JPS6169029A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent the permeation of gas into a liq. crystal display element by sticking polarizing plates each using polyvinyl alcohol as a polarizer to the liq. crystal display element and by forming coating films of polyvinylidene chloride. CONSTITUTION:An electrically conductive transparent film 41 is formed on one side of a polyether sulfone film 39 having about 100mum thickness represented by the formula. A urethane type anchor coating agent 38 is applied to the other side and dried, and vinylidene chloride resin is applied and dried to form a gas barrier layer 37. A polarizing plate 33 using polyvinyl alcohol having low gas permeability as a polarizer 35 is stuck, and a urethane type anchor coating agent 32 is applied and dried. A coating film 31 of vinylidene chloride resin is then formed. Thus, a liq. crystal display element preventing the generation of bubbles and the deterioration of the polarizing plates for a long period is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a plastic film type liquid crystal display element using a plastic film substrate.

<Prior Art> Fig. 2 shows the structure of a general plus film type i&crystal display element. In the figure, l is a polarizing plate, 2 is a plastic film substrate, 3 is an anchor layer, 4 is a transparent electrode,
5 is an alignment film, 6 is a sealing material, and 7 is a 2-night crystal.

The film used in M&amp;
Polyethylene tereph clay 1-film, polycarbonate film, polysulfone film, polyether I
Examples include resa μ phon film, polyether ether kent film, polyphenoxyate μ film, and polyarylate film.

However, glass film type liquid crystal display elements that use these plastic films as substrates have a much larger amount of gas permeation than liquid crystal display elements that use glass substrates, so gases in the air can trace the plastic film. Because of this, gas can accumulate inside the liquid crystal display element.
It is easy to be d.

At this time, if an external force is applied to the delastinoku film type liquid crystal display element or if it is exposed to heat 81q'l, the gas accumulated in the liquid crystal display element may form bubbles. On a plastic film substrate, for example, an organic pattern such as polyvinyl chloride '76 or polyvinyl alcohol, or even indium
By providing a gas barrier made of an inorganic film such as Tin Oxide (I To ), gas permeation through the plastic film substrate is blocked, gas intrusion into the liquid crystal display element is suppressed, and bubble generation is prevented. is being carried out.

Planutic film I with such a single layer of Kasbarrier
The structure of a REM type liquid crystal display element is shown in FIG.

In the figure, 11 is a polarizing plate (12: protective layer, 13: polarizer (Horibini!Realco/l/), 14: protective layer),
15 is a single layer of Ganupalya, 16 is an anchor 4, 17 is a plastic film substrate, 18 is a single anchor layer, 19 is a transparent electrode, 20 is an alignment film, 21 is a sealing material, and 22 is a liquid crystal.

However, even in liquid crystal display devices using plastic film substrates with a single layer of gas barrier, bubbles may occur during long-term tests, and the lifespan of plastic film type liquid crystal display devices may not be long enough. It wasn't.

On the other hand, a polarizing plate that imparts electro-optical characteristics to a liquid crystal display element is, for example, 40°C95%R,H, 55°C95q6
i:1' for a long time in a high temperature and high humidity atmosphere such as R, H,
If left as it is, there are problems in that the hydrolysis reaction causes discoloration and fading as well as a decrease in the degree of polarization.

<Purpose of the invention> The present invention has been made in view of the above problems.

That is, the present invention provides a night crystal display element that prevents gas permeation into a plastic film type liquid crystal display element and does not generate bubbles for a long time, and also prevents the deterioration of the polarizing plate in a high-temperature atmosphere. The purpose of this invention is to provide a plastic film type liquid crystal display element with high quality and long life.

<Structure of the Invention> The liquid crystal display element of the present invention is a plastic film type liquid crystal display element provided with a single layer of Ganupalya, after pasting a polarizing plate made of polyvinyl alcohol (PVA) t-polarizer, It is characterized by being provided with a vinylidene coating film.

<Example> Hereinafter, the present invention will be explained in detail based on the example.A polyether sulfone film with a thickness of 100 μm, which is represented by the general formula, is used as a film substrate. After forming a film and applying a urethane-based anchor coating agent to the other side and drying, apply vinylidene chloride resin "Furehalon Latex" manufactured by Kenbetsu Kagaku Kogyo Co., Ltd.
It was dried to form a gas barrier layer (this gas barrier layer may be made of polyvinylidene chloride, an organic film such as Bolihini-A-Corp, or an inorganic film such as ITO).

A liquid crystal display element was manufactured using a glass film substrate provided with a single layer of force barrier. Sample this/I
/A.

In order to impart electro-optical characteristics to this plastic film type liquid crystal display element, a front plate made of polyhinyl alcohol with low gas permeability as a polarizer was attached, and this was designated as Sun 1tuB.

Further, a urethane-based anchor coating agent was applied and dried on this surface, and then a vinylidene chloride resin [Flehalon Latex] manufactured by Kenbetsu Kagaku Kogyo Co., Ltd. was applied and dried to form a coating film. This is called sump/L/C.

Since this coating film has extremely low gas permeability and water vapor permeability, it simultaneously has the force-sparring effect and the effect of preventing deterioration of the polarizing plate due to hydrolysis in a high-temperature, high-humidity atmosphere.

These samples A, B, and C were subjected to accelerated tests by applying external force and thermal shock to examine the generation of bubbles, and the results shown in Table 1 below were obtained. In addition, for sample A, a plastic film type liquid crystal display element with a coating film formed without pasting a polarizing plate (this will be referred to as SUMP/I/D) and a glass film substrate without a curse barrier layer were used. The results of a plastic film-type liquid crystal display element to which no polarizing plate was attached (this will be referred to as sample E) are also included.

Table 1 As shown in Table 1 above, the plastic film type liquid crystal display device (SUN 7” A/C) embodying the present invention is different from the conventional plastic film type liquid crystal display device (SAMP/I/C) without a gas barrier layer. E), as well as compared to plastic film type liquid crystal display elements (samples lvA, B, and D) with a single layer of gas barrier.
No bubbles were generated, and a sufficient lifespan as a liquid crystal display element was obtained.

Next, for sample 1 of B and C above, 55°C 95% R
, H. When a plastic film type liquid crystal display element was left in an atmosphere and the deterioration of the polarizing plate was examined, the results shown in Table 2 below were obtained.

Table 2 As shown in Table 2, the plastic film type liquid crystal display element (Sump A/C) in which the present invention is implemented can be used in a high temperature and high humidity atmosphere compared to the conventional plastic film type liquid crystal display element (Sun 11vB). Among them, a high quality Nagano Mikoto glass film type liquid crystal display element with little deterioration of the polarizing plate was obtained.

FIG. 1 shows the structure of a plastic film type liquid crystal display element (Sump/l/C) in which the present invention is implemented.

In the figure, 31 is a polyvinylidene chloride film (coating PLA), 32 is an anchor layer, 33 is a four-light plate (34:
Protective layer, 35: polarizer (polyvinyl alcohol/L/),
36: protection M), 37 is a single layer of gas barrier, 38 is a single layer of anchor, 39 is a single Lanutic film substrate, 40 is a single layer of anchor, 41 is a transparent electrode, 42 is an alignment film, 43 is a sealing material, and 44 is a liquid crystal.

<Effects of the Invention> As explained above, according to the present invention, it is possible to obtain a liquid crystal display element of extremely high quality and long life, which does not generate bubbles over a long period of time and does not cause deterioration of the polarizing plate. It is something.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the structure of a plastic film type liquid crystal display element according to the present invention, Fig. 2 is a sectional view showing the structure of a conventional plastic film type liquid crystal display element, and Fig. 3 is a plastic film provided with a single layer of gas barrier. 1 is a cross-sectional view showing the structure of a film-type liquid crystal display element. Explanation of symbols 1: Polarizing plate, 2 Nigelastic film M plate, 3: 7th fj-M, 4: ffi light 1r, ! , 5: alignment film, 6: sealing material, 7: liquid crystal, 11: polarizing plate, 12: protection: lIM,
13: Polarizer, 14: Protective layer, 15: Ganubarya single layer,
16: Anchor single layer, 17: Destructive film board,
18: Anchor single layer, 19: Transparent electrode, 20: Alignment film, 2
1 - material, 22: liquid crystal, 31: polyvinylidene chloride film (coating film), 32: anchor single layer, 33: polarizing plate, 34: protective layer, 35: polarizer (polyvinyl alcohol)
) v ), 36: Protective layer, 37 Casbarrier layer, 38
: Anchor single layer, 39 Niblast film substrate, 40
．． Anchor single layer, 41: Transparent electrode, 42: Alignment film, 43;
Sea μ material, 44: Liquid crystal. Agent Patent attorney Aihiko Fuku (2 others) g/12
I/j', 545 7 Procedural amendment 7. To Δ November 6, 1982 1, Indication of the case Patent application 1981-192381, Title of invention Liquid crystal display element 3, Person making the amendment Relationship to the case Patent Applicant 4, Agent Address: 22-22 Nagaike-cho, Abeno-ku, Osaka, Kumo 645) % The above on page 5, line 4 of the statement of contents of the amendment

Claims (1)

[Claims] 1. In plastic film type liquid crystal display elements provided with a gas barrier layer, polyvinyl alcohol (PVA)
A liquid crystal display element characterized in that a polarizing plate having a polarizer as a polarizer is attached, and then a coating film of polyvinylidene chloride is provided.