US5578899A
Expired / Lapsed
US
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Field emission device with internal structure for aligning phosphor pixels with corresponding field emitters
Assignee: Canon Inc
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Filing: 1994-11-21
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Granted: 1996-11-26
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Expires: 2014-11-21
Abstract
Abstract A field emission display device has a faceplate and a backplate. The faceplate includes a faceplate interior side with an active region made of a plurality of phosphor pixel elements; and the backplate has a backplate interior side with a plurality of field emitters. Sidewalls are positioned between the faceplate and the backplate, to form an enclosed sealed envelope between the sidewalls, backplate interior side and the faceplate interior side. At least one spacer wall in the envelope supports the backplate and the faceplate against forces acting in a direction toward the envelope. At least one internal structure fixes and constrains the faceplate and the backplate, and aligns a plurality of phosphor pixels with corresponding field emitters. Additionally, the faceplate can include at least one faceplate fiducial, and the backplate include a corresponding backplate fiducial. The faceplate fiducial is optically aligned with the backplate fiducial. First, the spacer wall is positioned in the wall gripper. The faceplate and backplate fiducials are then optically aligned, and the spacer wall then introduced into the locator. Phosphor pixels are aligned with their corresponding field emitters. There is no need for external fixturing devices in the high temperature bonding and sealing processes of the display.
Inventors
- 👤 Duane A. Haven
- 👤 Chungdee Pong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:10
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/08; H01J29/085; H01J29/86; H01J29/864; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/127; H01J2329/00; H01J2329/86; H01J2329/8625; H01J2329/863; H01J2329/8665
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
127 words
A field emission display device, comprising: a faceplate including a faceplate interior side with an active region made of a plurality of phosphor pixels; a backplate including a backplate interior side with a plurality of field emitters; sidewalls positioned between the faceplate and the backplate to form an enclosed sealed envelope between the sidewalls, backplate interior side and the faceplate interior side; at least one spacer wall in the envelope supporting the backplate and the faceplate against forces acting in a direction toward the envelope; and at least one internal structure that fixes and constrains the faceplate and the backplate, and aligns the plurality of phosphor pixels with corresponding field emitters, the internal structure including a spacer wall receiver formed on the interior side of the faceplate.
Claim 2
Dependent Claim
127 words
A field emission display device, comprising: a faceplate including a faceplate interior side with an active region made of a plurality of phosphor pixels; a backplate including a backplate interior side with a plurality of field emitters; sidewalls positioned between the faceplate and the backplate to form an enclosed sealed envelope between the sidewalls, backplate interior side and the faceplate interior side; at least one spacer wall in the envelope supporting the backplate and the faceplate against forces acting in a direction toward the envelope; and at least one internal structure that fixes and constrains the faceplate and the backplate, and aligns the plurality of phosphor pixels with corresponding field emitters, the internal structure including a spacer wall receiver formed on the interior side of the faceplate.
Claim 3
Dependent Claim
25 words
The field emission display device of claim 1 wherein the spacer wall receiver includes a receiving trench formed on the interior side of the faceplate.
Claim 4
Dependent Claim
21 words
The field emission display device 2, wherein the internal structure includes, a locator formed on the interior side of the backplate.
Claim 5
Dependent Claim
21 words
The field emission display device 2, wherein the internal structure includes, a locator formed on the interior side of the backplate.
Claim 6
Dependent Claim
36 words
The field emission display of claim 3, wherein the spacer wall is mounted at the interior side of the faceplate in the receiving trench, and retained in the locator at the interior side of the backplate.
Claim 7
Dependent Claim
15 words
The field emission device of claim 2, wherein the receiving trench straightens the spacer wall.
Claim 8
Dependent Claim
39 words
The field emission device of claim 2, wherein the receiving trench has a first end that is closer to the faceplate interior side than a second end, and the second end is flared inward relative to the first end.
Claim 9
Dependent Claim
27 words
The field emission device of claim 6, wherein the receiving trench has a width that is the same or smaller than a width of the spacer wall.
Claim 10
Dependent Claim
46 words
The field emission display of claim 1, including a black matrix grid positioned adjacent to the faceplate interior side, the black matrix grid including the wall receiver and a receiving trench that receives the spacer wall and mounts it relative to the plurality of phosphor pixels.
Claim 11
Dependent Claim
18 words
The field emission device of claim 8, wherein the black matrix is made of a photo patternable material.
Claim 12
Dependent Claim
14 words
The field emission device of claim 9, wherein the photo patternable material is polyimide.
Claim 13
Dependent Claim
27 words
The field emission device of claim 8, wherein the spacer wall is substantially optically invisible to a viewer when viewed at an exterior surface of the faceplate.
Claim 14
Dependent Claim
20 words
The field emission device of claim 1, wherein one end of the spacer wall is fixably mounted to the faceplate.
Claim 15
Dependent Claim
28 words
The field emission display device of claim 1, wherein the spacer wall has a different coefficient of thermal expansion than a coefficient of thermal expansion of the faceplate.
Claim 16
Dependent Claim
35 words
The filed emission display device of claim 1, wherein the internal structure includes a spacer wall receiver formed on the interior side of the backplate and a locator at the interior side of the faceplate.
Claim 17
Dependent Claim
118 words
A field emission display device, comprising: a faceplate including a faceplate interior side with an active region made of a plurality of phosphor pixels, and at least one faceplate fiducial; a backplate including a backplate interior side with a plurality of field emitters and at least one backplate fiducial; sidewalls positioned between the faceplate and the backplate to form an enclosed sealed envelope between the sidewalls, backplate interior side and the faceplate interior side; and at least one spacer wall in the envelope supporting the backplate and the faceplate against forces acting in a direction toward the envelope, wherein the faceplate fiducial is optically aligned with the backplate fiducial, and the phosphor pixels with the corresponding field emitters.
Claim 18
Dependent Claim
118 words
A field emission display device, comprising: a faceplate including a faceplate interior side with an active region made of a plurality of phosphor pixels, and at least one faceplate fiducial; a backplate including a backplate interior side with a plurality of field emitters and at least one backplate fiducial; sidewalls positioned between the faceplate and the backplate to form an enclosed sealed envelope between the sidewalls, backplate interior side and the faceplate interior side; and at least one spacer wall in the envelope supporting the backplate and the faceplate against forces acting in a direction toward the envelope, wherein the faceplate fiducial is optically aligned with the backplate fiducial, and the phosphor pixels with the corresponding field emitters.
Claim 19
Dependent Claim
34 words
The field emission display of claim 15, further comprising: at least one internal structure that fixes and constrains the faceplate and the backplate, and aligns the plurality of phosphor pixels with corresponding field emitters.
Claim 20
Dependent Claim
46 words
The field emission display of claim 15, including a black matrix grid positioned adjacent to the faceplate interior side, the black matrix grid including a wall receiver and a receiving trench that receives the spacer wall and mounts it relative to the plurality of phosphor pixels.
Claim 21
Dependent Claim
15 words
The field emission display of claim 15, wherein the black matrix is made of polyimide.
Claim 22
Dependent Claim
17 words
The field emission device of claim 17, wherein the faceplate fiducial is formed on the black matrix.
Claim 23
Dependent Claim
17 words
The field emission device of claim 15, wherein the backplate fiducial is formed on a focusing structure.
Claim 24
Dependent Claim
25 words
The field emission display device of claim 16, wherein the internal structure includes, a spacer wall receiver formed on the interior side of the faceplate.
Claim 25
Dependent Claim
25 words
The field emission display device of claim 21, wherein the spacer wall receiver includes a receiving trench formed on the interior side of the faceplate.
Claim 26
Dependent Claim
23 words
The field emission display device of claim 22, wherein the internal structure includes, a locator formed on the interior side of the backplate.
Claim 27
Dependent Claim
36 words
The field emission display of claim 23, wherein the spacer wall is mounted at the interior side of the faceplate in the receiving trench, and retained in the locator at the interior side of the backplate.
Claim 28
Dependent Claim
20 words
The field emission device of claim 22, wherein one end of the spacer wall is fixably mounted to the faceplate.
Claim 29
Dependent Claim
15 words
The field emission device of claim 22, wherein the receiving trench straightens the spacer wall.
Claim 30
Dependent Claim
27 words
The field emission device of claim 16, wherein the spacer wall has a different coefficient of thermal expansion than a coefficient of thermal expansion of the faceplate.
Claim 31
Dependent Claim
27 words
The field emission device of claim 22, wherein the receiving trench has a width that is the same or smaller than a width of the spacer wall.
References Cited (Backward Citations)
US4020381A
Cited
US4174523A
Cited
US4163949A
Cited
US4618801A
Cited
US4622492A
Cited
US4577133A
Cited
US4900981A
Cited
US4857799A
Cited
US4887000A
Cited
US5063327A
Cited
US5003219A
Cited
US5315207A
Cited
US5227691A
Cited
US5160871A
Cited
EP0436997A1
Cited
US5170100A
Cited
EP0464938A1
Cited
EP0496450A1
Cited
US5229691A
Cited
WO1993018536A1
Cited
EP0580244A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-26 | 2000-05-27 | 2000-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-26 | 2004-05-27 | 2004-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-26 | 2008-05-27 | 2008-11-26 | $7700.00 | Window Closed / Lapsed |