Haptic interface for touch screen embodiments
A haptic feedback touch control used to provide input to a computer. A touch input device includes a planar touch surface that provides position information to a computer based on a location of user contact. The computer can position a cursor in a displayed graphical environment based at least in part on the position information, or perform a different function. At least one actuator is also coupled to the touch input device and outputs a force to provide a haptic sensation to the user. The actuator can move the touchpad laterally, or a separate surface member can be actuated. A flat E-core actuator, piezoelectric actuator, or other types of actuators can be used to provide forces. The touch input device can include multiple different regions to control different computer functions.
1. A method of scrolling in a touch screen comprising:
displaying, via a touch screen, a graphical user interface, wherein the touch screen is coupled to a processor configured to provide the graphical user interface;
sensing a user's input onto the touch screen via a sensor coupled to the touch screen, wherein the user's input causes graphical objects in the graphical user interface to scroll in a vertical direction, the sensor outputting a sensor signal associated with a rate of the scrolling of the graphical objects;
processing the sensor signal and outputting an activating signal based on the rate of scrolling indicated by the sensor signal; and
outputting a plurality of haptic effect pulses via an actuator to be felt by the user, the pulses output at a rate proportional to the rate of scrolling indicated by the sensor signal.
2. The method of claim 1 , wherein outputting a plurality of haptic effect pulses via an actuator comprises driving the actuator via an oscillation circuit.
3. The method of claim 2 , wherein driving the actuator via an oscillation circuit comprises starting or stopping the actuator via a gating feature.
4. The method of claim 2 , wherein driving the actuator via an oscillation circuit comprises modulating an amplitude of the plurality of haptic effect pulses.
5. The method of claim 1 , wherein the actuator comprises one or more of: an inertial linear actuator or a linear rotary actuator.
6. The method of claim 5 , wherein the actuator is coupled to the touch screen via a flexure.
7. The method of claim 1 , wherein the graphical object comprises one or more of: an icon, a window, a menu item, a graphical button, a slider bar, or a scroll bar.
8. A device, comprising:
a touch screen configured to display a graphical user interface;
a sensor coupled to the touch screen and configured to:
sense an input onto the touch screen, wherein the input causes a graphical object in the graphical user interface to scroll in a vertical direction, and
output a sensor signal associated with a rate of the scrolling of the graphical objects;
a processor coupled to the touch screen, wherein the processor is configured to provide the graphical user interface, process the sensor signal and output an activating signal based on the rate of scrolling indicated by the sensor signal; and
an actuator coupled to the processor, the actuator configured to output a plurality of haptic effect pulses, the pulses output at a rate proportional to the rate of scrolling indicated by the sensor signal.
9. The device of claim 8 , further comprising: an oscillation circuit that drives the actuator.
10. The device of claim 9 , wherein the oscillation circuit starts or stops the actuator via a gating feature.
11. The device of claim 9 , wherein the oscillation circuit modulates an amplitude of the plurality of haptic effect pulses.
12. The device of claim 8 , wherein the actuator comprises one or more of: an inertial linear actuator or a linear rotary actuator.
13. The device of claim 12 , wherein the actuator is coupled to the touch screen via a flexure.
14. The device of claim 8 , wherein the graphical object comprises one or more of: an icon, a window, a menu item, a graphical button, a slider bar, or a scroll bar.