Portable electronic device including tactile touch-sensitive input device and method of protecting same

• US 8,553,006 B2
• Filed: 09/11/2012
• Issued: 10/08/2013
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Faubert, Perry Allan, Griffin, Jason Tyler
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): LAM, VINH TANG
• Application Number:
  US13/610,713
• Publication Number:
  US 20120327011A1
• Time in Patent Office: 392 Days
• Field of Search: 345173-178, 345/158, 178 1801- 1903
• US Class Current: 345/173
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/1643 the display being associated to a digitizer, e.g. laptops that can be used as penpads details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/04142 the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate

Abstract

A portable electronic device includes a housing with a base. A touch-sensitive input assembly is spaced from and moveable relative to the base and a stopping arrangement limits movement of the touch-sensitive input assembly in the direction of the base. An actuating arrangement including a piezoelectric actuator for selectively receiving an applied voltage to thereby apply a force to the touch-sensitive input assembly. An accelerometer and functional components are housed within the housing. The functional components include a memory and a processor operably connected to the memory, the touch-sensitive input assembly, the piezoelectric actuator, and the accelerometer to monitor signals from the accelerometer and, if a fall is detected, apply a negative voltage to the piezoelectric actuator causing reverse bending of the piezoelectric actuator to permit the stopping arrangement to limit movement of the touch-sensitive input assembly and thereby limit force exerted on the piezoelectric actuator.

Claims

1. A portable electronic device comprising:

a base;

a touch-sensitive display spaced from and moveable relative to the base;

a stopping arrangement to limit movement of the touch-sensitive display in the direction of the base;

an accelerometer operable to detect a fall;

an actuating arrangement comprising a piezoelectric actuator disposed between the touch-sensitive display and the base and operable to selectively receive an applied voltage to apply a force to the touch-sensitive display and to receive a reverse voltage, in response to detecting a fall, to cause reverse bending of the piezoelectric actuator to facilitate use of the stopping arrangement to limit movement of the touch-sensitive display.

2. The portable electronic device according to claim 1, wherein the piezoelectric actuator comprises a piezo disk actuator.

3. The portable electronic device according to claim 2, wherein the piezo disk actuator comprises a piezoelectric disk adhered to a metal or ceramic substrate.

4. The portable electronic device according to claim 2, comprising a protrusion between the base and the touch-sensitive display for engaging the piezo disk actuator proximal a center of the piezo-disk actuator.

5. The portable electronic device according to claim 4, wherein the protrusion extends between the base and the piezo disk actuator.

6. The portable electronic device according to claim 5, wherein the piezo disk actuator is mounted on the protrusion.

7. The portable electronic device according to claim 3, wherein the protrusion is disposed on the concave side of the piezo disk actuator during application of the reverse voltage causing reverse bending.

8. The portable electronic device according to claim 3, comprising a support ring between the base and the touch-sensitive display for engaging the piezo disk actuator proximal a perimeter of the piezo disk actuator and wherein said reverse bending of the piezo disk actuator comprises bending away from said support ring.

9. The portable electronic device according to claim 2, comprising a force sensor between the touch-sensitive display and the base for determining an external applied force on the touch-sensitive display.

10. The portable electronic device according to claim 9, wherein the force sensor is disposed between the piezo disk actuator and the base.

11. The portable electronic device according to claim 2 wherein the actuating arrangement comprises a plurality of piezo disk actuators disposed between the touch-sensitive display and the base.

12. The portable electronic device according to claim 11, comprising a piezo driver in communication with the processor for controlling application of voltage including the applied voltage to apply a force to the touch-sensitive display and the reverse voltage for reverse bending of the piezo disk actuators.

13. The portable electronic device according to claim 2, wherein the processor is a microprocessor and the portable electronic device comprises a main processor connected to the microprocessor for communicating therewith.

14. The portable electronic device according to claim 13, wherein the microprocessor is connected to the touch-sensitive display via the main processor.

15. The portable electronic device according to claim 13, wherein the microprocessor is connected to the accelerometer via the main processor.

17. A computer-readable medium having computer-readable code embodied therein, the computer-readable code executable by a processor in a portable electronic device according to claim 1 to cause the portable electronic device to monitor signals from the accelerometer, and when a fall is detected based on the signals from the accelerometer, apply the reverse voltage to the piezoelectric actuator causing reverse bending of the piezoelectric actuator to facilitate use of the stopping arrangement to limit movement of the touch-sensitive display.

16. A method of protecting components of a portable electronic device comprising a base, a touch-sensitive display spaced from and moveable relative to the base, a stopping arrangement to limit movement of the touch-sensitive display in the direction of the base, an accelerometer to detect a fall;

an actuating arrangement comprising a piezoelectric actuator disposed between the touch-sensitive display and the base to receive an applied voltage and, in response, to apply a force to the touch-sensitive display, the method comprising;

detecting a fall based on signals from the accelerometer;

in response to detecting the fall, applying a reverse voltage to the piezelectric actuator to cause reverse bending of the piezoelectric actuator and facilitate use of the stopping arrangement to limit movement of the touch-sensitive display.