JPH0483227A - Liquid crystal display element and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the liquid crystal element of high quality which is a one-surface substrate lead-out type by using a seal material, formed by mixing conductive particles which have elasticity equal to or larger than the elasticity of spacers, with resin. CONSTITUTION:A liquid crystal layer 5 whose periphery is surrounded with the seal material 6 containing the mixed spacers 7 is sandwiched in the gap between a signal electrode substrate 1b which has plural signal electrodes 3 and a scanning electrode substrate 1a which has plural scanning electrodes 2 and a lead-out electrode 9 which is formed overlapping with the seal material 6 is provided to the signal electrode substrate 1b or scanning electrode substrate 1a; and the electrodes on the substrate facing the substrate equipped with the lead-out electrode 9 are constituted overlapping with the seal material 6 and the conductive particles are mixed with the seal material. Further, the spacers and conductive particles which differ in elasticity and particle size are mixed with the seal material. For example, a material formed by mixing spacers 7 for electrode gap holding, gas fiber, and the conductive particles with thermosetting epoxy resin is used as the seal material 6 for, for example, 1a. Consequently, the liquid crystal display element which is the one-surface substrate lead-out type is obtained.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a simple matrix type liquid crystal display element.
In particular, the present invention relates to a liquid crystal display element in which an electrode on one substrate and an electrode on an opposing substrate are electrically connected using a spacer, and a method for manufacturing the same.

Conventional technology In recent years, as information devices such as word processors and computers have become smaller and more sophisticated, there has been a strong desire for display elements used in them to be thinner and lighter, with improved characteristics, and flat displays are becoming mainstream. .

The flat display has a plasma element.

There are devices using EL elements and liquid crystal display elements, among which liquid crystal display elements are superior in terms of thinness, light weight, low power consumption, and color display, and are being widely applied.

A conventional liquid crystal display element will be explained below.

411Z(a) and (1)) are a plan view of an electrode substrate constituting a conventional liquid crystal display element, FIG. 5(a) is a plan view of a conventional liquid crystal display element, and 55(b) is a main part. It is an enlarged sectional view. The signal electrode 3 and the scanning electrode 2 are separately provided on the signal electrode substrate 1b and the scanning electrode substrate la so as to be perpendicular to each other, and a knoll material 6, a spacer 7, and an alignment film 4 are provided between the substrates.
．． A liquid crystal layer 5 is sandwiched, and after liquid crystal is injected from an injection port 10, it is sealed with a sealing resin 11. In this way, in the conventional liquid crystal display element, each terminal electrode is taken out from each side of both substrates.

Problems to be Solved by the Invention In such a conventional configuration, the leads from the terminal electrodes are taken out on both substrates, and the lead-out electrodes are formed on opposing surfaces, so when connecting to an external electric circuit, A process of flipping the liquid crystal panel is required.

In addition, the COG mounting method requires metal conductor wiring by electroless plating on the top of the drawer t in order to supply input signals and power to the drive LSI mounted on the periphery of the board, but in the conventional configuration, this is not possible. Since it is necessary for the extraction electrode portions of both the signal electrode substrate and the scanning electrode substrate, there are many problems in terms of productivity and manufacturing cost.

The present invention solves these problems, and aims to provide a high-quality, single-sided substrate-extracted type liquid crystal display element in which connection between signal electrodes and scanning electrodes is made using only one of the substrates. It is something.

Means for Solving the Problem A liquid crystal layer surrounded by a sealing material mixed with spacers is sandwiched between a signal electrode substrate having a plurality of opposing signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes. , a signal electrode substrate or a scanning electrode substrate has an extraction electrode formed to overlap with a sealing material, and an electrode on a substrate opposite to the substrate provided with the extraction electrode is configured to overlap with the sealing material, and By mixing conductive particles into the sealing material, electrical connection is established between the extraction electrode and the electrode on the opposing substrate.

According to this configuration, the extraction ti can be extracted from either one of the signal electrodes 2 and the scanning electrode substrate constituting the liquid crystal display element, making it possible to provide a single-sided substrate extraction type liquid crystal display element. Furthermore, by mixing spacers and conductive particles with different elasticities and particle sizes in the sealing material, highly reliable picture electrode connections and highly accurate cell gaps can be realized at the same time.

Example Embodiments of the present invention will be described below with reference to the drawings.

In addition, FIG. 4 in FIGS. 1 and 2.

The same parts as in Figure 5 are given the same numbers.

(Example 1) FIGS. 1(a) and 1(a) show the configurations of electrode substrates forming liquid crystal display elements of Examples 1 to 3 of the present invention. Figure 2 (a
) and (b) show the structures of the liquid crystal display elements of Examples 1 to 3 of the present invention.

As shown in the figure, first, the opposing electrode substrates 1a.

1b as a sealing material 6, and a spacer 7 for maintaining an electrode gap in a thermosetting epoxy resin with an average wire diameter of 6.5μ.
m glass fiber W (Young's modulus = 9 x 103 kg/ma2)
1.5wt%, average particle size 7.0μ as conductive particles 8
The surface of a cross-linked polystyrene polymer of 1.m is plated with nickel to a thickness of 0.1 μm by electroless plating (Young's modulus: 5×10”kg/mm”). The sample containing Ow t% was printed by a screen printing method. Next, the two electrode substrates are pasted together with a spacer (polystyrene crosslinked polymer, not shown) of an appropriate value sandwiched therebetween, and then compressed under pressure until the size of the spacer 7 and the conductive particles 8 become equal. After the upper and lower electrodes are electrically connected by the conductive particles, the sealing material is cured. Through this step, the scan electrode 2 and the lead-out scan electrode 9 provided on the signal electrode substrate Ib are electrically connected. Thereafter, the liquid crystal 5 was injected into the gap between the electrode substrates 1a and lb surrounded by the sealing material through the liquid crystal injection port 10, and then the liquid crystal injection port 10 was sealed with an ultraviolet curing resin 11 to produce a liquid crystal display element.

The liquid crystal display element manufactured as described above was (1) left at high temperature at 70°C for 1000 hours, (2) left at low temperature at 40°C.
000h, (3) Humidity 60°C/95% 1000
h. (4) Thermal shock test was conducted at -40 to 85°C for 1000 cycles, but no change was observed in the wiring resistance including connections. Furthermore, when the cell gap during sealing was measured, it was confirmed that a very uniform liquid crystal cell was produced, which was 6.5 μm±0.05 μm.

(Example 2) FIGS. 2(a) and 2(a) show the structure of a liquid crystal display element according to Example 2 of the present invention. As shown in the figure, a sealing material 6 is placed on one side of the opposing electrode substrates 1a and lb, and a spacer 7 for maintaining an electrode gap is placed in a thermosetting epoxy resin with an average wire diameter of 4.
0 μm glass fiber (Young's modulus: 9 X I O"
kg/mm2) and 1.5 wt% of conductive particles 8, the surface of a polystyrene crosslinked polymer with an average particle size of 4.5 μm was plated with nickel to a thickness of 0.1 μm by electroless plating (Young's modulus: 5× 102kg/mm”) to 1
．． The sample containing 0 wt% was printed by screen printing. Next, connect the two electrode substrates with an appropriate spacer (
After sandwiching and bonding a polystyrene cross-linked polymer (not shown), the spacer 7 and the conductive particles 8 are compressed under pressure until they are equal in size, and the conductive particles 8 electrically connect the upper and lower electrodes. After that, harden the sealant. Through this step, the scan electrode 2 and the lead-out scan electrode 9 provided on the signal electrode substrate Ib are electrically connected. Thereafter, the liquid crystal 5 was injected into the gap between the electrode substrates 1a1b surrounded by the sealing material through the liquid crystal injection port 10, and then the liquid crystal injection port 10 was sealed with an ultraviolet curing resin 11 to produce a liquid crystal display element.

The liquid crystal display element prepared as above was (1) left at high temperature at 70°C for 1000 hours, (2) left at low temperature at -40°C.
1000h, (3) Humidity 60°C/95% 1000
h. (4) Heat bombardment NJ-40~85°C 100O cycle test was conducted, but no change was observed in wiring resistance including connection. Furthermore, when the cell gap during sealing was measured, it was found that a very uniform liquid crystal cell was produced, which was 4.0 +0.05 μm.

(Example 3) FIG. 2 (al and (b)) shows the structure of a liquid crystal display element according to Example 3 of the present invention.

As shown in the figure, glass particles with an average particle size of 5.5 μm (Young's modulus 1×103 kg/ml 1 liter) were used as a sealing material 6 on one side of the opposing electrode substrates 1a and 1b, and as a spacer 7 for maintaining an electrode gap in thermosetting Evokin resin. 1.swt
%, conductive particles 1o are glass particles with an average particle size of 5.7 μm plated with nickel to a thickness of 0.1 μm by electroless plating (Young's modulus: 9 X l 02 kg/m
A sample containing 0.5 wt% of m2) was printed by screen printing. Next, the two electrode substrates are pasted together with a spacer (polystyrene crosslinked polymer, not shown) of an appropriate value sandwiched therebetween, and then compressed under pressure until the size of the spacer 7 and the conductive particles 1o become equal. After the upper and lower electrodes are electrically connected by the conductive particles, the sealing material 6 is cured. Through this step, the scan electrode 2 and the lead-out scan electrode 9 provided on the signal electrode substrate Ib are electrically connected.

After that, the liquid crystal 5 is injected into the gap between the electrode bases @1a and lb surrounded by the sealing material from the liquid crystal injection port 10, and then the liquid crystal injection port 1o is sealed with an ultraviolet curable resin 11 to produce a liquid crystal display element. The liquid crystal display element prepared as above (
1) High temperature storage at 70°C 1oooh, (2) Low temperature storage at 40'C 1000h, (3) Humidity storage at 60°C/95%
1000 hours, (4) thermal shock -40 to 85" C100○ cycle test, but no change was observed in wiring resistance including connection. Also, when the cell gap during sealing was measured, 5. It was also confirmed that a very uniform liquid crystal cell of 5±0.05 μm was produced.

Although this example describes the particle size difference δ between two types of materials, the spacer 7 and the conductive particles 8, there is a difference between the particle size difference between the spacer 7 and the conductive particles 8 and the required cell gap. 3
There is a relationship as shown in the following.

When the diameter d of the spacer is fixed and the diameter dd of the conductive particles is changed, if the particle size difference δ exceeds 0.8 μm, the created cell gap d will be larger than the required cell gap d5, and there will be variations. also becomes larger. That is, if the particle size difference δ is made too large and the seal is pressurized and hardened, the desired cell gap d5 will not be obtained and variations will increase. Therefore, in order to achieve both high reliability of electrical connection and highly accurate cell gear 7ds, it is necessary to make the particle size difference δ 08 μm or less. The Young's modulus of the conductive particles is preferably 1 to 101 as long as they can be deformed by pressure compression and retain repulsive force.
0x102/gate 2 is suitable.

Further, in this embodiment, a thermosetting resin is used as the nol material, but it is also possible to use an ultraviolet curable resin.

Also, although this example does not mention the relationship between the spacer in the seal material and the spacer in the cell, it is desirable that the spacer in the seal material has a larger diameter than the spacer in the cell, or that they have the same diameter. .

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, the signal electrodes and scanning electrodes can be connected to an external circuit on the same substrate, which eliminates the need for a step of turning over the liquid crystal display element on the manufacturing line. Furthermore, when forming a metal film on the terminal connection portion to support COG mounting, it is sufficient to form the metal film on only one of the substrates, which is advantageous in terms of cost. In addition, because the spacer and conductive particles mixed in the sealing material have different elasticity and particle size, it is possible to form highly reliable electrical connections and highly accurate cell gaps.

[Brief explanation of the drawing]

FIG. 1(a) is a plan view of the scanning electrode substrate of the liquid crystal display elements of Examples 1 to 3 of the present invention, FIG. 1(b) is a plan view of the same signal electrode substrate, and FIG. 2(a) is the same. A plan view of the liquid crystal display element, FIG. 2(b) is an enlarged sectional view of the same essential part, and FIG. 3 is a graph showing the relationship between the particle size difference between the spacer and conductive particles and the cell gap.
Fig. 4 (al is a plan view of the scanning electrode substrate of the conventional liquid crystal display element, Fig. 4 (b) is a plan view of the same signal electrode substrate, Fig. 5 (a) is a plan view of the same liquid crystal display element, 5(b) is an enlarged sectional view of the same essential parts. 1a...Scanning electrode substrate, 1b...Signal electrode substrate, 2...Scanning electrode, 3... ...Signal electrode, 4...Alignment film, 5...Liquid crystal w
, 6... Seal material, 7... Spacer,
8... Conductive particles, 9... Scanning electrode for extraction, lO... Liquid crystal injection port, 11...
- Ultraviolet curing resin, d5...Diameter of spacer, dd...Diameter of conductive particles. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 1 (EJ & Wakitsuji) (♂ = d-ku d5n (/LI”T'l) Figure 1 (cL) Figure (α) ) Figure % guy! 3 editions 1 revision 1

Claims (3)

[Claims] (1) A liquid crystal layer surrounded by a sealing material mixed with spacers is sandwiched between a signal electrode substrate having a plurality of opposing signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes, and the signal electrode substrate is Alternatively, the scanning electrode substrate has an extraction electrode formed to overlap with a sealing material, and an electrode on a substrate opposite to the substrate provided with the extraction electrode is configured to overlap with the sealing material and conductive to the sealing material. In a liquid crystal display element configured by electrically connecting the extraction electrode and an electrode on an opposing substrate by mixing conductive particles, the conductive element has an elastic modulus equal to or larger than that of the spacer. A liquid crystal display element that uses a sealing material containing sexual particles mixed into a resin. (2) The liquid crystal display element according to claim (1), wherein a sealing material is used in which a spacer and conductive particles are mixed, which are conductive particles having a diameter larger than that of the spacer, and the difference in diameter is 0.8 μm or less. (3) A liquid crystal layer surrounded by a sealing material mixed with spacers is sandwiched between a signal electrode substrate having a plurality of opposing signal electrodes and a scanning electrode substrate having a plurality of scanning electrodes, and the signal electrode substrate is Alternatively, the scanning electrode substrate has an extraction electrode formed to overlap with a sealing material, and an electrode on a substrate facing the substrate provided with the extraction electrode is configured to overlap with the sealing material, and the electrode is formed to overlap with the sealing material. In a liquid crystal display element in which the extraction electrode and the electrode on the opposing substrate are electrically connected by mixing conductive particles, a sealing material formed by mixing a spacer and conductive particles in a resin is used. After pressing the printed substrate and the opposing substrate together until the conductive particles and spacers are equal in size,
3. The method for manufacturing a liquid crystal display element according to claim 1, wherein the sealing material is cured.