Laminated display window and device incorporating same
A laminated window assembly for a device, such as a handheld electronic device (e.g., a media player or mobile telephone), includes a window layer that preferably is glass, and a larger, substantially transparent lip-forming layer to which it is laminated, preferably by a substantially clear adhesive. Additional adhesive preferably is placed at at least portions of the edge of the window layer adjacent the lip-forming layer, especially at the corners, to resist delamination. Holes preferably are formed in the lip—e.g., at the corners—to resist the lip-forming layer peeling apart from the window layer forming layer. The holes preferably make up at most about 33% of the periphery of the window layer.
1. A laminated window assembly for a device, said assembly comprising:
a window layer comprising a first substantially transparent material and having a periphery;
a lip-forming layer larger than said window layer and comprising a second substantially transparent material, said lip-forming layer extending beyond said window layer to form a lip for engaging said device;
a substantially transparent bonding layer between said window layer and said lip-forming layer; and
an adhesive bead bonding said periphery of said window layer to said lip-forming layer along at least one portion of said periphery.
2. The laminated window assembly of claim 1 wherein said first substantially transparent material is glass.
3. The laminated window assembly of claim 1 wherein said second substantially transparent material is a plastic material.
4. The laminated window assembly of claim 3 wherein said second substantially transparent material is polycarbonate.
5. The laminated window assembly of claim 1 wherein said at least one portion of said periphery comprises at least one corner of said periphery.
6. The laminated window assembly of claim 5 wherein said at least one corner of said periphery comprises all corners of said periphery.
7. The laminated window assembly of claim 1 wherein said at least one portion of said periphery comprises all of said periphery.
8. The laminated window assembly of claim 7 wherein said lip-forming layer has a channel therein for placement of said adhesive bead.
9. The laminated window assembly of claim 8 wherein said channel has a rectangular cross section.
10. The laminated window assembly of claim 8 wherein said channel has an arcuate cross section.
11. The laminated window assembly of claim 1 wherein said lip-forming layer has a channel therein at least in said at least one portion of said periphery for placement of said adhesive bead.
12. The laminated window assembly of claim 11 wherein said channel has a rectangular cross section.
13. The laminated window assembly of claim 11 wherein said channel has an arcuate cross section.
14. The laminated window assembly of claim 1 wherein said lip has at least one hole therein adjacent said periphery of said window layer, other than at said at least one portion of said periphery, for strain relief, to reduce peeling forces that reach said substantially transparent bonding layer when said lip is flexed.
15. The laminated window assembly of claim 14 wherein said lip has a plurality of said holes.
16. The laminated window assembly of claim 15 wherein said lip has a respective hole adjacent each corner of said periphery of said window layer.
17. The laminated window assembly of claim 15 wherein said plurality of holes totals at most about 33% of said periphery.
18. A device comprising:
a casing, said casing having a face portion, said face portion having a window opening therein; and
a laminated window assembly, said laminated window assembly comprising:
a window layer comprising a first substantially transparent material and having a periphery, said window layer being substantially identical in size and shape to said opening;
a lip-forming layer larger than said window layer and comprising a second substantially transparent material, said lip-forming layer extending beyond said window layer to form a lip for engaging said device;
a substantially transparent bonding layer between said window layer and said lip-forming layer; and
an adhesive bead bonding said periphery of said window layer to said lip-forming layer along at least one portion of said periphery.
19. The device of claim 18 wherein said first substantially transparent material is glass.
20. The device of claim 18 wherein said second substantially transparent material is a plastic material.
21. The device of claim 20 wherein said second substantially transparent material is polycarbonate.
22. The device of claim 18 wherein said at least one portion of said periphery comprises at least one corner of said periphery.
23. The device of claim 22 wherein said at least one corner of said periphery comprises all corners of said periphery.
24. The device of claim 18 wherein said at least one portion of said periphery comprises all of said periphery.
25. The device of claim 24 wherein said lip-forming layer has a channel therein for placement of said adhesive bead.
26. The device of claim 25 wherein said channel has a rectangular cross section.
27. The device of claim 25 wherein said channel has an arcuate cross section.
28. The device of claim 24 wherein said face portion has a channel therein for placement of said adhesive bead.
29. The device of claim 28 wherein said channel has a rectangular cross section.
30. The device of claim 28 wherein said channel is formed by a chamfer in said face portion.
31. The device of claim 18 wherein said lip-forming layer has a channel therein at least in said at least one portion of said periphery for placement of said adhesive bead.
32. The device of claim 31 wherein said channel has a rectangular cross section.
33. The device of claim 31 wherein said channel has an arcuate cross section.
34. The device of claim 18 wherein said face portion has a channel therein for placement of said adhesive bead.
35. The device of claim 34 wherein said channel has a rectangular cross section.
36. The device of claim 34 wherein said channel is formed by a chamfer in said face portion.
37. The device of claim 18 wherein said lip has at least one hole therein adjacent said periphery of said window layer, other than at said at least one portion of said periphery, for strain relief, to reduce peeling forces that reach said substantially transparent bonding layer when said lip is flexed.
38. The device of claim 37 wherein said lip has a plurality of said holes.
39. The device of claim 38 wherein said lip has a respective hole adjacent each corner of said periphery of said window layer.
40. The device of claim 38 wherein said plurality of holes totals at most about 33% of said periphery.
41. A laminated window assembly for a device, said assembly comprising:
a window layer comprising a first substantially transparent material and having a periphery;
a lip-forming layer larger than said window layer and comprising a second substantially transparent material, said lip-forming layer extending beyond said window layer to form a lip for engaging said device; and
a substantially transparent bonding layer between said window layer and said lip-forming layer; wherein:
said lip-forming layer has at least one hole therein adjacent said periphery of said window layer for strain relief, to reduce peeling forces that reach said substantially transparent bonding layer when said lip is flexed.
42. The laminated window assembly of claim 41 wherein said lip has a plurality of said holes.
43. The laminated window assembly of claim 42 wherein said lip has a respective hole adjacent each corner of said periphery of said window layer.
44. The laminated window assembly of claim 42 wherein said plurality of holes totals at most about 33% of said periphery.
45. A device comprising:
a casing, said casing having a face portion, said face portion having a window opening therein; and
a laminated window assembly, said laminated window assembly comprising:
a window layer comprising a first substantially transparent material and having a periphery, said window layer being substantially identical in size and shape to said opening, and having a periphery;
a lip-forming layer larger than said window layer and comprising a second substantially transparent material, said lip-forming layer extending beyond said window layer to form a lip for engaging said device; and
a substantially transparent bonding layer between said window layer and said lip-forming layer; wherein:
said lip has at least one hole therein adjacent said periphery of said window layer for strain relief, to reduce peeling forces that reach said substantially transparent bonding layer when said lip is flexed.
46. The device of claim 45 wherein said lip has a plurality of said holes.
47. The device of claim 46 wherein said lip has a respective hole adjacent each corner of said periphery of said window layer.
48. The device of claim 46 wherein said plurality of holes totals at most about 33% of said periphery.