JPS61130982A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Technical Field> The present invention provides a liquid crystal whose light transmittance is controlled by changing the voltage applied to the liquid crystal disposed in front of a mirror surface, thereby changing its reflectance. This invention relates to a liquid crystal device used in a type anti-glare mirror, and in particular relates to an improvement of a liquid crystal device in which liquid crystal is sealed between two transparent electrode substrates and a mirror surface is formed behind the transparent electrode substrate on the back side. It is.

<Prior art> Fig. 2+11, (21 and Fig. 3 ftl, (2
) shows the configuration of a conventional liquid crystal device.

The device shown in Figure 2 adopts the so-called "silver coating method", and in the figure, 1 is a liquid crystal element constructed by sealing liquid crystal between two transparent electrode substrates, and 2 is an Ag , 3 is Cu
54 is a backing coating.

Moreover, the one shown in FIG. 3 uses an A2 film, and in the same figure, 5 is a liquid crystal element having the same structure as the liquid crystal element 1, 6 is a 2 film, 7 is a 5i02 film, and 8 is the backing coating.

However, the conventional liquid crystal device described above has the following drawbacks.

In other words, if the liquid crystal device shown in Figure 2 is left in high temperature and high humidity for a long period of time, a blackening phenomenon of Ag called "shike" will occur, which will significantly reduce the commercial value of the mirror. There were drawbacks.

In addition, in the liquid crystal device shown in FIG. 3, A4 vapor deposited film,
Since the formation of the 5i02 film and the backing coating cannot be performed continuously (the Aλ film and the 5ioz film are formed in a vacuum, while the backing coating is formed in the atmosphere), the work is discontinuous. The drawback was that batch processing and processing increased costs. Furthermore, if the coating state of the backing film (for example, a mixture of alkyd melamine resin and rubber resin) is insufficient, the An film may be exposed to moisture or Deteriorated by
It has been confirmed that corrosion phenomena occur.

<Purpose of the Invention> The present invention has been made in view of the above-mentioned drawbacks of the prior art, and its purpose is to eliminate the phenomenon of film deterioration due to being left in high temperature and humidity, and the cost increase due to discontinuity in the manufacturing process. It is something.

<Structure of the Invention> The liquid crystal device for an anti-glare mirror of the present invention is a liquid crystal device in which a liquid crystal is sealed between two transparent electrode substrates, and a mirror surface is formed behind the transparent electrode substrate on the back side. , Art on its surface
The mirror surface is formed by pasting an organic polymer resin piece having a specular reflection layer made of , Ag, etc. on the back side of the back side transparent electrode substrate with a highly transparent adhesive. It is.

<Example> Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is a block diagram of an embodiment of the present invention.

A guest-host effect type liquid crystal element (phase change type) constructed by sealing a liquid crystal containing a dichroic dye between two transparent electrode substrates.
It has a structure in which an organic polymer resin piece 13 having a specular reflection layer 12 on its surface is attached to the back surface of I+ using a highly transparent adhesive 14.

The organic polymer resin piece 13 has a high temperature such as A°C and Ag.
) It is important that the surface on which the specular reflection layer 12 made of reflective metal is formed has excellent smoothness at least equal to or higher than that of a specular surface. Specifically, the level of unevenness on the surface is such that no matter which part of the surface is taken, the difference between the peaks and valleys is 0.2 μm.
It has the following smoothness.

Figure 4 shows a conceptual diagram.

Hereinafter, one reason for the above-mentioned 0.2 μm will be explained with reference to FIG.

In FIG. 5, Ill is a glass substrate constituting the liquid crystal element +1, 14 is an adhesive, 12 is a specular reflection layer made of A2 or the like, and 121 is its reflective surface.

Further, d is the distance between the glass surface and the reflective surface, α is the incident angle, and β is the refraction angle.

The difference from bright to bright or dark to dark in the interference fringes is di+1
d1=(λ/2)・(1/deposit β)・・・・・・・・・
......(1) (where λ is the wavelength of light), and the number of interference fringes for monochromatic light (2) is d i+
t di = (λ/2)・(1μβ)・2...
......It is expressed as (2).

From the above equation (2), the distance fljl(d) between the glass surface and the reflective surface is determined so that the number (2) of interference fringes is 1 or less. To simplify the comparison, assuming λ=5896^ and β=45°, when fi=1, d=4+68A=0.4168μm
becomes.

To make interference fringes less noticeable, it is best to set R(+), but it has been confirmed that if you set it to 2=05 or less, interference fringes are hardly noticeable to the human eye.1=0 When .5, d=0.2084μm, so d≦0.2μm
If so, the interference fringes will be at a level that is almost invisible to the human eye, making it possible to provide a liquid crystal device for an anti-glare mirror with extremely high display quality.

The organic polymer resin piece with a specular reflection layer used in this liquid crystal device is, for example,
There is one in which a highly reflective metal film such as Ag or the like is formed. Also,
The adhesive used is a material that does not cause any problems even when used in harsh environments such as onboard vehicles.

For example, use acrylic ester resin.

A liquid crystal device according to the present invention, in which a polyester film with an A2 film is attached to the back surface of a liquid crystal element using an adhesive made of an acrylic acid ester resin, and a conventional liquid crystal device (second
Comparative reliability data for the following methods (Fig. 3) are shown in the table below.

A method for attaching a piece of organic polymer resin with a specular reflection layer to the back surface of a liquid crystal element will be described below.

FIG. 6 is a diagram showing an outline of an apparatus for attaching an organic polymer resin piece with a specular reflection layer.

In the figure, reference numeral 21 denotes organic polymer resin pieces 22 with a specular reflective layer, each of which has an adhesive layer on its reflective surface, arranged on a carrier tape 23 at appropriate intervals, and a peeling tape 24 placed on top of the carrier tape 23. This is a tape for supplying an organic polymer resin piece with a specular reflection layer, and is wound around a roller for supplying the tape (not shown). 25 is a peeling roller;
6 is a peeling tape take-up reel, 27 is a liquid crystal element, 2
8 is a roller for rotating pasting (moves in the direction of the arrow in the figure),
29 is a carrier tape take-up reel.

Using the apparatus shown in the figure, the specular reflection layer-coated organic polymer resin piece 22 is pressure-transferred onto the back surface of the liquid crystal element 27 (this is carried out in the air or in a reduced pressure atmosphere).

Thereafter, it is left to stand at 40°C to 50°C for 30 to 60 minutes to increase the adhesive strength of the pressure-sensitive adhesive.

<Effect of the invention> According to the liquid crystal device of the present invention described in detail above, K.

Oh, wow. . 2 Ka, Aya 1. □7□ It is possible to provide a liquid crystal device for an anti-glare mirror.

In addition, the organic polymer resin body with a specular reflective layer also serves as a reinforcement material for the back side glass substrate, so the back side

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a liquid crystal device according to the present invention, Figure 2 (+)
, f2) and FIG. 3 f1), [21 is a configuration diagram of a conventional liquid crystal device, FIG. 4 is a conceptual diagram for explaining a liquid crystal device according to the present invention, and FIG. 5 is an explanation of a liquid crystal device according to the present invention. FIG. 6 is a diagram used to explain the manufacturing method of the liquid crystal device according to the present invention. Explanation of symbols ll Niguest host effect type liquid crystal element (phase change type), 12
, specular reflective layer, 13. Organic polymer resin piece, 14: Adhesive. Agent Patent Attorney Aihiko Fukushi (and 2 others) No. 212
1 $3 Figure 401

Claims (1)

[Claims] A liquid crystal device comprising a liquid crystal sealed between one or two transparent electrode substrates and a mirror surface formed behind the transparent electrode substrate on the rear side, the liquid crystal device having a specular reflection layer on its surface. A liquid crystal device characterized in that the above mirror surface is formed by pasting an organic polymer resin body to the back surface of a back side transparent electrode substrate using a highly transparent adhesive.