JPH0990399A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drastically lessen the disconnection of electrode lead terminals by foreign matter. SOLUTION: Dummy color filters 20 are formed at prescribed intervals atop a lower substrate 3 facing the part near the cutting point existing on the outer side of a sealing material of the upper substrate of the color liquid crystal display device constituted by sealing liquid crystals via the sealing material between a pair of the upper and lower substrates. Insulating protective films 9 are formed to cover these dummy color filters 20 and the electrode lead terminals 12 are formed at a prescribed pitch on the insulating protective films 9 between the dummy color filters 20. Then, the front surfaces of the electrode lead terminals 12 are formed lower than the front surface of the insulating protective films 9 corresponding to the surfaces of the dummy color filters 20 and, therefore, even if the foreign matter, such as glass powder generated at the time of cutting the upper substrate, sticks thereon, the damage of the electrode lead terminals 12 by such foreign matter is lessened and the disconnection of the electrode lead terminals 12 is drastically lessened.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art Conventional liquid crystal display devices include STN type color liquid crystal display devices that display color images. FIG. 5 is a diagram showing an example of this color liquid crystal display device. This color liquid crystal display device includes a liquid crystal cell 1. The liquid crystal cell 1 includes a pair of upper and lower substrates 2 and 3 made of glass or the like.
The pair of substrates 2 and 3 are opposed to each other at a predetermined interval (about several μm) by a frame-shaped sealing material 4 interposed between the peripheral portions of the pair of substrates 2 and 3. 3 has a structure in which the liquid crystal 5 is enclosed in a region surrounded by 3 and the sealing material 4. In this case, among the facing surfaces of the pair of substrates 2 and 3, the electrode 6 made of a transparent conductive material such as ITO is provided on the lower surface of the upper substrate 2 in the figure.
And the upper alignment film 7 is formed so as to cover the electrode 6. A color filter 8 is formed on the upper surface of the lower substrate 3 so as to correspond to each pixel, and an insulating protective film 9 is formed so as to cover the color filter 8. An electrode 10 made of the same material as the electrode 6 of the upper substrate 2 is formed on the upper surface of the so as to correspond to the color filter 8, and a lower alignment film 11 is formed so as to cover these electrodes 10. An insulating protective film 9 drawn from the inside is provided on the upper surface of the lower substrate 3 located outside the sealing material 4, and the insulating protective film 9 is shown on the insulating protective film 9 in FIGS. 6 and 7. Electrode lead terminal 12 pulled out to the outside of the sealing material 4
Are formed in parallel at a predetermined pitch. The liquid crystal cell 1
Polarizing plates (not shown) are provided on the upper and lower surfaces, respectively.

[0003]

By the way, in such a color liquid crystal display device, the productivity is poor if the liquid crystal cells 1 are individually manufactured one by one. Therefore, a plurality of large glass plates are actually used. A plurality of cell containers are obtained at one time by laminating the liquid crystal cells 1 through the sealing material 4 and cutting each region corresponding to each liquid crystal cell 1. In this case, in order to obtain one independent liquid crystal cell 1, the electrode lead terminal 12
Since it is necessary to expose almost the entire area of the above, as shown in FIG. 5, the upper substrate 2 facing the electrode lead terminals 12 is cut at a cutting point S outside the sealing material 4. But,
When the upper substrate 2 is cut in this manner, foreign substances such as glass powder and cullet (fragment) are generated at the time of cutting, and these foreign substances adhere to the electrode lead terminals 12, and these foreign substances are used at the time of cutting and in the subsequent steps. There is a risk that the lead terminal 12 may be damaged and the electrode lead terminal 12 may be broken. An object of the present invention is to make it possible to significantly reduce disconnection of an electrode lead terminal due to foreign matter.

[0004]

According to the first aspect of the present invention,
In a liquid crystal display device in which liquid crystal is sealed by a sealing material interposed between a pair of substrates each having electrodes formed on opposite surfaces, the sealing material interposed between the substrates is drawn to the outside of the sealing material on one substrate. Electrode lead terminals were installed in parallel at a predetermined pitch, and an insulating layer was formed higher than the electrode lead terminals between the electrode lead terminals of the substrate on which the electrode lead terminals were installed. Therefore, foreign substances such as glass powder are supported by the insulating layer, so that the foreign substances are less likely to damage the electrode lead terminals, and thus the disconnection of the electrode lead terminals can be significantly reduced. In this case, as described in claim 2, the liquid crystal display device is a color liquid crystal display element that performs color display by a color filter, and if the insulating layer is made of the same material as the color filter, the insulating layer is a color filter. Since they can be formed at the same time, the thickness of the insulating layer can be easily made larger than that of the electrode lead terminals without increasing the number of manufacturing steps.

According to a third aspect of the present invention, there is provided a liquid crystal display device in which a liquid crystal is sealed between a pair of substrates having electrodes formed on opposite surfaces thereof with a sealing material interposed between peripheral portions thereof. , The electrode lead terminals drawn out to the outside of the sealing material are formed in parallel on one substrate at a pitch that does not electrically short-circuit with each other, and the electrode lead terminals are arranged at both ends in the width direction along the arrangement direction. Formed lower than. Therefore, even if both ends of the electrode lead terminal are damaged by foreign matter such as glass powder, the central part of the electrode lead terminal is less likely to be damaged, the electrode lead terminal is less likely to be broken, and the electrode lead terminal is greatly disconnected. Can be reduced to In this case, as described in claim 4, the liquid crystal display device is a color liquid crystal display element which performs color display by a color filter, and both end portions in the width direction of the electrode lead terminal are made of the same material as the color filter. By stacking them on top of each other, the insulating layer can be formed at the same time as the color filter, as in the second aspect of the invention. Therefore, the central portion of the electrode lead terminal can be easily formed from both ends without increasing the number of manufacturing steps. Can be formed low.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a liquid crystal display device of the present invention will be described below with reference to the drawings. [First Embodiment] First, a first embodiment in which the present invention is applied to a color liquid crystal display device will be described with reference to FIGS. The same parts as those of the conventional example shown in FIGS. 5 to 7 are designated by the same reference numerals, and the description thereof will be omitted. In this color liquid crystal display device, as shown in FIGS. 1 and 2, on the upper surface of the lower substrate 3 outside the sealing material 4,
Dummy color filters 20 which are not used as color filters are formed in parallel at predetermined intervals in the vicinity of the cut portion S of the upper substrate 2, and an insulating protective film 9 is formed so as to cover these dummy color filters 20. There is.
Then, on the upper surface of the insulating protective film 9, electrode lead terminals 12 drawn out from the sealing material 4 to the outside are formed in parallel at a predetermined pitch so as to correspond between the dummy color filters 20. In this case, the electrode lead terminal 12 has a film thickness of several hundred to several thousand angstroms, the dummy color filter 20 has a film thickness of 1 to 3 μm, and the insulating protective film 9 is formed to have a substantially uniform thickness. There is. Therefore, in this color liquid crystal display device, the height from the upper surface of the lower substrate 3 to the upper surface of the electrode lead terminal 12 is determined by the dummy color filter 2
The structure is formed so as to be lower than the height of the upper surface of the insulating protective film 9 located above 0.

In such a color liquid crystal display device, when the upper substrate 2 is cut at the cutting point S, foreign substances such as glass powder are generated, and even if these foreign substances adhere to the lower substrate 3. Since the height from the upper surface of the lower substrate 3 to the upper surface of the electrode lead terminal 12 is formed lower than the height of the upper surface of the insulating protective film 9 located on the dummy color filter 20, this occurs at the time of cutting. Foreign matter has a high insulating protection film 9
Although it is placed on the electrode lead terminal 12,
Therefore, disconnection of the electrode lead terminal 12 can be significantly reduced. Further, in this color liquid crystal display device, the dummy color filter 20 is formed simultaneously with the pixel color filter 8, the dummy color filter 20 is covered with the insulating protective film 9, and the electrode lead terminal 12 is provided on the insulating protective film 9. Since it is formed, the upper surface of the electrode lead terminal can be easily formed lower than the upper surface of the insulating protective film 9 corresponding to the dummy color filter 20 without increasing the number of manufacturing steps.

[Second Embodiment] Next, a second embodiment in which the present invention is applied to a color liquid crystal display device will be described with reference to FIGS. 3 and 4. In this case, the same parts as those of the first embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted. In this color liquid crystal display device, on the upper surface of the lower substrate 3 outside the sealing material 4,
As shown in FIGS. 3 and 4, dummy color filters 20 are formed in parallel at predetermined intervals in the vicinity of the cut portion S of the upper substrate 2, and an insulating protective film is formed to cover these dummy color filters 20. 9 is formed.
Then, on the upper surface of the insulating protective film 9, electrode lead terminals 25, which are drawn out from the sealing material 4 to the outside, are formed in parallel with each other between the dummy color filters 20 at a predetermined pitch. In this case, the electrode lead terminals 25 near the cut portion S of the upper substrate 2 are formed to have a large width in the arrangement direction, and both ends 25a of the electrode lead terminals 25 in the width direction correspond to the dummy color filter 20. It is laminated on the insulating protective film 9 with a necessary gap, that is, a gap that can surely prevent a short circuit between the adjacent electrode lead terminals 25. Therefore, in this color liquid crystal display device, the central portion 25b in the width direction of the electrode lead terminal 25 near the cut portion S of the upper substrate 2 is lower than the end portions 25a in the width direction by the thickness of the dummy color filter 20. It has a structure formed by denting.

In such a color liquid crystal display device, when the upper substrate 2 is cut at the cutting point S, foreign substances such as glass powder are generated, and even if these foreign substances adhere to the lower substrate 3 side. The width of the electrode lead terminal 25 in the vicinity of the cutting point S is formed to be wide, and the central portion 25b in the width direction thereof is larger than the end portions 25a in the width direction of the dummy color filter 20.
Since the thickness of the electrode lead terminal 25 is reduced by the thickness of the electrode lead terminal 25, even if both ends 25a of the electrode lead terminal 25 are damaged by foreign matter attached at the time of cutting, the central portion 25b of the electrode lead terminal 25 is not easily damaged. 25 is less likely to be disconnected, and the disconnection of the electrode lead terminal 25 can be significantly reduced. Further, in this color liquid crystal display device, the dummy color filter 20 is formed simultaneously with the pixel color filter 8, the dummy color filter 20 is covered with the insulating protective film 9, and the electrode lead terminal 25 is formed on the insulating protective film 9. Since it is formed, similarly to the first embodiment, the widthwise central portion 25b of the electrode lead terminal 25 near the cutting point S is formed lower than both widthwise end portions 25a without increasing the number of manufacturing steps. can do.

In the second embodiment, an insulating protective film 9 covering the dummy color filter 20 is formed on the upper surface of the lower substrate 3, and the electrode lead terminal 2 is formed on the insulating protective film 9.
5 is not limited to this, the electrode lead terminal 25 is directly formed on the upper surface of the lower substrate 3 without forming the insulating protective film 9, and both end portions 25a of the electrode lead terminal 25 are formed. They may be formed on the dummy color filter 20 while being insulated from each other. Further, in the first and second embodiments described above, the case where the present invention is applied to the color liquid crystal display device has been described, but the present invention is not limited to this and can be applied to a liquid crystal display device that does not use a color filter. In this case, pedestals corresponding to dummy color filters are formed at predetermined intervals on the facing surface of the other substrate facing the vicinity of the cut portion of one substrate, and the pedestal is covered with the insulating protective film 9. Then, the electrode lead terminals may be formed on the insulating protective film 9, and after forming the insulating protective film 9,
A pedestal portion made of an insulating material corresponding to a dummy color filter is formed on the insulating protection film 9 at predetermined intervals, and the upper surface of the insulating protection film 9 located between the insulating pedestal portions or the upper surface of the insulating protection film 9 is insulated from the insulating pedestal. The electrode lead terminals may be formed over the portion.

[0011]

As described above, according to the first aspect of the invention, the upper surface of the insulating layer formed between the electrode lead terminals is higher than the upper surface of the electrode lead terminals formed in parallel at a predetermined pitch. Therefore, even if foreign matter such as glass powder adheres,
The foreign matter is less likely to damage the electrode lead terminal, and thus the breakage of the electrode lead terminal can be significantly reduced. According to the third aspect of the present invention, the electrode lead terminals are formed in parallel with a gap that does not electrically short-circuit with each other, and the central portion of each electrode lead terminal in the width direction along the arrangement direction of the electrode lead terminals is widened. Since it is formed lower than both ends in the direction, even if both ends of the electrode lead terminal are damaged by foreign matter such as adhered glass powder, the center part of the electrode lead terminal is less likely to be damaged and the electrode lead terminal can be disconnected. Therefore, disconnection of the electrode lead terminals can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a first example in which the present invention is applied to a color liquid crystal display device.
The principal part enlarged plan view which shows the electrode lead terminal vicinity of embodiment.

2 is a perspective view taken along the line AA of FIG.

FIG. 3 is a second example in which the present invention is applied to a color liquid crystal display device.
The principal part enlarged plan view which shows the electrode lead terminal vicinity of embodiment.

FIG. 4 is a perspective view taken along line BB in FIG.

FIG. 5 is a sectional view of a main part of a conventional color liquid crystal display device.

FIG. 6 is a plan view of a principal part showing the vicinity of the electrode lead terminal of FIG.

FIG. 7 is a perspective view taken along the line CC of FIG.

[Explanation of symbols]

 1 Liquid Crystal Cell 2 Upper Substrate 3 Lower Substrate 4 Sealing Material 5 Liquid Crystal 6, 10 Electrode 9 Insulation Protective Film 20 Dummy Color Filter 12, 25 Electrode Lead Terminal 25a Both Ends of Electrode Lead Terminal 25b Central Area of Electrode Lead Terminal

Claims (4)

[Claims] 1. A liquid crystal display device in which liquid crystal is sealed between a pair of substrates having electrodes formed on opposite surfaces by a sealing material interposed between peripheral portions of the substrates. The electrode lead terminals pulled out to the outside of the material are installed in parallel at a predetermined pitch, and an insulating layer is formed higher than the electrode lead terminals between the electrode lead terminals of the substrate on which the electrode lead terminals are installed. Characteristic liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a color liquid crystal display element that performs color display with a color filter, and the insulating layer is made of the same material as the color filter. 3. A liquid crystal display device in which liquid crystal is sealed between a pair of substrates having electrodes formed on opposite surfaces by a sealing material interposed between peripheral portions of the substrates, wherein the one substrate has the seal. The electrode lead terminals drawn out to the outside of the material are formed in parallel at a pitch that does not electrically short-circuit with each other, and the electrode lead terminals are formed so that the center portion in the width direction along the arrangement direction is lower than both end portions in the width direction. A liquid crystal display device characterized by the following. 4. The liquid crystal display device is a color liquid crystal display element that performs color display using a color filter, and both widthwise ends of the electrode lead terminal are laminated on an insulating layer made of the same material as the color filter. The liquid crystal display device according to claim 3, wherein: