touch screen sensor well suited for implementing a touch simulation methodology of the present invention.
- the touch screen sensor TSS 250 includes a linearization electrode pattern
- the linearization electrode 232 connected to a top resistive layer 244 which are respectively disposed on a top surface 240 of the TSS 250.
- the linearization electrode 232 includes four corner terminals 234, 235, 236, 237 respectively connected to a TSS controller (not shown) via wires 234a, 235a, 236a, 237a.
- the rear electrode arrangement in the embodiment of Figure 6 includes a number of discrete rear electrodes situated on the rear surface 241 of the TSS 250. In the particular configuration shown in Figure 6, four rear electrodes 251, 252, 253, 254 are located about the perimeter of the rear surface 241, with one of the rear electrodes situated along one of the edge regions of the rear surface 241 of the TSS 250.
- rear electrodes 251 , 252, 253, 254 make electrical contact with a rear resistive layer 243 provided on the rear surface 241 of the TSS 250.
- the controller (not shown) drives the rear electrodes 251 , 252, 253, 254 with an AC voltage equal to that applied at corner terminals 234, 235, 236, 237.
- the multiple rear electrodes 251, 252, 253, 254 effectively perform the same function as the single rear electrode 142 in the TSS embodiment depicted in Figure 5.
- touch simulation can be effected by varying a number of drive signal parameters, such as amplitude, phase, and frequency, relative to one another.
- the controller can apply 270 a first signal to a first surface of the touch screen sensor.
- the controller applies 272 second signals to the multiple electrodes disposed on or situated proximate the a second surface of the TSS.
- the controller simulates 274 a touch to the TSS by changing a characteristic of at least one of the second signals relative to the first signal.
- the rear electrodes 251, 252, 253, 254 can be driven with voltages differing in amplitude relative to voltages applied to other rear electrodes and/or the corner terminals 234, 235, 236, 237 on the top surface 240 of the TSS 250.
- the rear electrodes 251, 252, 253, 254 can be driven with voltages differing in phase relative to voltages applied to other rear electrodes and/or the corner terminals 234, 235, 236, 237 on the top surface 240.
- the rear electrodes 251, 252, 253, 254 can be driven with voltages differing in frequency relative to voltages applied to other rear electrodes and/or the corner terminals 234, 235, 236, 237 on the top surface 240.
- rear electrodes 252 and 254 can be undriven, while rear electrode 251 is driven with a voltage out of phase with the voltage applied to corner terminals 234, 235, 236, 237 on the top surface 240, and rear electrode 253 can be driven with a voltage in phase with the voltage applied to the corner terminals 234, 235, 236, 237.
- a simulated touch will be located at point 260 shown in Figure 6.
- the controller can drive the rear electrodes 251, 252, 253, 254 at DC, or at equal voltages, of the same frequency, and further drive the corner terminals 234, 235, 236, 237 on the top surface 240 at a voltage unequal to that applied to the rear electrodes 251, 252, 253, 254.
- This simulated touch using this approach, will be located at the center of the top surface 240 at point 261.
- Independent rear electrodes, such as rear electrodes 251, 252, 253, 254 shown in Figure 6, can be used to simulate a touch with or without the presence of rear resistive layer 243.
- a non-capacitive technique can be employed to simulate a touch on a touch screen sensor.
- this non-capacitive simulated touch technique can be employed in the presence or absence of one or both of the rear resistive layer and rear electrode(s).
- a voltage drive signal can be applied 280 at a number of regions of the touch surface of the TSS. A current flow resulting from application of the voltage drive signals is detected 282 as the simulated touch.
- the controller (not shown) can vary 292 the levels of the drive signals applied 290 to the corner terminals 234, 235, 236, 237 on the top surface 240 relative to one another, and measure the resulting current flows at each of the corner terminals 234, 235, 236, 237.
- the controller can then measure the current from each of the corner terminals 234, 235, 236, 237 relative to one another. In this way, a simulated touch can be generated 296.
- the controller can increase the drive voltage on all four corner terminals 234, 235, 236, 237 on the top surface 240 to simulate a touch to point 61 at the center of TSS 250.
- the controller can also increase the drive voltage on corner terminals
- a touch screen sensor two embodiments of a touch screen sensor are shown, each of which incorporates an electrically conductive structure which is either coupled to, or positioned proximate, the substrate of the touch screen sensor.
- an electrically conductive structure which is electrically isolated from the touch screen sensor substrate, is used in combination with the touch screen sensor substrate to effect touch simulation in accordance with the principles of the present invention.
- the electrically conductive structure can also be effectively used as a backshield to provide for shielding from electrical noise.
- a touch screen sensor 300 includes a substrate 305 having a top surface 302 provided with a conductive coating.
- Corner terminals 304, 306, 308, 310 are electrically connected to the top conductive surface 302 and a controller (not shown) via wires 304a, 306a, 308a, 310a.
- the TSS 300 can include one or more rear surface electrodes, and may include or exclude a rear resistive layer, as in the configurations shown in Figures 5 and 6.
- the electrically conductive structure can include one or more electrodes (e.g., 4 electrodes), each of which is coupled to the controller via a respective wire.
- an electrically conductive structure 312a such as a thin conductive plate or foil, is situated in a spaced apart relationship with respect to the TSS substrate 305.
- the conductive structure 312a may be positioned about 1/8" from the TSS substrate 305.
- the conductive structure 312a is electrically coupled to the controller via a wire 314.
- FIG 8 shows an embodiment in which an electrically conductive structure 312b represents a frame that provides structural support for the TSS 300.
- the frame 312b may, for example, may be configured for mounting the TSS 300 within a chassis of a system which incorporates the TSS 300.
- the frame 312b is coupled to an edge portion of the TSS substrate 305, with an appropriate coating or material provided to electrically insulate the electrically conductive portion of the frame 312b from the TSS substrate 305.
- the electrically conductive plate surface 313 of the frame 312b is situated in a spaced apart relationship with respect to the TSS substrate 305.
- the plate surface 313 of the frame 312b is electrically coupled to the controller via a wire 314.
- the controller can apply 350 a first signal to the top surface 302 of the touch screen sensor 300.
- the controller can apply 352 a second signal to the electrically conductive structure 312a/b proximate or coupled to the touch screen sensor 300.
- a touch on the touch screen sensor is simulated 354 by the controller changing one of the first and second signals relative to the other of the first and second signals.
- the controller can simulate a centered or non-centered touch on the TSS substrate 305 by varying one or more parameters of the first and second signals, including one or more of the amplitude, phase, and frequency of the drive signals.
- the controller applies drive signals to the TSS substrate 305 and the electrically conductive structure 312a/b to develop 360 a potential difference there between.
- a response to the potential difference is detected 362 as the simulated touch.
- touch simulation can be initiated, monitored, and controlled locally, remotely, or both locally and remotely.
- a remotely or locally generated touch simulation control signal is received 402, 404 by the controller of the touch screen sensor.
- a simulated touch is produced 406 in a manner previously discussed.
- One or more parameters associated with the simulated touch are detected and stored 408.
- a non-exhaustive list of such parameters include change in current, impedance, phase, voltage, or frequency; pr a change in the relationship (e.g., ratio) of currents, impedances, phases, voltages, or frequencies.
- the parameters may be stored locally or at the remote site 410.
- the parameters associated with touch simulation are acquired over a period of time.
- the TSS controller or processor of a host computing system analyzes the stored touch simulation parameters and detects a change, if any, in such parameters. It is noted that this analysis may also be performed at the remote site. A change in a given touch simulation parameter beyond a predetermined limit or range can be indicative of a problem with the touch screen sensor, such as a change in touch detection accuracy. Analysis and detection of the TSS parameters can be performed locally 412, remotely 414, or cooperatively at local and remote sites.
- a change detected in a particular TSS parameter can be compared 416 to a predetermined limit or result established from a previously measured touch simulation limit or result.
- the comparison operation can be performed locally, remotely 418, or cooperatively at local and remote sites.
- Results from a diagnostics procedure performed at the touch screen sensor can be stored and reports generated 420 locally and/or at the remote site.
- touch simulation methodologies of the present invention can be implemented in a wide range of touch screen sensor technologies.
- touch simulation methodologies in accordance with the present invention can be implemented in a near field imaging (NFI) capacitive touch screen sensor.
- NFI near field imaging
- the NFI capacitive touch screen sensor includes conductive ITO (indium-tin- oxide) bars 515 through 534, deposited on substrate 501, which define the touch sensitive surface. Bar connections 540 through 548 connect the ITO bars to an electronic controller
- a touch is detected by activating bars 515-534 with an AC signal, and measuring changes in current flowing in connections 540-548 due to capacitive coupling from one or more bars to a finger or stylus in proximity to the bar(s).
- Vertical position is determined by the relative magnitude of the change in current among the bars.
- Horizontal position is determined by measuring the ratio of current change in a bar between its left side connection (540-543) and its right side connection (544-548). Additional details of an NFI capacitive touch screen sensor of the type depicted in Figure 15 are disclosed in U.S. Patent No. 5,650,597, and in commonly owned U.S. Serial No. 09/998,614, filed November 30, 2001.
- Touch may be simulated in this system by adding simulation electrodes 505, 506, 507, 508 in proximity to the left and right ends of selected bars or in proximity to the bar connections as shown. These added electrodes may be placed on or in proximity with the rear surface of substrate 501, or they may be placed in front of bar ends or connections 540-548. The added electrodes are connected to the electronic controller (not shown). Four simulation electrodes are shown in Figure 15 for simplicity, though one simulation electrode may be placed at the end of each connection 540-548. During normal touch detection, simulation electrodes may be electrically disconnected, or driven with a signal that is equal in magnitude and phase with the signals driven onto connections 540- 548. A touch may be simulated by driving one of the left side simulation electrodes 505,
- Simulation electrodes may be grounded, or driven with an AC signal that is a different magnitude or out of phase with the signals on lines 540-548.
- grounding electrodes 505 and 507 will result in a simulated touch in the center of bar 515.
- Grounding electrodes 505 and 508 simulates a touch to the center of bar 531.
- FIG. 652- Another touch screen sensor of a technology amenable to automated touch simulation is a grid capacitive touch screen sensor.
- Figure 16 shows a grid capacitive touch screen in accordance with an embodiment of the present invention. Electrodes 652-
- Touch simulation on this type of touch screen sensor is similar to that associated with NFI capacitive touch screen sensors, in that a simulation electrode 700, 701, 702, 703 near one of the touch electrodes 652-667 or near the electrode connections 670-685 may be grounded or driven with a signal that will couple to touch electrodes and change the electrode's impedance to simulate a touch. Only four simulation electrodes are shown in Figure 16 for simplicity. As few as one simulation electrode per dimension may be used, or as many as one per touch electrode.
- capacitive coupling to touch electrodes 652-667 or electrode connections 670-685 may be accomplished by connecting standard capacitors to electrode connections 670-685.
- Such capacitors may be located on the sensor or its cable, or on the electronic controller that generates the signals that drive the sensor.
Abstract
Description
Claims
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EP03769001A EP1584064A2 (en) | 2003-01-17 | 2003-11-20 | Touch simulation system and method |
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- 2003-11-20 CN CNB2003801088202A patent/CN100338562C/en not_active Expired - Fee Related
- 2003-11-20 WO PCT/US2003/037161 patent/WO2004068332A2/en active Application Filing
- 2003-11-20 KR KR1020057013128A patent/KR20050100618A/en not_active Application Discontinuation
- 2003-11-20 AU AU2003291816A patent/AU2003291816A1/en not_active Abandoned
- 2003-11-20 EP EP03769001A patent/EP1584064A2/en not_active Withdrawn
- 2003-12-24 TW TW092136697A patent/TW200504566A/en unknown
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US7639238B2 (en) | 2001-11-30 | 2009-12-29 | 3M Innovative Properties Company | Method for simulating a touch on a touch screen |
WO2004095203A2 (en) * | 2003-03-21 | 2004-11-04 | 3M Innovative Properties Company | Remote touch simulation systems and methods |
WO2004095203A3 (en) * | 2003-03-21 | 2005-04-07 | 3M Innovative Properties Co | Remote touch simulation systems and methods |
US7236161B2 (en) | 2003-03-21 | 2007-06-26 | 3M Innovative Properties Company | Remote touch simulation systems and methods |
Also Published As
Publication number | Publication date |
---|---|
JP2006513505A (en) | 2006-04-20 |
CN1739083A (en) | 2006-02-22 |
US7362313B2 (en) | 2008-04-22 |
KR20050100618A (en) | 2005-10-19 |
AU2003291816A1 (en) | 2004-08-23 |
CN100338562C (en) | 2007-09-19 |
EP1584064A2 (en) | 2005-10-12 |
TW200504566A (en) | 2005-02-01 |
US20080211782A1 (en) | 2008-09-04 |
US20040140993A1 (en) | 2004-07-22 |
WO2004068332A3 (en) | 2004-09-23 |
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