JPH0821989A - Liquid crystal display element and its production - Google Patents

Abstract

PURPOSE:To prevent electrification of an insulating film, oriented film, liquid crystal material or the like due to electrostatic charges produced in the process succeeding to the assembling process by forming a transparent film having a specified range of surface resistance on the surface of a glass substrate where a transparent electrode is not formed. CONSTITUTION:Transparent electrodes 3c and 3d are formed on liquid crystal substrates 3a and 3b, respectively, and then an insulating film 3e and an oriented film 3f are successively formed on electrode. The substrates are disposed at specified intervals by plural numbers of spacers 3h in such a manner that transparent electrodes 3c and 3d in stripes cross each other and face each other. A liquid crystal material 3g is sealed in the space. A transparent film 3a' is formed on the other surface of each transparent substrate 3a and 3b, and a phase difference plate 3j and a polarizing plate 3k are laminated on the film 3a'. By controlling the surface resistance of the transparent film 3a' to 10<8> to 10<11>OMEGA/cm<2>, the film smoothly absorbs charges from the phase difference plate 3j to remove charges. If the surface resistance is >=10<12>OMEGA/cm<2>, the charges is not completely removed from the phase difference plate causing electrification of the insulating film or the like and display defect.

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 and a method for manufacturing the same, and more particularly, to prevent static electricity generated in the process of assembling the liquid crystal display device from charging the insulating film, the alignment film and the liquid crystal material. And a method for manufacturing the same.

[0002]

2. Description of the Related Art As a conventional technique, there is a liquid crystal display element for an electronic timepiece as shown in FIG. In the case of an electronic wrist watch, static electricity is charged on the exterior glass 13 due to friction of plastic or the like, but even if the static electricity is discharged and electromagnetic waves are generated, the transparent conductive film 43a 'on the upper surface of the upper glass 43a of the liquid crystal panel 43 is a panel. Presser plate 45 to main plate 46, body 1
1 and is further electrically connected to the back cover 48, it serves as a shield for the patterns on the IC 42 and the circuit board 41. Therefore, since no potential difference is generated in the IC 42, malfunction of the circuit or destruction of the gate does not occur. In the above conventional technique, the transparent conductive film is deposited only on the upper surface of the upper glass of the liquid crystal panel, and the transparent conductive film is not deposited on the lower glass. This is because in the related art, it is sufficient to consider measures against static electricity after being incorporated into a product as a display device. Examples of conventional techniques such as these include:
It is disclosed in Japanese Patent No. 5783.

[0003]

In the prior art, a transparent electrode is formed on two glass substrates, an insulating film and an alignment film are sequentially formed, and the glass substrates are assembled so as to face each other, and then the predetermined electrodes are assembled. Cut into external dimensions, enclose liquid crystal material, and
In the process of adhering a retardation plate or a polarizing plate to complete a liquid crystal display element, no consideration was given to static electricity generated in the steps after assembly. Static electricity generated in the process after the assembly is
The liquid crystal material is charged and changes the orientation angle that determines the initial state of the liquid crystal molecules, which causes display failure.

An object of the present invention is to provide a liquid crystal display device and a method for manufacturing the same, in which static electricity generated in the steps after assembling, which is a problem in the above-mentioned prior art, does not charge the insulating film, the alignment film, the liquid crystal material and the like. To do.

[0005]

In order to achieve the above object, a liquid crystal display element according to the present invention has a stripe-shaped transparent electrode formed on one surface, and an insulating film and an alignment film are formed on the transparent electrode. The two glass substrates sequentially formed are arranged so that the transparent electrodes are orthogonal to each other, and the surface resistance value of 10 ⁸ to 10 ¹¹ is on the surface of the other surface of each glass substrate where the transparent electrodes are not formed. A transparent film having Ω / cm ² was provided.

Further, in the method for manufacturing a liquid crystal display element according to the present invention, two glass substrates each having a stripe-shaped transparent electrode formed on one surface and an insulating film and an alignment film sequentially formed on the transparent electrode are provided. , The transparent electrodes are arranged so as to be orthogonal to each other, the glass substrate is assembled via a sealing material having a predetermined shape, and the conductive fine particle coating liquid is applied to the surface of the other surface of the glass substrate on which the transparent electrode is not formed. Was applied and cured to form a transparent film having a surface resistance value of 10 ⁸ to 10 ¹¹ Ω / cm ² .

[0007]

[Function] The surface resistance value 10 ⁸ formed on the surface of the glass substrate
Since the transparent film of -10 ¹¹ Ω / cm ² can remove static electricity from the outside in the manufacturing process of the liquid crystal display element, static electricity can be prevented from charging the insulating film, the alignment film, the liquid crystal material, etc. Since no change occurs, it is possible to prevent the occurrence of display defects.

[0008]

EXAMPLES The liquid crystal display element and the method for manufacturing the same according to the present invention will be specifically described below. FIG. 1 is a sectional view schematically showing an example of a liquid crystal display element according to the present invention. This liquid crystal display element 3 has an ITO film (Indium T) on transparent substrates 3a and 3b made of glass, plastic, or the like.
in Oxide: Indium oxide
Transparent electrodes 3c and 3d are formed, and the insulating film 3 is formed on the transparent electrodes 3c and 3d.
e, the alignment film 3f is sequentially formed. The stripe-shaped transparent electrodes 3c and 3d are orthogonal to each other and are arranged so as to be opposed to each other and are kept at a predetermined interval by a plurality of spacers 3h. The liquid crystal material 3g is enclosed in this space. The transparent film 3a ′ according to the present invention is formed on the other surface of the transparent substrates 3a and 3b, and the retardation plate 3j and the polarizing plate 3k are attached thereon.

Generally, the bonding of the retardation plate and the polarizing plate is completed in the previous step. Since the retardation plate is an insulator such as polycarbonate or acrylic, it has a property that it is easily charged with static electricity and the charge is hard to pass through. Therefore, the surface resistance value of the transparent film 3a 'is 10 ⁸ to 10 ¹¹ Ω / c.
By the m ^2, it is possible to quickly absorb the charge from the phase difference plate, neutralizes.

The surface resistance of the transparent film 3a 'is 10 ¹² Ω.
If it is / cm ² or more, the electric charge from the retardation plate cannot be completely removed, and the insulating film, the alignment film, and the liquid crystal material are charged, which causes display failure. The method of forming the transparent film 3a ′ described above is as follows, after the transparent substrates 3a and 3b are bonded together as shown in FIG.
As shown in FIG. 3, the transparent film liquid is coated by (a) dipping method, (b) roll coating method, and (c) spraying method.

Reference numeral 3l in FIG. 2 denotes a seal portion for sealing the transparent film liquid so as not to enter the liquid crystal material enclosure portion. Three
Reference numeral i denotes a seal portion in which the liquid crystal material is sealed. As a transparent film liquid, tin oxide (SnO ₂ ) solution, silica (S
The iO ₂ ) solution is mixed at a predetermined ratio to give a film thickness of 500-
Set to about 1000Å, 160-180 after coating
Bake at ℃ to cure. The surface resistance value is adjusted by the mixing ratio of tin oxide and silica.

[0012]

According to the present invention, by forming a transparent film having a surface resistance value in a predetermined range on the outer side of two transparent substrates, the static electricity from the outside can be quickly removed and the inner side of the transparent substrate can be removed. The formed insulating film, alignment film, and liquid crystal material can be prevented from being charged, and display defects due to changes in the alignment angle can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid crystal display device according to the present invention.

FIG. 2 is a plan view of a liquid crystal display device according to the present invention after assembly.

FIG. 3 is a diagram showing a coating method for forming a transparent film.

FIG. 4 is a cross-sectional view of a conventional timepiece liquid crystal display element.

[Explanation of symbols]

3 ... Liquid crystal display element, 3a, 3b ... Transparent substrate, 3a '... Transparent film, 3c, 3d ... Transparent electrode, 3e ... Insulating film, 3f ... Alignment film, 3g ... Liquid crystal material, 3h ... Spacer, 3i, 3l ... Seal Part, 3j ... Retardation plate, 3k ... Polarizing plate.

Claims (2)

[Claims] 1. A striped transparent electrode is formed on one surface, and an insulating film and an alignment film are sequentially formed on the transparent electrode.
The glass substrates are arranged so that the transparent electrodes are orthogonal to each other, and the surface resistance value is 10 ⁸ to 10 ¹¹ Ω on the surface of the other surface of each glass substrate on which the transparent electrodes are not formed.
A liquid crystal display device characterized by being provided with a transparent film having a thickness of / cm ² . 2. A stripe-shaped transparent electrode is formed on one surface, and an insulating film and an alignment film are sequentially formed on the transparent electrode.
The glass substrates are arranged so that the transparent electrodes are orthogonal to each other, and the glass substrates are assembled through a sealing material having a predetermined shape, on the surface of the other surface where the transparent electrodes of each glass substrate are not formed. By applying and curing the conductive fine particle coating solution, the surface resistance value is 10 ⁸ to 10 ¹¹ Ω /
A method of manufacturing a liquid crystal display device, which comprises forming a transparent film having a size of cm ² .