Display window cover assemblies and electronic devices and methods using the same

1. An electronic device having a display window and comprising:

a composite display window cover assembly disposed in the display window, the composite display window cover assembly including a glass panel and a plastic panel secured to the glass panel and having a main portion and a planar border portion that is substantially coplanar with the main portion and extends laterally beyond a peripheral edge of the glass panel; and

a display device positioned to be viewed through the display window and the composite display window cover assembly, wherein the electronic device includes a housing and the plastic panel is directly secured to the housing at the planar border portion.

2. The electronic device of claim 1 wherein the plastic panel has a thickness of at least about 0.30 mm.

3. The electronic device of claim 1 wherein the plastic panel is formed of a polymeric material having a Young's Modulus of at least about 1.8 GPa.

4. The electronic device of claim 1 wherein the plastic panel is interposed between the glass panel and the display device.

5. The electronic device of claim 1 wherein the plastic panel is laminated to the glass panel.

6. The electronic device of claim 1 wherein the plastic panel is laminated to the glass panel by a layer of adhesive interposed between the plastic panel and the glass panel.

7. The electronic device of claim 1 including a coating disposed on a surface of the plastic panel.

8. The electronic device of claim 1 wherein the glass panel overlies the main portions.

9. The electronic device of claim 1 wherein the plastic panel includes at least one integral mounting feature.

10. The electronic device of claim 9 wherein the at least one integral mounting feature includes at least one of a recess and a hole defined in the plastic panel.

11. The electronic device of claim 9 wherein the at least one integral mounting feature includes at least one of a post and a snap feature extending from the plastic panel.

12. The electronic device of claim 1 wherein the glass panel is formed of chemically hardened glass.

13. The electronic device of claim 1 wherein the plastic panel is formed of at least one of polycarbonate and acrylic.

14. The electronic device of claim 1 wherein the plastic panel is directly adhered to the display device by a layer of adhesive.

15. The electronic device of claim 14 wherein the display device is a liquid crystal display (LCD).

16. The electronic device of claim 1 wherein the plastic panel is directly ultrasonically welded to the housing.

17. The electronic device of claim 1 wherein the electronic device is a wireless communications device.

18. The electronic device of claim 1 wherein the electronic device is a handheld wireless communications device.

19. The method of claim 1 , wherein the planar border portion is configured to underlap the housing.

20. A method for forming an electronic device, the method comprising:

mounting a composite display window cover assembly in a display window of a housing such that the composite display window cover assembly overlies a display unit in the housing and the display unit is viewable through the composite display window cover assembly, wherein the composite display window cover assembly includes a glass panel and a plastic panel secured to the glass panel, wherein the plastic panel has a main portion that is secured to the glass panel and has a planar border portion that is substantially coplanar with the main portion and extends laterally beyond a peripheral edge of the glass panel, and wherein the electronic device includes a housing and the plastic panel is directly secured to the housing at the planar border portion.

21. The method of claim 20 further including laminating the plastic panel to the glass panel.