Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2000-02-28
2001-10-09
Sikes, William L. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S150000, C349S151000, C349S152000
Reexamination Certificate
active
06300997
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 11-057340, filed Mar. 4, 1999, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device having a panel connected to an IC chip mounted on a narrow film wiring board.
A liquid crystal display device has a liquid crystal display panel and an IC chip for driving the liquid crystal display panel. U.S. Pat. No. 4,799,771 discloses a liquid crystal display device comprising a liquid crystal display panel and a plurality of IC modules. The IC modules, for driving scanning electrodes and data electrodes, are arranged on sides of the panel. Each IC module is mounted on a film wiring board called a carrier tape, which is generally called a TCP (Tape Carrier Package). The scanning and data electrodes are arranged on each side of the liquid crystal display panel along its entire length. They are connected by, for example, anisotropic conductive adhesive, to lead terminals formed on the carrier tape on which each IC module is mounted. At this time, naturally, the electrodes are positioned and bonded to the lead terminals in every IC chip. Therefore, the more the number of IC modules, the longer the required process time.
Recently, the electrodes of an IC chip can be arranged at a very small pitch, owing to the high integration of IC chips and the progress of the bonding technique. However, so long as the lead terminals formed on a carrier tape are connected to the scanning electrodes or the data electrodes arranged on a liquid crystal display panel, the width of the carrier tape cannot be reduced. This matter will be described in detail with reference to
FIG. 5. A
liquid crystal display panel
1
is constituted by a segment (data) substrate
2
on the upper side and a common (scanning) substrate
3
on the lower side adhered by a substantially frame-shaped sealing member (not shown), and liquid crystal (not shown) sealed within a space between the substrates
2
and
3
enclosed by the sealing member. The segment substrate
2
is longer than the common substrate
3
. A side portion
2
a
of one of the long sides is projected from a lower edge of the common substrate
3
. A number of contact terminals
5
are formed on the lower face of the projected portion
2
a.
An IC module
21
of this liquid crystal display device has a film wiring board
22
. The film wiring board
22
has a substantially rectangular portion and a square projected portion projected from a central portion of the lower end of the rectangular portion. The width in the lateral direction of the drawing of the rectangular portion is slightly smaller than the width in the lateral direction of the liquid crystal display panel
1
. A semiconductor chip
23
made of an LSI or the like, for driving the liquid crystal display panel
1
, is mounted on a substantially central portion of the film wiring board
22
.
Lead wires
24
,
25
and
26
are formed on the upper surface of the film wiring board
22
. First ends of the lead wires
24
are connected to electrodes arranged along a long side of the semiconductor chip
23
. Second ends thereof are connected to those parts of contact terminals
5
which are located in a central portion of the projected portion
2
a
of the liquid crystal display panel
1
. First ends of the lead wires
25
and
26
are connected to electrodes arranged along the short sides of the semiconductor chip
23
. Second ends thereof are connected to those parts of the contact terminals
5
which are arranged in side portions of an end of the projected portion
2
a
of the liquid crystal display panel
1
.
Since the lead wires
24
,
25
and
26
are connected to the contact terminals arranged substantially along the entire length of the liquid crystal display panel
1
, the width w
t
of the film wiring board
22
is almost the same as the width w
p
of the liquid crystal display panel
1
. Therefore, if film wiring boards
22
are obtained by cutting a long base film, merely a small number of film wiring boards can be produced, resulting in a high cost. In addition, since the mounting area is large, the degree of freedom of mounting is small. Moreover, since the wiring board is liable to receive external force, reliable interconnection cannot be achieved.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to reduce the width and area of a film wiring board connected to a liquid crystal display panel, thereby improving the degree of freedom of mounting and the reliability of interconnection.
According to the present invention, there is provided a display device comprising:
a display panel including a display region, which has a substrate and a number of wires formed on the substrate, and a contact terminal arrangement region, the display region of the display panel having a side of a length,
the contact terminal arrangement region being shorter than the length of the side of the display region and having a central portion including a plurality of first contact terminals, a left side portion adjacent to the central portion and including a plurality of second contact terminals and a right side portion including a plurality of third contact terminals, the second and third contact terminals extending in directions crossing the first contact terminals, and the wires being respectively connected to the first, second and third contact terminals;
a film wiring board having lead wires, respectively connected to the first, second and third contact terminals; and
a semiconductor chip connected to the lead wires of the film wiring board.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.
REFERENCES:
patent: 4687300 (1987-08-01), Kubo et al.
patent: 4799771 (1989-01-01), Taniguchi
patent: 5016986 (1991-05-01), Kawashima et al.
patent: 5402255 (1995-03-01), Nakanishi et al.
patent: 5680191 (1997-10-01), Voisin et al.
patent: 5712493 (1998-01-01), Mori et al.
patent: 5737053 (1998-04-01), Yomogihara et al.
patent: 6052170 (2000-04-01), Kobayashi
patent: 04-147221-A (1992-05-01), None
Kurashima Isao
Saito Hirokazu
Sugiyama Kazuhiro
Casio Computer Co. Ltd.
Chowdhury Tarifur R.
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Sikes William L.
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