Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2002-06-06
2004-10-19
Dudek, James (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S149000
Reexamination Certificate
active
06806938
ABSTRACT:
This application is based on applications Nos. 2001-261510, 2001-298550, 2001-352822, 2001-358717, 2001-361553, and 2001-378905 filed in Japan, the content of which is incorporated hereinto by reference.
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a small size liquid crystal display device, a portable terminal and display equipment provided with such a liquid crystal display device.
Description of the Related Art
Conventional STN type liquid crystal displays P
1
and P
2
are now discussed referring to
FIGS. 47-52
.
FIG. 47A
is a plan view of the liquid crystal display P
1
.
FIG. 47B
is a right-side view of the same, and
FIG. 47C
is an upper-side view of the same. The liquid crystal display P
1
is arranged such that two rectangularly shaped glass substrates are joined together. There are provided two driver ICs (not shown) one of which is for segment electrodes, and the other is for common electrodes. The driver ICs are disposed along two sides of the glass substrate
1
external to the respective sides. When mounting the driver ICs on the body substrate, TCP (Tape Carrier Package) or COF (Chip on Film) is used. (Refer to Japanese Unexamined Patent Publication H08-179348.)
On the glass substrate
2
, a group of transparent common electrodes
4
and a wiring pattern
5
with a trapezoidal shape which extends from the transparent common electrode group
4
are provided. On the other glass substrate
1
, there are provided a group of transparent segment electrodes
10
, and a wiring pattern
9
with a trapezoidal shape which extends from the transparent segment electrode group
10
. The area where the transparent common electrode group
4
and the transparent segment electrode group
10
cross each other form a display area
3
.
On edges of two sides of the glass substrate
1
, there are provided common-side terminal group
6
connected with the wiring pattern
5
, and segment-side terminal group
8
connected with the wiring pattern
9
. TCPs or COFs are mounted on the common-side terminal group
6
and segment-side terminal group
8
by thermal pressure using an anisotropic conductive film.
A sealing resin
7
is provided external to the display area
3
so as to surround the display area
3
. The glass substrates
1
and
2
are bonded together with the sealing resin
7
, and the internal space between them is filled with a liquid crystal
12
by injecting it through an injection inlet
13
. Then, it is sealed with a UV curable resin
11
.
When the number of pixels is represented by m×n, since one pixel is constituted of three kinds of colors i.e. R (red), G (green) and B (blue) in the colorized liquid crystal display device P, the number of transparent segment electrodes
10
to be provided is 3m. The numbers of wires in the wiring patterns
9
and segment-side terminals
8
are also 3m. The numbers of transparent common electrodes
4
, wires in the wiring pattern
5
and common-side terminals
6
are n, respectively. These are shown with a part thereof omitted in the drawings.
FIG. 48
is a cross-sectional view taken along the line a—a in FIG.
47
A.
The sealing resin
7
contains conductive particles
14
. The common-side terminal group
6
and the wiring pattern
5
are connected vertically by the conductive particles
14
. The portions connecting them vertically are referred to as “conduction portions between substrates.”
On the transparent common electrode group
4
, an alignment film
23
for aligning the liquid crystal
12
is formed. Also, an alignment film
24
is formed on the transparent segment electrode group
10
. Between the alignment films
23
and
24
, spacers
45
are dispersed in order to keep the gap S between the substrates at a constant distance.
In the above-mentioned liquid crystal display device P
1
, however, the arrangement is such that two driver ICs one of which is for segment electrodes and the other for common electrodes are mounted along and external to two sides of the assembly of two rectangularly shaped glass substrates bonded together. Accordingly, two driver ICs are required in this structure.
Accordingly, it has been desired to integrate the functions of both of the driver ICs into one driver IC thereby reducing the IC cost and the mounting cost.
A liquid crystal display device P
2
provided with one driver IC prepared in the above-mentioned way is now described.
FIG. 49A
is a plan view of the liquid crystal display device P
2
.
FIG. 49B
is a right-side view of the same, and
FIG. 49C
is an upper-side view of the same.
FIG. 50
is an enlarged view of an essential part B shown in FIG.
49
A.
FIG. 51
is a cross-sectional view taken along the line c—c in FIG.
50
.
FIG. 52
is a cross-sectional view taken along the line d—d in FIG.
50
. In these drawings, parts corresponding to those in the liquid crystal display device P
1
described above are denoted by the same reference characters.
As shown in
FIG. 49A
, the display area
3
is divided into the upper area and the lower area. The transparent common electrode group
4
in the upper area is drawn to the right side, and the transparent common electrode group
4
in the lower area is drawn to the left side. They are connected to the wiring patterns
5
A and
5
B, respectively, on the glass substrate
2
. These wiring patterns
5
A and
5
B are extended to the conduction portions between substrates Q
21
and Q
22
, respectively.
The conduction portions between substrates Q
21
and Q
22
are provided for electrically connecting the wiring patterns
5
A,
5
B on the glass substrate
2
to the wiring pattern
20
on the glass substrate
1
. In this example, the sealing resin
7
containing conductive particles
14
is used for these portions as shown in FIG.
51
.
The wiring pattern
20
is a pattern made of ITO, which spreads in the form of a trapezoid. The wiring pattern
20
is connected to the common-side terminal group
6
disposed on the both sides of the segment-side terminal group
8
. In the conduction portions between substrates Q
21
and Q
22
, in order to stably connect the upper and lower electrodes to each other with low resistance to conduction by bringing them into contact with many conductive particles
14
, the wiring width D of the wiring patterns
5
and
20
needs to be as large as possible. In addition, in order to prevent the conductive particles
14
from causing short-circuit among adjacent wires, a spacing S larger than a specific distance is required between each of the wires (See FIG.
52
).
Accordingly, under the present circumstances, wiring pitch P (P=wiring width D+wiring spacing S) in the conduction portions between substrates Q
21
and Q
22
is made larger than the wiring pitch (in the order of 60 &mgr;m) of the common-side terminal group
6
.
It is therefore necessary to provide an area (represented by the size L in
FIG. 49A
) for routing the wiring pattern
20
spreading from the common-side terminal group
6
in the form of a sector.
This makes the longitudinal size of the panel large, failing to meet the recent market demand for downsizing. For example, such a panel is inconvenient to be used as LCD panel for mobile phone in which the panel dimensions are restricted.
In addition, regarding small size liquid crystal display devices for mobile phones, it is often the case that wiring patterns
5
and
9
are viewable from the display surface due to its small area. When the wiring patterns
5
and
9
are formed of a metal material, light reflected from the patterns deteriorates the visibility. Improvement in this respect is also anticipated.
It is an object of this invention to provide a liquid crystal display device capable of accomplishing downsizing thereof by reduced dimensions.
It is another object of this invention to provide a liquid crystal display device which is suitable for a portable terminal such as mobile phone.
It is still another object of this invention to provide display equipment in which downsizing thereof is accomplished.
It is still another object of this inventi
Asakura Shinji
Fukuoka Hiromi
Motomura Toshirou
Dudek James
Hogan & Hartson LLP
Kyocera Corporation
Rude Timothy L
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