Patent US5543691A successfully refreshed from Google Patents.
US5543691A
Expired / Lapsed
US
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Field emission display with focus grid and method of operating same
Assignee: Raytheon Co
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Filing: 1995-05-11
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Granted: 1996-08-06
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Expires: 2015-05-11
Abstract
Abstract A field emission display having a plurality of pixels is disclosed wherein each pixel includes a cathode with a plurality of field emitters and corresponding gate electrodes to emit electrons, an anode distally disposed with respect to the cathode, the anode and the cathode capable of having a voltage difference greater than 6000 volts, and a focus grid disposed between the anode and the cathode, the focus grid having an aperture and disposed in proximity with the cathode to focus electrons from the plurality of field emitters of the cathode toward the anode. With such an arrangement, a field emission display is provided having greater brightness and efficiency.
Inventors
- 👤 Alan Palevsky
- 👤 Peter F. Koufopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/127
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
84 words
A field emission device comprising: a cathode having an array of pixels, each pixel having a plurality of field emitters and corresponding gate electrodes to emit electrons; an anode distally disposed with respect to the cathode; and a focus grid disposed between the anode and the cathode, the focus grid having an array of apertures, each aperture disposed coaxial with a corresponding pixel of the cathode to focus electrons from the plurality of field emitters of the pixel of the cathode toward the anode.
Claim 2
Dependent Claim
84 words
A field emission device comprising: a cathode having an array of pixels, each pixel having a plurality of field emitters and corresponding gate electrodes to emit electrons; an anode distally disposed with respect to the cathode; and a focus grid disposed between the anode and the cathode, the focus grid having an array of apertures, each aperture disposed coaxial with a corresponding pixel of the cathode to focus electrons from the plurality of field emitters of the pixel of the cathode toward the anode.
Claim 3
Dependent Claim
26 words
The field emission device as recited in claim 1 wherein the anode and the cathode is capable of having a voltage difference greater than 2000 volts.
Claim 4
Dependent Claim
21 words
The field emission device as recited in claim 1 wherein each pixel of the cathode comprises at least 100 field emitters.
Claim 5
Dependent Claim
39 words
The field emission device as recited in claim 1 wherein spacing from the cathode to the focus grid is from 100 to 1000 microns and spacing from the focus grid to the anode is from 2 to 10 millimeters.
Claim 6
Dependent Claim
25 words
The field emission device as recited in claim 1 wherein each aperture in the focus grid has a diameter between 50 microns and 500 microns.
Claim 7
Dependent Claim
50 words
The field emission device as recited in claim 1 comprising offsetting the aperture of the focus grid from the cathode in a direction perpendicular to electron trajectory such that electrons are imaged to a point on the anode that is not in line with the aperture of the focus grid.
Claim 8
Dependent Claim
60 words
The field emission device as recited in claim 1 comprising a second focus grid disposed between the anode and the focus grid, the second focus grid having an aperture coaxial with the aperture of the focus grid and disposed in proximity with the focus grid to focus electrons from the plurality of field emitters of the cathode toward the anode.
Claim 9
Dependent Claim
60 words
The field emission device as recited in claim 7 comprising offsetting the aperture of the focus grid and the second focus grid from the cathode in a direction perpendicular to electron trajectory such that electrons are imaged to a point on the anode that is not in line with the apertures of the focus grid and the second focus grid.
Claim 10
Dependent Claim
95 words
A field emission display having a plurality of pixels, each one of the plurality of pixels comprising: a cathode with a plurality of field emitters and corresponding gate electrodes to emit electrons; an anode distally disposed with respect to the cathode, the anode and the cathode capable of having a voltage difference greater than 2000 volts; and a focus grid disposed between the anode and the cathode, the focus grid having an aperture and disposed in proximity with the cathode to focus electrons from the plurality of field emitters of the cathode toward the anode.
Claim 11
Dependent Claim
95 words
A field emission display having a plurality of pixels, each one of the plurality of pixels comprising: a cathode with a plurality of field emitters and corresponding gate electrodes to emit electrons; an anode distally disposed with respect to the cathode, the anode and the cathode capable of having a voltage difference greater than 2000 volts; and a focus grid disposed between the anode and the cathode, the focus grid having an aperture and disposed in proximity with the cathode to focus electrons from the plurality of field emitters of the cathode toward the anode.
Claim 12
Dependent Claim
60 words
The field emission display as recited in claim 9 comprising a second focus grid disposed between the anode and the focus grid, the second focus grid having an aperture coaxial with the aperture of the focus grid and disposed in proximity with the focus grid to focus electrons from the plurality of field emitters of the cathode toward the anode.
Claim 13
Dependent Claim
55 words
The field emission display as recited in claim 10 comprising offsetting the apertures of the focus grid and the second focus grid from the cathode in a direction perpendicular to electron trajectory such that electrons are imaged to a point on the anode that is not in line with the aperture of the focus grid.
Claim 14
Dependent Claim
50 words
The field emission display as recited in claim 9 comprising offsetting the aperture of the focus grid from the cathode in a direction perpendicular to electron trajectory such that electrons are imaged to a point on the anode that is not in line with the aperture of the focus grid.
Claim 15
Dependent Claim
118 words
A field emission display comprising: a cathode having an array of pixels, each pixel having a plurality of field emitters and corresponding gate electrodes to emit electrons; an anode distally disposed from 2 to 10 millimeters with respect to the cathode, the anode and the cathode capable of having a voltage difference greater than 2000 volts; and a focus grid disposed between the anode and the cathode with the focus grid disposed from 100 microns to 1000 microns from the cathode, the focus grid having an array of apertures, each aperture disposed coaxial with a corresponding pixel of the cathode to focus electrons from the plurality of field emitters of the pixel of the cathode toward the anode.
Claim 16
Dependent Claim
118 words
A field emission display comprising: a cathode having an array of pixels, each pixel having a plurality of field emitters and corresponding gate electrodes to emit electrons; an anode distally disposed from 2 to 10 millimeters with respect to the cathode, the anode and the cathode capable of having a voltage difference greater than 2000 volts; and a focus grid disposed between the anode and the cathode with the focus grid disposed from 100 microns to 1000 microns from the cathode, the focus grid having an array of apertures, each aperture disposed coaxial with a corresponding pixel of the cathode to focus electrons from the plurality of field emitters of the pixel of the cathode toward the anode.
Claim 17
Dependent Claim
21 words
The field emission display as recited in claim 13 wherein each pixel of the cathode comprises at least 100 field emitters.
Claim 18
Dependent Claim
25 words
The field emission display as recited in claim 14 wherein each aperture in the focus grid has a diameter between 50 microns and 500 microns.
Claim 19
Dependent Claim
50 words
The field emission display as recited in claim 15 comprising offsetting the aperture of the focus grid from the cathode in a direction perpendicular to electron trajectory such that electrons are imaged to a point on the anode that is not in line with the aperture of the focus grid.
Claim 20
Dependent Claim
64 words
The field emission display as recited in claim 15 comprising a second focus grid disposed between the anode and the focus grid, the second focus grid having an array of apertures, each aperture coaxial with the aperture of the focus grid and disposed in proximity with the focus grid to focus electrons from the plurality of field emitters of the cathode toward the anode.
Claim 21
Dependent Claim
26 words
The field emission display as recited in claim 17 wherein the second focus grid is disposed between 100 microns and 1000 microns from the focus grid.
Claim 22
Dependent Claim
55 words
The field emission display as recited in claim 18 comprising offsetting the apertures of the focus grid and the second focus grid from the cathode in a direction perpendicular to electron trajectory such that electrons are imaged to a point on the anode that is not in line with the aperture of the focus grid.
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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) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |