METHOD AND DEVICE FOR OPERATING A RESISTIVE TOUCH INPUT COMPONENT AS A PROXIMITY SENSOR

• US 20090194341A1
• Filed: 02/05/2008
• Published: 08/06/2009
• Est. Priority Date: 02/05/2008
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Nousiainen, Jari
• Application Number:
  US12/026,165
• Publication Number:
  US 20090194341A1
• Time in Patent Office: Days
• US Class Current: 178/18.01
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3231 Monitoring the presence, absence or movement of users
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A device is provided which includes a resistive touch input component. The resistive touch input component may operate as a proximity sensor and may include upper and lower conductive layers. The upper conductive layer may be in a higher impedence state than the lower conductive layer. A method for controlling a resistive touch input component is also provided in which at least a first terminal of a device is provided for connecting the upper conductive layer in a high impedence state, and in which at least one second terminal is provided for connecting a lower conductive layer in a state capable of operating the touch input component. Corresponding computer program products and devices are also provided.

Claims

1. A device, comprising,

a resistive touch input component,

wherein said resistive touch input component comprises an upper conductive layer and a lower conductive layer, and

said upper conductive layer is in a higher impedance state than said lower conductive layer.

2. A device according to claim 1, comprising,

at least one first terminal connected to said upper conductive layer of said resistive touch input component and,

at least one second terminal connected to said lower conductive layer of said resistive touch input component,

wherein said device is configured to provide said at least one first terminal in a high impedance state with respect to said second terminals.

6. The device of claim 2, wherein said device is further configured to determine a change of the impedance of at least one first terminal.

7. The device of claim 6, wherein said device is further configured to provide a changing voltage to said at least one first terminal, and to determine said change on the impedance of said at least one first terminal by determining a change of changing current caused by said changing voltage applied to said at least one first terminal.

8. The device of claim 2, wherein said device is further configured to determine a change of the impedance of at least one second terminal.

9. The device of claim 8, wherein said device is further configured to provide a changing voltage to said at least one second terminal, and to determine said change on the impedance of said at least one first terminal by determining a change of changing current caused by said changing voltage applied to said at least one second terminal.

10. The device of claim 2, wherein said device is further provided with a proximity output, and wherein said device is configured to output a proximity signal if and when a change of impedance of at least one of the first or second terminals has been detected.

11. The device of claim 10, wherein said device is further provided with a storage to store a “

no proximity value”

for said impedance, and wherein said proximity signal is outputted if and when a difference between said stored “

no proximity value”

impedance and said determined impedance exceeds a predetermined threshold.

12. The device of claim 11, wherein said device is further configured to stop providing said direct current voltage to said at least one of the first and second terminals when a difference between said stored “

no proximity value”

impedance and said determined impedance does not exceed a predetermined threshold.

3. A device, comprising,

at least one first terminal for connecting an upper conductive layer of said resistive touch input component and,

at least one second terminal for connecting a lower conductive layer of said resistive touch input component,

wherein said device is configured to provide said at least one first terminal in a high impedance state with respect to said second terminals.

4. The device of claim 3, further comprising,

a resistive touch input component, having at least one upper conductive layer and at least one lower conductive layer,

wherein at least one first terminal is connected to an upper conductive layer of said resistive touch input component and,

wherein at least one second terminal is connected to a lower conductive layer of said resistive touch input component.

5. The device of claim 3, wherein

said device is further configured to provide a direct voltage at said at least one second terminal, and

wherein said device is further configured to determine a direct current between said at least first and second terminals, and wherein said device is further configured to determine a position of an input on the touch input component.

13. The device of claim 5, wherein said device is further configured to stop applying said changing voltage if a direct current is detected between said at least first and second terminals.

14. The device of claim 3, further comprising an electronic device having a touch input component and at least a processing unit connected to said device and said touch input component.

15. The device of claim 14, wherein said electronic device comprises a PDA, handheld gaming device, camera, GPS or navigation device, a media player or a cellular telephone.

16. A method for operating a device for controlling a resistive touch input component, said method comprising:

providing at least a first terminal of said device for connecting an upper conductive layer of said resistive touch input component in a high impedance state, and

providing each of at least one second terminal for connecting a lower conductive layer of said resistive touch input component in a state capable of operating said touch input component.

17. The method of claim 16,

wherein said device further comprises a resistive touch input component, having at least one upper conductive layer and at least one lower conductive layer,

wherein at least one first terminal is connected to an upper conductive layer of said resistive touch input component and,

wherein at least one second terminal is connected to a lower conductive layer of said resistive touch input component, and

wherein said providing at least a first terminal in a high impedance state, comprises providing said at least one connected upper layer in a high impedance state, and

wherein said providing at least a second terminal in a high impedance state comprises providing said at least one connected lower layer in a high impedance state.

18. The method of claim 16, said method comprising

providing a direct voltage at said at least one second terminal, and

if at least one direct current between said at least one first and second terminals is detected:

determining a position of a touch input on a touch input component on the basis of said detected direct current.

19. The method of claim 16, further comprising

sensing the impedance of at least one first terminal, and

if a change in the impedance of at least one first terminal is sensed:

outputting a proximity signal.

20. The method of claim 19, wherein

said sensing the impedance of at least one first terminal comprises:

providing a changing voltage to at least one first terminal, and

determining a change of changing current caused by said changing voltage applied to said at least one first terminal.

21. The method of claim 20, further comprising

sensing the impedance of at least one second terminal.

22. The method of claim 21, wherein

said sensing the impedance of at least one second terminal comprises:

providing a changing voltage to at least one second terminal, and

determining a change of changing current caused by said changing voltage applied to said at least one second terminal.

23. The method of claim 19, further comprising

sensing and storing a “

no proximity”

impedance value,

wherein said proximity signal is outputted if and when a difference between said stored “

no proximity”

impedance value and said determined impedance exceeds a predetermined threshold.

24. The method of claim 23, further comprising

stop providing said direct current voltage to said at least of the one first and second terminals when a difference between said stored “

no proximity value”

impedance and said determined impedance does not exceed a predetermined threshold.

25. The method of claim 23, further comprising

stop applying said changing voltage if a direct current is detected between said at least one first and second terminals.

26. The method of claim 23, in an electronic device having a device for a resistive touch input component, said method further comprising

changing the settings of said electronic device in dependence if the device for a resistive touch input component outputs a proximity signal or not.

27. Computer program product configured to operate an device for a resistive touch input component, comprising program code sections for carrying out the steps of claim 16, when said program is run on a device, processor-based device, a computer, a microprocessor based device, a terminal, a network device, a mobile terminal or a mobile communication enabled terminal.

28. Computer program product for executing a method configured to operate a device for a resistive touch input component, comprising program code sections stored on a machine-readable medium for carrying out the steps of claim 16, when said program product is run on a device, processor-based device, a computer, a microprocessor based device, a terminal, a network device, a mobile terminal, or a mobile communication enabled terminal.

29. A device, comprising,

a resistive touch input means,

wherein said resistive touch input means comprises an upper conductive means and a lower conductive means, and

said upper conductive means is in a higher impedance state than said lower conductive means.

30. A device for a resistive touch input component, comprising,

at least one first means for connecting an upper conductive layer of a resistive touch input component and,

at least one second means for connecting a lower conductive layer of a resistive touch input component,

wherein said device comprises means for providing said at least one first means for connecting in a high impedance state with respect to said second means for connecting.