Touch sensitive display with acoustic isolation

• US 9,513,746 B2
• Filed: 07/31/2013
• Issued: 12/06/2016
• Est. Priority Date: 07/31/2012
• Status: Active Grant

• Current Assignee: Elo Touch Solutions, Inc.
• Original Assignee: Elo Touch Solutions, Inc.
• Inventors: Estve, Simon, Schevin, Olivier
• Primary Examiner(s): Spar, Ilana
• Assistant Examiner(s): Rayan, Mihir K
• Application Number:
  US13/955,802
• Publication Number:
  US 20140035881A1
• Time in Patent Office: 1,224 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0433 in which the acoustic waves are either generated by a movable member and propagated within a surface layer or propagated within a surface layer and captured by a movable member
• CPC Class Codes: G06F 3/0436 in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate

Abstract

Provided is a touch sensitive display, for integration into an electronic device configured to function in a predetermined temperature range, comprising a display panel and an acoustic isolating means. The acoustic isolating means is configured and arranged such that it presents a damping ratio of 5% or less with a variation of this damping ratio of 2 percentage points or less in the predetermined temperature range. Also provided is a touch sensitive display comprising a display panel and an acoustic isolating means. The acoustic isolating means comprises an elastic material in a first region on the front side of the display panel, with the front main side of the display panel being the displaying side, and an elastic material in a second region on the back side of the display panel and a compression controlling means for compressing the first and/or second region by a predetermined amount.

Claims

1. A touch sensitive display for integration into an electronic device configured to function in a predetermined temperature range, wherein the touch sensitive display comprises:

a display panel,

at least one acoustic wave sensing component, and

an acoustic isolating component wherein the acoustic isolating component is configured and arranged such that it presents a damping ratio of 5% or less, with a variation of this damping ratio of 2 percentage points or less in the predetermined temperature range, and wherein the acoustic isolating component is further configured to provide mechanical stiffening of the display panel.

2. The touch sensitive display according to claim 1, wherein the acoustic isolating component is configured and arranged such that its dynamic stiffness has a variation of 2% or less in the predetermined temperature range.

3. The touch sensitive display according to claim 1, wherein the predetermined temperature range is at least from 0°

C. up to 50°

C.

4. The touch sensitive display according to claim 1,

wherein the acoustic isolating component comprises:

an elastic material in a first region on the front side of the display panel, with the front side of the display panel being the displaying side,

an elastic material in a second region on the back side of the display panel, and wherein the elastic materials in the first region and second region are further configured to provide mechanical stiffening of the display panel, and

a compression controlling component for compressing at least one of the first and second region by a predetermined amount.

5. The touch sensitive display according to claim 4, wherein the compression controlling component is a frame attached to the acoustic isolating component in the first or second region and extending at least partially beyond the edge of the display panel.

6. The touch sensitive display according to claim 5, wherein the compression controlling component is part of a housing shell into which the display panel with the acoustic isolating component and the acoustic wave sensing component is positioned such that the first and second region get compressed in a predetermined way.

7. The touch sensitive display according to claim 6, wherein the acoustic isolating component in the first region and in the second region is compressed between the housing shell and the display panel respectively without being attached to the display panel.

8. The touch sensitive display according to claim 4, wherein the acoustic isolating component comprises one or more molded parts into which the display panel is frictionally engaged.

9. The touch sensitive display according to claim 4, wherein the size of the acoustic wave sensing component essentially at least matches the size of the back side of the display panel, with the front side of the display panel being the displaying side, and comprises one or more recess regions or holes for accommodating the at least one acoustic wave sensing component which is/are in contact with the back side of the display panel.

10. The touch sensitive display according to claim 1, wherein the acoustic isolating component comprises a fixing component configured to the display panel to the acoustic isolating component.

11. The touch sensitive display according to claim 10, wherein the fixing component is one of a hook, a clamp, or a bracket, and wherein the fixing component is provided at at least one of an edge and a corner of the display panel.

12. The touch sensitive display according to claim 1, wherein the acoustic isolating component comprises a plurality of bumps on the side facing the display panel.

13. The touch sensitive display according to claim 12, wherein the bumps touch the display panel at least in its edge region.

14. The touch sensitive display according to claim 1, wherein the acoustic isolating component is at least partially made out of a silicone material.

15. The touch sensitive display according to claim 1, wherein the acoustic isolating component comprises one or more regions with a two or three dimensional spacer textile.

16. The touch sensitive display according to claim 1, wherein the acoustic isolating component comprises stiffening elements made out of any one of a metal, aluminum, a polycarbonate material, a Polyether ether ketone (PEEK) material, or a combination thereof.

17. The touch sensitive display according to claim 1, further comprising one or more spacers attached to or incorporated into the acoustic isolating component with one extremity of the one or more spacer being flush aligned with the front side of the display panel or protruding perpendicular to the front side of the display panel by a predetermined amount.

18. The touch sensitive display according to claim 17, wherein the one or more spacer is made out of any one of a metal, a polycarbonate material, a Polyether ether ketone (PEEK) material, or a combination thereof.

19. An electronic device comprising:

a touch sensitive display according to claim 1,

a printed circuit board, and

a cover frame fixed to the printed circuit board and enclosing at least the display panel and the acoustic isolating component.

20. The electronic device according to claim 19, wherein the cover frame is in contact with the frame of a compression controlling component to thereby compress a first region and a second region of the acoustic isolating component by the predetermined amount.

21. The electronic device according to claim 19, wherein the touch sensitive display further comprises one or more spacers attached to or incorporated into the acoustic isolating component, with one extremity of the one more spacer being flush aligned with the front side of the display panel or protruding perpendicular to the front side of the display panel by a predetermined amount, and wherein the cover frame touches the extremity/extremities of the one or more spacer.