JP2000002880A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further uniformize a cell gap in peripheral part of a display region. SOLUTION: The liquid crystal display is equipped with various wiring such as an outgoing line 25, 27a, 27b, 27c or the like which intersects a sealant 22 on the outside of the display region existing on the upper plane of the lower side substrate 21. Besides, the widths of the sealant 22 at the parts intersecting with outgoing lines such as 25 are narrower than those at the parts not intersecting. Thereby it is possible to further uniformize a cell gap in peripheral part of the display region 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device capable of achieving a more uniform cell gap at a peripheral portion of a display area.

[0002]

2. Description of the Related Art FIG. 3 is a plan view showing an example of a conventional liquid crystal display device. In this liquid crystal display device, a lower substrate 1 and an upper substrate 2 are bonded together with a spacer (not shown) having a predetermined diameter interposed therebetween via a substantially rectangular frame-shaped sealing material 3. A liquid crystal (not shown) is sealed between the two substrates 1 and 2 inside 3. In this case, a region indicated by a dashed line inside the sealing material 3 is a display region 4. Also, the lower substrate 1
Are protruded from the upper substrate 2 and the protruding portions 1
A scanning line driving semiconductor chip 5 and a signal line driving semiconductor chip 6 are mounted on the upper surfaces of a and 1b.

By the way, for example, various wirings are provided outside the display area 4 on the upper surface of the lower substrate 1 so as to intersect with the sealing material 3. For example, in the vicinity of the protruding portions 1a and 1b, lead lines such as scanning lines and signal lines provided in the display area 4 intersect with the sealing material 3, although not shown. As shown in FIG. 4 in which a part of the lower substrate 1 is enlarged, a lead wire 12 extending from the display region 4 and connected to a cross material connection pad 11 provided outside a corner of the sealing material 3. Are provided so as to intersect with the sealing material 3. The cross material connection pad 11 is formed on a cross material connection pad (not shown) provided at a predetermined location on the lower surface of the upper substrate 2 by a columnar cross material 13 made of a conductive paste or the like.
Are electrically conductively connected to each other. In addition, a lead wire 14 extending from the display area 4 and connected to a power supply line (not shown) for anodizing a scanning line or the like is provided to intersect with the sealing material 3. Note that the lead wires 12 and 14 are covered with the overcoat film 15 and the cross material connection pads 11
Are exposed without being covered by the overcoat film 15. The sealing material 3 is provided on the upper surface of the overcoat film 15.

[0004]

As described above, in the conventional liquid crystal display device, for example, various wirings such as lead lines 12 and 14 intersect with the sealing material 3 outside the display area 4 on the upper surface of the lower substrate 1. It is provided. Therefore, the surface of the overcoat film 15 at the portion where the sealing material 3 and the wiring intersect is higher than the surface of the overcoat film 15 at the portion where the sealing material 3 and the wiring do not intersect by the thickness of the wiring. Has become. On the other hand, the height of the sealing material 3 itself before bonding the substrates 1 and 2 is substantially constant.
Therefore, when the substrates 1 and 2 are bonded together with the sealing material 3 interposed therebetween, the portion of the sealing material 3 that intersects with the wiring is more strongly compressed than the portion that does not intersect with the wiring, and the repulsive force of this strongly compressed portion is different. Will be larger than the part. As a result, the cell gap near the portion where the sealing material 3 intersects with the wiring is larger than the cell gap near the portion where the sealing material 3 does not intersect with the wiring. And the display quality is degraded. SUMMARY OF THE INVENTION It is an object of the present invention to further uniform the cell gap at the periphery of a display area.

[0005]

According to the present invention, two substrates are bonded together via a sealing material, and wiring is provided around at least one of opposing surfaces of the two substrates by the sealing material. In the liquid crystal display device provided to intersect with,
The width of a portion of the sealing material that intersects with the wiring is smaller than the width of a portion that does not intersect with the wiring. According to the present invention, the width of the portion of the seal material that intersects with the wiring is made smaller than the width of the portion that does not intersect with the wiring, so that the portion of the seal material that intersects with the wiring is compressed more strongly than the portion that does not intersect with the wiring. Even so, the repulsion force of this strongly compressed portion can be made not to be much larger than that of the other portions, so that the cell gap at the peripheral portion of the display area can be made more uniform. .

[0006]

FIG. 1 is a plan view showing a main part of a lower substrate of a liquid crystal display device according to an embodiment of the present invention. This liquid crystal display device has a substantially rectangular frame shape with a lower substrate 21 made of a glass plate, a resin film, or the like and an upper substrate (not shown) interposed with a spacer (not shown) having a predetermined diameter therebetween. And a liquid crystal (not shown) is sealed between the two substrates 21 inside the sealing material 22. Also in this case, the area indicated by the dashed line inside the sealing material 22 is the display area 23. Note that the width of the sealing material 22 is not constant but is reduced at a predetermined position, which will be described later.

The display area 23 on the upper surface of the lower substrate 21
Various wirings are provided crossing the seal member 22 outside the box. Here, those shown in FIG. 1 will be described. A lead wire 25 extending from the display area 23 and connected to the cross material connection pad 24 provided outside the corner of the seal material 22 is provided to intersect the seal material 22. The cross material connection pad 24 is conductively connected to a cross material connection pad (not shown) provided at a predetermined location on the lower surface of the upper substrate via a columnar cross material 26 made of a conductive paste or the like. In addition, lead lines 27 a, 27 b, and 27 c extending from the display area 23 and connected to power supply lines (not shown) for anodizing scanning lines and the like (not shown) are provided to intersect with the sealing material 22. In this case, the lead wire 27
The width of a is smaller than the width of the leader line 25, and the width of the leader line 27b,
It is larger than the width of 27c. Further, one lead line 27a, 27b is coarsely arranged, but six lead lines 27c are densely arranged. Leader 2
5, 27a, 27b, and 27c are covered with the overcoat film 28, and the cloth material connection pads 24 are exposed without being covered with the overcoat film 28. The sealing material 22 is provided on the upper surface of the overcoat film 28.

Next, the width of the sealing member 22 will be described. A trapezoidal notch 31 is provided inside a portion of the sealing material 22 that intersects with the lead line 25. Seal material 22
A trapezoidal cutout portion 32 is provided outside and inside of a portion intersecting with the lead lines 27a and 27b. Seal material 2
The trapezoidal cutouts 33 are continuously provided outside and inside the portion that intersects the two six lead lines 27c. As described above, the lead lines 25, 27 a, 27
Since the notches 31, 32, and 33 are provided at portions that intersect with b and 27c, the lead lines 25, 27a,
The width at the portion that intersects 27b and 27c is represented by the lead line 2.
5, 27a, 27b, and 27c are smaller than the width at a portion that does not intersect. As a result, the height of the sealing material 22 itself before bonding the two substrates 21 is substantially constant, and when the two substrates 21 are bonded via the sealing material 22, the lead lines 25, 27a, 27b of the sealing material 22 are formed. , 27
Even if a portion that intersects with the wiring such as c is more strongly compressed than a portion that does not intersect with the wiring, it is possible to prevent the repulsion force of this strongly compressed portion from being much greater than other portions, thereby displaying The cell gap at the peripheral portion of the region 23 can be made even more uniform.

[0009] For example, the lead wire 27a of the sealing material 22
The shape at the portion that intersects with is not limited to the case shown in FIG. For example, as shown in FIG.
An arc-shaped notch 32 may be provided on the outside and inside of a portion of the sealing material 22 that intersects with the lead line 27a. FIG.
As shown in (B), an obtuse angled isosceles triangular notch 32 may be provided on the outside and inside of the portion of the sealing material 22 that intersects the lead line 27a. Further, as shown in FIG. 2 (C), a rectangular cutout 32 may be provided outside and inside a portion of the sealing material 22 that intersects with the lead line 27a. Further, as shown in FIG.
The rectangular notch 32 may be provided only inside the portion that intersects 7a. Further, a spacer made of a small piece of glass fiber or the like may be mixed in the sealing material 22.
In this case, the number of spacers mixed in a portion of the sealing material 22 that intersects with the lead-out line 27a or the like can be reduced by an amount corresponding to the reduced width of the sealing material 22. This can contribute to further uniformity of the cell gap of the portion.

[0010]

As described above, according to the present invention, the width of the portion of the sealing material that intersects with the wiring is smaller than the width of the portion that does not intersect with the wiring.
Even if the part of the seal material that intersects with the wiring is compressed more strongly than the part that does not intersect with the wiring, the resilience of this strongly compressed part can be made not to be much greater than other parts, and this can be displayed. The cell gap at the peripheral portion of the region can be made even more uniform.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a lower substrate of a liquid crystal display device according to an embodiment of the present invention.

FIGS. 2A to 2D are plan views each showing a modification of a sealing material.

FIG. 3 is a plan view of an example of a conventional liquid crystal display device.

4 is an enlarged plan view of a part of a lower substrate of the liquid crystal display device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Lower board 22 Sealing material 23 Display area 25, 27a, 27b, 27c Leader 31, 32, 33 Notch

Claims (2)

[Claims] 1. A liquid crystal in which two substrates are bonded together via a sealing material, and wiring is provided around at least one of opposing surfaces of the two substrates so as to intersect the sealing material. The liquid crystal display device according to claim 1, wherein a width of the sealing material at a portion that intersects with the wiring is smaller than a width at a portion that does not intersect with the wiring. 2. The liquid crystal display device according to claim 1, wherein a spacer is mixed in the sealing material.