FIELD EMISSION DEVICE

• US 20080007153A1
• Filed: 11/30/2006
• Published: 01/10/2008
• Est. Priority Date: 07/05/2006
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Original Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Inventors: FAN, SHOU-SHAN, TANG, JIE, LIU, LIANG, YANG, YUAN-CHAO
• Granted Patent: US 7,615,919 B2
• Time in Patent Office: Days
• US Class Current: 313/496
• CPC Class Codes: H01J 31/12 with luminescent screen
• CPC Class Codes: H01J 63/06 Lamps with luminescent screen excited by the ray or stream

Abstract

A field emission device (10) includes a sealed container (12) with a first light-permeable portion (120) and an opposite second light-permeable portion (122). A first phosphor layer (14) is formed on the first light-permeable portion. A first light-permeable anode (16) is formed on the first light-permeable portion. A second phosphor layer (18) is formed on the second light-permeable portion. A second light-permeable anode (20) is formed on the second light-permeable portion. A shielding barrel (22) is disposed within the container and electrically connected to at least one cathode electrode (25, 26). The shielding barrel has opposite open ends facing toward the first and the second light-permeable portions respectively. The shielding barrel has an inner surface, and a slurry layer (24) containing conductive nano material is formed on the inner surface of the shielding barrel.

Claims

1. A field emission device, comprising:

a sealed container with a first light-permeable portion and an opposite second light-permeable portion;

a first phosphor layer formed on the first light-permeable portion;

a first light-permeable anode formed on the first light-permeable portion;

a second phosphor layer formed on the second light-permeable portion;

a second light-permeable anode formed on the second light-permeable portion;

a shielding barrel disposed within the container and electrically connected to at least one cathode electrode, the shielding barrel having opposite open ends facing toward the first and the second light-permeable portions respectively, the shielding barrel having an inner surface; and

a slurry layer containing conductive nano material, the slurry layer being formed on the inner surface of the shielding barrel.

2. The field emission device as claimed in claim 1, wherein the sealed container is a vacuum container.

3. The field emission device as claimed in claim 1, wherein the sealed container is a hollow cylinder.

4. The field emission device as claimed in claim 1, wherein the sealed container is comprised of a material selected from the group consisting of quartz, glass and any combination thereof.

5. The field emission device as claimed in claim 1, wherein the first and the second light-permeable portion is flat, spherical, or aspherical in shape.

6. The field emission device as claimed in claim 1, wherein the first and the second light-permeable anodes are aluminum layers.

7. The field emission device as claimed in claim 1, wherein the conductive nano material is selected from the group consisting of carbon nanotubes, carbon nano-sticks, carbon nano-yarns, Buckminster-fullerene, and carbon nano-particles.

8. The field emission device as claimed in claim 1, wherein the conductive nano material is selected from the group consisting of nanotube, nano-stick, nano-yarn, nano-particle of conductive metal and semiconductor.

9. The field emission device as claimed in claim 1, further comprising a getter arranged around the at least one cathode electrode.

10. The field emission device as claimed in claim 1, wherein the at least one cathode electrode is arranged between the first and second light-permeable anode.

11. The field emission device as claimed in claim 1, wherein the at least one cathode electrode surrounds the shielding barrel.

12. The field emission device as claimed in claim 1, wherein the first phosphor layer is sandwiched between the first light-permeable portion and the first light-permeable anode.

13. The field emission device as claimed in claim 1, wherein central axis of the container is perpendicular to the first and the second light-permeable portions.

14. The field emission device as claimed in claim 1, wherein the inner surface of the shielding barrel has an intermediate region with the slurry layer provided thereon and opposite lateral bare regions free of the slurry layer provided thereon.