JP2010026307A - Liquid crystal display element and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein, it is difficult to coat, with an inorganic material for improving moisture resistance, an outer peripheral portion of a liquid crystal display element formed by arranging a pixel electrode substrate and a transparent electrode substrate opposite each other, providing alignment films on internal surfaces of the pair of substrates respectively, and offsetting and sticking the pair of substrates together with a desired gap interposed. <P>SOLUTION: The liquid crystal display element is formed by arranging the pixel electrode substrate and transparent electrode substrate opposite each other, providing the alignment films on the internal surfaces of the pair of substrates respectively, offsetting and sticking the pair of substrates together with the desired gap, charging the liquid crystal in the desired gap, and sealing the gap. An outer peripheral end surface of a seal material for sticking the pair of substrates together and outer peripheral end surfaces of the pair of substrates are previously impregnated with a resin material, which is cured and sealed, and then a surface of the resin agent is coated with the inorganic film. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display element and a method for manufacturing the same.

  FIG. 4 is a schematic view of a liquid crystal display device according to the present invention, which is a top view (A), an XX sectional view (B), and a YY sectional view (C). The liquid crystal display element 11 is composed of a pair of substrates 12-1 and 12-2, an alignment film 13 formed on the substrate surface and a sealing material 15, and is composed of a pair of substrates 12-1 and 12-2 and the sealing material 15. The liquid crystal is injected into the gap from the injection port 17 and sealed. The pair of substrates 12-1 and 12-2 are vertically offset in the XX direction and coincide vertically in the YY direction. The substrates 12-1 and 12-2 (actually formed alignment films 13 respectively) are pasted with a sealing material 15 at an interval of L1, and the outer peripheral end surface of the sealing material 15 and the substrates 12-1, 12- The outer peripheral end face of 2 is separated by L2.

  In the liquid crystal display element, moisture absorption and moisture intrusion cause deterioration in quality. Therefore, in order to improve moisture resistance, a moisture-proof film is formed on the end face of the alignment film and the surface of the sealing material. (See Patent Document 1)

  FIG. 3 is a schematic cross-sectional view of the liquid crystal display element disclosed in Patent Document 1. The same components as those in FIG. 4 are denoted by the same reference numerals. The liquid crystal display element 11 includes a pair of substrates 12-1 and 12-2, an alignment film 13, a liquid crystal 14, a sealing material 15, and a metal oxide moisture-proof film (hereinafter simply referred to as a moisture-proof film) 16. Has been. The moisture-proof film 16 is formed so as to cover at least a portion where the sealing material 15 and the alignment film 13 come into contact with outside air.

  As shown in FIG. 3, the moisture-proof film 16 of the liquid crystal display element 11 has an outer peripheral end surface of the sealing material 15 for bonding the pair of substrates 12-1 and 12-2 to the pair of substrates 12-1 and 12-2. This is a technique capable of forming a film only when reaching the outer peripheral end face.

  However, as shown in FIG. 4, when there is a certain distance L2 from the outer peripheral end surface of the sealing material 15 to the end surfaces of the pair of substrates 12-1 and 12-2, the outer peripheral end surface of the sealing material 15 is moisture-proof. It is difficult to form the film 16. In addition, film formation at a portion where the pair of substrates 12-1 and 12-2 is offset becomes more difficult. Although depending on the size of the liquid crystal display element, L1 shown in FIG. 4 is generally 1 μm to 5 μm, and L2 is 300 μm to 700 μm.

JP 2007-47253 A

  The moisture-proof film 16 is formed so as to cover at least a portion where the sealing material 15 and the alignment film 13 come into contact with the outside air, and the moisture-proof film 16 is generally formed by a vacuum deposition method and is formed in a desired place (at least In order to form a film on a portion where the sealing material 15 and the alignment film 13 come into contact with outside air), it is necessary to dispose the liquid crystal display element 11 so that the film can be formed vertically from a vapor deposition source. When the film is formed on the outer peripheral end surface of the film 15, the film forming material needs to penetrate into a portion that is much larger than the desired gap L1, so that it takes a long time to form the film. The temperature rises, causing a heat load on the liquid crystal 14 and causing a deterioration in quality due to the deterioration of the liquid crystal. In the conventional technique, when a certain distance L2 is required from the outer peripheral end surface of the sealing material 15 that bonds the pair of substrates 12-1 and 12-2 to the end surfaces of the pair of substrates 12-1 and 12-2. It is difficult to form a film on the outer peripheral end face of the sealing material 15 that is a certain distance ahead of the desired gap. In addition, in order to form a film on the outer peripheral end face of the sealing material 15 that is a certain distance ahead of a desired gap, it is necessary to form a film for a long time or to form a film-forming material during film formation such as RF vapor deposition. Processes that can cause heat loads are required. Furthermore, when the pair of substrates 12-1 and 12-2 are bonded to each other with an offset, it becomes more difficult to form a film on the outer peripheral end surface of the sealing material 15.

  The pixel electrode substrate and the transparent electrode substrate are arranged opposite to each other, an alignment film is provided on the inner surface of each of the pair of substrates, the pair of substrates are offset and bonded together in a desired gap, liquid crystal is put in the desired gap, and sealed. The liquid crystal display element is a liquid crystal display device, and a resin is applied to the outer peripheral end face of the sealing material for bonding the pair of substrates and the outer peripheral end face of the pair of substrates and cured, and an inorganic film is coated on the surface of the resin Liquid crystal display element.

  The inorganic film is a liquid crystal display element having moisture resistance and water resistance.

  At least a step of bonding the pair of substrates with a desired gap through a sealing material, a step of applying a resin to the outer peripheral end surface of the sealing material and the outer peripheral end surfaces of the pair of substrates, and curing the applied resin And a method of manufacturing a liquid crystal display device comprising a step of coating an inorganic film on the surface of the resin.

  In the resin application step, the liquid crystal display element and the resin are maintained at a desired temperature.

  According to the present invention, the outer peripheral end surface of the seal for bonding the pair of substrates is sealed in advance by sealing the distance from the outer peripheral end surface of the sealing material for bonding the pair of substrates to the outer peripheral end surface of the pair of substrates with the resin material. By eliminating the distance, it becomes possible to coat the sealed resin material with an inorganic film, and to limit the film formation target of the inorganic film coating to the resin material. By specializing the adhesion with the object, not only the resin material but also an inorganic film coating can be added, and a liquid crystal display element excellent in water resistance and moisture resistance can be manufactured.

  The pixel electrode substrate and the transparent electrode substrate are arranged opposite to each other, and an alignment film is provided on each inner surface of the pair of substrates. After the pair of substrates are offset and bonded with a desired gap, the desired electrode A liquid crystal display element in which liquid crystal is put in a gap and sealed, and a resin material such as an epoxy resin is infiltrated, cured, and sealed into the outer peripheral end face of the sealing material for bonding the pair of substrates and the outer peripheral end face of the substrate After that, a liquid crystal display element in which an inorganic film coating (for example, SiN excellent in water permeability) is applied to the surface of the epoxy resin agent is obtained.

  FIG. 1 is a cross-sectional view of a liquid crystal display element according to the present invention. Reference numeral 1 denotes a liquid crystal display element according to the present invention. After the alignment film 3 formed on the inner surface of the substrate and the pair of substrates 2-1 and 2-2 are bonded to each other with a desired gap, the liquid crystal 4 sealed in the desired gap, the pair of substrates 2 -1 and 2-2 are bonded to each other with a desired gap, a sealing material 5 that penetrates to the outer peripheral end surface of the sealing material 5, fills and seals the gap, and moisture resistance on the resin material 6. It consists of an inorganic coating film 7 formed to improve water resistance. Reference numeral 8 denotes an offset at the time of bonding the pair of substrates 2-1 and 2-2.

FIG. 2 is a diagram showing a method for manufacturing a liquid crystal display device according to the present invention, and shows sectional views for each process.
Step 1: A pair of substrates 2-1 and 2-2 are bonded together with a seal material 5 with a desired gap.
Step 2: Liquid crystal 4 is injected into the desired gap, and the injection port is sealed with a resin material. (Injection and sealing process not shown)
Step 3: Keep the pair of substrates 2-1 and 2-2 at a temperature of 50 ° C. The resin material 6 excellent in water resistance and moisture resistance is applied to the outer peripheral end surface of -2, and is osmotically cured to seal the desired gap. In this case, the resin material 6 is preferably an epoxy resin (for example, OG116 manufactured by EPOTECH).
Step 4: An inorganic film coating 7 is performed on the surface of the resin material 6 by vapor deposition. The inorganic film coating 7 is preferably, for example, a SiN inorganic film.

Sectional view of a liquid crystal display device according to the present invention (Example 1) It is a figure which shows the manufacturing method of the liquid crystal display element by this invention, and for every process (Example 2) Schematic cross-sectional view of a conventional liquid crystal display device BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the liquid crystal display element which concerns on this invention, a top view (A), XX sectional drawing (B), YY sectional drawing (C).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display element of this invention 2-1 board | substrate 2-2 board | substrate 3 alignment film 4 liquid crystal 5 sealing material 6 resin material 7 inorganic coating film 8 offset at the time of bonding 11 liquid crystal display element 12-1 board | substrate 12- concerning this invention 2 Substrate 13 Alignment film 14 Liquid crystal 15 Sealing material 16 Metal oxide moisture-proof film made of metal coupling agent

Claims (4)

  The pixel electrode substrate and the transparent electrode substrate are arranged opposite to each other, an alignment film is provided on the inner surface of each of the pair of substrates, the pair of substrates are offset and bonded together in a desired gap, liquid crystal is put in the desired gap, and sealed. The liquid crystal display element is a liquid crystal display device, and a resin is applied to the outer peripheral end face of the sealing material for bonding the pair of substrates and the outer peripheral end face of the pair of substrates and cured, and an inorganic film is coated on the surface of the resin A liquid crystal display element characterized by this.   The liquid crystal display element according to claim 1, wherein the inorganic film has moisture resistance and water resistance. At least a step of bonding the pair of substrates with a desired gap through a sealing material, a step of applying a resin to the outer peripheral end surface of the sealing material and the outer peripheral end surfaces of the pair of substrates, and curing the applied resin And a process of
A method of manufacturing a liquid crystal display element, comprising a step of coating an inorganic film on the surface of the resin.   4. The method of manufacturing a liquid crystal display element according to claim 3, wherein the liquid crystal display element and the resin are maintained at a desired temperature in the resin coating step.

Images