Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Reexamination Certificate
2000-01-13
2002-04-30
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
C315S169100, C315S169200, C315S169300, C345S204000, C345S206000, C313S313000
Reexamination Certificate
active
06380681
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a video display having a display panel provided with anodes and cathodes arranged orthogonally to each other to form grids, and also to a manufacturing method for such a video display.
FIG. 5A
is a plan view of a related art electroluminescent (EL) display panel in an active matrix drive type EL video display, and
FIG. 5B
is a cross section view taken along the line B—B in FIG.
5
A. As shown in
FIGS. 5A and 5B
, the EL display panel
11
includes a glass substrate
12
, a plurality of anodes
13
formed on one surface of the glass substrate
12
opposite to the display surface of the EL display panel
11
so as to be arranged in rows, for example, a plurality of EL phosphor layers
14
formed in the form of matrix, an insulating layer (not shown) formed on the EL phosphor layers
14
, and a plurality of cathodes
15
formed on the insulating layer so as to be arranged in columns, for example.
To drive the EL display panel
11
, a drive circuit must be connected to the anodes
13
and the cathodes
15
. To this end, the related art EL display panel
11
shown in
FIGS. 5A and 5B
is formed with an L-shaped region
16
along adjacent two sides of the EL display panel
11
as a dedicated region for electrical connection of the anodes
13
and the cathodes
15
to the drive circuit. Although not shown, electronic components constituting the drive circuit are mounted on a printed wiring board separate from the EL display panel
11
, and wirings formed on the printed wiring board are connected at first ends to the electronic components and connected at second ends to the anodes
13
and the cathodes
15
in the L-shaped region
16
.
However, in the related art EL display panel
11
having the L-shaped region
16
dedicated for electrical connection, no video image is displayed in this region
16
. Further, if the area of the EL display panel
11
is large, the yield of such large EL display panels manufactured is reduced. In addition, the area of the EL display panel
11
that can be manufactured is limited.
Accordingly, it is desirable to planarly join a plurality of EL display panels
11
as shown in
FIG. 6
to thereby display a single large-sized video image. However, since no video image is displayed in each region
16
, the large-sized video image displayed on the plural EL display panels
11
planarly joined has discontinuities corresponding to the regions
16
. That is, a large-sized video image with no discontinuities cannot be displayed by the configuration shown in FIG.
6
.
Furthermore, since the electronic components constituting the drive circuit are mounted on the printed wiring board separate from the EL display panel
11
, the total thickness of the EL display panel
11
and the printed wiring board is large, so that it is difficult to reduce the thickness of the entire EL video display using the related art EL display panel
11
mentioned above.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide a video display which can display a large-sized video image with no discontinuities and can be reduced in thickness.
It is another object of the present invention to provide a manufacturing method for the video display mentioned above.
In accordance with an aspect of the present invention, there is provided a video display comprising a display panel having a plurality of anodes and cathodes arranged orthogonally to each other so as to form grids; a printed wiring board having a drive circuit with wirings for driving the display panel and a plurality of bumps for electrically connecting the wirings of the drive circuit to the anodes and the cathodes; and an adhesive layer for bonding the display panel and the printed wiring board to form a multilayer structure. That is, the anodes and the cathodes of the display panel are electrically connected through the bumps to the wirings of the printed wiring board, and the display panel and the printed wiring board are bonded together through the adhesive layer. With this structure, the display panel is not required to have any dedicated region for electrically connecting the anodes and the cathodes of the display panel to the drive circuit for driving the display panel. Further, the total thickness of the display panel and the printed wiring board is small.
Preferably, the drive circuit comprises a plurality of electronic components mounted on one surface of the printed wiring board for driving the display panel, and the bumps are formed on the other surface of the printed wiring board. That is, the electronic components for driving the display panel are mounted on one surface of the printed wiring board opposite to its bump forming surface. With this structure, the electronic components for driving the display panel are integrated with the display panel.
In accordance with another aspect of the present invention, there is provided a manufacturing method for a video display, comprising the steps of preparing a display panel having a plurality of anodes and cathodes arranged orthogonally to each other so as to form grids; preparing a printed wiring board having a drive circuit with wirings for driving the display panel and a plurality of bumps for electrically connecting the wirings of the drive circuit to the anodes and the cathodes; forming an adhesive layer on any one of one surface of the display panel on which the anodes and the cathodes are provided and one surface of the printed wiring board on which the bumps are provided; and electrically connecting the anodes and the cathodes through the bumps to the wirings and bonding the display panel through the adhesive layer to the printed wiring board. That is, the anodes and the cathodes of the display panel and the wirings of the printed wiring board are electrically connected together through the bumps, and the display panel and the printed wiring board are bonded together through the adhesive layer. Accordingly, it is possible to manufacture a video display in which the display panel is not required to have any dedicated region for electrically connecting the anodes and the cathodes of the display panel to the drive circuit for driving the display panel, and the total thickness of the display panel and the printed wiring board can be reduced.
Preferably, the manufacturing method further comprises the step of mounting a plurality of electronic components for driving the display panel on the other surface, opposing to the surface with bumps, of the printed wiring board. That is, the electronic components for driving the display panel are mounted on one surface of the printed wiring board opposite to its bump forming surface. Accordingly, it is possible to manufacture a video display in which the electronic components for driving the display panel are integrated with the display panel.
Other objects and features of the invention will be more fully understood from the following detailed description and appended claims when taken with the accompanying drawings.
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patent: 5703394 (1997-12-01), Wei et al.
patent: 5777610 (1998-07-01), Sugimoto et al.
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patent: 6275220 (2001-08-01), Nitta
patent: 0 578 403 (1994-01-01), None
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Patent Abstracts of Japan, vol. 1997, No. 08, Aug. 29, 1997, JP 09 097812.
Patent Abstracts of Japan, “Connection of Circuit Board”, Apr. 08, 1997, JP 09097812.
Asai Nobutoshi
Matsuda Yoshinari
Odake Ryota
Suzuki Yoshio
Frommer William S.
Frommer & Lawrence & Haug LLP
Megerditchian Samuel H.
Sony Corporation
Vu Jimmy T.
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