JPH04324825A - Liquid crystal display element and manufacture thereof - Google Patents

Abstract

PURPOSE:To make uniform displaying over the whole panel surface of a liquid crystal display element embodying the simple matrix system, especially in an element in which electric continuity is required from one of the base boards to the other. CONSTITUTION:A spacer 7 is inserted to a seal 6 overlapped on the part where a drawout electrode 9 is formed, while a spacer 13 is inserted in another seal 12 overlapping on the other parts, wherein the dia. of the spacer 13 shall be greater than that of the spacer 7 by an amount corresponding to the film thickness of the drawout electrode. This permits producing uniform base board holding spacing over the whole panel surface to allow accomplishing uniform displaying of high grade.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a simple matrix type liquid crystal display element, and more particularly to a liquid crystal display element that requires electrical continuity from one substrate to another, and a method for manufacturing the same. .

0002

2. Description of the Related Art In recent years, with the miniaturization of information equipment such as word processors and computers, there has been a strong desire for displays, which are key components, to be thinner, lighter, and consume less power. Flat displays include plasma and EL
There are devices using liquid crystal display elements, but liquid crystal display elements are superior in terms of thinness, light weight, low power consumption, and color display, and are widely used in laptop computers and other applications.

A conventional liquid crystal display element that provides electrical continuity from one substrate to another will be described below with reference to the drawings.

FIGS. 7(a) and 7(b) show cross-sectional views of the configuration of each terminal portion of a conventional liquid crystal display element. A scanning electrode 3 is formed on a scanning electrode substrate 1, and a signal electrode 4 and an extraction electrode 9 for the scanning electrode 3 are formed on a signal electrode substrate 2, and a sealing resin 6 is printed on one of these substrates. Both substrates are bonded together with the alignment film 5 sandwiched therebetween so that the scanning electrode 3 and the signal electrode 4 are at right angles. After this LCD 16
is injected to form a liquid crystal display element. The scanning electrode 3 is connected to the signal electrode substrate 2 by conductive particles 8 mixed into the sealing resin 6.
It is electrically connected to the upper extraction electrode 9, and all external connection terminal electrodes are formed on one side of the substrate (signal electrode substrate 2).

[0005]

[Problems to be Solved by the Invention] In liquid crystal display elements such as STN liquid crystal that require high display quality, it is necessary to reduce the thickness variation of the liquid crystal layer by ±0.05 μm in order to achieve a uniform display.
It is necessary to control the following. However, in the above-mentioned conventional configuration, the thickness of the liquid crystal layer held by the spacer mixed in the sealing material is limited to the thickness of the extraction electrode (approximately 0.2 μm ) It was different.

[0006] As described above, in the conventional structure, since the liquid crystal layer includes the extraction electrode, thickness unevenness occurs in the liquid crystal layer, and uniform display cannot be achieved.

The present invention solves the above-mentioned conventional problems and aims to provide a liquid crystal display element with high display uniformity.

[0008]

[Means for Solving the Problem] A liquid crystal layer surrounded by a sealant containing spacers is sandwiched between a signal electrode substrate having a plurality of signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes. , having extraction electrodes on one of the substrates, the extraction electrodes being configured at positions corresponding to the electrodes of the opposing substrates with the sealing material interposed therebetween, and conductive particles being mixed into the sealing material. A liquid crystal display element is constructed by electrically connecting the extraction electrode and an electrode on the opposing substrate, and a spacer mixed in the seal is used separately for the area with the extraction electrode and the other area, or the extraction By providing a thin film with a predetermined pattern corresponding to the thickness of the extraction electrode so that it overlaps with the sealing material other than the part that overlaps the electrode, and by making the spacing between the substrates held the same, the thickness of the liquid crystal layer during sealing can be reduced to the entire thickness. The parts are made equal.

[0009]

[Operation] According to the present invention, spacers in the sealing material are selectively used in the area with the extraction electrode and other areas, or a thin film corresponding to the thickness of the extraction electrode is provided to uniformly maintain the spacing between the substrates held. By doing so, the thickness of the liquid crystal layer sandwiched between the substrates can be made equal in all parts, regardless of the presence or absence of the extraction electrode overlapping the sealing material. Thereby, display unevenness due to uneven thickness of the liquid crystal layer does not occur, and a liquid crystal display element with uniform and high display characteristics can be provided.

0010

【Example】

(Embodiment 1) Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same numbers are written for the same parts from (FIG. 1) to (FIG. 7).

(FIG. 1(a)) and (FIG. 1(b)) are conceptual plan views of the electrode substrate in Example 1 of the present invention, (FIG. 2(a)
)) and (FIG. 2(b)) respectively show structural cross-sectional views of the lead electrode terminal portion and the signal electrode terminal portion of the liquid crystal display element in Example 1.

As shown in the figure, first, 100 wt % of thermosetting epoxy resin was applied to the scanning electrode substrate 1 as a sealing material 12.
Spacer 13 (average particle size 7.2 μm) for maintaining electrode gap inside
A mixture of 1.5 wt % of glass fiber) was printed using a screen printing method so as not to overlap the extraction electrode group 9. On the opposing signal electrode substrate 2, a spacer 7 for maintaining an electrode gap is placed in a thermosetting epoxy resin as a sealing material 6.
1.5 wt% of (glass fiber with an average particle size of 7.0 μm) and 1 portion of conductive particles 8 (polystyrene particles with an average particle size of 7.25 μm with a gold plating layer of 0.1 μm thick on the surface)
．． The material containing 0 wt% was printed by screen printing so as to overlap with the extraction electrode group 9.

Next, the two electrode substrates are bonded together by sandwiching the alignment film 5 and an appropriate spacer (polystyrene crosslinked polymer or glass fiber: not shown), and the sizes of the spacer 7 and conductive particles 8 are determined. The conductive particles 8 are compressed under pressure until they become equal.
After electrical continuity between the upper and lower electrodes is established by
Cure 2 and 6. Through this step, the scanning electrode group 3 and the extraction electrode group 9 provided on the signal electrode substrate 2 are electrically connected to each other. Thereafter, liquid crystal 16 was injected into the gap between electrode substrates 1 and 2 surrounded by sealants 6 and 12, and then liquid crystal injection port 10 was sealed with ultraviolet curing resin to produce a liquid crystal display element.

[0014] When the lighting display of the liquid crystal display element manufactured as described above was evaluated, it was confirmed that a liquid crystal display element with high uniformity without display unevenness over the entire panel including the vicinity of the seal was manufactured. It was done. However, such a homogeneous display could not be obtained when a 7.0 μm spacer was used in each sealing portion as in the conventional case.

(Example 2) (FIG. 3(a)), (FIG. 3(b)
)) are conceptual plan views of an electrode substrate constituting a liquid crystal display element in Example 2 of the present invention, (FIG. 4(a)), (FIG. 4(b)
)) respectively show structural cross-sectional views of the extraction electrode terminal portion and the signal electrode terminal portion of the liquid crystal display element in Example 2.

First, discontinuous dummy electrodes 14 were provided on both electrode substrates so as to overlap with the sealing material 6 except for the portions overlapping with the extraction electrode group 9, and to overlap with the electrodes of the opposing substrates. As a sealing material 6 on one of the electrode substrates 1 and 2, 1.5 wt % of spacers 7 (glass fibers with an average particle size of 7.0 μm) for maintaining an electrode gap in a thermosetting epoxy resin and conductive particles 8 (on the surface 1.0w of polystyrene particles with an average particle size of 7.25μm on which a gold plating layer of 0.1μm thickness was formed.
The sample containing t% was printed by screen printing. Next, the two electrode substrates are pasted together with the alignment film 5 and an appropriate number of spacers (polystyrene cross-linked polymer or glass fiber, not shown) sandwiched between them, until the sizes of the spacers 7 and conductive particles 8 are equal. After compressing and establishing electrical continuity between the upper and lower electrodes using the conductive particles 8, the sealing material 6 is cured. Through this step, the scanning electrode group 3 and the extraction electrode group 9 provided on the signal electrode substrate 2 are electrically connected. After this,
A liquid crystal 16 is placed between the electrode substrates 1 and 2 surrounded by the sealing material 6.
was injected, and then the liquid crystal injection port 10 was sealed with an ultraviolet curable resin to produce a liquid crystal display element.

[0017] When the lighting display of the liquid crystal display element manufactured as described above was evaluated, the same results as in Example 1 were obtained.
It was confirmed that a liquid crystal display element with high uniformity without display unevenness over the entire panel including the vicinity of the seal was manufactured.

(Example 3) (FIG. 5(a)), (FIG. 5(b)
)) are schematic plan views of an electrode substrate constituting a liquid crystal display element in Example 3 of the present invention, (Fig. 6(a)), (Fig. 6(b)
)) shows a cross-sectional view of the structure of the extraction electrode terminal portion and the signal electrode terminal portion of the liquid crystal display element in Example 3.

First, on one of the substrates, a SiO2 insulating layer 1 having approximately the same thickness (approximately 2000 Å) as the extraction electrode 9 is formed.
5 was provided so as to overlap with the sealing material 6 other than the extraction electrode group 9. A spacer 7 for maintaining an electrode gap is placed in a thermosetting epoxy resin as a sealing material 6 on one of the electrode substrates 1 and 2.
1.5 wt% of (glass fiber with an average particle size of 7.0 μm) and 1 portion of conductive particles 8 (polystyrene particles with an average particle size of 7.25 μm with a gold plating layer of 0.1 μm thick on the surface)
．． The sample containing 0 wt% was printed by screen printing. Next, the two electrode substrates are pasted together with the alignment film 5 and an appropriate number of spacers (polystyrene cross-linked polymer or glass fiber, not shown) sandwiched between them, until the sizes of the spacers 7 and conductive particles 8 are equal. After compressing and establishing electrical continuity between the upper and lower electrodes using the conductive particles 8, the sealing material 6 is cured. Through this step, the scanning electrode group 3 and the extraction electrode group 9 provided on the signal electrode substrate 2 are electrically connected. Thereafter, liquid crystal 16 was injected into the gap between electrode substrates 1a and 1b surrounded by sealing material 6, and then liquid crystal injection port 10 was sealed with ultraviolet curing resin to produce a liquid crystal display element.

[0020] When the lighting display of the liquid crystal display element manufactured as described above was evaluated, it was found that, as in Examples 1 and 2, a liquid crystal display element with high uniformity over the entire panel including the vicinity of the seal was manufactured. It was confirmed that

[0021] In this embodiment, the seal resin materials 6, 12
Although a thermosetting type is used as the material, it is also possible to use an ultraviolet curable resin. In addition, although we have only discussed the screen printing method as a method for forming it, other methods (
For example, application using a dispenser or flexographic printing method is also possible.

Any conductive particles may be used as long as they have a certain degree of elasticity and a small particle size distribution.

The insulating layer may be of any material as long as it has good adhesion to the substrate. Further, although this embodiment does not mention the relationship between the spacer in the seal and the spacer in the cell, it is desirable that the spacer in the seal is larger or the same as that in the cell.

[0024]

[Effects of the Invention] As described above, the present invention reduces the size of spacers mixed in the sealing material in a single-sided substrate-extracted type liquid crystal display element in which signal electrodes and scanning electrodes can be connected to external circuits on the same substrate. The spacing between the liquid crystal layers sandwiched between the substrates can be reduced by selectively using them depending on the level difference caused by the presence or absence of thin film electrodes on the substrate surface, or by providing dummy electrodes or thin films to make the level difference the same. can be made equal. Therefore, it is possible to eliminate the uneven lighting display caused by the uneven thickness of the liquid crystal layer in the periphery of the seal as in the conventional case.

[Brief explanation of drawings]

FIG. 1 is a conceptual plan view of an electrode substrate constituting a liquid crystal display element in Example 1 of the present invention.

[Fig. 2] A cross-sectional view of the configuration of the terminal portion of the liquid crystal display element in Example 1 of the present invention.

FIG. 3 is a conceptual plan view of an electrode substrate constituting a liquid crystal display element in Example 2 of the present invention.

FIG. 4 is a cross-sectional view of the structure of a terminal portion of a liquid crystal display element in Example 2 of the present invention.

FIG. 5 is a conceptual plan view of an electrode substrate constituting a liquid crystal display element in Example 3 of the present invention.

FIG. 6 is a cross-sectional view of the terminal portion configuration of a liquid crystal display element in Example 3 of the present invention.

[Fig. 7] Cross-sectional view of the terminal part configuration of a conventional liquid crystal display element

[Explanation of symbols]

1 Scanning electrode substrate 2 Signal electrode board 3 Scanning electrode 4 Signal electrode 5 Alignment film 6 Seal material 7 Spacer 8 Conductive particles 9 Extraction electrode 10 Inlet 12 Seal material 13 Spacer 14 Dummy electrode 15 Insulating layer 16 Liquid crystal layer

Claims (5)

[Claims] Claim 1: A liquid crystal layer surrounded by a sealing material mixed with spacers is sandwiched between a signal electrode substrate having a plurality of signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes, and either one of the signal electrode substrates has a plurality of signal electrodes and a scanning electrode substrate has a plurality of scanning electrodes. has an extraction electrode on a substrate, the extraction electrode is configured at a position corresponding to the electrodes of the substrate facing each other with the sealing material interposed therebetween, and the extraction electrode is formed by mixing conductive particles into the sealing material. and electrodes on opposing substrates are electrically connected to form a liquid crystal display element, and spacers of different sizes are mixed into the sealing material in the portion overlapping the extraction electrode and the sealing material in the other portions, respectively. A liquid crystal display element characterized by: [Claim 2] The diameter of the spacer mixed in the sealing material that overlaps the extraction electrode is made larger than the diameter of the spacer mixed in other sealing materials, and the particle size difference is approximately the same as the film thickness of the extraction electrode. The liquid crystal display element according to claim 1, characterized in that: 3. A liquid crystal whose periphery is surrounded by a sealing material containing spacers between a signal electrode substrate having a plurality of signal electrodes and a plurality of dummy electrodes and a scanning electrode substrate having a plurality of scanning electrodes and dummy electrodes. The layer is sandwiched between the layers, and an extraction electrode is provided on one of the substrates, and the extraction electrode is configured at a position corresponding to the electrodes of the substrates facing each other with the sealing material sandwiched therebetween, and conductive particles are provided on the sealing material. A liquid crystal display element is constructed by electrically connecting the extraction electrode and an electrode on an opposing substrate by mixing the extraction electrode, and the dummy electrode is provided so as to overlap with a sealing material other than a portion overlapping with the extraction electrode. . A liquid crystal display element, wherein the dummy electrode is formed to correspond to the position of the electrode on the substrates facing each other with a seal in between. 4. A liquid crystal layer surrounded by a sealant containing spacers is sandwiched between a signal electrode substrate having a plurality of signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes, has an extraction electrode on a substrate, the extraction electrode is configured at a position corresponding to the electrodes of the substrate facing each other with the sealing material interposed therebetween, and the extraction electrode is formed by mixing conductive particles into the sealing material. and electrodes on opposing substrates are electrically connected to form a liquid crystal display element, and a predetermined pattern corresponding to the thickness of the lead-out electrode is formed so as to overlap with the sealing material other than the portion overlapping the lead-out electrode. 1. A liquid crystal display element comprising: an insulating layer having a structure formed on at least one substrate. 5. A liquid crystal layer surrounded by a sealant containing spacers is sandwiched between a signal electrode substrate having a plurality of signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes, has extraction electrodes on the substrate, and the extraction electrodes are configured at positions corresponding to the electrodes of the substrates facing each other with the sealing material in between, and the extraction electrodes are formed by mixing conductive particles into the sealing material. A liquid crystal display element in which electrodes on opposing substrates are electrically connected, and a sealing material provided to overlap the extraction electrode and a sealing material provided to other parts are formed on separate substrates. , Claim 1 characterized in that:
Or the method for manufacturing a liquid crystal display element according to 2.