Coating processes – Electrical product produced – Electron emissive or suppressive
Reexamination Certificate
2001-10-17
2004-02-17
Talbot, Brian K. (Department: 1762)
Coating processes
Electrical product produced
Electron emissive or suppressive
C427S282000, C427S307000, C427S372200, C427S402000, C430S313000, C445S051000
Reexamination Certificate
active
06692791
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for manufacturing a carbon nanotube field emission display, particularly to a low-cost fabrication method for large area triode structure carbon nanotube field emission displays.
2. Description of the Prior Art
Carbon nanotube field emission displays are matrix displays wherein each pixel comprises a carbon nanotube layer as a cathode for electron emission and transparent electrodes act as anodes attracting the emitted electrons. Light from the pixel image is emitted when the electrons collide with the fluorescent material on the transparent electrodes. This is a diode structure carbon nanotube field emission display.
Triode carbon nanotube field emission displays were developed because diode structure results in high operating voltage. The triode structure additionally has a gate near the carbon nanotube layer. The voltage applied to the gate determines the emission and amount of the electrons. This reduces the operating voltage.
FIGS. 1A-1E
are diagrams showing a conventional method for manufacturing a carbon nanotube field emission display.
As shown in
FIG. 1A
, a glass substrate
11
is provided.
As shown in
FIG. 1B
, a conducing layer
12
with lines, such as Ag, is screen printed on the glass substrate
11
as a cold cathode.
As shown in
FIG. 1C
, an isolation layer
13
is coated on the conducting layer
12
by screen printing and cavities
131
are formed by the pattern of the halftone used for the screen printing.
As shown in
FIG. 1D
, a conducting layer
14
with lines, such as Ag, is further screen printed on the isolation layer
13
as gates. The lines of the conducting layers
12
and
14
are perpendicular. Cavities
141
aligned with the cavities
131
are formed by the pattern of the halftone used for the screen printing. The pattern of the halftone also defines the gates.
Finally, as shown IN
FIG. 1E
, the conducting layer
12
,
14
and the isolation layer
13
are sintered and carbon nanotube layer
15
are formed in the cavities
131
on the conducting layer
12
for electron emission.
In the conventional method described previously, gentle slopes are formed on the edges of the cavities
131
and
141
due to the spreading of the slurry of the conducting and isolation layers
14
and
13
. This reduces the area for the carbon nanotube layer
15
, increases the distances between the carbon nanotube layer
15
and the conducting layer
14
and causes a high operating voltage. Meanwhile, the gentle slopes of the cavities
141
also may cause short circuits between the layers
12
and
14
. These drawbacks are more serious in a large area carbon nanotube field emission display manufactured by the conventional method.
SUMMARY OF THE INVENTION
The present invention provides a low-cost method for manufacturing a large area triode structure carbon nanotube field emission display. The method comprises the steps of providing a substrate, screen printing a first conducting layer on the substrate, sintering the first conducting layer, screen printing an isolation layer on the first conducting layer and a second conducting layer on the isolation layer, etching the second conducting layer and the isolation layer, whereby a cavity exposing the first conducting layer is formed, sintering the second conducting layer and the isolation layer, and forming a carbon nanotube layer on the first conducting layer in the cavity.
The present invention further provides a method for manufacturing a carbon nanotube field emission display. The method comprises the steps of providing a substrate, screen printing a first conducting layer on the substrate, sintering the first conducting layer, forming a carbon nanotube layer on the first conducting layer and a protection layer on the carbon nanotube layer, sintering the carbon nanotube layer and the protection layer, screen printing an isolation layer on the first conducting layer and the protection layer, and a second conducting layer on the isolation layer, etching the second conducting layer and the isolation layer, whereby a cavity exposing protection layer and the first conducting layer is formed, and sintering the second conducting layer and the isolation layer, and removing the protection layer.
REFERENCES:
patent: 6436221 (2002-08-01), Chang et al.
patent: 6440761 (2002-08-01), Choi
patent: 2001/0004979 (2001-06-01), Han et al.
patent: 2002/0094494 (2002-07-01), Chung et al.
Chang Yu-Yang
Lee Chen-Chung
Lee Chun-Tao
Sheu Jyh-Rong
Birch & Stewart Kolasch & Birch, LLP
Industrial Technology Research Institute
Talbot Brian K.
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