JP3676478B2 - Manufacturing method of liquid crystal display device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a handwritten input type liquid crystal display device that has low reflection loss, is excellent in visibility, and can be removed and replaced with a transparent protective plate.
[0002]
[Prior art]
Conventionally, as shown in FIG. 2, a transparent protective plate 1 such as a doublet plate for detecting an input position is arranged on the viewing side of the liquid crystal display panel 3 through a gap 5 by a frame spacer or the like, and characters, patterns, etc. There has been proposed a liquid crystal display device that can input a document and display the input content on a liquid crystal display panel. The gap 5 between the liquid crystal display panel and the transparent protective plate is intended to prevent the display quality from being deteriorated due to local pressure applied to the liquid crystal display panel by the writing pressure at the time of handwriting input via an input pen or the like. It is. However, such a gap forms an air layer between the liquid crystal display panel and the transparent protective plate, and there is a problem that the reflection loss of light at the interface between them is large and the visibility of the display panel is lowered.
[0003]
In view of the above, proposals have been made to interpose a transparent adhesive sheet for reducing reflection loss or a curable silicone gel in place of the frame spacer or the like. However, in the adhesive sheet, the liquid crystal display panel and the transparent protective plate are bonded and fixed, and when the transparent protective plate is cracked or scratched by pen input etc., it is not possible to peel and replace only the transparent protective plate, There was a problem that the liquid crystal display device had to be replaced. On the other hand, the curable silicone gel is inferior in long-term adhesiveness based on adhesive force, and there is a problem that air bubbles are generated due to a decrease in adhesive force, transparency is lowered and visibility is lowered.
[0004]
In addition, the above-described sheet interposition method has a problem that air bubbles are likely to be mixed when the liquid crystal display panel and the transparent protective plate are brought into close contact with each other through the sheet. Poses a problem of lowering the visibility due to the above-mentioned reflection loss and lowering of transparency.
[0005]
[Technical Problem of the Invention]
The present invention makes use of the advantage of the sheet system in which no air layer is interposed between the liquid crystal display panel and the transparent protective plate, and the bubble without reducing the optical characteristics of the intervening sheet when the liquid crystal display panel and the transparent protective plate are in close contact with each other. In addition to being able to prevent long-term adhesion, it is possible to prevent deterioration of transparency and visibility due to the generation of bubbles for a long period of time, and it is possible to easily remove and replace the transparent protective plate. An object of the present invention is to develop a method for manufacturing a liquid crystal display device such as a handwriting input type that has low reflection loss and excellent visibility.
[0006]
[Means for solving problems]
The present invention has a viscosity of 10 cp or less at which the sheet is not swelled or dissolved between the transparent resin sheet and one or both of the liquid crystal display panel and the transparent protective plate via a transparent resin sheet made of a plasticizer-containing acrylic polymer. in a state in which the deployed volatile liquid, provide a method of manufacturing a liquid crystal display device After brought into close contact with the visible side and the transparent protective plate of a liquid crystal display panel, characterized that you drying treatment warming押加pressure To do.
[0007]
【The invention's effect】
By using a plasticizer-containing polymer, it is possible to obtain a weakly adhesive transparent resin sheet having a buffering property, and by using the above configuration, the liquid crystal display panel and the transparent protective plate are overlapped and adhered through a volatile liquid. In addition, it is possible to easily superimpose and adhere to the transparent resin sheet without deteriorating the optical characteristics and without mixing bubbles at the interface, and can greatly reduce the reflection loss of light at the superimposed interface, and has excellent visibility. Liquid crystal display devices for various uses such as a book input type can be obtained. Further, since the transparent resin sheet is weakly adhesive, it can be easily removed again, and based on this, the transparent protective plate can be easily peeled and replaced. Further, such a transparent resin sheet is excellent in long-term adhesion, and prevents deterioration in transparency and visibility due to generation of bubbles at the overlapping interface for a long period of time.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the production method of the present invention, the viscosity is such that the sheet is not swelled / dissolved between the transparent resin sheet and one or both of the liquid crystal display panel or the transparent protective plate via the transparent resin sheet made of a plasticizer-containing acrylic polymer. In a state where a volatile liquid of 10 cp or less is provided, the viewing side of the liquid crystal display panel and the transparent protective plate are brought into close contact with each other, and then subjected to a drying treatment under heating and pressing to obtain a liquid crystal display device. An example of a liquid crystal display device manufactured by such a method is shown in FIG. 1 is a transparent protective plate, 2 is a transparent resin sheet, and 3 is a liquid crystal display panel. Reference numeral 4 denotes an illumination system including a reflector and a backlight system.
[0009]
In the present invention, the transparent resin sheet is formed of a plasticizer-containing acrylic polymer. Thereby, the weak adhesive transparent resin sheet which has buffering property is obtained. Its buffering property makes it possible to protect the liquid crystal display panel from impacts caused by falling objects or writing pressure when entering handwriting. From this point, the preferred sheet thickness is 10 μm to 5 mm, especially 20 μm to 3 mm. .
[0010]
In addition, the weak adhesion of the transparent resin sheet enables the transparent protective plate to be peeled off from the liquid crystal display panel to facilitate its replacement. A transparent resin sheet of 200 gf / 20 mm or less, especially 5 to 150 gf / 20 mm, particularly 10 to 100 gf / 20 mm is preferable. The adhesive strength conforms to JIS C 2107.
[0011]
Further, from the viewpoint of reducing reflection loss at the overlapping interface, a transparent resin sheet having a refractive index difference with respect to each surface layer of the liquid crystal display panel and the transparent protective plate can be preferably used. On the other hand, the transparency of the transparent resin sheet is preferably 5 or less, particularly 2 or less, based on the haze value based on JIS K 6714 in terms of light transmittance.
[0012]
Formation of the transparent resin sheet, such as with a resin having a low refractive index difference with respect to both light of the above example, a liquid crystal display panel and the transparent protective plate, an acrylic polymer having an acrylic monomer having an A acrylic group or a methacrylic group as component Ru can be carried out using.
[0013]
Specific examples of the acrylic polymer include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, t-butyl group, isobutyl group, pentyl group, isopentyl group, hexyl group, heptyl group, cyclohexyl group, Linear or branched such as 2-ethylhexyl group, octyl group, isooctyl group, nonyl group, isononyl group, decyl group, undecyl group, lauryl group, tridecyl group, tetradecyl group, stearyl group, octadecyl group, decanyl group, isodecanyl group An alkyl group, in particular, an ester of acrylic acid or methacrylic acid having an alkyl group having 30 or less carbon atoms, or a part of the alkyl group substituted with a hydroxyl group, such as 2-hydroxyethyl (meth) acrylate or (meta ) 2-hydroxypropyl acrylate, (meth) acrylic 4-hydroxybutyl, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate and (4-hydroxymethyl And those obtained by polymerization using one or more of hydroxyl group-containing monomers such as (cyclohexyl) -methyl acrylate as a main component.
[0014]
In the polymerization of the acrylic polymer, an appropriate monomer that can be copolymerized for the purpose of modifying physical properties such as optical properties and heat resistance can be used in combination as necessary. Examples of such monomers include acrylic acid and methacrylic acid, carboxyethyl acrylate and carboxypentyl acrylate, itaconic acid and maleic acid, carboxyl group-containing monomers such as fumaric acid and crotonic acid, or acid anhydrides such as maleic anhydride and itaconic anhydride. Monomer, styrene sulfonic acid, allyl sulfonic acid, 2- (meth) acrylamide-2-methylpropane sulfonic acid, (meth) acrylamide propane sulfonic acid, sulfopropyl (meth) acrylate and (meth) acryloyloxynaphthalene sulfonic acid Examples thereof include sulfonic acid group-containing monomers and phosphoric acid group-containing monomers such as 2-hydroxyethylacryloyl phosphate.
[0015]
Also, (N-substituted) amides such as (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, and N-methylolpropane (meth) acrylamide. Monomers, (meth) acrylic acid aminoethyl, (meth) acrylic acid N, N-dimethylaminoethyl, (meth) acrylic acid alkylaminoalkyl monomers such as t-butylaminoethyl, (meth) acrylic (Meth) acrylic acid alkoxyalkyl monomers such as methoxyethyl acid and ethoxyethyl (meth) acrylate, maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide and N-phenylmaleimide, N- Methylita Itacimide monomers such as N-imide, N-ethylitaconimide, N-butylitaconimide, N-octylitaconimide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, N-laurylitaconimide, N- (meth) Succinimide monomers such as acryloyloxymethylene succinimide, N- (meth) acryloyl-6-oxyhexamethylene succinimide, and N- (meth) acryloyl-8-oxyoctamethylene succinimide are also examples of monomers for modification.
[0016]
Furthermore, vinyl acetate, vinyl propionate, N-vinyl pyrrolidone, methyl vinyl pyrrolidone, vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl oxazole, vinyl morpholine, N-vinyl carboxylic acid amide. , Vinyl monomers such as styrene, α-methylstyrene, N-vinylcaprolactam, cyanoacrylate monomers such as acrylonitrile and methacrylonitrile, epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate, (meth) acrylic Polyethylene glycol acid, polypropylene glycol (meth) acrylate, methoxyethylene glycol (meth) acrylate and methoxypolypropylene (meth) acrylate Examples of monomers intended for modification include glycol-based acrylic ester monomers such as recall, tetrahydrofurfuryl (meth) acrylate and fluorine (meth) acrylate, and acrylic acid ester monomers such as silicone (meth) acrylate and 2-methoxyethyl acrylate. It is given as.
[0017]
In addition, a polyfunctional monomer may be used for the purpose of crosslinking treatment. Examples include hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth). Examples include acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, epoxy acrylate, polyester acrylate, and urethane acrylate.
[0018]
The acrylic polymer can be prepared, for example, by applying an appropriate method such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, or a suspension polymerization method to a mixture of one or more monomers. . In the bulk polymerization method, a polymerization method by irradiation with radiation such as ultraviolet rays and electron beams can be applied, and an addition polymerization method using a solution polymerization method and a radiation polymerization method in combination can also be applied. In the crosslinking treatment, an appropriate method such as an internal crosslinking method or an external crosslinking method can be applied. The internally crosslinked acrylic polymer can be prepared by using, for example, the above-described polyfunctional monomer and applying a radical polymerization method using a thermal polymerization initiator or a radiation polymerization method using a photopolymerization initiator. On the other hand, external cross-linking can be performed by a method in which an intermolecular cross-linking agent is blended in an acrylic polymer solution or the like and formed into a sheet, followed by a heat treatment method or a radiation irradiation method. A monomer that improves adhesive strength, such as acrylic acid and methacrylic acid, is used in an amount that does not impair the above-described weak adhesion.
[0019]
Incidentally, examples of the thermal polymerization initiator include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate and di (2-ethoxyethyl). ) Organic peroxidation such as peroxydicarbonate, t-butylperoxyneodecanoate, t-butylperoxybivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane 1-carbonitrile) and 2,2′-azobis ( 2,4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethyl-4-methoxyvale) Nitrile), dimethyl 2,2′-azobis (2-methylpropionate), 4,4′-azobis (4-cyanovaleric acid), 2,2′-azobis (2-hydroxymethylpropionitrile), And an azo compound such as 2,2′-azobis [2- (2-imidazolin-2-yl) propane].
[0020]
Examples of the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, α-hydroxy-α, α′-dimethylacetophenone, methoxyacetophenone, and 2,2-dimethoxy. Acetophenone compounds such as 2-phenylacetophenone, 2,2-diethoxyacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) -phenyl] -2-morpholinopropane-1, benzoin Benzoin ether compounds such as ethyl ether, benzoin isopropyl ether and anisoin methyl ether, α-ketol compounds such as 2-methyl-2-hydroxypropiophenone, ketal compounds such as benzyldimethyl ketal, 2-naphthalenesulfonyl The Aromatic sulfonyl chloride compounds such as Lido, photoactive oxime compounds such as 1-phenone-1,1-propanedione-2- (ο-ethoxycarbonyl) oxime, benzophenone and benzoylbenzoic acid, 3,3′-dimethyl Benzophenone compounds such as -4-methoxybenzophenone, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2 Thioxanthone compounds such as 1,4-diethylthioxanthone and 2,4-diisopropylthioxanthone, camphorquinone, halogenated ketone, acyl phosphinoxide, acyl phosphonate and the like.
[0021]
As the polymerization initiator, potassium persulfate, ammonium persulfate, hydrogen peroxide, or the like, or a redox initiator using these in combination with a reducing agent may be used.
[0022]
On the other hand, examples of intermolecular crosslinking agents include polyfunctional isocyanate-based crosslinking agents such as tolylene diisocyanate, trimethylolpropane tolylene diisocyanate, diphenylmethane triisocyanate, polyethylene glycol diglycidyl ether, diglycidyl ether, trimethylolpropane triglycidyl ether. Such epoxy-based crosslinking agents, melamine resin-based crosslinking agents, metal salt-based crosslinking agents, metal chelate-based crosslinking agents, amino resin-based crosslinking agents, and peroxide-based crosslinking agents.
[0023]
The formation of the transparent resin sheet may be performed by an appropriate method such as a method in which the transparent resin is spread on the separator as a solution with a solvent or the like as necessary, and a separator is further placed on the spread layer to form a sheet. it can. The separator can be obtained by a method in which a thin leaf body such as a film is surface-treated with a release agent. The adjustment of weak adhesion in the transparent resin sheet can be performed by an appropriate method such as selection of monomer components, but the good adhesion of the sheet to the liquid crystal display panel and the transparent protective plate and the buffering property of the sheet are also considered. A preferred method is a method of blending a plasticizer.
[0024]
Any suitable plasticizer can be used. Examples include dimethyl phthalate and diethyl phthalate, dibutyl phthalate and diheptyl phthalate, di-2-ethylhexyl phthalate and diisononyl phthalate, diisodecyl phthalate and dibutyl benzyl phthalate, dioctyl phthalate and butyl phthalyl. Phthalic acid compounds such as butyl glycolate, adipic acid compounds such as diisobutyl adipate and diisononyl adipate, diisodecyl adipate and dibutoxyethyl adipate, sebacic acid compounds such as dibutyl sebacate and di-2-ethylhexyl sebacate Compounds, phosphoric acid compounds such as triethyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl phenyl phosphate, fatty acid compounds such as dioctyl sebacate and methylacetylricinoleate , Epoxy compounds such as diisodecyl-4,5-epoxytetrahydrophthalate, trimellitic compounds such as tributyl trimellitic acid, tri-2-ethylhexyl trimellitic acid, tri-n-octyl trimellitic acid and triisodecyl trimellitic acid Other examples include butyl oleate, chlorinated paraffin, polybutene and polyisobutylene.
[0025]
The blending amount of the plasticizer can be appropriately determined according to the type of the plasticizer and the type of the transparent resin. Generally, 5 to 300 parts by weight, especially 10 to 200 parts by weight, especially 20 to 150 parts by weight of plasticizer is used per 100 parts by weight of the transparent resin.
[0026]
In the present invention, the overlap adhesion treatment between the viewing side of the liquid crystal display panel and the transparent protective plate via the transparent resin sheet is performed by swelling the sheet between the transparent resin sheet and one or both of the liquid crystal display panel and the transparent protective plate. It is performed in a state where a volatile liquid having a viscosity of 10 cp or less that is not dissolved is provided. Specifically, for example, the surface of the transparent resin sheet is protected with a separator or the like on one of a liquid crystal display panel or a transparent protective plate, and is adhered with a roll laminator or the like, and then the separator or the like of the transparent resin sheet is peeled off to the surface. A volatile liquid is applied, and the liquid crystal display panel or the transparent protective plate is overlaid on the liquid crystal display panel or the transparent protective plate so as to be adhered by a pressure bonding method or the like.
[0027]
In the above, the volatile liquid can be provided either in the case of the adhesion treatment between the transparent resin sheet and the liquid crystal display panel or in the adhesion treatment between the transparent resin sheet and the transparent protective plate. As in the example, a volatile liquid can be disposed only between one of them to perform the close contact treatment. In the latter case, it is relatively easy to apply a flexible transparent resin sheet to a flat plate without air bubbles, so that one of the liquid crystal display panel and the transparent protective plate is subjected to an adhesive treatment, and then the other is adhered. It is preferable to adopt a system in which a volatile liquid is provided.
[0028]
For the deployment of the volatile liquid, for example, an appropriate method such as a dropping method, a spraying method, or a coating method can be adopted. Sex liquid may be deployed. As the volatile liquid, an appropriate one that can be expanded flatly during adhesion treatment to prevent the introduction of bubbles while developing a thin layer, and improve the adhesion between the transparent resin sheet and the liquid crystal display panel or transparent protective plate at the adhesion interface Can be used.
[0029]
The volatile liquid that can be preferably used is one having a surface tension higher than that of the transparent resin sheet from the standpoint of preventing air bubbles from being mixed due to flattening at the time of the adhesion treatment. Examples thereof include water, especially distilled water, ion exchange water, ultrapure water, or a water / alcohol mixture. Such a volatile liquid is more preferable than the point that it is difficult to change optical characteristics of a transparent resin sheet or the like. The alcohol is preferably a lower alcohol such as methanol or ethanol from the viewpoint of volatility.
[0030]
Superimposed contact body via a transparent resin sheet on the viewing side and a transparent protective plate of a liquid crystal display panel, under heating for the purpose of discharge, etc. of the improvement and volatile liquids adhesion, especially, less than the volatilization temperature of the volatile liquid a drying treatment by押加pressure by an appropriate method such as a press method and autoclave under warming blanking scheme.
[0031]
In the present invention, there is no particular limitation except that a transparent protective plate is disposed in close contact with the viewing side of the liquid crystal display panel as shown in FIG. 1, and a liquid crystal display device having an appropriate structure is appropriately selected. It can be formed by a manufacturing process such as an assembly sequence. Accordingly, an appropriate liquid crystal display panel or transparent protective plate may be used, and it is possible to conform to the conventional one.
[0032]
Incidentally, examples of the liquid crystal display panel include a handwritten input type in which polarizing plates are arranged on both sides or one side of a liquid crystal display cell, and an in-vehicle type used in a car navigation system. The driving method of the liquid crystal cell for controlling the liquid crystal is arbitrary. Examples of the transparent protective plate include those formed of a glass plate or various resin plates.
[0033]
In the above-mentioned liquid crystal display device for in-vehicle use, the adhesion treatment through the transparent resin sheet improves the visibility and peels and replaces the transparent protective plate, and avoids danger by preventing the scattering when the transparent protective plate is damaged. It functions effectively as a liquid crystal display panel failure prevention by shock relaxation.
[0034]
【Example】
Example 1
On the viewing side polarizing plate of a 2.5mm thick liquid crystal display panel (180mm x 250mm), peel off one separator from the 200µm thick transparent resin sheet, and press-fit it through a roll laminator, and then the remaining separator The ultrapure water is dropped on the surface of the transparent resin sheet, and a 1.1 mm thick transparent glass plate (180 mm x 250 mm) is placed on top of it and pressed. After adhering to the entire interface with the transparent glass plate in a thin layer state, the ultrapure water is dried by pressing and pressing at 5 kgf / cm ² in an environment of 50 ° C., and superposed adhering treatment is performed. Obtained.
[0035]
In the above, the transparent resin sheet was prepared by dissolving 97 parts by weight of butyl acrylate, 3 parts by weight of acrylic acid, and 0.4 parts by weight of azobisisobutyronitrile in 100 parts by weight of ethyl acetate and stirring at about 60 ° C. The acrylic polymer solution obtained by the reaction was mixed with 50 parts by weight of dioctyl phthalate and 3 parts by weight of an isocyanate-based crosslinking agent, applied onto a 25 μm thick polyester separator, and dried by heating. .
[0036]
Example 2
In a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer, an ultraviolet irradiation device and a stirring device, 99 parts by weight of 2-ethylhexyl acrylate, 1 part by weight of acrylic acid, 2,2-dimethoxy-2-phenylacetophenone (start) Agent) 0.1 part by weight of 100 parts by weight of an acrylic polymer / monomer mixture having a polymerization rate of 10% by weight obtained by polymerizing by ultraviolet irradiation, 70 parts by weight of dioctyl phthalate and trimethylpropane triacrylate (crosslinking agent) ) 0.1 parts by weight is mixed and applied onto a 25 μm thick polyester separator, and a 400 μm thick transparent film is obtained by photopolymerization by irradiating with 2000 mj / cm ² of ultraviolet light with a UV lamp in a nitrogen atmosphere. A liquid crystal display device was obtained according to Example 1 except that a resin sheet was used.
[0037]
Comparative Example 1
A liquid crystal display device was obtained in the same manner as in Example 1 except that the ultrapure water was not dropped and superimposed without being heated and pressurized.
[0038]
Comparative Example 2
A liquid crystal display device was obtained in the same manner as in Example 2 except that the ultrapure water was not dropped and superposed without being heated and pressurized.
[0039]
In the liquid crystal display devices obtained in Examples 1 and 2 above, no bubbles were observed between the liquid crystal display panel and the transparent protective plate, and good visibility was exhibited. However, in the liquid crystal display devices obtained in Comparative Examples 1 and 2, a large number of bubbles that can be perceived even by visual observation are mixed between the liquid crystal display panel and the transparent protective plate, and light is scattered, so that the visibility is remarkably inferior.
[0040]
In the liquid crystal display devices of Examples 1 and 2, the transmittance of the total light in the superposed body in which the viewing side glass plate and the transparent protective plate of the liquid crystal display panel are subjected to the close-contact treatment via the transparent resin sheet is 90% in any case. Met. Further, when an attempt was made to peel off the transparent protective plate from the liquid crystal display device, it could be easily peeled together with the transparent resin sheet from the interface of the liquid crystal display panel, and the adhesive strength (180 degree peel) based on JIS C 2107 was 20 gf in Example 1. / 20 mm, and 10 gf / 20 mm in Example 2.
[Brief description of the drawings]
FIG. 1 is a sectional view of an embodiment.
FIG. 2 is a cross-sectional view of a conventional example.
[Explanation of symbols]
1: Transparent protective plate 2: Transparent resin sheet 3: Liquid crystal display panel 4: Illumination system 5: Air layer

Claims (3)

A volatile liquid having a viscosity of 10 cp or less that does not swell or dissolve the transparent resin sheet and one or both of the liquid crystal display panel and the transparent protective plate through the transparent resin sheet made of a plasticizer-containing acrylic polymer. with the deployed state, after brought into close contact with the visible side and the transparent protective plate of a liquid crystal display panel, a method of manufacturing a liquid crystal display device which is characterized that you drying treatment warming押加pressure.   In claim 1, using a volatile liquid having a surface tension higher than that of the transparent resin sheet, the liquid is dropped on the transparent resin sheet, and the dripping liquid is flattened and expanded during the adhesion treatment between the liquid crystal display panel and the transparent protective plate. A manufacturing method for discharging air bubbles interposed between a liquid crystal display panel and a transparent protective plate. The manufacturing method according to claim 1 or 2, using a refractive index difference with respect to the liquid crystal display panel and the transparent protection plate and the adhesive strength is less than 0.2, respectively, the weakly adhesive sheet buffering or less 200 gf / 20 mm as the transparent resin sheet .

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