Claims
- 1. A field emission display device comprising:a) a faceplate; b) a backplate coupled to said faceplate; c) a focus structure disposed between said faceplate and said backplate; and d) a contaminant prevention structure disposed covering said focus structure, said contaminant prevention structure preventing thermal outgassing and electron desorption of contaminants from said focus structure.
- 2. The field emission display device of claim 1 wherein said focus structure is comprised of polyimide.
- 3. The field emission display device of claim 1 wherein said contaminant prevention structure is comprised of a layer of substantially non-porous material.
- 4. The field emission display device of claim 1 wherein said contaminant prevention structure is comprised of a plurality of layers of substantially non-porous material.
- 5. The field emission display device of claim 1 wherein said contaminant prevention structure is comprised of a layer of substantially porous material.
- 6. The field emission display device of claim 1 wherein said contaminant prevention structure is comprised of a plurality of layers of substantially porous material.
- 7. The field emission display device of claim 1 wherein said contaminant prevention structure is comprised of:a layer of substantially porous material; and a layer of substantially non-porous material coupled to said layer of substantially porous material.
- 8. The field emission display device of claim 1 further comprising:e) a conductive coating disposed covering said contaminant prevention structure.
- 9. The field emission display device of claim 1 wherein said contaminant prevention structure is disposed in sub-pixel regions of said field emission display device.
- 10. The field emission display device of claim 9 wherein said contaminant prevention structure includes a dye material such that display contrast is improved by the reduction of reflected ambient light.
- 11. The field emission display device of claim 10 wherein said contaminant prevention structure is comprised of silicon oxide doped with said dye material.
- 12. The field emission display device of claim 1 wherein said contaminant prevention structure is comprised of a layer of substantially porous material impregnated with other material.
- 13. The field emission display device of claim 1 wherein said contaminant prevention structure is comprised of a layer of substantially porous material impregnated with substantially non-porous material.
- 14. The field emission display device of claim 13 further comprising:e) a conductive coating disposed covering said contaminant prevention structure.
- 15. The field emission display device of claim 14 wherein said contaminant prevention structure is disposed in sub-pixel regions of said field emission display device.
Parent Case Info
This is a divisional of application(s) Ser. No. 09/087,785 filed on May 29, 1998 now U.S. Pat. No. 6,215,241 which designated in the U.S.
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