JPH0588143A - Liquid crystal type magic mirror - Google Patents

Abstract

(57) [Summary] [Structure] Transparent electrode layers 2a and 2b are arranged on the front and back surfaces of an organic dispersed liquid crystal layer 1 in which a liquid crystal 1a is dispersed in an organic polymer, and at least a front surface of the transparent electrode layer 2a is provided with a magic marker. A mirror 5 is provided, and when no voltage is applied to the transparent electrode layers 2a and 2b, the mirror 5 is in a mirror-like state.
A liquid crystal magic mirror that is in a transmissive state when a voltage is applied to it. [Effect] It is possible to electrically switch to mirror surface and transmission,
Furthermore, since the light transmittance during transmission is extremely high,
Excellent visibility. In addition, since the organic dispersion type liquid crystal layer has a film shape, a curved surface can be easily formed.
It becomes possible to create a two-dimensional electrically controlled magic mirror.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal type magic mirror capable of electrically controlling transmission and a mirror surface, and is used for a mirror for a house, a window glass, a glass for an automobile and the like.

[0002]

2. Description of the Related Art Conventionally, a magic mirror can see (transmit) the sight of a bright place when it is seen from a dark place, and on the contrary, when it sees a dark place from a light place, it cannot see the sight of a dark place and looks like a mirror surface. Thus, the transmission and the mirror surface are determined by the external environmental factors. Therefore, in order to be able to artificially switch between transmission and mirror surface, see SAIKAI 59-16676.
What was shown by the 9th publication was proposed. This is a magic mirror in which light is controlled by using a cell type TN type liquid crystal or a cell type guest-host type liquid crystal.

[0003]

However, the cell type TN
-Type liquid crystal or cell-type guest-host type liquid crystal has a light transmittance of less than 50% even when it is transparent (does not become completely transparent), so even if the liquid crystal is in a transparent state, a bright scene is hardly visible from a dark place. .. That is, the magic mirror using the cell type liquid crystal cannot bring out the excellent transmission performance of the magic mirror.

Therefore, the present invention has as its technical problem the solution of the above problems.

[0005]

[Means for Solving the Problems] A technical means for solving the above technical problem is to dispose a transparent electrode layer on the front surface and the back surface of an organic dispersed liquid crystal layer in which liquid crystals are dispersed in an organic polymer. And a magic mirror provided on at least one surface of the transparent electrode layer, which is in a mirror state when a voltage is not applied to the transparent electrode layer, and is in a transmissive state when a voltage is applied to the transparent electrode layer. It is a liquid crystal magic mirror.

[0006]

Embodiments of the present invention will be described below with reference to the drawings of FIGS.

FIG. 1 shows a sectional view of a liquid crystal film 4 according to the first embodiment. As shown in FIG. 1, the liquid crystal film 4 includes an organic dispersed liquid crystal layer 1 in which a liquid crystal 1a is dispersed in an organic polymer, and transparent electrode layers (ITO) bonded to the front and back surfaces of the organic dispersed liquid crystal layer 1. 2a, 2b and transparent electrode layer 2
PET attached to the front surface of a and the back surface of the transparent electrode layer 2b
It is composed of a resin film 3. The organic polymer includes thermosetting resins such as epoxy resin and polyurethane, acrylic resin, vinyl acetate resin, vinyl chloride resin,
Thermoplastic resins such as polycarbonate can be used.

FIG. 2 shows a sectional view of the electrically controlled magic mirror according to the first embodiment. As shown in FIG. 2, the electrically controlled magic mirror according to the first embodiment includes a liquid crystal film 4 and a magic mirror 5 bonded to the front surface of the liquid crystal film 4.

FIG. 3 is an explanatory view of the action of the liquid crystal type magic mirror according to the first embodiment when a voltage is not applied to the transparent electrode layer 2, where 6 is an observer in a dark place and 7 is a dark place. Observed object, 8 is an observed object in the light. When a voltage is not applied to the transparent electrode layer 2, the light transmittance is 20% and the liquid crystal film 4 is opaque, so that the observer 6 in the room (dark place) can see outside the room as shown in FIG. You cannot see Observatory 8 in (Bright). That is, in this case, the first embodiment
The liquid crystal type magic mirror becomes a mirror surface state, and the observer 6 in the room (dark place) sees the observation object 7 existing in the room.
Can see.

FIG. 4 is an explanatory view of the action of the liquid crystal magic mirror according to the first embodiment when a voltage of 70 V is applied to the transparent electrode layer 2. When a voltage of 70 V is applied to the transparent electrode layer 2, the light transmittance becomes 70% or more, and the liquid crystal film 4 becomes transparent. Therefore, as shown in FIG. Can see the observation object 8 existing outdoors (in the light). In other words, in this case, the liquid crystal magic mirror according to the first embodiment is in the transmissive state and exhibits the same operation as a normal magic mirror.

FIG. 5 is a sectional view of a liquid crystal type magic mirror according to the second embodiment. As shown in FIG. 5, the liquid crystal magic mirror according to the second embodiment includes the liquid crystal film 4 prepared in the first embodiment and the magic mirrors 5 bonded to the front and back surfaces of the liquid crystal film 4. ..

FIG. 6 is an explanatory view of the action of the liquid crystal magic mirror according to the second embodiment when a voltage is not applied to the transparent electrode layer 2, and 9 is an observer in the light. When no voltage is applied to the transparent electrode layer 2, the light transmittance is 20%.
Since the liquid crystal film 4 is opaque, the observer 6 in the room (dark place) cannot see the observation object 8 outside (light place), as shown in FIG. Light place)
The observer 9 in the room cannot see the observation object 8 in the room (dark place). That is, in this case, the liquid crystal magic mirror according to the second embodiment is in a mirror surface state.

FIG. 7 is an explanatory view of the operation of the liquid crystal magic mirror according to the second embodiment when a voltage of 70 V is applied to the transparent electrode layer 2. When a voltage of 70 V is applied to the transparent electrode layer 2, the light transmittance becomes 70% or more, and the liquid crystal film 4 becomes transparent. Therefore, as shown in FIG. 7, an observer 6 in a room (dark place) Can see the observation object 8 existing outdoors (in the light). In other words, in this case, the liquid crystal magic mirror according to the second embodiment is in the transmissive state and exhibits the same operation as a normal magic mirror.

FIG. 8 shows a sectional view of a liquid crystal type magic mirror according to the third embodiment. As shown in FIG. 8, the liquid crystal magic mirror according to the third embodiment has an organic dispersion type liquid crystal layer 1 in which a liquid crystal 1a is dispersed in an organic polymer, and a transparent type which is adhered to the front and back surfaces of the organic dispersion type liquid crystal layer 1. Electrode layer (ITO)
2a, 2b, the front surface of the transparent electrode layer 2a and the transparent electrode layer 2
It is composed of a magic mirror 5 arranged on the back surface of b.

The liquid crystal magic mirror according to the third embodiment exhibits the same operation as the liquid crystal magic mirror according to the second embodiment.

As described above, according to the present invention, when the voltage is not applied to the transparent electrode layer 2, the organic dispersion type liquid crystal layer 1 becomes opaque, so that it becomes a mirror surface state and a predetermined voltage is applied to the transparent electrode layer 2. In this case, the organic dispersion type liquid crystal layer 1 becomes transparent, so that the organic dispersion type liquid crystal layer 1 is in a transmissive state and exhibits the same action as a normal magic mirror.

Example 1 100 parts by weight of an acrylic resin (manufactured by Mitsubishi Rayon, trade name "Acrypet #VH") was dissolved in 500 parts by weight of methylene chloride. Liquid crystal 1a (manufactured by Merck, trade name "BDH E-44") was mixed with this solution in a weight ratio of 1: 1 to purify an organic dispersion type liquid crystal. On the other hand, by depositing on one side of the PET resin film 3 having a thickness of 50 microns, the transparent electrode layer (IT
O) 2a was formed. The organic dispersion type liquid crystal is applied on the surface of the transparent electrode layer 2a formed on one side of the PET resin film 3 with a bar coater to a thickness of 25 microns to form the organic dispersion type liquid crystal layer 1. did. After the methylene chloride was volatilized, the transparent electrode layer 2b formed again on one side of the PET resin film 3 was laminated so as to be in contact with the organic dispersion type liquid crystal layer 1 to prepare a liquid crystal film 4 as shown in FIG.

Next, as shown in FIG. 2, the liquid crystal film 4
A magic mirror 5 having a light transmittance of 15% was adhered to the front surface of the with a transparent adhesive. Table 1 shows the evaluation of the action of the liquid crystal magic mirror according to the first embodiment.

Example 2 A magic mirror 5 having a light transmittance of 40% was adhered to both sides of a liquid crystal film 4 similar to that of Example 1 with a transparent adhesive. Table 1 shows the evaluation of the action of the liquid crystal magic mirror according to the second embodiment.

[Embodiment 3] UV curable acrylic resin (manufactured by Toyo Ink Co., Ltd., trade name "Liocur AS-15"
3 ") and guest-host liquid crystal 1a (manufactured by Mitsui Toatsu Dye Co., Ltd., trade name" AS-M-137 ") were mixed at a weight ratio of 1: 1 to purify the organic dispersed liquid crystal. On the other hand, the transparent electrode layer 2a was formed by vapor deposition on one side of the magic mirror 5 having a light transmittance of 40%. On the surface of the transparent electrode layer 2a formed on one side of the magic mirror 5, an organic dispersion type liquid crystal was applied using a bar coater to a thickness of 25 μm to form an organic dispersion type liquid crystal layer 1. The transparent electrode layer 2b formed again on one side of the magic mirror 5 having a light transmittance of 40% was arranged so as to be in contact with the organic dispersed liquid crystal layer 1, and was irradiated with ultraviolet rays to be cured. Here, the ultraviolet ray is 1 at a distance of 150 mm using a high pressure mercury lamp of 2 kW.
Irradiate for 5 seconds. Table 1 shows the evaluation of the action of the liquid crystal magic mirror according to the third embodiment.

Comparative Example 1 A cell type liquid crystal layer was used in place of the organic dispersion type liquid crystal layer 1 of Example 1. Table 1 shows the evaluation of the action of the liquid crystal magic mirror according to Comparative Example 1.

[0022]

[Table 1]

[0023]

The present invention has the following effects because it uses an organic dispersion type liquid crystal layer in which liquid crystals are dispersed in an organic polymer.

Since it is possible to electrically switch to a mirror surface and transmission, and the light transmittance at the time of transmission is very high, the visibility is excellent. Further, since the organic dispersion type liquid crystal layer is in the form of a film, a curved surface can be easily formed, so that a three-dimensional electrically controlled magic mirror can be produced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid crystal film 4 according to a first embodiment.

FIG. 2 is a cross-sectional view of a liquid crystal magic mirror according to a first embodiment.

FIG. 3 is a first example when no voltage is applied to the transparent electrode layer 2.
FIG. 6 is an explanatory view of the operation of the liquid crystal magic mirror according to FIG.

FIG. 4 is an explanatory view of the action of the liquid crystal type magic mirror according to Example 1 when a voltage of 70 V is applied to the transparent electrode layer 2.

FIG. 5 is a sectional view of a liquid crystal magic mirror according to a second embodiment.

FIG. 6 is a second example when no voltage is applied to the transparent electrode layer 2.
FIG. 6 is an explanatory view of the operation of the liquid crystal magic mirror according to FIG.

FIG. 7 is an explanatory view of the action of the liquid crystal magic mirror according to the second embodiment when a voltage of 70 V is applied to the transparent electrode layer 2.

FIG. 8 is a sectional view of a liquid crystal magic mirror according to a third embodiment.

[Explanation of symbols]

 1 Organic dispersion type liquid crystal layer 1a Liquid crystal 2a, 2b Transparent electrode layer 4 Liquid crystal film 5 Magic mirror

Claims (1)

[Claims] 1. A transparent electrode layer is provided on the front surface and the back surface of an organic dispersion type liquid crystal layer in which liquid crystal is dispersed in an organic polymer, and a magic mirror is provided on at least one surface of the transparent electrode layer.
A liquid crystal magic mirror, which is in a mirror state when a voltage is not applied to the transparent electrode layer and in a transmissive state when a voltage is applied to the transparent electrode layer.