JP2760413B2 - Liquid crystal display device - Google Patents

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 (hereinafter referred to as "L").
More specifically, the present invention relates to a sealing material interposed between a pair of electrode substrates.

[0002]

2. Description of the Related Art As shown in the plan view of FIG. 3, a conventional general LCD has four sides of substantially the same width between a pair of upper and lower electrode substrates 1 and 2 having transparent electrodes patterned on opposing surfaces. Seal material 3 applied in a frame shape composed of a band-shaped portion
The two electrode substrates 1 and 2 are provided with the sealing material 3.
Are stacked and fixed. In addition, both electrode substrates 1
Liquid crystal is sealed in a space inside the seal member 3 between the two, and one side end of the lower electrode substrate 2 extending outside the seal member 3 serves as a terminal portion 4. A group of electrode terminals 5 made of ITO or the like extended from the transparent electrode is formed on the terminal portion 4. After connecting each electrode terminal 5 to an external terminal, a reinforcing resin is applied to the terminal portion 4. To ensure the necessary connection strength. That is, when a flexible substrate for external connection is fixed to such an LCD, a metal film 6 of Ag or the like is provided on the electrode terminals 5 of the terminal portion 4 as shown in a sectional view of a main part of FIG. After applying solder 9 between the copper foil pattern 8 of the flexible substrate 7 and thermocompression bonding,
The upper and lower electrode substrates 1 and 2 and the flexible substrate 7 are integrated by applying and curing a reinforcing resin 10 such as an ultraviolet curable resin on the terminal portion 4. Note that an anisotropic conductive sheet may be used instead of using the solder 9.

[0003]

By the way, such LC
The reinforcing resin 10 applied to the terminal portion 4 of D shrinks during curing, and the tensile force due to this shrinkage acts on one edge of the upper electrode substrate 1 as shown by an arrow A in FIG. As shown by a chain line in FIG.
As a fulcrum, the upper electrode substrate 1 is likely to bend in the vicinity of the sealing material 3, and as a result, the gap d between the two electrode substrates 1 and 2 is locally increased in the effective display area inside the sealing material 3. As a result, color unevenness is caused to deteriorate display quality. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an LCD which solves the above-mentioned problems of the prior art and which does not cause color unevenness due to shrinkage of a reinforcing resin applied to a terminal portion.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide, among frame-shaped sealing materials provided between a pair of electrode substrates, a band-shaped portion to which a reinforcing resin is applied is opposed to the band-shaped portion .
This is achieved by making it wider than other strips.

[0005]

Even if a tensile force is applied to one edge of the electrode substrate due to shrinkage of the reinforcing resin, if the corresponding portion of the electrode substrate is fixed to a wide sealing material, it is unlikely to bend, and the sealing material is hardly bent. The gap between the pair of electrode substrates can be kept constant in the inner effective display area.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a plan view of an LCD according to the present embodiment, and FIG. 2 is a cross-sectional view of a main part showing a state in which a flexible substrate is fixed to a terminal portion of the LCD, which corresponds to FIGS. The same reference numerals are given to the same parts, and the overlapping description will be appropriately omitted. As is clear from FIG. 1, the LCD according to the present embodiment has one side of the terminal portion 4 side of the sealing member 3 applied between the pair of upper and lower electrode substrates 1 and 2 in a frame shape. The width of the strips 3a, 3b, 3c constituting the three sides is set to about 1 mm, which is the same as that of the conventional product. Belt portion 3 applied to a position facing reinforcing resin 10
The width dimension of d is set to about 2 mm. In this embodiment, an epoxy resin is used as the sealing material 3. Therefore, as shown in FIG. 2, after connecting the electrode terminals 5 of the terminal portions 4 of the LCD and the copper foil pattern 8 of the flexible substrate 7 via the metal film 6 such as Ag or the solder 9,
When a reinforcing resin 10 such as an ultraviolet curable resin is applied to the terminal portion 4 and cured (shrinked), even if a pulling force indicated by an arrow A in the drawing acts on one edge of the upper electrode substrate 1, Seal material 3
The upper portion of the upper electrode substrate 1 whose position is widely regulated by the band-shaped portion 3d is less likely to be bent.
In other words, since the band portion 3d is wide, the deflection of the upper electrode substrate 1 with the band portion 3d as a fulcrum is so small that it can be neglected. Can be kept constant.

As described above, in the above embodiment, the width of the band-shaped portion 3d of the sealing material 3 is increased so that the bending of the upper electrode substrate 1 due to the contraction of the reinforcing resin 10 is suppressed. Since the gap between the electrode substrates 1 and 2 can be kept constant even when the electrode 7 is fixed, color unevenness can be avoided and good display quality can always be expected. Moreover, since it is only necessary to make the band-shaped portion 3d of the sealing material 3 wider than the other three sides, the manufacturing process is not complicated and there is no concern about cost increase. It is needless to say that the present invention can be applied to a case where an anisotropic conductive sheet is used instead of the solder 9 or a case where a metal terminal is used as an external terminal.

[0008]

As described above, the LCD according to the present invention
Of the frame-shaped sealing material interposed between the pair of electrode substrates faces the band-shaped portion to which the reinforcing resin is applied .
By making the width wider than that of the other band-shaped portions, the bending of the electrode substrate due to the shrinkage of the reinforcing resin can be suppressed, so that the gap between the pair of electrode substrates can be kept constant in the effective display area. Therefore, it is possible to avoid the color unevenness which has been a factor of deteriorating the display quality, and to achieve an excellent effect that the cost is not increased.

[Brief description of the drawings]

FIG. 1 is a plan view of an LCD according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a state where a flexible substrate is fixed to a terminal of the LCD shown in FIG.

FIG. 3 is a plan view of an LCD according to a conventional example.

FIG. 4 is a cross-sectional view of a main part showing a state where a flexible substrate is fixed to a terminal of the LCD shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper electrode substrate 2 Lower electrode substrate 3 Sealing material 3a, 3b, 3c, 3d Strip part 4 Terminal part 5 Electrode terminal 7 Flexible substrate 8 Copper foil pattern 10 Reinforcement resin

Claims (1)

(57) [Claims] Liquid crystal inside the sealing material is enclosed claim 1] between the first and second electrode substrates which are stacked and fixed through a seal material applied to frame shape, provided outside of the sealing material External terminals are laminated and conductive on the terminal portion of the second electrode substrate.
And the laminated portion and the end of the first electrode substrate.
In a liquid crystal display element that is integrated with the external terminal by applying and curing a reinforcing resin to a portion including
A liquid crystal display element characterized in that a band-shaped portion of the sealing material to which the reinforcing resin is applied is wider than other band-shaped portions facing the band-shaped portion .