Multi-compartment getter-containing flat-panel device

• US 6,194,830 B1
• Filed: 02/25/1999
• Issued: 02/27/2001
• Est. Priority Date: 12/12/1996
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.), DARPA
• Original Assignee: Candescent Technologies Corporation (Canon Inc.)
• Inventors: Maslennikov, Igor L., Cho, Steven T., Curtin, Christopher J., Conte, Alfred S.
• Primary Examiner(s): Patel, Nimeshkumar D.
• Assistant Examiner(s): HOPPER, TODD R
• Application Number:
  US09/258,247
• Time in Patent Office: 733 Days
• Field of Search: 313/553, 313/549, 313/561, 313/551, 313/562, 313/563, 313/481, 313/422, 313/495
• US Class Current: 313/553
• CPC Class Codes: H01J 17/24 Means for absorbing or adsorbing gas, e.g. by gettering
• CPC Class Codes: H01J 2209/385 Gettering
• CPC Class Codes: H01J 2329/00 Electron emission display panels, e.g. field emission display panels
• CPC Class Codes: H01J 29/94 Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering exhausting, degassing, gettering of electric discharge tubes in general H01J9/38
• CPC Class Codes: H01J 9/385 Exhausting vessels

Abstract

A getter (74) is situated in an auxiliary compartment (72) of a hollow structure (40-46 and 76) having a larger main compartment (70). The auxiliary compartment is situated outside the main compartment and is connected to the main compartment so that the two compartments reach largely the same steady-state compartment pressure. The getter is activated by directing light energy locally through part of the hollow structure and onto the getter. The light energy is typically furnished by a laser beam (60). The getter, typically of the non-evaporable type, is usually inserted as a single piece of gettering material into the auxiliary compartment. The getter normally can be activated/re-activated multiple times in this manner, typically during sealing of different parts of the structure together.

Claims

1. A flat-panel device comprising:

a main compartment formed with a first plate structure and a second plate structure situated opposite to, and coupled to, the first plate structure;

a plurality of spacer walls extending generally parallel to one another between the plate structures;

an auxiliary compartment (a) formed with an auxiliary wall coupled to the first plate structure and (b) connected pressure-wise to the main compartment through a plurality of openings in the first plate structure so that the two compartments reach largely equal steady-state compartment pressures; and

a getter situated in the auxiliary compartment, the getter comprising a getter strip extending generally perpendicular to the spacer walls.

2. A device as in claim 1 wherein:

the first plate structure is controlled to selectively emit electrons; and

the second plate structure emits light to produce an image in response to electrons received from the first plate structure.

3. A device as in claim 1 wherein the main compartment is also formed with a generally annular outer wall through which the plate structures are coupled to each other.

4. A flat-panel device comprising:

a main compartment formed with a first plate structure and a second plate structure situated opposite to, and coupled to, the first plate structure;

an auxiliary compartment (a) formed with an auxiliary wall coupled to the first plate structure and (b) connected pressure-wise to the main compartment through at least one opening through the first plate structure so that the two compartments reach largely equal steady-state compartment pressures;

a getter situated in the auxiliary compartment; and

additional component material situated over the first plate structure outside the compartments, the additional component material comprising control circuitry, the auxiliary wall not extending significantly further away from the first plate structure than the additional component material.

5. A device as in claim 4 wherein:

the first plate structure is controlled to selectively emit electrons; and

the second plate structure emits light to produce an image in response to electrons received from the first plate structure.

6. A device as in claim 4 wherein the main compartment is also formed with a generally annular outer wall through which the plate structures are coupled to each other.

7. A device as in claim 4 wherein the control circuitry and the auxiliary wall extend to approximately the same distance away from the first plate structure.

8. A device as in claim 4 further including a pump-out port connected pressure wise to the auxiliary compartment.

9. A device as in claim 8 wherein the pump-out port extends approximately parallel to the first plate structure.

10. A device as in claim 4 wherein the getter is situated within the auxiliary compartment at a location suitable for being activated by light energy transferred locally through the auxiliary wall.

11. A flat-panel device comprising:

a main compartment comprising a first plate structure, a second plate structure, and a generally annular outer wall that extends between the plate structures;

an auxiliary compartment situated over the first plate structure outside the main compartment and connected pressure-wise to the main compartment so that the two compartments reach largely equal steady-state compartment pressures;

a getter situated in the auxiliary compartment; and

control circuitry situated over the first plate structure outside the compartments, the auxiliary compartment not extending significantly further away from the first plate structure than the control circuitry.

12. A device as in claim 11 wherein the compartments are connected together through at least one opening in the first plate structure.

13. A device as in claim 11 wherein the getter is situated within the auxiliary compartment at a location suitable for being activated by light energy transferred locally through a wall of the auxiliary compartment.

14. A device as in claim 11 further including a plurality of spacer walls extending generally parallel to one another between the plate structures and extending generally perpendicular to the getter.

15. A device as in claim 11 further including getter support means for supporting the getter and thermally insulating it from the compartments.

16. A device as in claim 11 wherein the getter comprises a piece of non-evaporable gettering material.

17. A device as in claim 11 further including a pump-out port connected pressure-wise to the auxiliary compartment.

18. A device as in claim 17 wherein the pump-out port extends approximately parallel to the first plate structure.

19. A device as in claim 18 wherein the pump-out port, when closed, does not extend significantly laterally beyond the first plate structure.

20. A device as in claim 11 wherein the compartments, getter, and control circuitry are components of a flat-panel display for which the second plate structure contains a faceplate on which an image produced by the flat-panel display is visible.

21. A device as in claim 20 wherein:

the first plate structure contains multiple electron-emissive elements; and

the second plate structure contains multiple light-emissive elements that emit light upon being struck by electrons emitted from the electron-emissive elements.

29. A device as in claim 20 wherein:

the first plate structure contains multiple electron-emissive elements; and

the second plate structure contains multiple light-emissive elements that emit light upon being struck by electrons emitted from the electron-emissive elements.

22. A flat-panel device comprising:

a main compartment formed with a first plate structure, a second plate structure, and a generally annular outer wall that extends between the plate structures;

an auxiliary compartment situated outside the main compartment, the auxiliary compartment formed with an auxiliary wall that contacts the first plate structure outside the main compartment, extends away from the first plate structure and main compartment, bends back towards the second plate structure, and contacts the second plate structure outside the main compartment, the auxiliary compartment connected pressure-wise to the main compartment so that the two compartments reach largely equal steady-state compartment pressures;

a getter situated in the auxiliary compartment; and

a pump-out port connected directly to the auxiliary compartment, extending approximately parallel to the first plate structure, and, when closed, not extending significantly laterally beyond the first plate structure.

23. A device as in claim 22 wherein the pump-out port, when closed, does not extend significantly further away from the first plate structure than the auxiliary wall.

24. A device as in claim 22 wherein the compartments are connected together through at least one opening in the outer wall.

25. A device as in claim 22 further including control circuitry situated over the first plate structure outside the compartments, the auxiliary wall not extending significantly further away from the first plate structure than the control circuitry.

26. A device as in claim 22 wherein the getter is situated within the auxiliary compartment at a location suitable for being activated by light energy transferred locally through the auxiliary wall.

27. A device as in claim 22 further including a plurality of spacer walls extending generally parallel to one another between the plate structures and extending generally perpendicular to the getter.

28. A device as in claim 22 wherein the plate structures, walls, getter, and pump-out port are components of a flat-panel display for which the second plate structure contains a faceplate on which an image produced by the flat-panel display is visible.

30. A flat-panel device comprising:

a main compartment formed with a first plate structure and a second plate structure situated opposite to, and coupled to, the first plate structure;

an auxiliary compartment (a) formed with an auxiliary wall coupled to the first plate structure and (b) connected pressure-wise to the main compartment through at least one opening through the first plate structure so that the two compartments reach largely equal steady-state compartment pressures;

a getter situated in the auxiliary compartment;

a pump-out port connected pressure-wise to the auxiliary compartment, the pump-out port extending approximately parallel to the first plate structure; and

additional component material situated over the first plate structure outside the compartments, the auxiliary wall not extending significantly further away from the first plate structure than the additional component material.

31. A device as in claim 30 wherein:

the first plate structure is controlled to selectively emit electrons; and

the second plate structure emits light to produce an image in response to electrons received from the first plate structure.

32. A device as in claim 30 wherein the main compartment is also formed with a generally annular outer wall through which the plate structures are coupled to each other.

33. A device as in claim 30 wherein the getter is situated within the auxiliary compartment at a location suitable for being activated by light energy transferred locally through the auxiliary wall.

34. A flat-panel device comprising:

a main compartment formed with a first plate structure and a second plate structure situated opposite to, and coupled to, the first plate structure;

an auxiliary compartment (a) formed with an auxiliary wall coupled to the first plate structure and (b) connected pressure-wise to the main compartment through at least one opening through the first plate structure so that the two compartments reach largely equal steady-state compartment pressures;

a getter situated in the auxiliary compartment at a location suitable for being activated by light energy transformed locally through the auxiliary wall; and

additional component material situated over the first plate structure outside the compartments, the auxiliary wall not extending significantly further away from the first plate structure than the additional component material.

35. A device as in claim 34 wherein:

the first plate structure is controlled to selectively emit electrons; and

the second plate structure emits light to produce an image in response to electrons received from the first plate structure.

36. A device as in claim 34 wherein the main compartment is also formed with a generally annular outer wall through which the plate structures are coupled to each other.