JPH0961799A - Liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling of liquid crystal cells and enclosing of a liquid crystal compsn., to shorten the time for production, to improve production capacity and to reduce a manufacturing cost by forming the circumference of the effective display region of at least one substrate of a thermoplastic high- polymer material. SOLUTION: Either one of first and second electrode substrates 10, 11, for example, the first electrode substrate 10, is printed and coated with the liquid crystal compsn. 20 which is the thermoplastic high-polymer material. Further, spacers 21 are sprayed on the surface coated with the liquid crystal compsn. 20. The second electrode substrate 11 is then aligned and arranged to face the substrate described above and the outer periphery of the effective display region is heated and sealed. The liquid crystal display element 1 formed in such a manner is about one minute in the time required for printing and coating of the liquid crystal compsn. 20 and is about 30 minutes in the time required for heating and sealing of both electrode substrates 10, 11. The production time is thus made shorter to about 1/20 than heretofore. The manufacturing cost is nearly halved and the cost of the liquid crystal display element is reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid crystal display device, and more particularly to improvement of a liquid crystal cell holding a liquid crystal composition.

[0002]

2. Description of the Related Art In recent years, because of the advantages of thinness, light weight and low power consumption, small items such as wrist watches and calculators are
2. Description of the Related Art Liquid crystal display elements are often used as display devices for large devices such as word processors and personal OA devices such as desktop personal computers.

In these liquid crystal display elements, generally, a pair of electrode substrates each having a pixel electrode and a counter electrode are arranged so as to face each other via a spacer, and the periphery is adhered with a sealant to form a liquid crystal cell. The structure is such that the liquid crystal composition is injected into the cell gap and then sealed.

In the liquid crystal display device having such a structure, when assembling the liquid crystal cell, a sealant is printed on each electrode substrate or a desired seal pattern is formed by a dispenser, and then the other spacer is sprinkled. In the past, since the sealing material is bonded by being heated and cured while being bonded to the electrode substrate and maintaining the pressure state, conventionally, two electrode substrates arranged opposite to each other are sandwiched between two metal plates to apply a pressure device. After pressurizing with, the gap between the two metal plates is fixed with a screw or the like, and the metal plate is placed in a heating furnace to heat and cure the sealant.

Further, the liquid crystal composition is injected into the liquid crystal cell by decompressing the inside of the liquid crystal cell in a vacuum chamber, filling the injection port with the liquid crystal composition, and then increasing the atmospheric pressure outside. It is filled in the liquid crystal cell.

[0006]

The conventional liquid crystal display device has the following problems.
At the time of its production, after applying a sealant to the electrode substrate, it is attached to the opposite electrode substrate and the sealant is heat-cured to form a liquid crystal cell, while the liquid crystal composition is placed in the liquid crystal cell by a reduced pressure injection method. It was filling.

It took about 6 hours to heat-cure the sealant and about 4 hours to fill the liquid crystal composition.

As a result, the manufacturing time of the liquid crystal display element becomes extremely long, the production capacity is lowered, and the manufacturing cost is increased.

Therefore, the present invention solves the above problems and facilitates assembling of a liquid crystal cell and encapsulation of a liquid crystal composition, shortens the manufacturing time, improves the production capacity, and reduces the manufacturing cost. The purpose is to provide.

[0010]

As a first means for solving the above-mentioned problems, the present invention provides a first electrode substrate having a first electrode on a first substrate and a second electrode substrate on a second substrate. A liquid crystal display device comprising: a second electrode substrate having a second electrode and opposed to the first electrode substrate with a gap therebetween; and a liquid crystal composition held in the gap. The periphery of the effective display area defined by the electrodes on at least one of the substrate and the second substrate is made of a thermoplastic polymer material.

The present invention also provides a second object for solving the above problems.
As means for the above, in the first means, a through hole is formed in a region of the first electrode or the second electrode facing the thermoplastic polymer substance, which is in contact with the thermoplastic portion of the polymer substance. It is a thing.

The present invention also provides a third aspect for solving the above problems.
In the second means, a part of the region where the through hole on the first electrode or the second electrode is formed is short-circuited to the opposing region on the electrode separated by the through hole. An electrode is provided. With this configuration, the time required for assembling the liquid crystal cell and the filling of the liquid crystal composition is shortened, the productivity of the liquid crystal display device is improved, and the manufacturing cost is reduced.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the first embodiment shown in FIGS. The first and second electrode substrates 10 and 11 of the liquid crystal display element 1 have a thickness of 0.1.
mm, the first and second transparent substrates 12 made of a transparent polyester resin film having an outer dimension of 250 × 30 mm,
13 on top of 300 Angstrom thick Indium
A tin oxide (hereinafter referred to as ITO) vapor deposition film is formed by a sputtering method to form a transparent conductive film, and then a wet etching method using an acidic solution is used so that a 300 μm square pixel is formed in an effective display area. By the photo-etching method, the vapor-deposited film was vertically and horizontally 64
The pattern is formed in a stripe pattern of 0 and 480 lines, and the first
And second transparent electrodes 14 and 16.

Further, a thickness 60 is formed on each transparent electrode 14, 16.
First and second alignment films 17 and 1 made of 0 angstrom polyimide SE-150 (manufactured by Nissan Chemical Industries, Ltd.)
8 is formed into a film, and an alignment treatment is performed.

The liquid crystal composition (ZLI2293: manufactured by E. Merck) 20 is 5 μm on either one of the first and second electrode substrates 10 and 11 thus formed, for example, the first electrode substrate 10. Of the spacer 2 having a particle diameter of 5.0 μm on which the liquid crystal composition 20 is applied.
1 is sprinkled so that the substrate density is about 70 pieces / mm ² .

Next, as shown in FIG. 2, the liquid crystal composition 20.
While the second electrode substrate 11 is aligned and opposed to the first electrode substrate 10 having the spacers 21 and the outer periphery of the effective display area shown by hatching in FIG. 3, a pressure of 10 kgf / cm ² is applied. It is heat-sealed at 200 ° C., and further, the first and second retardation plates 22 and 23, the first and second polarizing plates 2
4 and 26 are attached to complete the liquid crystal display element 1 shown in FIG.

In the liquid crystal display element 1 thus formed, the time required for printing and applying the liquid crystal composition 20 is only about 1 minute, and the time required for heat sealing the both electrode substrates 10 and 11 is about. It is 30 minutes, and the manufacturing time can be shortened to about 1/20 compared with the conventional one, and the manufacturing cost is almost 1
The cost of the liquid crystal display device can be reduced to 1/2.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, a slit 27 is formed by a photoetching method outside the effective display area of the first and second transparent electrodes 14 and 16 in the first embodiment, and the others are the first embodiment. Since it is the same as that of Embodiment 1, the same reference numerals are given and the description thereof is omitted.

That is, the third and fourth transparent substrates 28, 29
The deposited film on the top was 640 and 48 by photo-etching method.
When forming the third and fourth transparent electrodes 31 by patterning in a stripe shape of 0 pieces, a plurality of slits 27 are formed in the outer peripheral portion of the effective display area of each transparent electrode 31.
The surface area of the transparent electrode 31 in the outer peripheral portion of the effective display area is reduced, and the exposed area of the transparent substrates 28 and 29 is increased.

The liquid crystal composition (ZLI2293: manufactured by E. Merck & Co., Inc.) 20 is used for the third and fourth electrode substrates 33, 34 having such transparent electrodes 31, 32 as in the first embodiment. Is applied by printing, and while the spacers 21 are scattered, the electrode substrates 33 and 34 are aligned and heat-sealed to complete the liquid crystal display element 36.

The liquid crystal display element 36 thus formed
The manufacturing time is shortened, the manufacturing cost is reduced, the cost of the element is reduced, and the contact area between the transparent substrates 31 and 32 is increased, as in the first embodiment. When the adhesion was measured with a push-pull gauge, it was found that the peeling occurred with a weight of 30 kg in the present embodiment as compared with the peeling with a weight of 10 kg in the first embodiment. Is significantly increased, the occurrence of defects due to peeling of both electrode substrates 31 can be reduced, and reliability can be improved.

Next, a third embodiment of the present invention will be described with reference to FIG. The present embodiment is provided with an auxiliary electrode 37 that short-circuits a part of the slit 27 formed in the third and fourth transparent electrodes 31 in the second embodiment, and the others are the second embodiment. Since it is the same as the embodiment, the same reference numerals are given and the description thereof is omitted.

That is, the fifth and sixth transparent substrates 38, 39
The deposited film on the top was 640 and 48 by photo-etching method.
When forming the fifth and sixth transparent electrodes 41 having a pattern of 0 stripes and having slits 27, the slits 2 are formed at positions facing the slits 27 at the time of heat bonding.
7 in contact with a part of 7 and short-circuit the opposing regions separated by the slit 27 in units of one transparent electrode 41 each.
And the auxiliary electrode 37 made of a material having a resistance value lower than that of ITO, which is the material of the sixth transparent electrode 41, and the resistance of the transparent electrode raised due to the slit 27 on the transparent electrode 41 in the outer peripheral portion of the effective display area. The value has been reduced.

In this way, the transparent electrode 41 is replaced by the auxiliary electrode 3
The fifth and sixth electrode substrates 43 and 44 to which 7 is brought into contact are treated in the same manner as in the first and second embodiments, and the liquid crystal composition (Z
LI2293: E. (Merck Co., Ltd.) 20 is applied by printing, spacers 21 are scattered, and both electrode substrates 43 and 44 are aligned and heat-sealed to complete a liquid crystal display element 46.

The liquid crystal display element 46 thus formed
As in the second embodiment, the manufacturing time is shortened, the manufacturing cost is reduced, the price is reduced, and the adhesion between the transparent substrates 41 is increased, so that the reliability is improved. Is also planned. In addition, the electric contact resistance of the crimping portion of the liquid crystal display element is reduced to about 1/2 in the present embodiment as compared with the second embodiment, and the temperature rises even when used for a long time. In this way, a good operating temperature range can be maintained and good display characteristics can be obtained.

The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the spirit of the present invention. For example, the material of a thermoplastic polymer material is not limited,
For example, polyethylene terephthalate, polyether sulfone, polyacrylate, polyimide polyether ether ketone-polyethylene naphthalate, polycarbonate, polymethylmethacrylate, polysulfone, or the like may be used, and the driving means of the liquid crystal display element may be an active matrix. It is optional, such as

[0027]

As described above, according to the present invention, since at least the periphery of at least one effective display area of at least one of the electrode substrates facing each other is formed of a thermoplastic polymer material, the liquid crystal display device At the time of assembly, by heating and pressing the liquid crystal composition held on the electrode substrate, it is possible to easily and quickly adhere both electrode substrates and enclose the liquid crystal composition, which shortens the manufacturing time. As a result, the manufacturing cost can be reduced and the price of the liquid crystal display device can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a liquid crystal display element according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a state where the first electrode substrate and the second electrode substrate of the liquid crystal display element according to the first embodiment of the present invention are opposed to each other.

FIG. 3 is a schematic top view showing a heating / pressurizing position of the liquid crystal display element according to the first embodiment of the present invention.

FIG. 4 is a schematic partial top view showing a slit in an outer peripheral portion of an effective display area of a third or fourth transparent electrode according to a second embodiment of the present invention.

FIG. 5 is a schematic partial top view showing slits and auxiliary electrodes of a fifth or sixth transparent electrode according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element 10 ... 1st electrode substrate 11 ... 2nd electrode substrate 12 ... 1st transparent substrate 13 ... 2nd transparent substrate 14 ... 1st transparent electrode 16 ... 2nd transparent electrode 20 ... Liquid crystal Composition

Front page continuation (72) Inventor Hitoshi Hato 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock company Toshiba Yokohama office

Claims (3)

[Claims] 1. A first electrode having a first electrode on a first substrate.
Of the electrode substrate, a second electrode substrate having a second electrode on the second substrate and facing the first electrode substrate with a gap, and a liquid crystal composition held in the gap. A liquid crystal display device comprising: a liquid crystal display device, wherein at least one of the first substrate and the second substrate has a thermoplastic polymer material around an effective display area defined by the electrodes. . 2. A through hole is formed in a region of the first electrode or the second electrode facing the thermoplastic polymer material, which faces and contacts the thermoplastic portion of the polymer material. The liquid crystal display element according to claim 1. 3. An auxiliary electrode for short-circuiting a facing region on the electrode, which is separated by the through hole, is provided in a part of the region where the through hole is formed on the first electrode or the second electrode. The liquid crystal display device according to claim 2, which is characterized in that.