JPH0490510A - Compound board for display - Google Patents

Abstract

PURPOSE:To obtain the display compound board which is variable in the quantity of transmitted light or reflected light and has wide area and high strength by adhering and fixing a compound film which has a liquid crystal material in a spongy aggregate structure of transparent plastic and a couple of transparent conductive films on the surface of a transparent strength plate. CONSTITUTION:The compound film which holds the liquid crystal material 2 in the spongy aggregate structure 1 of transparent plastic is formed by casting a solution, prepared by adding a volatile solvent to the transparent plastic and liquid crystal material and then mixing them, on a glass substrate. The couple of the transparent conductive films 4 formed by vapor-depositing aluminum to film thickness which allows light transmission are adhered to the aggregate structure parts 1 on both surface of the compound film. Further, they are sandwiched between transparent strength plates 5 and the periphery of the transparent conductive film couple 4 is sealed and fixed through an insulating film to obtain a compound plate 3. A voltage is applied between the couple of the transparent conductive films to obtain the compound board for display. Consequently, the compound board for display is variable in the quantity of transmitted or reflected light and has the wide area and high strength.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a large-sized display composite board used for window glasses, skylights, advertising display boards, automobile window glasses, and the like.

(Prior Art) Conventional window glass cannot change the amount of transmitted or reflected light, so curtains and shutters are used in combination to block light. In the past, characters and designs were drawn on windows and advertising display boards with paint, but there was little change.Liquid crystal displays have recently been developed and put into practical use, but they are not suitable for use as display boards for displaying characters and designs. Although it had a function, it was impossible to manufacture large liquid crystal panels with a wide area, and since the liquid crystal part did not have any strength, it was difficult to handle and required double strength.

For example, it has never been used as window glass for houses, windows, advertising display boards, or passenger car windows. Electrochromic display boards also have the same problems as liquid crystal display boards. Large liquid crystal displays with large areas. The reason why it is difficult to manufacture and expand the use of display boards and large electrochromic display boards is as follows.
The distance between the electrode pairs could not be maintained at a predetermined value over the entire surface, and the areas where fluids such as liquid crystal and electrolyte were present lacked strength. In addition, color LCDs have recently been put into practical use, but they are extremely expensive and have an extremely small display area, making it even more difficult to solve the problems mentioned above. There is a demand for strong, inexpensive display boards that are versatile.

(Problems to be Solved by the Invention) A first object of the present invention is to provide a strong display composite plate with a wide area and a variable amount of transmitted light or reflected light. A second object of the present invention is to provide a display composite board that can display a wide variety of display contents and is inexpensive.

(Means for solving problems) The present invention is configured as follows.

l) The present invention is as shown in FIGS. 1 to 7.

A transparent plastic sponge-like agglomerated structure 1 is formed by casting a mixed solution of transparent plastic and one or more types of liquid crystal materials, or by casting a mixed solution of transparent plastic and one or more electrochromic materials and its electrolyte. A composite M3 containing the above liquid crystal material 2 or electrochromic material and its electrolyte 2 is formed, and both surfaces of this composite film are formed with a pair of transparent conductive films 4 on the transparent strength plate surface in a sponno-like agglomerated structure part. The pair of transparent conductive films 4 are fixed with adhesive, and the periphery of the pair of transparent conductive films 4 is sealed and fixed via an insulating film 6 to form a composite plate, and a voltage is applied between the pair of conductive films 4. This is a composite board for display.

As transparent plastics, it is desirable to use materials that have excellent transparency, are easy to handle, and can exhibit strength when used as a composite film. Examples include polycarbonate (PC), polyethylene (PE), and polypropylene (PP).

Polymethyl methacrylate (PMM^), polyethylene terephthalate (PET) or allyl diglycol carbonate, polyester, vinyl chloride, propylene, etc. are suitable as transparent plastics.

The liquid crystal material 2 may be any material that can deflect the molecular arrangement and change transmitted light or reflected light by applying a voltage.9 If the display content is limited in advance, an expensive electrode matrix structure is required. 8 In the present invention, preferably, the guest-host effect is used, the liquid crystal material 2 is used as a host, the dichroic dye is dissolved as a guest in the liquid crystal material 2, and the voltage It is preferable to display a variety of display contents by performing display using a change in the arrangement of dye molecules accompanied by a change in the arrangement of liquid crystal molecules upon application.

This pigment is a highly dichroic merocyanine type.

Styryl, azo, and azomethine dyes are suitable.

Dissolve one of the above transparent plastics in a solvent.

To this, one or more liquid crystal materials or one or more electrochromic materials and their electrolytes are added.

Preferably, one or both of them are made into fine droplets by forced stirring, and this mixed solution is cast on a substrate, spread and cast on a liquid surface, or as shown in Fig. 1.
The transparent plastic is solidified by casting directly onto the transparent conductive film 4 integrated with the transparent strength plate 5, resulting in a composite film containing the liquid in a spongy cohesive structure. Examples of this solvent include acetonitrile, benzonitrile, nitrobenzene, propylene carbonate, and tetrahydrofuran, as well as water if the transparent plastic is in a liquid state. Such a composite film 3 has a thickness of 2 to 100 from the viewpoint of optical purpose and ease of handling.
An appropriate mixing ratio can be selected for a thickness on the order of .mu.-. In order to not reduce the strength of the composite film and to fully demonstrate the function of keeping the transparent conductive films at a predetermined distance, the thickness of the composite film is 10%.
Desirably 0 μ or less.

When the mixed solution is directly cast onto the transparent conductive film 4 integrated with the surface of the transparent strength plate 5.

Depending on the type of solvent, the transparent conductive rIA4 may be dissolved, so it is best to take this into consideration when determining the plate thickness. By squeezing, spreading, and solidifying, the pair of transparent conductive glands are bonded together in the sponge-like cohesive structure, and the conductivity can be maintained within an acceptable range.

As the liquid crystal material 2 used in the present invention, it is preferable to mix a plurality of types to diversify the optical properties.If a plurality of liquid crystal materials with different threshold values are mixed or used in M layers, By changing the voltage, the liquid crystal can be driven in stages according to the type of liquid crystal, making it possible to further diversify the display.

In the present invention, a composite plate can contain a polymer liquid crystal material whose molecular orientation is fixed at the operating temperature and a low molecular liquid crystal material whose molecules can be deflected by applying a voltage. Polymer liquid crystal materials in this case include polyester, polyester carbonate, polyester amide, polyester imide,
Suitable materials include polyether, and by heating these in advance to near the glass transition temperature and applying a voltage to orient the molecules perpendicular to the film surface,2 it is possible to display even more diverse content and increase the strength of the composite film. You can make it bigger.

As the electrochromic material and its electrolyte 2, for example, tungsten dioxide (WO2) and dilute sulfuric acid (0,IN
Sulfonic acid proton conductor impregnated with organic solution of HaSO4) or L1 salt or water, Ir(OH))
+ and dilute sulfuric acid or an aqueous solution of LiN(h or Na0)1, tetrathifulvane L/
afulvalene, TTF) to a polymer (e.g. poly(vinyl benzyl chloride)
e)) An acetonitrile solution of a polymer color-forming material and its analogous compound bound to a chain and O, IN (C) I3) 4N-cloa.

bathophenanthroline disulfonic acid disodium salt
ulfonic acid disodium 5alt
(BPS2-Na2”)) and polycation (polyc
ation (e.g. + poly-methyl
Polymer iron complex + L obtained by immersing a modified electrode covered with an insoluble film formed from an aqueous solution of ethylene-Iine (MPEI)) in an aqueous solution containing an iron salt.
u-shiftalodianin (Lu)I (PC)2) and KCI
Aqueous solution 1 etc. can be used.

The pair of transparent conductive films 4 sandwiching both sides of the composite film and sealing and adhering the periphery are preferably transparent conductive films 4 that improve transparency by reducing the difference in refractive index with the above-mentioned transparent plastic. The thickness of the material should be determined by taking into consideration ease of handling and strength.2 For example, there is no need to worry about it being dissolved in a solvent or electrolyte (9 If strength is not required, for example, about 4 to 100μ-, and further strength can be added. The transparent strength plate 5 integrated with the transparent conductive film 4 may be made biaxially by blow-scene method or tenter method after melt extrusion using known methods. The plate is produced by stretching it in the length direction and width direction.The transparent strength plate 5 thus produced is coated with 2, for example, a polyester film, aluminum, gold, palladium, or silver.

Antimony-doped tin oxide, tin-doped indium oxide (ITO), cadmium stannate (CT
A type selected from O) is a vapor phase method, namely, a vacuum evaporation method, a sputtering method, an ion plating method, and a plasma C method.
A transparent conductive M4 having conductivity can be obtained by forming a vapor-deposited film that transmits light by a vD method or a photo-CVD method. Among these methods, the method of vacuum evaporating aluminum is the cheapest and most preferable, and glass can also be used as the transparent conductive film 4 if the later-described molding is not performed.

In the present invention, a conductive polymer can be used as the transparent conductive film 4. In this case, the vapor deposited film described above is not necessary.
As such a conductive polymer.

Polyacetylene (CH) x, polythiazyl (SN)
X, polypyrrole (Py), polythiophene (Py), etc. are suitable. Polyacetylene film, which has the simplest molecular structure, can be produced by, for example, making a material film using a responsive intermediate and heat-treating it to make a highly oriented polyacetylene film, or by heating acetylene gas with a highly concentrated Ziegler film. Obtained by exposure to Natsuta catalyst etc. For polythiazyl film and polydiacetylene film, 52 N2 or diacetylene crystals are created in advance and then heated and exposed to light.

Alternatively, it can be obtained by solid phase polymerization using radiation.

Polydiacetylene film can also be obtained by creating a single molecule of appropriately substituted diacetylene H on the surface of water, transferring it to a glass substrate, and polymerizing it6. Polypyrrole can be produced by dispersing pecI3 in a general-purpose polymer such as polyvinyl alcohol, and contacting it with the vapor of pyrrole monomer to polymerize it. A polypyrrole composite film with good translucency and conductivity can be obtained by the gas phase polymerization method. A polythiophene film can also be obtained in a similar manner.The conductive polymer film as the transparent conductive film 4 includes polypyrrole, polythiophene, polyparaphenylene, polysenophene,
In addition to polyfuran, polypyridazine, polyphenol, polycarbonate, etc., many other conductive polymer materials can be obtained by electrochemical polymerization. In other words, monomers to be polymerized and a suitable supporting electrolyte are placed in a suitable solvent. A conductive polymer film is grown on the electrode plates by applying a voltage between the electrode plates inserted into the electrode plate.

Acetonitrile is the solvent.

Polymerization using water as well as benzonitrile, nitrobenzene, propylene carbonate, and tetrahydrofuran is also possible. As an electrolyte, LiAsF5゜L+PFs+
NaClO4, tetrabutylammonium salt.

In addition to valatoluenesulfonic acid, soluble phthalocyanine, porphyrin, etc. can also be used. In addition, polythiophene, polypyrrole, polyfuran, polyselenophene, polytellurophene, etc. are FeCl3゜1lloC16, Ru
Polymerization can also be carried out using a catalyst such as Cl3. Further, graphite grown in a vapor phase on a glass plate or a polymer material plate, or film-like graphite obtained by heat-treating a polymer, can also be used as the conductive film. A soluble polyaniline film can also be used, which is (N)14)
After oxidative polymerization of aniline at low temperature in acidic conditions using 2S208.

Obtained by dedoping with ammonia. Note that when the conductive polymer is a powder, it may be applied onto other transparent polymers or glass surfaces using a transparent vehicle.

The transparent strength plate 5 used in the present invention is preferably made of polycarbonate (PC), polyethylene (PE), polypropylene (PP), or polymethyl methacrylate (PMMA).

Polyethylene, polyethylene terephthalate (PE
T) or allyl diglycol carbonate. The above-mentioned composite board for display is preferable, in which biaxially stretched transparent strength boards made of the same material and of the same thickness and whose strength directions are perpendicular to each other are bonded together on both sides.

All of these transparent strength plates have excellent transparency and high strength (
It is suitable as a strength member for transparent composite plates.

In order to reduce the strength anisotropy of a transparent strength plate, it is desirable to have a small strength anisotropy from the viewpoint of aging change and strength homogeneity.
After a transparent plate blank is extruded into a plate shape using an extruder, it is stretched in the width direction by a cross rolling method, or by gripping both ends of the plate material and stretching the width by a tenter method. Even in such a biaxially stretched transparent strength plate, although the strength anisotropy has been improved, the anisotropy remains. When such transparent plates are joined perpendicularly to each other, the anisotropy of the composite material is further improved.

As described above, by biaxially stretching the transparent conductive film 4 and the transparent strength plate 5 during the manufacturing process to improve the strength anisotropy, the transparent conductive film 4 and the transparent strength plate 5 can be formed in the subsequent process or used for a long period of time. It is possible to minimize the defects that occur when the two-display composite board is distorted and degrades in performance and aesthetic appearance, which tends to occur when the temperature exceeds the operating temperature.

In the present invention, the method for bonding the various transparent plates described above includes using the above-mentioned solvent that dissolves or activates at least one layer of material, or #! 1 etc. can be used.

In addition, in the display composite plate of the present invention, plate glass can be used as the transparent strength plate 5 when no molding process is performed.

Glass has no strength anisotropy and can prevent distorted deformation even when subjected to aging or heat.

2) The present invention casts a mixed solution of a transparent plastic and an electrolytic solution of an electrochromic material to form a composite film containing the electrolytic solution within a sponge-like aggregated structure of the transparent plastic. Both surfaces of the composite film are adhesively fixed in a sponge-like cohesive structure so as to be sandwiched between the transparent conductive film surface on which the vapor-deposited transparent conductive film is deposited and the other transparent conductive film surface, and an insulating film is placed around the pair of transparent conductive films. This composite board for display is characterized in that it is configured to be sealed and fixed through a pair of conductive films to form a composite board, and a voltage is applied between the pair of conductive films.

It is preferable to use the transparent conductive film described in section 1), but
The conductive vapor-deposited film is one that does not react with the electrolyte 1, such as gold,
It is best to choose palladium, silver, etc.

The electrochromic material deposited on this conductive surface is
Preferably those listed in section 1) include tungsten trioxide (WO3), Ir(OH)x, tetrathiafulvalene, T
A polymer coloring material in which TF) is bonded to a polymer chain, a similar compound thereof, etc. can be used.

When the electrochromic material is deposited on the conductive surface of the conductive film, the color development is clearer and the response speed is faster than in the case described in item 1), which is good.

3) The present invention is a composite plate for display according to the above item 1) or 2), characterized in that the liquid crystal material 2 and the electrochromic material coexist or are separated and superimposed.

For example, FIGS. 4 and 6 show an example in which liquid crystal material is superimposed, and FIG. 5 shows an example in which a liquid crystal material and an electrochromic material are superimposed. To drive a liquid crystal material, it is sufficient to apply a voltage, but to change color of an electrochromic material, an electrode, or a transparent conductive film, is configured so that a current flows in the electrolyte.

4) As shown in FIG. 6, the present invention has a structure in which a pattern or letters 7 that diffusely reflect or refract is carved on at least one surface of a transparent intensity plate, and visible light enters into this plate from its edge. The display composite board according to any one of items 1) to 3) above.

Although commonly used tools can be used to engrave the designs and letters, it is preferable to use a laser beam to melt or vaporize the surface layer (preferably in this location). It is preferable to coexist with a filler, a coloring agent, etc., and to color the material using the heat of the laser beam.

With this configuration, display contents can be made even more diverse.

5) In the present invention, the transparent conductive film is based on a biaxially stretched film selected from polyester, polycarbonate, polypropylene, polymethyl methacrylate, polyethylene terephthalate, or allyl diglycol carbonate, and is coated with aluminum, gold, The above-mentioned material is made of a thin film selected from palladium, silver, and antimony-doped tin oxide, tin-doped indium oxide, and cadmium stannate, which is vapor-deposited by a vapor phase method into a thin film that transmits light. It is preferable to use the display composite board as described in any one of items 1) to 4), and the above-mentioned material can be molded under reduced pressure. The circumferential insulating seal portion of the display composite board is pressed and held by the mold 9 to maintain the shape of the peripheral portion and uniformly deform, thereby creating a decompressed space 1 constituted by the mold and the central portion of the transparent plate.
It is preferable to reduce the pressure at 0 to the atmospheric pressure to reduce this space and mold it into a display composite board. In this case, the mold is simple and the equipment and work costs are low.

If the depth is adjustable by the mold depth adjusting plate 11, it becomes possible to mold display composite plates of various depths and shapes with a simple change of work.

6) As shown in FIG. 6, the present invention is characterized in that the fine round surface formed on at least one surface of the transparent plate and the plate surface facing this are adhered to each other, leaving a mesh-like channel 13; The display composite board according to any one of items 1) to 5) is characterized in that the display composite board has a structure that allows liquid to be ebbed and flowed repeatedly between the two board surfaces.

This liquid may be water, alcohol, oil, etc., as long as it is liquid at the operating temperature, and it is preferable that it be beautifully colored.
An example of a device for ebbing and flowing the liquid is a gas bag 14. A liquid bag 15 with a pressurizing device is arranged below, and the liquid bag pressurizes the liquid to rise into the flow path of the display surface, and this pressurization is released, or at the same time, the gas bag is pressurized to lower the liquid. It's good.

(Embodiment 1) A mixed solution of PMMA as a transparent plastic and a nematic liquid crystal material as a liquid crystal material by adding a volatile solvent is cast onto a glass substrate, and the liquid crystal material is placed in the sponge-like aggregate structure of the transparent plastic. A pair of PE films and transparent conductive films coated with aluminum to a thickness that allows light to pass through is adhered to the sponge-like cohesive structure on both sides of the composite film to be held, and this is further bonded with a PE transparent strength plate. The periphery of the pair of transparent conductive glands is sealed and fixed via an insulating film to form a composite plate, thereby obtaining a display composite plate configured to apply a voltage between the pair of transparent conductive films.

(Embodiment 2) A mixed solution of PMMA as a transparent plastic and a nematic liquid crystal material as a liquid crystal material by adding a volatile solvent is cast onto a glass substrate to form a liquid crystal material within the sponge-like aggregate structure of the transparent plastic. A composite membrane that retains
A pair of PE film transparent conductive film coated with gold to a thickness that allows light to pass through is adhered, and then this is sandwiched between PE transparent strength plates, and the periphery of the transparent conductive film pair is sealed and fixed via an insulating film to form a composite. A display composite board is obtained, which is configured to apply a voltage between the pair of transparent conductive films.

(Embodiment 3) A mixed solution of PP as a transparent plastic, tungsten dioxide (WO3) as an electrochromic material, and dilute sulfuric acid (0.1N H2S04) as an electrolyte is cast onto a glass substrate to make it transparent. A composite film that holds an electrochromic material and its electrolyte in a plastic sponge-like aggregate structure, and a transparent PE film with gold vapor-deposited on the light-transmitting Mll on the sponge-like aggregate structure on both sides of the composite membrane. Glue a pair of conductive films;
Further, this is sandwiched between PE transparent strength plates, and the periphery of the pair of transparent conductive films is sealed and fixed via an insulating film to form a composite plate, and a display device configured to apply a voltage between the pair of transparent conductive films. Get a composite board.

(Embodiment 4) A mixed solution of PP as a transparent plastic and dilute sulfuric acid (0.1N H2S04) as an electrolyte was cast on a glass substrate, and the electrolyte was poured into the sponge-like aggregate structure of the transparent plastic. A composite membrane is used to hold the membrane, and both sides of the composite membrane are coated with a sponge-like agglomerated structure.
A pair of transparent conductive films in which gold is deposited to a thickness that allows light to pass through the film and tungsten trioxide is roughly deposited is adhered to the film, and then this is sandwiched between PE transparent strength plates and these are adhered to form a single body. A display composite board is obtained, which is configured to apply a voltage between a pair of conductive films.

(Embodiment 5) The PE or PP used as the transparent strength plates used in Embodiments 1 to 4 are the same type of plates that are produced by rolling and develop strength anisotropy, and their maximum strength directions are orthogonal to each other.

(Embodiment 6) A colored film is cut and adhered to the outer surface of the transparent strength plate according to Embodiments 1 to 5 to form a design or characters, and visible light is emitted from the edge of the transparent strength plate to which this film is adhered. A light source is attached to the end face to allow light to enter.

(Embodiment 7) A design or character is engraved on one side of the transparent intensity plate according to Embodiments 6 to 6 using an arcuate laser beam, this part is colored, and visible light is emitted into the transparent intensity plate from its edge. A light source is attached to the end face to allow light to enter.

(Embodiment 8) The display composite plate according to any of Embodiments 1 to 7 is heated to 120°C to +70°C, and the periphery of the transparent plate is pressed against a mold to form a composite plate composed of the mold and the transparent plate. This space is reduced in pressure and molded by reducing the pressure difference from atmospheric pressure.

(Effects of the Invention) In the present invention, the sponge-like agglomerated structure of transparent plastic has the following functions.

(2) By including liquid crystals or electrolytes so that they can be handled in the same way as solids, this handling during the manufacture of composite boards is facilitated, making it easier to manufacture wide display boards.

(2) By adhering and fixing the transparent conductive film in the sponge-like cohesive structure, the distance between the pair of transparent conductive films is maintained at a predetermined value to stabilize the display.

■ By adhesively fixing the transparent conductive film in the sponge-like cohesive structure part, the strength of the display composite board is increased.
Enables manufacture and display of wide display boards.

The present invention further enables the following.

■By using a biaxially stretched transparent plate, distorted deformation can be prevented and strength can be increased.

■Displays can be made more diverse by overlapping multiple display materials and display means.

■Displays can be made more versatile by molding the display board surface9
Bending strength can also be improved.

As described above, the two aspects of the present invention make it possible to provide a display composite plate with a large area and strong strength, in which the amount of transmitted light or reflected light is variable. Further, according to the present invention, it is possible to provide an inexpensive display composite board with a variety of display contents.

[Brief explanation of the drawing]

1 to 8 are explanatory diagrams of the present invention. Figure 1 shows a composite film cast on a transparent conductive gland integrated into the surface of a transparent strength plate, and Figure 2 shows a transparent conductive membrane integrated into the surface of a transparent strength plate on a spongy aggregate of the material in Figure 1. Figure 3 shows a case where a pair of transparent strength plates are further bonded to the material shown in Figure 2. Figures 4 and 5 show the case where composite membranes are overlapped. Figure 6 shows a structure in which a design or text is engraved and the liquid can ebb and flow. Figure 7 is an enlarged view of the central part of Figure 2, and Figure 8
The figure is an explanatory diagram of the molding process. 1: Sponge-like aggregate structure of transparent plastic. 2: Liquid crystal material, mixed solution of electrochromic material and its electrolyte, electrolyte, 2a: Electrochromic material, 3: Composite film, 4: Transparent conductive film. Conductive film, conductive vapor deposited film, 5: Transparent strength plate. 6: Insulating film, 7: Diffuse reflection or refraction pattern or characters, 8: Light source, 9: Mold, 10: Decompressed space. 11: Mold depth adjustment plate, 12: Electrode lead wire.

Claims (1)

[Claims] 1. A transparent material can be produced by casting a solution of a mixture of a transparent plastic and one or more types of liquid crystal materials, or by casting a solution of a mixture of a transparent plastic and one or more electrochromic materials and its electrolyte. A composite film containing the liquid crystal material or electrochromic material and its electrolyte in a plastic sponge-like aggregate structure, and a transparent conductive film on a transparent strength plate surface on both sides of the composite film in the sponge-like aggregate structure. a pair of transparent conductive films, the periphery of the pair of transparent conductive films is sealed and fixed via an insulating film to form a composite plate, and a voltage is applied between the pair of conductive films. composite board. 2 A transparent conductive film in which a mixed solution of a transparent plastic and an electrolyte of an electrochromic material is cast to form a composite film containing the electrolyte in a sponge-like aggregated structure of the transparent plastic, and an electrochromic material is deposited by vapor deposition. Both surfaces of the composite film are adhesively fixed in a sponge-like cohesive structure so as to be sandwiched between the film surface and another transparent conductive film surface, and the periphery of this transparent conductive film pair is sealed and fixed via an insulating film. 1. A composite board for display, characterized in that it is a composite board and is configured to apply a voltage between the pair of conductive films. 3. The composite board for display according to claim 1 or 2, characterized in that the liquid crystal material and the electrochromic material coexist or are separated and superimposed. 4. The transparent intensity plate according to any one of claims 1 to 3, wherein at least one surface thereof is engraved with a pattern or characters that diffusely reflect or refract, and visible light is allowed to enter the plate from its edge. Composite board for display. 5 The transparent conductive film is made of polyester, polycarbonate,
The base material is a biaxially stretched film selected from polypropylene, polymethyl methacrylate, polyethylene terephthalate, or allyl diglycol carbonate, and tin oxide or tin doped with aluminum, gold, palladium, silver, or antimony. The display according to any one of claims 1 to 4, wherein one selected from doped indium oxide and cadmium stannate is vapor-deposited by a vapor phase method into a thin film that transmits light, thereby imparting conductivity. The composite board is heated to 120°C to 170°C, the peripheral insulating seal of the display composite board is pressed and held against a mold, and the space formed by the mold and the center of the transparent plate is depressurized to atmospheric pressure. Composite board for display is formed by reducing this space due to the pressure difference between the two. 6. A fine round surface formed on at least one surface of the transparent plate and the facing plate surface are bonded to each other leaving a mesh-like channel, and a structure that allows liquid to ebb and flow repeatedly between the two plate surfaces. The display composite board according to any one of claims 1 to 5, characterized in that: