Apparatus for providing haptic feedback

1. An apparatus comprising:

a first part forming at least part of a case of the apparatus;

a second part forming at least part of a display for the apparatus;

an actuator for generating a feedback force for transmission to the second part; and

a flexible membrane having a first area of contact and a second area of contact, said flexible membrane being attached to the first part at the first area of contact and second part at the second area of contact, said flexible membrane thereby flexibly connecting the first part to the second part,

wherein the second part comprises a front window layer, at least one display layer, and at least one touch interface layer, said front window layer overlying said at least one display layer and said at least one touch interface layer,

wherein the flexible membrane is at least part of one of the at least one display layer and the at least one touch interface layer,

wherein the first part comprises: an outer casing part; and an inner frame part, wherein the first area of contact of the flexible membrane is attached between the outer casing part and the inner frame part, and

wherein the flexible membrane permits transmission of the feedback force generated by the actuator to the second part with negligible damping.

2. The apparatus as claimed in claim 1 , wherein the actuator is at least one of:

a piezo-actuator;

a dynamic eccentric mass actuator;

a moving coil actuator; and

a moving magnet actuator.

3. The apparatus as claimed in claim 1 , wherein at least one of the flexible membrane and the second part is configured to generate audio waves in response to the feedback force.

4. The apparatus as claimed in claim 1 , wherein the flexible membrane comprises at least one of:

an elastomer;

a silicone foil;

a polyethylene terephthalate (PET) polyester film; and

a polycarbonate film.

5. The apparatus as claimed in claim 4 , wherein the flexible membrane has a thickness substantially in the range from 0.025 mm to 0.18 mm.

6. The apparatus as claimed in claim 1 , wherein the flexible membrane is attached to at least one of the first part and the second part by a layer of optically clear adhesive.

7. The apparatus as claimed in claim 1 , wherein the flexible membrane has at least one hole cooperating with an associated pin on the first part so as to locate the flexible membrane and the second part with respect to the first part.

8. The apparatus as claimed in claim 1 , wherein the negligible damping of the feedback force produces a localized haptic feedback to a user.

9. A method of operating an apparatus comprising a first part forming at least part of a case of the apparatus; a second part forming at least part of a display for the apparatus; an actuator for generating a feedback force for transmission to the second part; and a flexible membrane having a first area of contact and a second area of contact, said flexible membrane being attached to the first part at the first area of contact and to the second part at the second area of contact, said flexible membrane thereby flexibly connecting the first part to the second part, wherein the second part comprises a front window layer, at least one display layer, and at least one touch interface layer, said front window layer overlying said at least one display layer and said at least one touch interface layer, wherein the flexible membrane is at least part of one of the at least one display layer and the at least one touch interface layer,

wherein the first part comprises an outer casing part, and an inner frame part, and wherein attaching the first area of contact of the flexible membrane comprises attaching the flexible membrane between the outer casing part and the inner frame part, and

wherein the flexible membrane permits transmission of the feedback force generated by the actuator to the second part with negligible damping, the method comprising transmitting a feedback force from the actuator to the second part.

10. The method as claimed in claim 9 further comprising generating audio waves in response to the feedback force.

11. The method as claimed in claim 9 , further comprising attaching the flexible membrane to at least one of the first part and the second part by a layer of optically clear adhesive.

12. The method as claimed in claim 9 , further comprising locating the flexible membrane and the second part with respect to the first part by providing the flexible membrane with at least one hole cooperating with an associated pin on the first part.

13. The method as claimed in claim 9 , wherein the negligible damping of the feedback force produces a localized haptic feedback to a user.