JPH0580315A - Light control panel - Google Patents

Abstract

PURPOSE:To improve heat resistance and to obviate the deterioration of a liq. crystal by providing a cavity layer at the upper part of a liq. crystal part and allowing the cavity layer to act as a heat-insulating layer to prevent the heating of the liq. crystal. CONSTITUTION:A liq. crystal layer 3 wherein a liq. crystal is dispersed in an org. polymer, a transparent electrode layer 2 adhered to the upper and lower surfaces of the liq. crystal layer 3, liq. crystal main bodies 4 and 40 consisting of the resin layers 1 and 6 adhered to the upper and lower surfaces of the transparent electrode layer 2 and glass sheets 5 and 8 arranged on at least one surface of the main bodies 4 and 40 are provided to constitute a light control panel. A voltage is impressed between the transparent electrode layers 2 to make the liq. crystal layer 3 transparent or opaque. In this light control panel, a cavity layer 11 is provided to the glass sheets 5 and 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control panel using a liquid crystal for reducing or cutting dazzling light, and is used for a sunroof of an automobile, a window frame for construction and the like.

[0002]

2. Description of the Related Art Conventionally, light control panels of this type have been disclosed in Japanese Utility Model Laid-Open No. 1-172029 and Japanese Patent Laid-Open No. 63-2878.
The one shown in Japanese Patent Publication No. 20 is known. The former is 2
Liquid crystal is sandwiched between flat glass cells.
By applying an electric field, the light reflectance is reduced and switching to the antiglare state is performed. On the other hand, in the latter, a liquid crystal film in which a liquid crystal is dispersed in a thermosetting one-component epoxy resin cured product is sandwiched between two flat glass plates.

[0003]

However, in the above two types of light control panels, when the glass surface is heated by sunlight, this heat is directly transferred to the liquid crystal layer, and the temperature of the liquid crystal rises. However, the characteristics of the liquid crystal deteriorate.

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 provide an organic dispersion type liquid crystal layer in which liquid crystals are dispersed in an organic polymer, and an organic dispersion type liquid crystal layer. A transparent electrode layer adhered to the upper and lower surfaces, a liquid crystal body composed of a resin layer adhered to the upper and lower surfaces of the transparent electrode layer,
Disposing a glass plate on at least one surface of the liquid crystal body,
In the light control panel which switches the organic dispersion type liquid crystal layer to transparent and opaque by applying a voltage between the transparent electrode layers, the light control panel is characterized in that a void layer is provided on the glass plate.

[0006]

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

FIG. 1 is a sectional view of a liquid crystal body 4 according to a first embodiment. As shown in FIG. 1, the liquid crystal body 4 includes an organic dispersion type liquid crystal layer 3 in which liquid crystals are dispersed in an organic polymer, and an organic dispersion type liquid crystal layer 3. Transparent electrode layers (IT
O) 2 and PET attached to the upper and lower surfaces of the transparent electrode layer 2
It is composed of a resin film 1.

FIG. 2 shows a light control panel 200 according to the first embodiment.
As shown in FIG. 2, the light control panel 200 according to the first embodiment is a glass having a liquid crystal body 4 and a void layer 11 bonded to the upper and lower portions of the liquid crystal body 4 and having one open surface. It is composed of a plate 5.

FIG. 3 is an explanatory diagram for curing the liquid crystal body 40 in the second embodiment. As shown in FIG. 3, the liquid crystal body 40 is an organic dispersion type liquid crystal layer in which liquid crystals are dispersed in an organic polymer. 3, the transparent electrode layer 2 adhered to the upper and lower surfaces of the organic dispersion type liquid crystal layer 3, the PET resin film 1 adhered to the upper surface of the transparent electrode layer 2, and the transparent electrode layer 2 adhered to the lower surface of the transparent electrode layer 2. And an acrylic resin plate 6.

FIG. 4 shows a light control panel 300 according to the second embodiment.
As shown in FIG. 4, the light control panel 300 according to the second embodiment includes a liquid crystal body 40 and the liquid crystal body 40.
And a glass plate 8 made of acrylic resin having a void layer 11 adhered to the upper part of the.

FIG. 5 shows a light control panel 400 according to the third embodiment.
As shown in FIG. 5, the light control panel 400 according to the third embodiment includes a liquid crystal body 4, a glass plate 5 having a void portion 11 adhered to the upper and lower portions of the liquid crystal body 4, and one side. The infrared cut layer 9 is adhered onto the surface of the glass plate 5 having the voids 11.

FIG. 6 is a sectional view of a light control panel according to Comparative Example 1, and FIG. 6 is a sectional view of a light control panel according to Comparative Example 2.

The present invention utilizes a light control panel in which the organic dispersion type liquid crystal layer 3 is switched between transparent and opaque by applying a voltage between the transparent electrode layers 2, and the liquid crystal bodies 4 and 4 are used.
By providing the void layer 11 on the upper part or the upper and lower parts of 0, heat is prevented from being transferred to the liquid crystal main bodies 4 and 40, and thermal deterioration of the liquid crystal is prevented.

In the present invention, the void layer 11 is a glass plate having one side open, but the void layer 11 may be present in the glass plate.

Example 1 100 parts by weight of an acrylic resin (trade name "Acrypet #VH" manufactured by Mitsubishi Rayon Co., Ltd.) was dissolved in 500 parts by weight of methylene chloride. Liquid crystals (manufactured by Merck, trade name "BDH E-44") were mixed with this solution in a weight ratio of 1: 1 to produce organic dispersed liquid crystals. On the other hand, a transparent electrode layer (ITO) is formed by vapor deposition on one side of the PET resin film 1 having a thickness of 50 microns.
Formed 2. On the surface of the transparent electrode layer (ITO) 2 formed on one side of the PET resin film 1, an organic dispersion type liquid crystal is applied by a bar coater to a thickness of 25 μm and volatilized methylene chloride. It was Then PE
A transparent electrode layer (ITO) 2 formed again on one side of the T-resin film 1 was bonded so as to be in contact with the organic dispersion type liquid crystal layer 3 to prepare a liquid crystal body 4 as shown in FIG.

Next, as shown in FIG. 2, the liquid crystal main body 4 was sandwiched between two glass plates 5 having the void layer 11 and bonded with an adhesive. Table 1 shows the evaluation of the performance of the light control panel 200 formed as described above.

[Example 2] UV-curable acrylic resin (manufactured by Toyo Ink Co., Ltd., trade name "Liocur AS-15"
3 ") and guest-host liquid crystal (Mitsui Toatsu Dye, product name" AS-M-137 ") were mixed in a weight ratio of 1: 1 to produce an organic dispersion liquid crystal. On the other hand, by vapor deposition on one side of the acrylic resin plate 6, the transparent electrode layer (I
TO) 2 was formed. On the surface of the transparent electrode layer (ITO) 2 formed on one side of the acrylic resin plate 6, an organic dispersion type liquid crystal was applied with a bar coater to a thickness of 15 μm. On the other hand, a transparent electrode layer (ITO) 2 was formed by vapor deposition on one side of a PET resin film 1 having a thickness of 50 μm. After that, a transparent electrode (ITO) 2 formed on one side of the PET resin film 1 is arranged so as to be in contact with the organic dispersion type liquid crystal layer 3, and as shown in FIG. Then, the liquid crystal body 40 was prepared by curing. Here, the ultraviolet ray is 2k
Irradiation was performed for 15 seconds at a distance of 150 mm using a high pressure mercury lamp of w.

Next, as shown in FIG. 4, a glass plate 8 made of acrylic resin having a void layer 11 was adhered onto the surface of the liquid crystal body 40 with an adhesive. Table 1 shows the evaluation of the performance of the light control panel 300 formed as described above.

[Embodiment 3] In order to reduce the amount of transmitted infrared rays, as shown in FIG. 5, sunlight is directly irradiated to the light control panel 200 according to Embodiment 1, while the void layer 1 is provided.
The infrared cut layer 9 was formed by depositing 0.1 micron of gold on the surface of the glass plate 5 having No. 1. Table 1 shows the evaluation of the performance of the light control panel 400 thus formed.

Comparative Example 1 Light control panel 2 according to Example 1
In 00, a glass plate 10 having flat surfaces on both sides was used instead of the glass plate 5 having a void layer 11. Table 1 shows the evaluation of the performance of the light control panel according to Comparative Example 1.

[Comparative Example 2] In order to reduce the amount of infrared rays transmitted, the surface of the glass plate 10 which is flat on both sides of the light control panel according to Comparative Example 1, which is directly irradiated with sunlight, has an intensity of 0.
The infrared cut layer 9 was formed by depositing 1 micron of gold. Table 1 shows the evaluation of the performance of the light control panel according to Comparative Example 2.

From Table 1, it can be seen that in Examples 1 to 3, the temperature of the organic dispersion type liquid crystal layer 3 did not rise so much. Further, it has excellent heat resistance, and there is no fear that the liquid crystal will deteriorate. On the other hand, in Comparative Examples 1 and 2, the organic dispersed liquid crystal layer 3
The temperature rises so much that the liquid crystal does not work properly and the function of adjusting the light cannot be achieved. Then, the light control panel 400 according to the third embodiment in which the glass plate 5 having the two void layers 11 is used and the infrared cut layer 9 is formed on the surface of the upper glass plate has a structure in which heat is most difficult to be transmitted to the liquid crystal body 4. I understand that.

[0023]

[Table 1]

[0024]

The present invention has the following effects because the cavity layer is provided above the liquid crystal portion.

The cavity layer acts as a heat insulating layer and prevents the temperature of the liquid crystal part from rising, so that the heat resistance is improved and the liquid crystal is not deteriorated.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a light control panel 200 according to a first embodiment.

FIG. 3 is an explanatory diagram when the liquid crystal body 40 is cured in Example 2.

FIG. 4 is a sectional view of a light control panel 300 according to a second embodiment.

FIG. 5 is a sectional view of a light control panel 400 according to a third embodiment.

FIG. 6 is a cross-sectional view of a light control panel according to Comparative Example 1.

7 is a sectional view of a light control panel according to Comparative Example 2. FIG.

[Explanation of symbols]

 1 PET resin film (resin layer) 2 transparent electrode layer 3 organic dispersion type liquid crystal layer 4,40 liquid crystal body 5,8 glass plate 6 acrylic resin plate (resin layer) 9 infrared cut layer 11 cavity layer 200, 300, 400 tone Light panel

Claims (1)

[Claims] 1. An organic dispersed liquid crystal layer in which liquid crystals are dispersed in an organic polymer, transparent electrode layers adhered to the upper and lower surfaces of the organic dispersed liquid crystal layer, and upper and lower surfaces of the transparent electrode layer. A liquid crystal main body made of a resin layer attached to the liquid crystal body, and a glass plate on at least one surface of the liquid crystal main body,
A light control panel for switching the organic dispersed liquid crystal layer between transparent and opaque by applying a voltage between the transparent electrode layers, characterized in that a void layer is provided on the glass plate.