Field emission display (FED) and method for assembling...

Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube

Reexamination Certificate

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Details

C445S024000

Reexamination Certificate

active

06262528

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a field emission display (FED), and more particularly, to a method for assembling a spacer for maintaining a constant interval between an anode plate and a cathode plate, and to an FED employing the same.
2. Description of the Related Art
Referring to a conventional field emission display (FED) of
FIG. 1
, an anode plate
11
and a cathode plate
12
face to each other, maintained at a constant spacing by a spacer
13
. A plurality of micro tips
14
are formed on a cathode
12
a
of the cathode plate
12
. The micro tips
14
are surrounded and exposed by an insulating layer
15
. Gates
17
are formed on the insulating layer
15
. A fluorescent film
18
is formed under an anode
11
a
of the anode plate
11
.
In manufacturing the FED, the spacer
13
is formed by screen-printing and curing a glass paste several times, using a mask
19
.
By the screen-printing method, it is known that the screen-printing and the curing must be repeated approximately 7 times to form the spacer
13
giving a spacing of approximately 200 &mgr;m between the anode plate
11
and the cathode plate
12
. The process repetitions are proportional to the spacing between the anode plate
11
and the cathode plate
12
. The screen-printing method requires repetition of screen-printing and curing and thus manufacturing spacers requires much time. Also, in the screen-printing, the glass paste may flow down, and it is difficult to increase an aspect ratio, i.e., the ratio of the height of the spacer
13
to the width thereof, to 1 or more, due to an alignment error of the screen.
Further, some of the electrons emitted from the micro tips
14
collide with the spacer
13
made of glass, and are dispersed.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a method for assembling a spacer of a field emission display (FED) in which the spacer can be simply assembled between an anode plate and a cathode plate, and an aspect ratio of the spacer is 1 or more, and an FED manufactured using the same.
It is another objective of the present invention to provide a spacer in which the spacer supplies a repulsive force against electron beams to suppress dispersion of the electron beams and increase luminosity.
Accordingly, to achieve the above objective, a method for assembling a spacer of a FED including the steps of (a) forming a plurality of holes in an anode plate or a cathode plate, (b) coating an adhesive on a first end of each of a plurality of spacers of a predetermined length for maintaining the spacing between the anode plate and the cathode plate by a predetermined value, and/or in the holes, (c) inserting the first ends of the spacer respectively into the holes, and (d) curing the adhesive.
The step (a) may include the substeps of coating a photosensitive layer of a predetermined thickness on the anode plate or cathode plate, etching the photosensitive layer in a region where the holes are to be formed, to thereby form openings, forming holes in the anode or cathode plate exposed by the openings, using sand blasting, and removing the photosensitive layer.
Otherwise, the step (a) may include the steps of coating a photosensitive layer of a predetermined thickness on the anode plate or cathode plate, etching the photosensitive layer in a region where the holes are to be formed, to thereby form openings, etching the anode or cathode plate exposed by the openings to form the holes, and removing the photosensitive layer.
According to another aspect of the present invention, there is provided a method for assembling a spacer of a FED including the steps of (a) forming a multitude of openings where connection holes are to be formed there between, in an anode of an anode plate, (b) forming holes in the openings, smaller than the openings, in the anode plate, (c) forming a grid line in the connection holes on the anode plate for electrically connecting the holes, separated from the anode, (d) providing spacers each consisting of a glass fiber and a conductive layer coated on part of the outer surface of the glass fiber, extending from one end of the glass fiber, (e) coating metal paste for adhesion on the end of each spacer having the conductive layer, and in the holes, (f) inserting the ends of the spacers having the conductive layer respectively into the holes, and (g) curing the metal paste.
The FED according to another aspect of the present invention includes anode and cathode plates facing each other, having facing surfaces on which anodes and cathodes of a predetermined pattern are respectively formed, a multitude of micro tips formed on the cathode, at a predetermined spacing, an insulating layer formed on the cathode plate, surrounding and exposing the micro tips, a gate formed on the insulating layer, and spacers interposed between the anode plate and the cathode plate to maintain a predetermined spacing between the anode plate and the cathode plate, each having one end fixed in a hole formed on the anode plate.
The spacer comprises a glass fiber having one end fixed in the hole formed on the anode plate, and a conductive layer coated on the surface of the glass fiber to a predetermined length, to partially expose the surface of the glass fiber.


REFERENCES:
patent: 5708325 (1998-01-01), Anderson et al.
patent: 5720640 (1998-02-01), Lu et al.
patent: 5859508 (1999-01-01), Ge et al.
patent: 5864205 (1999-01-01), Dworsky
patent: 6008573 (1999-12-01), Beeteson et al.

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