Haptic tactile feedback with buckling mechanism

1. An input device comprising:

an elastic buckling element coupled to a spring element, the elastic buckling element configured to buckle upon application of a buckling actuator force;

a force-generating loading actuator coupled to the spring element, the force-generating loading actuator configured to, upon receiving a command signal from a processing system, store energy in the spring element; and

a force-generating buckling actuator coupled to the elastic buckling element,

wherein the force-generating buckling actuator is configured to apply the buckling actuator force to the elastic buckling element when energy is stored in the spring element and to produce a haptic event.

2. The input device of claim 1 ,

wherein applying the buckling actuator force comprises exciting the elastic buckling element at a vibratory frequency corresponding to a buckling mode in the elastic buckling element.

3. The input device of claim 2 , wherein when the exciting of the elastic buckling element at the vibratory frequency is below a buckling condition, the elastic buckling element does not buckle.

4. The input device of claim 3 , wherein when the exciting of the elastic buckling element at the vibratory frequency is above a buckling condition, the elastic buckling element creates a buckling event corresponding to the produced haptic event.

5. The input device of claim 1 , wherein the force-generating buckling actuator and the force-generating loading actuator are a single mechanical component.

6. The input device of claim 1 , wherein the spring element and the elastic buckling element are a single mechanical component.

7. The input device of claim 1 , further comprising:

a plurality of force sensor electrodes coupled to an input surface of the input device, the plurality of force sensor electrodes configured to detect the input force applied to the input surface.

8. The input device of claim 7 , further comprising:

a processing system coupled to the plurality of force sensor electrodes,

wherein the processing system is configured to compare a force information determined using the plurality of force sensor electrodes against a first force threshold and a second force threshold higher than the first force threshold.

9. The input device of claim 8 , wherein the processing system is further configured to:

when the force information exceeds the second force threshold, cause the buckling actuator to apply the buckling actuator force to the elastic buckling element, and

when the force information falls below the second threshold, cause the haptic event by applying the buckling actuator force to the elastic buckling element.

10. A processing system coupled with an input device, comprising:

a sensor module, the sensor module configured to:

obtain, from a plurality of force sensor electrodes of the input device, a plurality of resulting signals; and

a determination module, the determination module configured to:

determine, using the plurality of resulting signals, force information regarding a first input force applied to an input surface,

load, using a force-generating loading actuator and in response to a command signal generated by the processing system based on the force information, first energy in a spring element coupled to an elastic buckling element, wherein the spring element applies a compression force to the elastic buckling element based at least part on the first energy in the spring element, and

generate, using a force-generating buckling actuator and in response to the force information, a haptic event by applying a buckling actuator force to the elastic buckling element to trigger the haptic event.

11. The processing system of claim 10 , wherein the determination module is further configured to:

determine, using the force information, whether the input force exceeds a force threshold,

wherein the first energy is stored in the spring element in response to the input force exceeding the force threshold.

12. The processing system of claim 10 , wherein the determination module is further configured to:

determine, using the force information, whether the input force exceeds a first force threshold and a second force threshold higher than the first force threshold.

13. The processing system of claim 12 , wherein the determination module is further configured to:

when the force information exceeds the second force threshold, cause the buckling actuator to apply the buckling actuator force to the elastic buckling element, and

when the force information falls below the second threshold, cause the haptic event by applying the buckling actuator force to the elastic buckling element.

14. The processing system of claim 10 , wherein the determination module is further configured to:

determine whether a predetermined amount of time has passed since generating the haptic event; and

store, in response to determining that the amount of time is past, a second energy in the spring element.

15. The processing system of claim 14 ,

wherein the energy in the spring element produces a compression force, and

wherein the buckling actuator force by the force-generating buckling actuator is laterally applied to the elastic buckling element to produce the haptic event.

16. A method, comprising:

obtaining, using a plurality of resulting signals from a plurality of force sensor electrodes, force information regarding an input force applied to an input surface,

loading, using a force-generating loading actuator and in response to a command signal generated by a processing system based on the force information, energy in a spring element coupled to an elastic buckling element, wherein the spring element applies a compression force to the elastic buckling element based at least part on the energy in the spring element, and

generating, using a force-generating buckling actuator and in response to the force information, a haptic event by applying a buckling actuator force to the elastic buckling element to trigger the haptic event.