Pressure-sensitive input device for data processing systems

• US 7,324,095 B2
• Filed: 11/01/2004
• Issued: 01/29/2008
• Est. Priority Date: 11/01/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Sharma, Manish
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Said; Mansour M.
• Application Number:
  US10/978,878
• Publication Number:
  US 20060092139A1
• Time in Patent Office: 1,184 Days
• Field of Search: 345156-158, 345/166, 345/168, 345173-177, 345/179, 178/18.01, 178/18.03, 178/18.05, 178/18.06, 178/19.01
• US Class Current: 345/175
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04809 Textured surface identifying touch areas, e.g. overlay structure for a virtual keyboard
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

Provided is a pressure sensitive input device for data processing systems. In a particular embodiment, the device includes a transferable overlay for placement over a display screen of the system. Rows and columns of parallel conductors, which may be manufactured as ridges, are positioned to cross within the overlay, and are separated by a deformable isolation layer. A current is flowed across the rows and columns. Any change in the distance between the rows and columns, induced by the pressure of a user input, produces a disruption in the current flow. A proportional analog response signal is transmitted to a processor, wherein the signal is used to calculate a location of the user input, and a differential in the input pressure. The device may receive and process multiple, simultaneous inputs at various locations on the overlay. An appropriate method of use for the pressure-sensitive input device is also provided.

Claims

1. A pressure-sensitive input device for data processing systems comprising:

a transferable overlay having;

an inner surface oriented toward a supporting structure, and an outer surface spaced a distance above the inner surface;

a plurality of substantially parallel conductive columns disposed within the transferable overlay proximate to the inner surface;

a plurality of substantially parallel conductive rows disposed within the transferable overlay proximate to the outer surface and oriented to cross the conductive columns; and

a deformable isolation layer, disposed between the conductive columns and the conductive rows, wherein the user input deforms the isolation layer and changes a distance between the conductive columns and the conductive rows, and further wherein the change in distance between the conductive columns and the conductive rows alters a flow of current conducted across the conductive columns and conductive rows;

a controller to detect at least one analog response signal generated in response to pressure exerted on the outer surface by a user input; and

a processor, in electronic communication with the controller, wherein the processor receives the analog response signal and calculates both a location of the user input on the outer surface, and a differential in pressure exerted on the outer surface by the user input.

2. The input device of claim 1, further comprising a plurality of sensors mounted within the transferable overlay to detect the user input, at least one sensor transmitting the analog response signal to the controller in response to the user input.

3. The input device of claim 1, wherein the overlay is a roll-up keyboard positioned in close proximity to the data processing system.

4. The input device of claim 1, wherein the supporting structure is a display screen of the processing system.

5. The input device of claim 1, wherein the conductive columns comprise a first plurality of ridges, each ridge of the first plurality of ridges having a conductive top surface substantially parallel to the inner surface, and further wherein the conductive rows comprise a second plurality of ridges, each ridge of the second plurality of ridges having a conductive top surface substantially parallel to the outer surface and oriented toward the top surfaces of the first plurality of ridges.

6. The input device of claim 1, wherein the plurality of conductive rows defines a plane substantially parallel to a plane defined by the plurality of conductive columns.

7. The input device of claim 1, wherein the plurality of conductive rows and plurality of conductive columns are translucent.

8. The input device of claim 1, wherein the plurality of conductive rows and plurality of conductive columns comprise Indium Tin Oxide.

9. The input device of claim 1, wherein the deformable isolation layer is an elastic polymer membrane.

10. The input device of claim 1, wherein the deformable isolation layer is a viscous fluid.

11. The input device of claim 1, wherein the deformable isolation layer is substantially dielectric in a relaxed state, and further wherein the deformable isolation layer acts as a conductor when compressed by the pressure of the user input.

12. A pressure-sensitive input device for data processing systems comprising:

an overlay having an inner surface and an outer surface spaced a distance above the inner surface;

a first plurality of substantially parallel ridges disposed upon the inner surface, each ridge having a conductive top surface providing a conductive row;

a second plurality of substantially parallel ridges disposed upon the outer surface, each ridge having a conductive top surface providing a conductive column, the second plurality of ridges crossing the first plurality of ridges;

a deformable isolation layer disposed between the conductive columns and the conductive rows;

the isolation relative to a degree of deformation from pressure exerted on the outer surface by a user; and

a controller being operable to detect at least one analog response signal generated between at least one conductive row and at least one conductive column in response to pressure exerted upon the outer surface by a user input.

13. The input device of claim 12, further including a processor in electrical communication with the controller, the processor operable to receive the at least one analog signal and calculate at least one location of the user input upon the outer surface, and at least one value of pressure applied.

14. The input device of claim 12, wherein the plurality of ridges disposed upon the outer surface permits asymmetric deformation of the outer surface.

15. The input device of claim 12, wherein the plurality of conductive rows and the plurality of conductive columns comprise Indium Tin Oxide.

16. The input device of claim 12, wherein the overlay is transferable.

17. The input device of claim 12, wherein the overlay is a roll-up keyboard positioned in close proximity to the data processing system.

18. The input device of claim 12, wherein the overlay is translucent.

19. A pressure-sensitive input device for data processing systems comprising:

an analog means for detecting a user input on a transferable overlay, wherein the overlay includes;

an inner surface oriented toward a supporting structure, and an outer surface spaced a distance above the inner surface;

a plurality of substantially parallel conductive columns disposed within the transferable overlay proximate to the inner surface;

a plurality of substantially parallel conductive rows disposed within the transferable overlay proximate to the outer surface and oriented to cross the conductive columns; and

a deformable isolation layer, disposed between the conductive columns and the conductive rows, wherein the user input deforms the isolation layer and changes a distance between the conductive columns and the conductive rows, and further wherein the change in distance between the conductive columns and the conductive rows alters a flow of current conducted across the conductive columns and the conductive rows;

a means for sensing at least one analog response signal transmitted from the overlay, wherein the analog response signal is proportional to a pressure exerted by a user input on the outer surface; and

a means for processing the analog response signal to calculate both a position of the user input on the outer surface, and a differential in the pressure exerted on the outer surface by the user input.

20. The input device of claim 19, wherein the device is transparent.

21. The input device of claim 19, wherein the overlay is a roll-up keyboard positioned in close proximity to the data processing system.

22. The input device of claim 19, wherein the supporting structure is a display screen of the processing system.

23. The input device of claim 19, wherein the detecting means is a plurality of sensors disposed within the transferable overlay to detect the user input.

24. The input device of claim 19, wherein the conductive columns comprise a first plurality of ridges, each ridge of the first plurality of ridges having a conductive top surface substantially parallel to the inner surface, and further wherein the conductive rows comprise a second plurality of ridges, each ridge of the second plurality of ridges having a conductive top surface substantially parallel to the outer surface and oriented toward the top surfaces of the first plurality of ridges.

25. The input device of claim 19, wherein the deformable isolation layer is an elastic polymer membrane.

26. The input device of claim 19, wherein the deformable isolation layer is a viscous fluid.

27. The input device of claim 19, wherein the deformable isolation layer is substantially dielectric in a relaxed state, and further wherein the deformable isolation layer acts as a conductor when compressed by the user input.

28. A method for inputting information into a data processing system using a pressure-sensitive input device, the method comprising:

providing a transferable overlay having an inner surface oriented toward a supporting structure, and an outer surface spaced a distance above the inner surface, wherein a plurality of conductive columns is disposed within the overlay proximate to the inner surface, and wherein a plurality of conductive rows is disposed within the overlay proximate to the outer surface and oriented to cross the conductive columns, and further wherein the conductive columns and the conductive rows are disposed within a deformable medium therebetween;

applying pressure to at least one location on the outer surface of the transferable overlay, such that a distance between at least a portion of the conductive rows and a portion of the conductive columns is changed;

generating an analog response signal wherein the analog response signal is proportional to the change in the distance between the conductive rows and the conductive columns;

transmitting to a processor the analog response signal; and

processing the analog response signal to calculate both a location of the user input on the outer surface and a differential in pressure exerted on the outer surface by the user input.

29. The method of claim 28, wherein the deformable medium is substantially dielectric in a relaxed state, and further wherein the deformable medium acts as a conductor when compressed by the user input.

30. The method of claim 28, wherein the analog response signal is generated by at least one sensor electrically connected to the conductive rows and the conductive columns at a cross point of the conductive rows and the conductive columns.

31. The method of claim 28, wherein the supporting structure is a display screen of the processing system.

32. The method of claim 28, wherein the supporting structure is a desk, table, user'"'"'s lap, or counter.

33. The method of claim 28, further comprising the step of executing a software program to configure an input display according to requirements of a user, wherein the input display is visually presented on a display screen of the data processing system and projected through the transferable overlay, which is substantially transparent.

34. The method of claim 28, wherein the conductive columns comprise a first plurality of ridges, each ridge of the first plurality of ridges having a conductive top surface substantially parallel to the inner surface, and further wherein the conductive rows comprise a second plurality of ridges, each ridge of the second plurality of ridges having a conductive top surface substantially parallel to the outer surface and oriented toward the top surfaces of the first plurality of ridges.