Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Reexamination Certificate
2001-08-08
2004-01-27
Lee, Eddie (Department: 2815)
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
C349S149000, C349S139000, C349S157000
Reexamination Certificate
active
06683661
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display (hereinafter referred simply as an LCD) and an image display device, and more particularly to the LCD used as a monitor or a like of a computer and provided with liquid crystal cells arranged in a matrix form and the image display device equipped with the above LCD.
The present application claims priority of Japanese Patent Application No. 2000-241714 filed on Aug. 9, 2000, which is hereby incorporated by reference.
2. Description of the Related Art
FIG. 10
is a top view of an example of configurations of a conventional LCD constructed of a transverse electric field-type liquid crystal which has been disclosed in Japanese Laid-open Patent Application No. 2001-125122. Here, the transverse electric field-type liquid crystal refers to a liquid crystal in which an electric field is formed in a transverse direction (that is, in a direction parallel to an upper face on an glass substrate
1
being approximately quadrangular on which the LCD is formed) in a liquid crystal cell. The transverse electric field-type liquid crystal has a characteristic of having a small dependency on a viewing angle in contrast and therefore it is increasingly used in recent years.
The disclosed LCD is an active-matrix LCD using a TFT (Thin Film Transistor) as a switching element and, as shown in
FIG. 11
, includes a dot pixel portion
4
surrounded by a plurality of scanning lines
2
disposed at specified intervals in a column direction (that is, in a longitudinal direction) and a plurality of signal lines
3
disposed at specified intervals in a row direction (that is, in a transverse direction), a liquid crystal cell
5
mounted on each of the dot pixel portion
4
having a liquid crystal layer serving equivalently as a capacitive load, a pixel electrode
6
and a common electrode
8
formed opposite to each other in a manner that a liquid crystal layer is put between the pixel electrode
6
and the common electrode
8
and a TFT
7
whose source is connected to one end of the pixel electrode
6
. The LCD in this example displays characters, images, or a like, while a common voltage V
com
is applied to the common electrode
8
through a common signal line
9
in each row and in each column, when a data signal produced based on a video signal is applied to the signal line
3
and when a scanning signal produced based on a horizontal sync signal and a vertical sync signal is applied to the scanning line
2
. Each of the common signal lines
9
is connected to a common wiring
10
which is mounted in a shape of an approximate character “
” (or the approximate character “
”) (see
FIG. 10
) in a manner that it surrounds a display area
11
where the dot pixel portion
4
are arranged in a matrix form.
Moreover, though not shown in
FIG. 11
, more exactly, it can be considered as if an equivalent capacitors were to be formed by the liquid crystal layer serving as a dielectric in the liquid crystal cell
5
and by the pixel electrode
6
and the common electrode
8
sandwiching the liquid crystal layer in a manner to be opposite to each other and that other capacitors are further connected in parallel to the liquid crystal layer of the liquid crystal cell
5
. These other capacitors are called a common storage in a sense that they are formed relative to the common electrode
8
and called an auxiliary capacitor in a sense that it helps the liquid crystal layer in the liquid crystal cell
5
to accumulate a signal charge for one vertical sync period of time.
In the LCD shown in
FIG. 10
, all the signal lines
3
are routed to an upper portion on an upper side of the display area
11
and divided into three blocks
12
1
to
12
3
and a plurality of signal lines
3
making up each of the blocks
12
1
to
12
3
is gathered in a manner to form an approximately trapezoidal shape and an end of each of the signal lines
3
is connected to each of corresponding signal terminals arranged at a predetermined pitch. Similarly, all the scanning lines
2
are routed both to a right portion on a right side of the display area
11
and to a left portion on a left side of the display area
11
and divided into three blocks
13
1
to
13
3
and
14
1
to
14
3
and a plurality of scanning lines
2
making up each of the blocks
13
1
to
13
3
and of the blocks
14
1
to
14
3
is gathered in a manner to form an approximately trapezoidal shape and an end of each of the scanning lines
2
is connected to each of corresponding scanning terminals arranged at a predetermined pitch. A pair of the scanning terminals disposed in a position symmetrical right and left is connected to each other through the same scanning line
2
.
The common wiring
10
, as shown in
FIG. 10
, is mounted in a portion adjacent to the display area
11
in a shape of the approximate character “
” (or the approximate character “
”). The common wiring
10
is routed to an upper portion of the glass substrate
1
along both ends of each of the blocks
12
1
to
12
3
in the upper portion on the upper side of the display area
11
to form routing sections
10
a1
to
10
a6
. The common wiring
10
is routed to a leftmost portion of the glass substrate
1
along both ends of each of the blocks
13
1
to
13
3
in the left portion on the left side of the display area
11
to form the routing sections
10
b1
to
10
b6
. The common wiring
10
is routed to a rightmost portion of the glass substrate
1
along both ends of each of the blocks
14
1
to
14
3
in the right portion on the right side of the display area
11
to form the routing sections
10
c1
to
10
c6
. An end of each of the routing sections
10
a1
to
10
a6
,
10
b1
to
10
b6
, and
10
c1
to
10
c6
is connected to each of corresponding common terminals
15
1
to
15
6
,
16
1
to
16
6
, and
17
1
to
17
6
respectively.
The aim of dividing the scanning lines
2
and signal lines
3
into blocks
12
1
to
12
3
,
13
1
to
13
3
, and
14
1
to
14
3
each having specified numbers of lines and of forming each of the routing sections
10
a1
to
10
a6
,
10
b1
to
10
b6
, and
10
c1
to
10
c6
of the common wiring
10
along both ends of corresponding blocks
12
1
to
12
3
,
13
1
to
13
3
, and
14
1
to
14
3
and of routing the scanning lines
2
and signal lines
3
to form the approximately trapezoidal shape so that each of the end portions is connected to each of the scanning terminal and of the signal terminals and each of common terminals being mounted to be placed at the specified pitch, is to place each of terminals and end portions fixedly in a specified position. Also, the aim of placing each of terminals and end portions fixedly in the specified position is to enable a package being one of a TCP (Tape Carrier Package) mounted by using TAB (Tape Automated Bonding) technology and being used in a driving circuit to drive the LCD to be commonly used in different kinds of the LCDS. The LCD, while the TCP is connected, by using a thermo compression bonding method, to the scanning terminals and signal terminals connected to the blocked scanning lines
2
and signal lines
3
and common terminals
15
1
to
15
6
,
16
1
to
16
6
, and
17
1
to
17
6
connected to the common wiring
10
, is connected to a driving circuit mounted on the TCP or a printed board through the TCP. That is, by arranging each of the terminals and end portions at the specified pitch being common to various types of the LCD, each of terminals of the TCP to be connected to these terminals can be placed in a specified position accordingly and a package for the driving circuit being the TCP can be used commonly in different kinds of the LCDs.
By configuring above, since common terminals
15
1
to
15
6
,
16
1
to
16
6
, and
17
1
to
17
6
for every block made up of the scanning lines
2
and signal lines
3
are provided, wiring resistance of the common wiring
10
can be dispersed more and can be reduced more, as a whole, compared with a case in which the common terminal are mounted simply o
Lee Eddie
McGinn & Gibb PLLC
NEC LCD Technologies Ltd.
Nguyen Joseph
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