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The invention is a touch sensitive device that uses bending waves to provide tactile feedback to the user. The device includes a panel that supports bending waves, a touch screen with multiple sensing areas, and vibration exciters that apply bending waves to the panel in response to user touch. The device also includes signal processing means that control the vibration exciters to optimize the amplitude of bending waves at the sensing area touched by the user and minimize it at other areas. Using a greater number of vibration exciters or processing signals to simultaneously provide feedback to multiple sensing areas can improve the tactile response and reduce crosstalk between the areas. Additionally, the device can be designed to reduce edge reflections of bending wave vibration and improve the overall haptic experience.
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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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
[0233]As V1 and V2 both correspond to a zero eigenvalue, a·V1+b·V2 is also an eigenve...
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PUM
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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)
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