Haptic display with simultaneous sensing and actuation
Touch interface devices and methods for producing multi-point haptics utilizing simultaneous sensing and actuation are disclosed. In one configuration, one or more electrodes connected to a front surface of a substrate are arranged in a pattern and connected to an electronic controller configured to produce a haptic effect by applying one or more voltages to the electrodes, and measure the locations of one or more touch points by applying one or more voltages to the electrodes. In another configuration the electronic controller is configured to produce a haptic effect by applying positive and/or negative voltages to the electrodes, and measure the locations of one or more touch points by applying positive and/or negative voltages to the electrodes. Also disclosed is a method for using a single set of electrodes on a substrate of a touch interface to simultaneously produce haptic effects on the substrate and measure finger locations relative to the substrate.
1. A touch interface having simultaneous sensing and actuation comprising:
an insulating substrate;
a plurality of electrodes connected to a front surface of the substrate and being arranged in a pattern;
an electronic controller configured to connect each electrode to a sensing voltage and an actuating voltage;
said electronic controller configured to produce a haptic effect by applying the actuating voltage to said electrodes, wherein the actuating voltage comprises at least one actuating pulse, wherein the electronic controller is configured to strengthen the haptic effect by modulating at least one of a duration of the at least one actuating pulse, frequency of the at least one actuating pulse, and number of actuating pulses; and
said electronic controller configured to measure locations of touch points by applying the sensing voltage to said electrodes, wherein a level of the sensing voltage and a level of the actuating voltage are substantially the same, wherein the sensing voltage comprises at least one sensing pulse, wherein the electronic controller is configured to reduce or eliminate a user's perception of the sensing voltage by modulating at least one of a duration of the at least one sensing pulse, frequency of the at least one sensing pulse, and number of sensing pulses, wherein the haptic effect is more perceptible to a user than the sensing voltage.
2. The touch interface of claim 1 wherein the sensing and actuating voltage are applied to the electrodes with positive and negative voltage components.
3. The touch interface of claim 2 wherein the actuating voltage is applied by the electronic controller to the electrodes at the touch points in pulse width modulated pulses.
4. The touch interface of claim 1 wherein the sensing and actuating voltages include a positive voltage and a negative voltage applied alternately.
5. The touch interface of claim 1 wherein the electrodes include a protective layer.
6. The touch interface of claim 5 wherein the protective layer is transparent.
7. The touch interface of claim 5 wherein the protective layer is made of a dielectric material.
8. The touch interface of claim 1 wherein the sensing voltage is applied by the electronic controller to each electrode in a single pulse having a duration less than 100 microseconds, and wherein the electronic controller is configured to scan the plurality of electrodes at a rate of 500 Hz or greater.
9. The touch interface of claim 1 wherein the actuating voltage is applied by the electronic controller to each electrode in at least 50 pulses, wherein each pulse is at a length of 50 microseconds or greater, and wherein each pulse is at a rate of 100 Hz or greater to create the haptic effect.
10. The touch interface of claim 1 wherein the haptic effect provided by the electrodes is an increase in friction.
11. The touch interface of claim 1 wherein the haptic effect is independently controllable at more than one touch location.
12. The touch interface of claim 1 wherein the device provides measurements of positions of more than one touch location.
13. The touch interface of claim 1 wherein the one or more electrodes are arranged in an aligned pattern presenting an array having two or more lines of different electrodes that present intersection locations.
14. The touch interface of claim 1 wherein the sensing voltage is applied by the electronic controller to each electrode in a single pulse having a duration less than 100 microseconds.
15. The touch interface of claim 14 wherein the electronic controller is configured to drive the single pulse to zero after being applied.
16. The touch interface of claim 1 wherein the electronic controller is configured to scan the plurality of electrodes at a rate of 500 Hz or greater.
17. The touch interface of claim 1 wherein the actuating voltage is applied by the electronic controller to the electrodes at the touch points in a sequence of a series of pulses during a first period and a second period without pulses.
18. A method of using a plurality of electrodes disposed on a front surface of an insulating substrate of a touch interface arranged in a pattern to simultaneously produce haptic effects on the substrate and measure finger locations relative to the substrate, the method comprising:
providing a controller that is connect to each electrode;
applying at least one sensing voltage pulse to each of the electrodes to measure locations of touch points,
wherein the electronic controller reduces or eliminates a user's perception of the sensing voltage pulse by modulating at least one of a duration of the at least one sensing voltage pulse, frequency of the at least one sensing voltage pulse, and number of sensing voltage pulses;
applying at least one actuating voltage pulse to the touch points to produce the haptic effect,
wherein the electronic controller strengthens the haptic effect by modulating at least one of a duration of the at least one actuating voltage pulse, frequency of the at least one actuating voltage pulse, and number of actuating voltage pulses, wherein the haptic effect is more perceptible to a user than the at least one sensing voltage pulse and wherein a level of the at least one sensing voltage pulse and a level of the at least one actuating voltage pulse are substantially the same.
19. A touch interface having simultaneous sensing and actuation comprising:
an insulating substrate;
a plurality of electrodes connected to a front surface of the substrate and being arranged in a pattern;
an electronic controller configured to connect each electrode to a sensing voltage and an actuating voltage;
wherein the actuating voltage comprises a plurality of actuating pulses, wherein said electronic controller is configured to produce a haptic effect by applying the plurality of actuating pulses to said electrodes, wherein the plurality of actuating pulses comprises at least 50 actuating pulses, wherein each actuating pulse is at a duration of 50 microseconds or greater, and wherein each pulse is at a rate of 100 Hz or greater; and
wherein the sensing voltage comprises a single sensing pulse, wherein said electronic controller configured to measure locations of touch points by applying the single sensing pulse to each electrode, wherein the single sensing pulse has a duration of 100 microseconds or less and a rate of 500 Hz or greater, and wherein a level of the sensing voltage is substantially the same as a level of the actuating voltage.