Protected substrate structure for a field emission display device

• US 6,853,129 B1
• Filed: 04/11/2003
• Issued: 02/08/2005
• Est. Priority Date: 07/28/2000
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Candescent Intellectual Property Services, Inc., Candescent Technologies Corporation (Canon Inc.)
• Inventors: Cummings, William J., Porter, John D., Pei, Shiyou, Learn, Arthur J., Fahlen, Theodore S., Mackey, Bob L., Sahlstrom, Kris E.
• Primary Examiner(s): WILLIAMS, JOSEPH L
• Application Number:
  US10/412,196
• Time in Patent Office: 669 Days
• Field of Search: 313495-497, 313/309, 313/336, 313/351, 313/355
• US Class Current: 313/495
• CPC Class Codes: H01J 1/304 Field-emissive cathodes
• CPC Class Codes: H01J 2201/02 Arrangements for eliminating deleterious effects
• CPC Class Codes: H01J 2211/36 Spacers, barriers, ribs, partitions or the like
• CPC Class Codes: H01J 2329/00 Electron emission display panels, e.g. field emission display panels
• CPC Class Codes: H01J 29/06 Screens for shielding; Masks interposed in the electron stream
• CPC Class Codes: H01J 29/085 Anode plates, e.g. for screens of flat panel displays

Abstract

A protected faceplate structure of a field emission display device is disclosed in one embodiment. Specifically, in one embodiment, the present invention recites a faceplate of a field emission display device wherein the faceplate of the field emission display device is adapted to have phosphor containing areas disposed above one side thereof. The present embodiment is further comprised of a barrier layer which is disposed over the one side of said faceplate which is adapted to have phosphor containing areas disposed thereabove. The barrier layer of the present embodiment is adapted to prevent degradation of the faceplate. Specifically, the barrier layer of the present embodiment is adapted to prevent degradation of the faceplate due to electron bombardment by electrons directed towards the phosphor containing areas.

Claims

1. A protected faceplate structure of a field emission display device, said protected faceplate structure comprising:

a) a faceplate of a field emission display device, said faceplate adapted to have phosphor containing areas disposed above one side thereof; and

b) a barrier layer comprised of an oxide of the lanthanide series, said barrier layer disposed over said one side of said faceplate, said barrier layer adapted to prevent degradation of said faceplate due to electron bombardment by electrons directed towards said phosphor containing areas, wherein said barrier layer includes a selectively light absorbing component.

2. The protected faceplate structure of a field emission display device of claim 1, wherein said faceplate is comprised of a high-sodium glass substrate.

3. The protected faceplate structure of a field emission display device of claim 1, wherein said barrier layer has a thickness sufficient to prevent substantial penetration of said electrons through said barrier layer such that said electrons do not impinge said faceplate.

4. The protected faceplate structure of a field emission display device of claim 1, wherein said barrier layer is selected from the group consisting of:

Y₂O₃, La₂O₃, CeO₂, Pr₄O₁₁, Nd₂O₃, Pm₂O₃, Sm₂O₃, EuO₂, Gd₂O₃, TbO₂, Dy₂O₃, Ho₂O₃, Er₂O₃, Tm₂O₃, Yb₂O₃, Yb₂O₃ and Lu₂O₃, and their mixtures.

5. The protected faceplate structure of a field emission display device of claim 4, wherein said barrier layer has a thickness of approximately 25 nanometers.

6. The protected faceplate structure of a field emission display device of claim 1, wherein said barrier layer prevents the migration of contaminants from said faceplate into said field emission display device.

7. The protected faceplate structure of a field emission display device of claim 2, wherein said barrier layer prevents the migration of sodium from said faceplate into said field emission display device.

8. The protected faceplate structure of a field emission display device of claim 1, wherein said barrier layer is electrically conductive.

9. The protected faceplate structure of a field emission display device of claim 1, wherein said selectively light absorbing component is selected from the group consisting of dyes and pigments.

10. The protected faceplate structure of a field emission display device of claim 1, wherein each subpixel of said faceplate includes a different selectively light absorbing component.

11. The protected faceplate structure of a field emission display device of claim 1, wherein said barrier layer is selected from the group consisting of:

high density oxides, nitride, Gd₂O₃, Yb₂O₃, HfO₂, GdN_x, HfN_x, and their mixtures.

12. The protected faceplate structure of a field emission display device of claim 11, wherein said barrier layer has a thickness of approximately 25 nanometers.