Patent JPS5981258A successfully refreshed from Google Patents.
US5686790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat panel device with ceramic backplate
Assignee: Canon Inc
•
Filing: 1993-06-22
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Granted: 1997-11-11
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Expires: 2013-06-22
Abstract
Abstract According to the invention, a flat panel device includes a faceplate, a backplate made of a co-fired ceramic substrate and attached to the faceplate to form a sealed enclosure, and structure for producing light. The faceplate includes an active region. The light producing structure is divided into a matrix of "display elements," or a plurality of "light producing elements." Driver circuitry is formed on or attached to a surface of the backplate. The driver circuitry is connected to the display elements or light producing elements by electrically conductive vias formed entirely or partially through or within the ceramic substrate, and electrically conductive traces formed within or on one or more surfaces of the ceramic substrate. Each of the display elements or light producing elements is controlled by the driver circuitry to cause light emission at a corresponding pixel or pixels of the faceplate active region.
Inventors
- 👤 Christopher J. Curtin
- 👤 Anthony P. Schmid
- 👤 Paul A. Lovoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:32
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133617; G02F1/136; G02F1/1362; H; H01; H01J; H01J29/00; H01J29/86; H01J29/863; H01J5/00; H01J5/02; H01J5/04; H01J61/00; H01J61/02; H01J61/30; H01J61/302; H01J63/00; H01J63/06; H01J9/00; H01J9/24; H01J9/241; G02F1/133302; G02F1/133374; H01J2329/00
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
57 words
A flat panel device comprising: a backplate which comprises a plurality of co-fired layers, including a ceramic first layer, the ceramic being zero shrinkage tolerance ceramic having a firing shrinkage of no more than 0.5%; a faceplate connected to the backplate to form a sealed enclosure; means for producing light; and means for controlling the light-producing means.
Claim 2
Dependent Claim
57 words
A flat panel device comprising: a backplate which comprises a plurality of co-fired layers, including a ceramic first layer, the ceramic being zero shrinkage tolerance ceramic having a firing shrinkage of no more than 0.5%; a faceplate connected to the backplate to form a sealed enclosure; means for producing light; and means for controlling the light-producing means.
Claim 3
Dependent Claim
20 words
A flat panel device as in claim 1 wherein the enclosure is maintained at a pressure below standard atmosphenic pressure.
Claim 4
Dependent Claim
24 words
A flat panel device as in claim 2 wherein the pressure in the enclosure is substantially at vacuum level compared to standard atmospheric pressure.
Claim 5
Dependent Claim
19 words
A flat panel display as in claim 1 wherein the layers of the backplate include a ceramic second layer.
Claim 6
Dependent Claim
18 words
A flat panel device as in claim 4 wherein the ceramic first and second layers adjoin each other.
Claim 7
Dependent Claim
28 words
A flat panel device as in claim 4 wherein the layers of the backplate include a patterned electrically conductive layer sandwiched between the ceramic first and second layers.
Claim 8
Dependent Claim
27 words
A flat panel device as in claim 1 wherein the layers of the backplate include an internal patterned electrically conductive layer that adjoins the ceramic first layer.
Claim 9
Dependent Claim
16 words
A flat panel device as in claim 1 wherein the ceramic is zero shrinkage tolerance ceramic.
Claim 10
Dependent Claim
22 words
A flat panel device as in claim 8 wherein the channels are situated in material of the backplate consisting primarily of ceramic.
Claim 11
Dependent Claim
21 words
A flat panel device as in claim 1 further including outer walls through which the backplate is connected to the faceplate.
Claim 12
Dependent Claim
33 words
A flat panel device as in claim 1 wherein the light-producing means comprises: cathode means for emitting electrons; and light-emitting means for emitting light upon being struck by electrons from the cathode means.
Claim 13
Dependent Claim
21 words
A flat panel device as in claim 11 wherein the cathode means comprises a field emitter cathode situated within the enclosure.
Claim 14
Dependent Claim
20 words
A flat panel device as in, claim 11 wherein the cathode means comprises a thermionic cathode situated within the enclosure.
Claim 15
Dependent Claim
36 words
A flat panel device as in claim 1 wherein conductive vias are located in the backplate, each conductive via being an opening which extends at least partly through the backplate and which contains electrically conductive material.
Claim 16
Dependent Claim
23 words
A flat panel device as in claim 14 wherein the controlling means is electrically connected to the light-producing means through the conductive vias.
Claim 17
Dependent Claim
34 words
A flat panel device as in claim 14 further comprising an addressing grid located at least partly within the enclosure, the controlling means being electrically connected to the addressing grid through the conductive vias.
Claim 18
Dependent Claim
24 words
A flat panel device as in claim 1 wherein the layers of the backplate include at least one internal layer of electrically conductive traces.
Claim 19
Dependent Claim
22 words
A flat panel device as in claim 17 wherein the controlling means is electrically connected to the light-producing means through the traces.
Claim 20
Dependent Claim
33 words
A flat panel device as in claim 17 further comprising an addressing grid located at least partly within the enclosure, the controlling means being electrically connected to the addressing grid through the traces.
Claim 21
Dependent Claim
20 words
A flat panel device as in claim 1 wherein the controlling means is situated on or connected to the backplate.
Claim 22
Dependent Claim
28 words
A flat panel device as in claim 1 wherein the controlling means comprises an integrated circuit chip that contains driver circuitry, the chip being attached to the backplate.
Claim 23
Dependent Claim
20 words
A flat panel device as in claim 1 wherein the controlling means comprises thin film transistors situated over the backplate.
Claim 24
Dependent Claim
50 words
A flat panel device as in claim 1 wherein the controlling means comprises: an electrode array comprising a group of first electrodes and a group of second electrodes that cross the first electrodes; and driver circuitry situated over the backplate for driving at least one of the groups of electrodes.
Claim 25
Dependent Claim
16 words
A flat panel device as in claim 23 wherein the driver circuitry comprises thin film transistors.
Claim 26
Dependent Claim
17 words
A flat panel device as in claim 1 wherein the controlling means comprises active matrix addressing elements.
Claim 27
Dependent Claim
25 words
A flat panel device as in claim 1 wherein the zero shrinkage tolerance ceramic has a firing shrinkage tolerance whose maximum magnitude is approximately 0.01%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-10 | 2001-05-12 | 2001-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-10 | 2005-05-12 | 2005-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-10 | 2009-05-12 | 2009-11-11 | $7700.00 | Window Closed / Lapsed |