Mobile electronic device comprising a sapphire cover plate having a low level of inclusions

1. An electronic device comprising

at least one display element having a display surface; and

a cover plate for the at least one display element having at least one transparent display region, the cover plate comprising at least one sapphire layer having no inclusions with a size greater than 0.05 mm.

2. The electronic device of claim 1 , wherein the sapphire layer has no inclusions with a length greater than 0.05 mm.

3. The electronic device of claim 1 , wherein the sapphire layer has no inclusions with a diameter greater than 0.05 mm.

4. The electronic device of claim 1 , wherein the sapphire layer has no inter-inclusion distance less than 2.0 mm.

5. The electronic device of claim 1 , wherein the sapphire layer has a total area of inclusions of less than 2.0 mm 2 in a 2.5 cm 2 area.

6. The electronic device of claim 1 , wherein the cover plate is affixed to the display surface.

7. The electronic device of claim 1 , wherein the cover plate is a protective layer removably positioned on top of the display surface.

8. The electronic device of claim 1 , wherein the sapphire layer comprises sapphire solidified in a crystal growth furnace.

9. The electronic device of claim 8 , where the crystal growth furnace is a heat exchanger method furnace.

10. The electronic device of claim 1 , wherein the cover plate has thickness between about 0.3 and 3.0.

11. The electronic device of claim 1 , wherein the cover plate has thickness between about 0.4 and 2.5.

12. The electronic device of claim 1 , wherein the cover plate has thickness between about 0.5 and 1.0.

13. The electronic device of claim 1 , wherein the cover plate further comprises an exterior anti-reflective layer.

14. The electronic device, of claim 1 , wherein the electronic device is an electronic media player, a mobile telephone, a personal data assistant, a pager, a tablet, a laptop computer, or an electronic notebook.