KR19980020094A - Film liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film liquid crystal display device having a simplified structure, wherein two substrates formed by stacking a plurality of thin film layers are spaced apart from each other at predetermined intervals to face each other and are disposed in the spaced space between the two substrates. In the liquid crystal display device comprising a liquid crystal, the substrate is formed on the polarizing plate to be a laminated matrix of the thin film layer, the upper and lower gas barrier layer, the upper gas barrier layer to block the moisture and gas inflow formed on the upper and lower surfaces of the polarizing plate Since the polarization plate is responsible for the local area of the conventional glass substrate and the film support plate made of a synthetic resin material, it is possible to provide a film liquid crystal display device having a thinner thickness and a simplified manufacturing process.

Description

Film liquid crystal display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film liquid crystal display device (LCD), and more particularly to a film liquid crystal display device having a simplified structure of a substrate.

The film liquid crystal display device uses a plastic support plate instead of the conventional glass substrate, and is widely used in portable and mobile devices because of its thin thickness, light weight, and excellent durability.

1 is a vertical cross-sectional view schematically showing the structure of a conventional film liquid crystal display device.

As shown, the conventional film liquid crystal display device has a liquid crystal layer 30 interposed between the upper substrate 10 and the lower substrate 20 formed of a plurality of thin film layers, and the upper substrate 10 and the lower substrate 20 On the exposed surface, the polarizing plates 11 and 21 are laminated.

Substituting the conventional glass substrate function in the laminated elements of each of the two substrates 10 and 20 disposed to face each other, the electrode adhesion layer starts from the first coating layer 12 including the film support plate 14 serving as the laminated mother body. It is a film laminated body corresponding to the area | region up to (16), and the thickness can manufacture to 0.1 mm or less. Such a film laminate must have moisture resistance and have adequate durability.

The polarization axes of the two polarizing plates 11 and 21 provided on the outer side of the upper and lower substrates 10 and 20 are related to the twist angle of the molecules of the liquid crystal layer 30 by driving the ITO electrode layers 17 and 27. In addition, an angle equal to the twist angle of the liquid crystal molecules or zero (each polarization axis is parallel) is selected. And it arrange | positions so that a liquid crystal aligning surface orientation direction and the polarization axis of the polarizing plates 11 and 21 may be parallel or orthogonal to each other normally.

The polarizing plates 11 and 21 mainly used for liquid crystal display elements are basic functions, and it is important to exhibit high polarization function and to have excellent appearance characteristics and durability. Durability is particularly important in view of the recent trend toward larger display areas. In order to satisfy such a function, the polarizing plates 11 and 21 for liquid crystal display devices currently supplied to the market are polarizers in charge of polarization characteristics, centered on halogen polarizers and dye polarizers. The mechanical strength to the direction is weak, shrinkage due to heat or moisture, or the polarization function is poor, so that it is sandwiched between supporting plates such as cellulose acetate (cellulose film) to fix such defects, and fixed with an adhesive.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultra-thin film liquid crystal display device in which the number of laminated films is reduced by using a polarizing plate having durability and support as a parent for laminating an ITO thin film or the like as described above.

1 is a vertical cross-sectional view schematically showing the structure of a conventional film liquid crystal display device.

Figure 2 is a vertical cross-sectional view schematically showing the structure of a film liquid crystal display device according to an embodiment of the present invention.

3 is an exploded perspective view showing the structure of the polarizing plate of the liquid crystal display of FIG. 2.

Explanation of symbols for the main parts of the drawings

10, 40: upper substrate 20, 50: lower substrate

11, 21, 43, 53: polarizing plates 12, 41: first coating layer

13, 42: upper gas barrier layer 14: film support plate

15, 44: lower gas barrier layer 16, 45: electrode adhesion layer

17, 27, 46: ITO electrode layer 30, 60: liquid crystal layer

In order to achieve the above object, in the film liquid crystal display device according to the present invention, two substrates formed by stacking a plurality of thin film layers are opposed to and disposed to be spaced apart from each other at predetermined intervals, and are injected into a space between the two substrates. A liquid crystal display device comprising a liquid crystal, the substrate comprising: a polarizing plate serving as a lamination matrix of the thin film layer; Upper and lower gas barrier layers formed on upper and lower surfaces of the polarizer to block moisture and gas from entering; And an ITO electrode layer formed on the upper gas barrier layer.

Hereinafter, a liquid crystal display device according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a vertical cross-sectional view schematically showing the structure of a film liquid crystal display device according to an embodiment of the present invention, Figure 3 is an exploded perspective view showing the structure of the polarizing plate of the liquid crystal display device of FIG.

2 and 3, a liquid crystal is interposed between two upper and lower substrates 40 and 50.

Since the upper and lower substrates 40 and 50, which are features of the present invention, are formed in the same stacked structure, the upper substrate 40 will be described below.

Upper and lower gas barrier layers 42 and 44 are disposed on upper and lower portions of the polarizing plate 43 serving as a support matrix in the upper substrate 40, and an electrode adhesion layer 45 is disposed below the lower gas barrier layer 42. ) And an ITO electrode layer 46 are provided, and a first coating layer 41 is provided on the upper gas barrier layer 42. The polarizing plate 41 is formed of a polarizer 43a and a support 43b adhered to upper and lower portions of the polarizer 43a.

In the above structure, the upper and lower gas barrier layers 42 and 44 are provided on the outer side of the polarizing plate 43 as an auxiliary layer for blocking the moisture resistance of the polarizing plate 43 and the transmission of contaminants in the gaseous state. The support 43b may be formed of a different material or the same material.

The first coating layer 41 is a surface layer formed on the outermost surface of the upper substrate 41 and is formed of a material having a high hardness to prevent the occurrence of scratches or scratches, and the electrode adhesion layer 45 is formed of the growth of the ITO electrode layer 46. It is introduced to make it effective.

The upper surface of the ITO electrode layer 46 is covered with an alignment film 47 for orienting liquid crystal molecules in a desired constant direction.

The polarizer 43 has a polarizer 43a interposed between two supports 43b. The polarizer 43a mainly uses a polyvinyl alcohol film compressed by a roller. The polarizer 43a is mainly manufactured by adsorbing a dichroic dye suitable for mass production and adhering to a polyvinyl alcohol that is capable of large area. Achieve. Since the polyvinyl alcohol is a water-soluble molecule, the optical properties are kept constant by water blocking of the support 43b and the upper and lower gas barrier layers 42 and 44.

Acetate cellulose-based film, polyester-based film, polycarbonate film, polysulfone film, etc. are applied to the support 43b for securing durability and mechanical strength of the polarizer 43a, and are attached by the polarizer 43a and an adhesive. . Such a polarizing plate 43 becomes a support matrix of a laminated structure. That is, in the fabrication of the liquid crystal display device, first, the upper gas barrier layer 42 and the first coating layer 41 are laminated on the polarizing plate 43, and then turned over, and the lower gas barrier layer 44 is sequentially disposed on the polarizing plate 43. After the electrode adhesion layer 45 and the ITO thin film layer 46 are formed, the ITO electrode layer 46 having the electrode pattern is formed by patterning, and the substrate 40 is manufactured by forming the alignment layer 47. .

An organic adhesive 61 such as a sealant is formed at a predetermined height around the edge of one of the two upper and lower substrates 40 and 50 manufactured as described above. One substrate 40 is bonded to each other, the liquid crystal is injected into the space formed at the height of the sealant 61 between the two substrates 40 and 50, and the inlet is sealed. do. Compared with the conventional manufacturing process, in the manufacture of the board | substrates 40 and 50, the process of adhering a polarizing plate to a film laminated body is abbreviate | omitted, and the thickness of a board | substrate becomes thin by omitting interposition of a film support plate.

As described above, the film liquid crystal display device according to the present invention has a thinner thickness, a simpler manufacturing process, and a material cost reduction effect by using the polarizing plate as a matrix of the laminated element.

Claims (5)

In the liquid crystal display device comprising a liquid crystal injected into the spaced space between the two substrates formed by stacking a plurality of thin film layers are spaced apart from each other at predetermined intervals, The substrate is A polarizing plate serving as a lamination matrix of the thin film layer; Upper and lower gas barrier layers formed on upper and lower surfaces of the polarizer to block moisture and gas from entering; And an ITO electrode layer formed on the upper gas barrier layer. The film liquid crystal display device according to claim 1, further comprising an electrode adhesion layer interposed between the lower gas barrier layer and the ITO electrode layer to facilitate growth of an ITO thin film. The film liquid crystal display device of claim 1, wherein the polarizing plate is formed of a polarizer and a support film bonded to both sides of the polarizer. The film liquid crystal display device according to claim 3, wherein the polarizer is made of polyvinyl alcohol. The film liquid crystal display device according to claim 1, wherein a first coating layer made of a material having a high hardness is formed on the upper gas barrier layer to prevent scratches by contact.