JP2802156B2 - Liquid crystal display - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to an active matrix type liquid crystal panel using thin film transistors as switching elements.

2. Description of the Related Art In recent years, with the advancement of microfabrication technology, liquid crystal material, and packaging technology, a liquid crystal display device capable of obtaining a good television image with a size of about 1 to 5 inches has been produced on a commercial basis.

Such a liquid crystal display device supplies a scanning signal and a data signal to an image display unit having a switching element,
It is necessary to connect a driving IC from the outside, but the following two methods are the mainstream. One is to press-connect, for example, a connection film having a large number of thin copper wires formed on a polyimide resin thin film base to terminals of scanning signal lines and terminals of data signal lines formed on one substrate constituting the liquid crystal display device. This is a so-called film carrier system that supplies signals from an external driving IC, and the other is a driving IC that is directly connected to mounting terminals formed around the image display section on one substrate that constitutes a liquid crystal display device Is a COG (chip-on-glass) method that implements

Most of the currently sold LCD televisions use the former film carrier method, but the 1-inch LCD panel used for video camera viewfinders and the like requires the latter COG method for high-density mounting. Is increasingly being adopted.

FIG. 4 shows an active type liquid crystal circuit using a conventional COG method. For example, a switching element 3 of a field effect transistor and a liquid crystal cell are provided on an insulating substrate 14 at each intersection of a scanning line 1 and a signal line 2. 4 are arranged. Reference numeral 5 denotes a counter electrode made of a transparent electrode layer common to all the liquid crystal cells 4. Reference numeral 6 denotes a driver driving line wired to supply a signal to the scanning line driving driver 13 and the signal line driving driver 12, and 9 denotes a driving driver from the wiring.
Wiring lines for connection to the input connection terminals 10 and 12 and wiring lines 8 for supplying signals to the wiring 6 for driving the driver. Reference numeral 7 denotes a mounting terminal group for supplying a signal from the outside. Reference numeral 11 denotes mounting for connecting the signal line driving driver 12 to the signal line 2 and mounting for connecting the scanning line driving driver 13 to the scanning line 1. Terminal.

FIG. 5 is an external perspective view of the liquid crystal circuit of FIG. Here, the color filter 15 bonded on the insulating substrate 14 is used.
A liquid crystal is sealed between the two and forms a screen. A driver IC 12 for driving a signal line and a driver IC 13 for driving a scanning line are mounted and connected to the signal line 2 and the scanning line 1, respectively. It is in pressure contact with the external signal supply terminal 7.

FIG. 6 is an enlarged view of the signal wiring driver 12 shown in FIG. 4, and FIG. 7 is an enlarged view of the signal wiring driver 12 shown in FIG.
FIG. 2 is a cross-sectional view when mounting is connected to an insulating substrate 14. Here, the driver IC input pad 10 'is mounted and connected to the driver IC input connection terminal 10, and the driver IC output pad 11' is mounted and connected to the driver IC output connection terminal 11.

FIG. 8 shows the actual situation of the driver driving wirings 6-a, b, c and the driver driving side extraction wirings 9-a, b, c when the driver IC input pads are arranged as shown in FIG. . Here, the driver driving lines 6-a, b, and c and the driver driving side lead-out lines 9-a, b, and c are electrically connected by contacts 17-a, b, and c, respectively. FIG. 9 is a sectional view taken along line BB 'of FIG. On the insulating substrate 14, the driver driving side extraction wirings 9-a, b, c are formed, and via the insulating layer 18, the driver driving wirings 6-a, b, c are formed.

However, in the above configuration, for example, the cross section between the driver driving wiring 6-a and the driver driving side lead-out wiring 9-c which should not be short-circuited via the insulating layer 18 is provided. Is inevitably caused, for example, a problem that a short circuit occurs between the driver driving wiring 6-a and the driver driving side lead-out wiring 9-c due to a foreign substance or a pinhole when the insulating layer 18 is formed. was there. Therefore, it is necessary to take measures to reduce foreign matter and dust by thoroughly cleaning in the manufacturing process and improving the atmosphere, but it is impossible to eliminate short-circuit failure as long as it has a structural cross structure. Had problems.

The present invention has been made in view of the above circumstances, and provides a liquid crystal display device having a structure that eliminates a cross structure between a driver driving input wiring group and a driver driving side extraction wiring.

Means for Solving the Problems In view of the above problems, the present invention has a driver driver IC input pad group arranged in the vertical direction with respect to the arrangement direction of the drive driver IC output pad groups.

Operation According to the present invention, it is possible to design a driver driving wiring having no cross structure between the driver driving wiring and the driver driving side take-out wiring by the above configuration.

FIG. 1 is a plan view showing a driver for driving a signal line of an active liquid crystal panel according to an embodiment of the present invention.
Similarly, FIG. 2 (a) shows the layout of the driver IC input pad group 10 'and the driver IC output pad group 11' of the signal line driver 12 in the case of FIG. Fig. 3 shows the first
It is a principal part enlarged view of the figure.

In this way, the driver IC input pad group 10 'is replaced with the driver IC output pad group 11' of the signal line driver IC 12.
8 are arranged in a vertical direction with respect to the arrangement direction, for example, a cross portion generated in FIG. 8, for example, a driver driving wiring 6-a and a driver driving side extraction wiring 9-c.
As shown in FIG. 3, the arrangement of the driver IC input connection terminal 10-c is performed in the vertical direction with respect to the arrangement direction of the driver output pad group 11 'of the signal line driver IC 12, as shown in FIG. 6-c can be eliminated.

The driver IC input pad group 10 'is shown in FIG.
The driver ICs 12 may be arranged around the center of the driver IC 12, as shown in FIG. 2, or may be arranged at an angle with respect to the arrangement direction of the driver IC output pad group 11 ', as shown in FIG. 2 (c).

Effect of the Invention As described above, according to the present invention, it is possible to eliminate the cross structure between the driver driving wiring of the active type liquid crystal panel substrate and the driver driving side lead-out wiring. It is possible to eliminate short-circuit defects with the drive-side lead-out wiring, and there is a great practical effect.

[Brief description of the drawings]

FIG. 1 is a plan view showing a driver for driving a signal line of an active type liquid crystal display device according to an embodiment of the present invention.
3 (a) to 3 (c) are layout diagrams of input / output pad groups of a driver IC, FIG. 3 is an enlarged view of a main part of FIG. 1, and FIG.
FIG. 5 is an external perspective view of the same device, FIG. 6 is an enlarged view of a main part of the same device, FIG. 7 is a cross-sectional view of a main part of the same device, FIG. 8 shows the sixth
9 is a cross-sectional view of a main part of FIG. 6 ... Driver drive wiring group, 6-a, 6-b, 6-c ...
Driver drive wiring, 10: Driver IC input connection terminal, 10-a, 10-b, 10-c: Driver IC input connection terminal, 10 ': Driver IC input pad, 11: Driver IC output connection terminal , 11 '…… Driver IC output pad,
12 ... Driver for driving signal lines.

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hirokazu Kawabata 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-56-70586 (JP, A) JP-A-61- 250672 (JP, A)

Claims (1)

(57) [Claims] A liquid crystal is sealed between a pair of substrates, a pixel electrode arranged in a matrix on one of the substrates, a thin film transistor connected in close proximity to the pixel electrode, and a thin film transistor of the thin film transistor. A signal wiring connected to a source electrode, and a scanning wiring connected to a gate electrode of the thin film transistor; and, on the substrate to supply a signal to the signal wiring and the scanning wiring on the substrate. In a liquid crystal display device having a driving driver IC connected to a COG (chip-on-glass), a plurality of input pads on the driving driver IC are arranged in a direction in which a plurality of output pads on the driving driver IC are arranged. A liquid crystal display device comprising a driving driver IC in which the input pads are arranged in a substantially right angle direction.