Reconfigurable tactile sensor input device

• US 7,609,178 B2
• Filed: 04/20/2006
• Issued: 10/27/2009
• Est. Priority Date: 04/20/2006
• Status: Expired due to Fees

• Current Assignee: Wisetouch Co, Ltd
• Original Assignee: Pressure Profile Systems Inc. (PPS U.K. Limited)
• Inventors: Ables, David, Dobie, Gordon, Son, Jae S.
• Primary Examiner(s): WONG, ALBERT KANG
• Application Number:
  US11/407,535
• Publication Number:
  US 20070257821A1
• Time in Patent Office: 1,286 Days
• Field of Search: 341/20, 341/22, 341/33, 345/168, 345/173, 345/158, 200/600, 361/287
• US Class Current: 341/33
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: G06F 3/04886 by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2017/9613 using two electrodes per touch switch
• CPC Class Codes: H03K 2217/96031 Combination of touch switch and LC display
• CPC Class Codes: H03K 2217/96062 with tactile or haptic feedback
• CPC Class Codes: H03K 2217/960755 Constructional details of capacitive touch and proximity switches

Abstract

A reconfigurable tactile input device includes a first rigid electrode layer, a compressible dielectric structure, and a second flexible electrode layer forming together a tactile sensor with appropriate electrode connection means to a control means. The control means may include a mixed-signal IC mounted next to the input device in a compact package and capable of measuring capacitance in real time. The dielectric structure may include a matrix of compressible geometric elements with voids therebetween optionally vented to atmosphere, making the entire assembly thin and facilitating its use for mobile phones and other small, portable electronic devices. Some embodiments provide the user wit tactile feedback upon compression of the electrodes. An optional flexible display may be mounted over the input device to indicate the present configuration to the user.

Claims

1. A reconfigurable tactile input device comprising:

a first electrode layer having a first electrical connection means,

a flexible second electrode layer having a second electrical connection means,

at least one of the first or second electrode layers comprising more than one electrode,

a compressible dielectric structure separating said first electrode layer from said second electrode layer, said structure comprising a plurality of geometric elements made of compressible dielectric material forming voids therebetween, said plurality of geometric elements located beneath at least one electrode of said second flexible electrode layer, and

a control means connected to said first and said second electrical connection means and adapted to measure capacitance in real time between electrodes of said first and said second electrode layers,

whereby when a change in capacitance of at least one of said electrodes is detected, it is measured and converted by said control means into contact position and force of compression over said input device, which is then transformed into a recognized user input command signal based on a current input device configuration;

said configuration being reconfigurable through said control means.

2. The input device as in claim 1, wherein said first or said second layer of electrodes comprising a plurality of discrete “

button”

-type electrodes, each of said electrodes supplied with individual electrical connection point, said adjacent “

button”

-type electrodes have an interweaving overlap therebetween whereby adjacent electrodes are shaped to have protrusions extending into a space therebetween in an alternating manner to allow mechanical coupling as in a slider control.

3. The input device as in claim 1, wherein said first layer of electrodes comprising a first plurality of discrete “

button”

-type electrodes, said second layer of electrodes comprising a second plurality of discrete “

button”

-type electrodes said first plurality of “

button”

-type electrodes are generally arranged in rows via a first series of interconnecting electrical paths customized to a specific user interface and functional configuration said second plurality of “

button”

-type electrodes are generally arranged in columns via a second series of interconnecting electrical paths also customized to said specific user interface and functional configuration, said rows of the first layer overlapping said columns of the second layer over said compressible dielectric structure separating said rows from said columns.

4. The input device as in claim 1, wherein said first electrode layer comprising first individual electrodes made as parallel strips, said second electrode layer comprising second individual electrodes made as parallel strips oriented generally perpendicular to the first electrodes and overlapping thereof over said compressible dielectric structure, thereby forming a capacitance measuring matrix of electrodes.

5. The input device as in claim 1, wherein said electrodes are made from metal or conductive organic material and having an electrode pattern produced using a method selected from a group consisting of etching, sputtering, vapor deposition, application of ink suspension, indium tin-oxide, or providing a cloth made of conductive fibers and cut into desired shape.

6. A reconfigurable tactile input device comprising:

a first electrode layer having a first electrical connection means,

a flexible second electrode layer having a second electrical connection means, at least one of the first or second electrode layers comprising more than one electrodes,

a compressible dielectric structure separating said first electrode layer from said second electrode layer, said structure comprising a plurality of geometric elements made of compressible dielectric material forming voids therebetween, said plurality of geometric elements located beneath at least one electrode of said second flexible electrode layer, and

a control means connected to said first and said second electrical connection means and adapted to measure capacitance in real time between electrodes of said first and said second electrode layers,

whereby when a change in capacitance of at least one of said electrodes is detected, it is measured and converted by said control means into contact position and force of compression over said input device.

7. The input device as in claim 6, wherein said plurality of geometric elements of said dielectric structure are arranged in repeating patterns, whereby said input device having uniform compressibility over at least a portion of the device.

8. The input device as in claim 6, wherein said voids are vented to atmosphere.

9. The input device as in claim 6 wherein said voids are sealed and connected to each other.

10. The input device as in claim 6, wherein said geometric elements of said compressible dielectric structure are selected from the group consisting of strips, columns, curves, polygons, or dots.

11. The input device as in claim 6, wherein said compressible dielectric structure is made from an elastic material.

12. The input device as in claim 6, wherein said geometric elements of said compressible dielectric structure have a predetermined column strength, whereby they collapse upon applying pressure onto said device at any place over its entire surface when such pressure exceeding a predetermined threshold value to provide tactile feedback to a user.

13. The input device as in claim 6, wherein said geometric elements of said compressible dielectric structure exhibit a first linear phase of compression followed by a second non-linear phase of compression once that compression at any place over its entire surface exceeds a predetermined threshold value.

14. The input device as in claim 6, wherein said geometric elements of said compressible structure include an indentation defining a point of collapse once compression applied to said device at any place over its entire surface exceeds a predetermined threshold value.

15. A reconfigurable tactile input device comprising:

a first electrode layer having a first electrical connection means,

a flexible second electrode layer having a second electrical connection means,

at least one of the first or second electrode layers comprising more than one electrode,

a compressible dielectric structure separating said first electrode layer from said second electrode layer, said structure comprising a plurality of geometric elements made of compressible dielectric material forming voids therebetween, said plurality of geometric elements located beneath at least one electrode of said second flexible electrode layer, and

a control means connected to said first and said second electrical connection means, said control means including an IC mounted in the vicinity of said electrode layers adapted to measure capacitance in real time between electrodes of said first and said second electrode layers,

whereby when a change in capacitance of at least one of said electrodes is detected, it is measured and converted by said control means into contact position and force of compression over said input device.

16. The input device as in claim 15, wherein said IC is adapted to perform as a slave peripheral to conduct signal conditioning, filtering, bias compensation as well as position and force calculations with a digital interface.

17. The input device as in claim 15, wherein said IC further comprising a reprogrammable microcontroller adapted to perform either as a primary controller for said input device or as a slave peripheral with a digital interface.

18. The device as in claim 17 , wherein said IC is an ASIC of a mixed-signal type adapted to measure capacitance in real time between electrodes of said first and said second electrode layers and perform signal processing functions including calculations of contact centroid location, force, and trajectory, said functions further including digital filtering for noise reduction and erroneous contact discrimination.

19. A reconfigurable tactile input device comprising:

a first electrode layer,

a flexible second electrode layer,

at least one of the first or second electrode layers comprising more than one electrode,

a compressible dielectric structure separating said first electrode layer from said second electrode layer, said structure comprising a plurality of geometric elements made of compressible dielectric material forming voids therebetween, said plurality of geometric elements located beneath at least one electrode of said second flexible electrode layer,

a flexible display mounted over at least a portion of said second electrode layer, and

a control means connected to said first electrode layer, said second electrode layer, and said flexible display, said control means adapted to change the configuration of said flexible display to correspond to the change in operational mode configuration of said input device.

20. The input device as in claim 19, wherein configurations of said flexible display correspond to configurations of electrodes for said first and said second electrode layers.

21. The input device as in claim 19, wherein configurations of said flexible display correspond to operational modes but do not correspond to the physical layout of the electrodes.

22. The input device as in claim 19, wherein said flexible display is an electroluminescent display.

23. The input device as in claim 19, wherein said flexible display is an organic LED display.

24. The input device as in claim 19, wherein said flexible display is an “

electronic ink”

display.

25. The input device as in claim 19, wherein said flexible display is a multi-segmented display.

26. The input device as in claim 19, wherein said flexible display is an active matrix display.

27. The device as in claim 26, wherein said active matrix display is a Thin Film Transistor TFT Matrix display.

28. The input device as in claim 19, wherein said display is adapted to provide at least two different modes of operation.

29. The input device as in claim 28, wherein said modes of operation are selected from the group consisting of a “

freeform”

mode, a “

phone”

mode, a “

navigation”

mode, and a “

game”

mode.

30. The input device as in claim 19 further including separate control means for changing the flexible display configuration and reading the sensor input.