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Touch Sensitive Device

Inactive Publication Date: 2015-10-01
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution achieves simultaneous multi-region haptics with improved signal-to-noise ratio and reduced residual vibrations, providing clear and distinct tactile feedback at each sensing area even when multiple locations are touched simultaneously.

Problems solved by technology

Anywhere else on the panel will experience a combination of the signals, but this is unimportant.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

m=3, n=2

[0195]Output 1 transfer admittances: P1—1=0.472+0.00344j

[0196]Output 2 transfer admittances: P1—2=−0.206−0.195j

[0197]Output 1 transfer admittances: P2—1=0.479−0.129j

[0198]Output 2 transfer admittances: P2—2=0.262+0.000274j

[0199]Output 1 transfer admittance: P3—1=−0.067−0.180j

[0200]Output 2 transfer admittance: P3—2=0.264+0.0014j

[0201]All at Once

M1+M2=(0.3030.171-0.012j-0.087-0.034j0.171+0.012j0.3150.061-0.095j-0.087+0.034j0.061+0.095j0.107);

|M1+M2|=0

[0202]M1+M2: eigenvalues are 0, 0.218 and 0.506:

[0203]Eigenvector after scaling: (0.434−0.011j, −0.418+0.199j, 0.764+0.115j)

[0204]One at a Time

[0205]Solve output 1, and then output 2. As 3>2 we should get the same answer.

M1=(0.2230.226-0.063j-0.032-0.085j0.226+0.063j0.246-0.009-0.095j-0.032+0.085j-0.009+0.095j0.037);

|M1|=0

[0206]M1: eigenvalues are 0, 0 and 0.506:

[0207]Eigenvector V1: (0.748, −0.596−0.165j, 0.085−0.224j)

[0208]Eigenvector V2: (−0.062+0.026j, 0.096+0.350j, 0.929)

[0209]New problem; select a and b such that a·V1+b·V2...

example 2

m=3, n>=3

[0221]Here we have 1 acoustic pressure output and a number of velocity outputs.

[0222]Acoustic scaled error matrix is M1, summed velocity scaled error matrix is M2.

M1=(3.928-2.667+2.473j-2.674+2.506j-2.667-2.473j3.3673.393-0.018j-2.674-2.506j3.393+0.018j3.418);

|M1|=0

[0223]M2=(1.0230.602+0.112j-0.528+0.409j0.602+0.112j0.977-1.144+0.205j-0.528-0.409j-1.144-0.205j5.473);

|M2|=2.510

[0224]All at Once

[0225]All n output error matrices are summed and the eigenvector corresponding to the lowest eigenvalue is found.

[0226]Eigenvalues (M1+M2)=1.146, 3.869, 13.173

[0227]Solution=(0.739−0.235j, 0.483+0.306j, 0.246+0.104j)

[0228]One at a Time

[0229]Actually, we solve just the acoustics problem, then do the rest all at once. That way, the acoustics problem is solved exactly.

[0230]Eigenvalues (M1)=0, 0, 10.714

[0231]V1=(0.770−0.199j, 0.376+0.202j, 0.377+0.206j)

[0232]V2=(0.097−0.071j, 0.765+0.010j, −0.632+0.0016j)

[0233]As V1 and V2 both correspond to a zero eigenvalue, a·V1+b·V2 is also an eigenve...

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Abstract

A touch sensitive device comprising a panel capable of supporting bending waves, a user-accessible touch sensitive screen on or forming part of a face of the panel, the touch sensitive screen having a plurality of different sensing areas, a plurality of vibration exciters coupled to the panel to apply bending waves to the panel to provide tactile feedback at the plurality of sensing areas in response to the user touching a sensing area, and signal processing means arranged to apply signals to the vibration exciters so as to steer bending waves applied to the panel by the plurality of vibration exciters whereby the amplitude of the applied bending waves is maximised at the sensing area touched by the user and reduced or minimised at each other sensing area.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation application of U.S. patent application Ser. No. 12 / 921,935 filed Dec. 13, 2010 which is the U.S. National Phase of PCT Application No. JP2009 / 064365 filed 7 Aug. 2009 which claims priority to British Patent Application No. 0818117.4 filed 3 Oct. 2008, each of which are incorporated herein by reference.TECHNICAL FIELD[0002]The invention relates to touch sensitive devices including touch sensitive screens or panels.BACKGROUND ART[0003]U.S. Pat. No. 4,885,565, U.S. Pat. No. 5,638,060, U.S. Pat. No. 5,977,867, US2002 / 0075135 describe touch-operated apparatus having tactile feedback for a user when touched. In U.S. Pat. No. 4,885,565 an actuator is provided for imparting motion to the CRT when the actuator is energized to provide tactile feedback. In U.S. Pat. No. 5,638,060, a voltage is applied to a piezo-electric element which form a switch to vibrate the element to apply a reaction force to a user's finger. In U.S. Pa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/01G06F3/041
CPCG06F3/0416G06F3/016G06F3/043G06F3/04166G06F3/0418H01H13/14H01H13/70
Inventor HARRIS, NEIL JOHN
Owner GOOGLE LLC
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