Gated filament structures for a field emission display
First Claim
1. A gated filament structure for a field emission display including a plurality of filaments, comprising:
- a substrate;
an insulating layer positioned adjacent to the substrate;
a metal gate layer, with a plurality of gates, the metalgate layer being positioned adjacent to the insulating layer and having an average thickness "s" and a top metal gate layer planar surface substantially parallel to a bottom metal gate layer planar surface, the metal gate layer including a plurality of apertures extending through the metal gate layer, each aperture having an average width "r" along a bottom planar surface of the aperture, each aperture defining a midpoint plane positioned parallel to and equally distant from the top metal gate layer planar surface and the bottom metal gate layer planar surface; and
a plurality of filaments each with a filament tip terminating at a point "A" and a filament axis extending along a length of the filament through filament tip, each filament positioned in an aperture, an intersection of the filament axis and the midpoint plane defining a point "O" with a majority of all filament tips of the display having a length "L" between each filament tip at point A and point O along the filament axis where,
space="preserve" listing-type="equation">L≦
(s+r)/2.2.
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Abstract
A gated filament structure for a field emission display includes a plurality of filaments. Included is a substrate, an insulating layer positioned adjacent to the substrate, and a metal gate layer position adjacent to the insulating layer. The metal gate layer has a plurality of gates, the metal gate layer having an average thickness "s" and a top metal gate layer planar surface that is substantially parallel to a bottom metal gate layer planar surface. The metal gate layer includes a plurality of apertures extending through the gates. Each aperture has an average width "r" along a bottom planar surface of the aperture. Each aperture defines a midpoint plane positioned parallel to and equally distant from the top metal gate layer planar surface and the bottom metal gate layer planar surface. A plurality of filaments are individually positioned in an aperture. Each filament has a filament axis. The intersection of the filament axis and the midpoint plane defines a point "O". Each filament includes a filament tip terminating at a point "A". A majority of all filament tips of the display have a length "L" between each filament tip at point A and point O along the filament axis where,
L≦(s+r)/2.
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Citations
15 Claims
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1. A gated filament structure for a field emission display including a plurality of filaments, comprising:
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a substrate; an insulating layer positioned adjacent to the substrate; a metal gate layer, with a plurality of gates, the metalgate layer being positioned adjacent to the insulating layer and having an average thickness "s" and a top metal gate layer planar surface substantially parallel to a bottom metal gate layer planar surface, the metal gate layer including a plurality of apertures extending through the metal gate layer, each aperture having an average width "r" along a bottom planar surface of the aperture, each aperture defining a midpoint plane positioned parallel to and equally distant from the top metal gate layer planar surface and the bottom metal gate layer planar surface; and a plurality of filaments each with a filament tip terminating at a point "A" and a filament axis extending along a length of the filament through filament tip, each filament positioned in an aperture, an intersection of the filament axis and the midpoint plane defining a point "O" with a majority of all filament tips of the display having a length "L" between each filament tip at point A and point O along the filament axis where,
space="preserve" listing-type="equation">L≦
(s+r)/2.2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- 3. The gated filament structure of claim 1, wherein at least 90% of all filament tips of the display have a length L between each filament tip at point A and point O along the filament axis where,
- space="preserve" listing-type="equation">L≦
(s+r)/2.
4. - space="preserve" listing-type="equation">L≦
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4. The gated filament structure for a field emission display of claims 1, 2 or 3, wherein the field emission display has a six inch diagonal dimension.
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5. The gated filament structure for a field emission display of claims 1, 2 or 3, wherein the field emission display has an eight inch diagonal dimension.
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6. The gated filament structure for a field emission display of claims 1, 2 or 3, wherein the field emission display has a ten inch diagonal dimension.
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7. The gated filament structure for a field emission display of claims 1, 2 or 3, wherein the plurality of gated filaments are electroplated.
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8. The gated filament structure for a field emission display of claim 1, wherein point A is positioned above the top metal gate layer planar surface.
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9. The gated filament structure for a field emission display of claim 1, wherein point A is positioned bellow the bottom metal gate layer planar surface.
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10. The gated filament structure of claim 1, wherein the thickness of the insulating layer varies in the display.
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11. The gated filament structure of claims 1, 2 or 3, wherein each filament is vertically self aligned in its associated aperture.
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12. The gated filament structure of claim 1, further comprising:
- a metal row electrode positioned on a top surface of the substrate.
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13. The gated filament structure of claim 12, wherein the field emission display has a ten inch diagonal and the filaments are electroplated.
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14. The gated filament structure of claim 12, further comprising:
a resistive layer at least partially positioned on a top surface of the metal row electrode.
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15. The gated filament structure of claim 1 wherein the aperture has a size of about 0.1 microns or greater.
Specification