KR101724760B1 - Tape base material for assembling display device, and adhesive sheet for assembling display device and display module unit using the same - Google Patents

Abstract

The present invention provides a tape base for assembling a display device having excellent light-shielding properties and light reflectivity. The tape base material (A) for assembling a display device of the present invention is characterized in that the light-shielding layers 2 and 2 are laminated and integrated on both surfaces of the base film 1 and the light reflection layer The light shielding layer 2 and the light shielding layer 2 are formed through the base film 1 and the pinhole is formed in each light shielding layer 2 even when the pinhole is formed in the light shielding layer 2. [ The pinholes formed in the respective light shielding layers 2 are not likely to overlap each other and the two light shielding layers 2 and 2 can reliably block light.

Description

TECHNICAL FIELD [0001] The present invention relates to a tape substrate for assembling a display device, and a pressure-sensitive adhesive sheet and a display module unit for assembling a display device using the tape substrate,

The present invention relates to a tape base for assembling a display device, and a pressure-sensitive adhesive sheet and a display module unit for assembling a display device using the same.

2. Description of the Related Art In recent years, liquid crystal display devices have been widely used as display devices for electronic devices such as cellular phones and electronic notebooks. As a liquid crystal display device used in such a small electronic apparatus, a sidelight type backlight type liquid crystal display device is used.

The sidelight type backlight type liquid crystal display device is generally disposed in a backlight case made of a synthetic resin after an optical film such as a reflective sheet, a light guide plate, a diffusion sheet, a prism sheet, or the like is laminated, A liquid crystal display panel is laminated and integrated on a film through a tape base for assembling a display device, and a lamp reflector is provided on the side of the light guide plate, and a light source such as an LED (light emitting diode) is disposed.

In addition, the tape base for assembling a display device has a light shielding property for preventing the appearance of a liquid crystal display surface from being deteriorated due to the entry of light into the outer peripheral portion of the liquid crystal display panel, and a light from a light source is reflected to efficiently guide light to the liquid crystal display panel It is necessary to have both of the light reflectivity to be used.

As such a tape substrate for assembling a display device, there is disclosed an adhesive tape which is combined with (a) light reflectivity and light shielding property which is used by being adhered between an LCD panel of a LCD module and a backlight case, (b) (C) a light-reflective layer having a thickness of 10 to 30 占 퐉 and a white colorant having a tensile strength of 10.0 N / 10 mm or more; and a heat-sensitive adhesive layer provided on at least one surface of the support, And a total thickness of 20 to 100 mu m.

Further, it is described that the light-shielding layer of the adhesive tape is formed by applying black ink onto a biaxially stretched white resin film and drying it, and it is preferable to laminate two to four layers to prevent pinholes (paragraph number [0034]).

In order to laminate two or three light-shielding layers on a white resin film, a black ink is coated on a white resin film and dried. Then, a black ink is coated on the black ink film and dried.

However, even if a black ink is applied onto a white resin film by applying a black ink, after drying the black ink completely coated on the white resin film and then applying the black ink, the production efficiency is lowered, The next black ink is applied onto the coating film before the black ink already coated on the resin film is completely dried.

On the other hand, black ink contains inorganic particles such as silicon particles as an anti-blocking agent, and it is believed that the inorganic particles are responsible for pinholes in the light-shielding layer. As described above, when the next black ink is applied again before the black ink applied on the white resin film is completely dried, the inorganic particles contained in the black ink are overlapped, and a plurality of coat layers As a result, even when a plurality of light-shielding layers are laminated, pinholes are formed in a state in which the light-shielding layer is traversed in the thickness direction, so that sufficient light-shielding properties can not be ensured.

Therefore, as the number of times of application of the black ink over the white resin film increases, the possibility of occurrence of a problem of pinholes in the light-shielding layer is reduced. However, if the thickness of the light-shielding layer is increased, the thickness of the adhesive tape becomes thick, There is a problem in that the demand for thinning the thickness of the film is reduced.

In addition, when the colored pigment contained in the black ink forming the light-shielding layer has conductivity, the conductivity of the light-shielding layer sharply increases when the thickness of the light-shielding layer exceeds a certain thickness. As a result, And this current causes a malfunction of the control device of the display panel of the display device.

Japanese Patent Application Laid-Open No. 2004-156015

The present invention relates to a display device assembly tape substrate having excellent light shielding properties and light reflectivity and capable of reliably maintaining the display performance of a display panel without causing a malfunction of the control device of the display panel by the current flowing in the light shielding layer, And a pressure-sensitive adhesive sheet and a display module unit for assembling a display device using the tape base for assembling the display device.

The tape substrate for assembling a display device of the present invention is characterized in that a carbon black produced by a furnace method is contained as black coloring agent on both surfaces of a base film and a light shielding layer having a thickness of 1 to 5 탆 is laminated and integrated , And a light reflecting layer is laminated and integrated on one of the light shielding layers.

The display module unit according to the present invention comprises a backlight case on a frame on which an end portion for arranging a panel is formed on an inner peripheral surface and a pressure sensitive adhesive sheet for assembling a display device disposed on the end for panel arrangement, A light shielding layer having a thickness of 1 to 5 mu m containing carbon black which is laminated and integrated on both sides of the film and which is produced by the furnace method as a black coloring agent and a display including a light reflecting layer laminated and integrated on one of the light shielding layers A display panel disposed on the pressure sensitive adhesive sheet for assembling the display device; and a plurality of optical films arranged in a laminated state in the backlight case.

In the tape substrate for assembling a display device of the present invention, since the light-shielding layers are laminated and integrated on both surfaces of the base film and the light reflection layers are laminated and integrated on either light shielding layer, the light shielding layers are respectively formed through the base film And even if a pinhole is formed in each light shielding layer, since the pinhole is a very small diameter hole, there is almost no possibility that the pinholes formed in each light shielding layer are overlapped with each other and the two light shielding layers can reliably block light.

In addition, the light-shielding layer contains carbon black produced by a furnace method as a black coloring agent, that is, a furnace black. The light-shielding layer has excellent light shielding properties and can shield light entering the tape substrate for display device assembly more reliably have.

Furthermore, since the conductivity of the light-shielding layer is reduced by using the furnace black as the black colorant contained in the light-shielding layer, the thickness of the light-shielding layer is 1 to 5 mu m, It is possible to prevent a current from flowing in the semiconductor device. Therefore, it is possible to prevent malfunction of the control device of the display panel according to the current flowing through the light shielding layer.

1 is a longitudinal sectional view showing a tape substrate for assembling a display device of the present invention.
2 is a longitudinal sectional view showing a pressure-sensitive adhesive sheet for assembling a display device of the present invention.
3 is a longitudinal sectional view showing another example of a pressure-sensitive adhesive sheet for assembling a display device of the present invention.
4 is a longitudinal sectional view showing another example of a pressure-sensitive adhesive sheet for assembling a display device of the present invention.
5 is an exploded view of the display module unit of the present invention.
6 is an exploded perspective view showing the display module unit of the present invention.
7 is a schematic view showing a method for measuring conductivity of a light-shielding layer of a tape substrate for assembling a display device of the present invention.

An example of a tape base for assembling a display device of the present invention will be described with reference to the drawings. The tape base material (A) for assembling a display device of the present invention is characterized in that the light-shielding layers 2 and 2 are laminated and integrated on both surfaces of the base film 1 and the light reflection layer 3) are integrally laminated. The shape of the tape base material A for assembling the display device is not particularly limited, but the following description will be made by taking a case where the tape base material A is formed as a frame.

The synthetic resin constituting the base film (1) of the tape substrate (A) for assembling the display device is not particularly limited as long as it is conventionally used as a tape base, and examples thereof include a polyvinyl chloride film, a polypropylene film, A polyester film, a polycarbonate film, a polyimide film, a polystyrene film, and a cellophane. A polyester film and a polypropylene film are preferable, and a polyethylene terephthalate film is more preferable.

The thickness of the base film 1 is preferably 10 占 퐉 or less because the thickness of the tape base material for assembling a display device obtained when the base film 1 is thicker becomes thick. When the thickness of the base film (1) is thin, the strength of the tape base material for assembling the display device is lowered, and at the same time, wrinkles are generated in the tape base material for assembling the display device during use and the integration of the backlight case and the display panel becomes insufficient It is preferably 1 mu m or more, more preferably 3 mu m or more, and particularly preferably 4 mu m or more. The thickness of the base film 1 is determined by cutting the tape base material for assembling a display device at an arbitrary position in the thickness direction thereof and observing the cut surface with an electron microscope to determine the average value of the base film thicknesses at arbitrary five positions .

The base film (1) preferably does not contain a powdery colored pigment, and since the powdery colored pigment is not contained in such a manner, the base film can be made thinner. As a result, And thinning can be achieved. The above-mentioned powdery colored pigment is not particularly limited as long as it is powdery at room temperature and may be a white pigment such as titanium dioxide, barium sulfate, zinc white or white paper, or a white pigment such as carbon black, acetylene black, pine smoke, Black pigments, and various other pigment pigments.

Particularly, it is possible to carry out a stretching treatment at a high magnification without causing cracks in the base film, and to improve the thinning of the base film and the strength thereof, by not containing the powdery colored pigment in the base film (1) .

As shown in Fig. 1, a light-shielding layer 2 is laminated and integrated on both sides of the base film 1. The light shielding layer 2 is made of carbon black produced by the furnace method (hereinafter, referred to as "furnace black") as a black coloring agent in order to prevent light from being transmitted through the light- In some cases).

The light-shielding layer 2 contains carbon black produced by the furnace method as a black coloring agent, so that the light-shielding layer 2 can be provided with excellent light-shielding properties while suppressing the conductivity of the light-shielding layer 2, When used for integrating the display panel and the backlight case, it is possible to prevent the light leakage from the backlight case and prevent the malfunction of the control device of the display panel to reliably maintain the display performance of the display panel, And displayability can be achieved.

If the average particle diameter of the black colorant (furnace black) is small, the handling property in the production of the black ink may be insufficient. If it is large, the surface roughness of the light-shielding layer becomes large and integration with the adhesive layer may become insufficient. Mu m is preferable. The average particle diameter of the black colorant refers to the average diameter obtained by observation with an electron microscope.

In order to form the light-shielding layer 2, a black ink containing a furnace black as a black coloring agent may be coated on the base film 1 and dried to form the black coloring layer. At this time, it is preferable that the step of applying and drying the ink on the base film (1) is carried out a plurality of times. That is, the step of coating and drying the black ink may be repeated a plurality of times to form the light-shielding layer 2 by integrating a plurality of light-shielding layers in a laminated structure. Thus, even if a pinhole is formed in one light-shielding layer, the pinhole is very small in diameter so that the pinhole does not overlap with the pinhole formed in the other light-shielding layer, and the pinhole formed in the light- Can be reliably shielded by the other light shielding layer and the light shielding property of the light shielding layer 2 can be more surely secured. In order to apply the ink, general means such as gravure printing, flexographic printing, and offset printing can be used.

When the affinity between the base film and the black ink is low, that is, when the wettability (affinity) of the base film is low when the black ink is applied to both surfaces of the base film 1 as described above, The black ink is not uniformly applied on the base film 1 when the black ink is applied to the surface of the base film 1 and particularly when the black ink is not uniformly applied and the carbon black is present in the thinned portion of the black ink , The binder is not smoothly supplied to the periphery of the carbon black, and as a result, a fine portion in which the black ink is not partially applied occurs, and this fine portion is presumed to be a pinhole.

Therefore, in order to apply the black ink to the surface of the base film 1 as uniformly as possible, both surfaces of the base film 1 are subjected to corona discharge treatment in advance to improve the wettability of both surfaces of the base film 1 , It is preferable to form the light shielding layer 2 (light shielding layer) by applying black ink to both surfaces of the base film 1. [ The corona discharge treatment is preferably performed so that the surface tension of the base film 1 is 40 mN / m or more.

As the black ink containing the black coloring agent (furnace black), it is preferable to contain a black coloring agent (furnace black), a binder and a solvent. As the binder, there is no particular limitation, but those conventionally used for ink are used, and examples thereof include polyurethane resin, phenol resin, epoxy resin, urea melamine resin, and polymethyl methacrylate, and polyurethane Resins are preferred.

As the binder, it is preferable that the content of halogen elements such as chlorine, bromine, fluorine, and iodine is 50 ppm or less. This is because if a large amount of halogen element is contained in the binder, a gas due to the halogen element is generated during use of the display device, and this causes the display performance of the display device to deteriorate, or noxious gas This is because of concerns.

The amount of halogen atoms in the binder can be measured by emission spectroscopy. The emission spectroscopic analysis is a method of measuring a contained element by exciting an atom with a plasma light source to emit light, and spectroscopying the emission with a diffraction grating or the like to obtain a so-called atomic spectrum. A measurement device commercially available from Shimadzu Corporation under the trade name "PDA series" can be used.

The solvent is not particularly limited and may be appropriately selected depending on the kind of the binder.

The content of the black coloring agent (furnace black) in the black ink is preferably less than 12% by weight in the ink because the electric insulating property when used in a display device may be lowered.

The ink containing black coloring agent (furnace black) is commercially available, for example, from Dainippon Ink and Chemicals, Incorporated under the trade designation "UNIVIA A-300" from Teikoku Ink Seisakusho Co., Lt; / RTI >

It is preferable that the light-shielding layer has a L * value of 25 +/- 10 representing the lightness among the L * a * b * colorimeter standardized in JIS Z8729.

When the content of the black coloring agent (furnace black) in the light-shielding layer 2 is small, the light-shielding property of the light-shielding layer deteriorates. When the display panel and the backlight case are used to integrate the light, And the visibility of the display device may deteriorate. If it is large, the electric insulation property when used in the display device may be lowered, so that it is preferably 15 to 70% by weight.

If the thickness of the light-shielding layer 2 is large, the thickness of the tape base for assembling a display device becomes thick, and if the light-shielding layer contains a colored pigment having conductivity, the conductivity of the light- It causes malfunction. If the thickness of the light-shielding layer 2 is small, the light-shielding performance is deteriorated. Therefore, the thickness of the light-shielding layer 2 is limited to 1 to 5 mu m, preferably 2 to 4 mu m. The thickness of the light-shielding layer is measured by cutting the tape base material for assembling a display device at an arbitrary position in its thickness direction and observing the cut surface with an electron microscope to measure the thickness of the shielding layer 2 at arbitrary five positions do.

If the total thickness of the light-shielding layers 2 and 2 laminated and integrated on both surfaces of the base film 1 is small, the light shielding performance may be lowered. If the total thickness of the light shielding layers 2 and 2 is thicker, It is preferable to be 2 占 퐉 or more, more preferably 2 to 10 占 퐉, and still more preferably 4 to 8 占 퐉.

The pinholes formed in the light-shielding layer 2 in which the light-shielding layers 2 and 2 are laminated and integrated on both surfaces of the base film 1 and the light-shielding layer 2, which is laminated and integrated on one surface of the base film 1, Since the pinholes formed in the light-shielding layer 2 laminated and integrated on the other surface of the film 1 are very small in size, the possibility of superimposition is very low, so that the tape substrate A for assembling a display device is excellent Shielding property.

The light shielding layer 2 and the light shielding layer 2 are formed on the other light shielding layer 2 and the light shielding layer 2 is formed on the other light shielding layer 2, It is not necessary to increase the thickness of the light shielding layer 2 more than necessary in order to prevent the formation of pinholes. Therefore, the thickness of the tape substrate A for assembling the display device can be reduced, the thickness precision of the light shielding layers 2, 2 can be improved, and the thickness of the tape base material A The quality can be made uniform.

In addition, since the thickness of the light-shielding layer 2 can be made thinner, the conductivity of the light-shielding layer 2 can be prevented from rising by the conductive colored pigment even when the conductive coloring pigment is contained in the light- It is possible to prevent electricity from flowing to the layer 2. As a result, it is possible to reliably maintain the display performance of the display panel without causing the malfunction of the control device of the display panel by the current flowing through the light-shielding layer 2. [

The light shielding layer 2 is usually formed by applying black ink to the surface of the base film 1 and drying it as described above. However, when the black ink is applied to the surface of the base film 1, There is a case in which the black ink is partially splashed. In this portion, the application of the black ink on the base film becomes insufficient and pinholes are formed in the light-shielding layer. Therefore, it is conceivable to conceal the pinholes formed in the lower light-shielding layer by the light-shielding layer formed on the upper side by repeating the step of applying the black ink onto the base film and drying and forming the light-shielding layer a plurality of times. However, even when black ink is applied again to the part where the black ink splashes when forming the lower light-shielding layer, there is a high possibility that the black ink for forming the upper light-shielding layer is splashed, and pinholes are formed in the same part There is a high possibility that the pinhole can not be concealed.

On the other hand, in the tape base material (A) for assembling a display device of the present invention, since the light shielding layers 2 and 2 are formed on both surfaces of the base film 1, respectively, . Therefore, it is very unlikely that the black ink applied to both sides of the base film is flipped by the base film. Therefore, the pinhole formed on one light-shielding layer 2 and the pinhole formed on the other light-shielding layer 2 are rarely overlapped with each other, and the pinhole formed on one light-shielding layer 2 is not overlapped with the other light- 2 by means of a pinhole formed in the housing. Therefore, the tape substrate A for assembling the display device of the present invention has excellent light shielding properties.

The light-shielding layers (2) and (2) laminated and integrated on both surfaces of the base film (1) of the tape substrate (A) for assembling a display device of the present invention are not necessarily required to have the same structure, 2 may have different configurations.

The light reflection layer 3 is laminated and integrated on either the light-shielding layer 2 of the light-shielding layer 2 or 2 of the tape base material A for assembling a display device. When the tape base material A for assembling a display device has the light reflecting layer 3 and is used, for example, to integrate the display panel and the backlight case together, the light from the backlight case is directed in the direction of the reflection plate 10 So that light can be efficiently guided to the display panel.

The light reflection layer 3 may reflect light and preferably contains a white coloring agent. Examples of such a white colorant include, but are not limited to, titanium dioxide, barium sulfate, zinc oxide, and lead titanate. Titanium dioxide is preferred.

In order to form the light reflecting layer 3, an ink capable of forming the light reflecting layer 3 may be applied and dried on the light shielding layer 2, and a white ink containing a white coloring agent is preferably applied, dried . At this time, it is preferable that the step of applying and drying the ink is performed a plurality of times. Further, in order to apply the ink, general means such as gravure printing, flexo printing, offset printing and the like can be used.

The white ink containing the white colorant preferably contains a white colorant, a binder and a solvent. Since the binder and the solvent are the same as the black colorant, the description thereof will be omitted.

As the content of the white coloring agent in the white ink, the reflectance of the light reflection layer is lowered and the thickness of the light reflection layer can not be made thinner while maintaining a sufficient light reflectance. On the other hand, The adhesion between the light reflection layer and the pressure-sensitive adhesive layer is lowered, and there is a risk of causing delamination between the light reflection layer and the pressure-sensitive adhesive layer, so that the amount is preferably 10 to 40% by weight, more preferably 15 to 30% Do.

Examples of the white ink include a white ink commercially available from Dainippon Ink and Chemicals, Inc. under the trade name of "Panashia CVL-SP709", a white ink commercially available from Teikoku Ink Company under the trade name "EGS611 Shiro" Can be used.

If the content of the white colorant in the light reflection layer 3 is too small, the reflectance of the light reflection layer is lowered, and the thickness of the light reflection layer can be reduced while maintaining a sufficient light reflectance. When the pressure-sensitive adhesive layer is formed on the light reflection layer, the adhesion between the light reflection layer and the pressure-sensitive adhesive layer is lowered, and there is a risk of causing delamination between the light reflection layer and the pressure-sensitive adhesive layer.

It is preferable that the light reflection layer 3 has an L * value of 85 in terms of lightness among the L * a * b * color system standardized in JIS Z8729.

If the thickness of the light reflection layer 3 is thin, the light shielding layer can be seen through the light reflection layer, the color of the light reflection layer becomes apparently gray, and at the same time, light transmitted through the light reflection layer may be absorbed in the light shielding layer, The reflective performance of the reflective layer 3 may be deteriorated. If the thickness of the reflective layer 3 is too thick, the thickness of the entire tape substrate for assembling the display device becomes thick. The thickness of the light reflection layer 3 is obtained by cutting the tape base material for assembling a display device at an arbitrary point in its thickness direction and observing the cut surface with an electron microscope to measure the thickness of the light reflection layer 3 at any five points The average value is the average value.

As described above, the light-shielding layer 2 is laminated and integrated on both surfaces of the base film 1 and the light reflection layer 3 is provided on one of the light-shielding layers 2, As shown in Fig. 2 and Fig. 3, the pressure-sensitive adhesive layer 4 may be integrally laminated on at least one surface of the tape base material A for assembling a display device to form the pressure-sensitive adhesive sheet B for assembling a display device , Or the pressure-sensitive adhesive sheet (B) for assembling a display device may be formed by laminating and integrating the pressure-sensitive adhesive layers (4) and (4) on both sides of the tape base material A for assembling a display device as shown in Fig.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (4) is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive and a silicone pressure-sensitive adhesive. The pressure-sensitive adhesive layers 4 and 4 may be the same or different when the pressure-sensitive adhesive layers 4 and 4 are laminated and integrated on both sides of the tape substrate A for assembling the display device.

Examples of the acrylic adhesive include a homopolymer of a (meth) acrylic acid alkyl ester having 1 to 18 carbon atoms in the alkyl group, a copolymer of a copolymerizable monomer such as a (meth) acrylic acid alkyl ester having 1 to 18 carbon atoms in the alkyl group and other functional monomers And more preferably 50 wt% or more. In the present invention, (meth) acryl means acryl or methacryl.

The content of the (meth) acrylic acid alkyl ester component having 1 to 18 carbon atoms in the alkyl group in the acrylic pressure-sensitive adhesive is preferably 50% by weight or more, more preferably 60% by weight or more Is more preferable.

The (meth) acrylic acid alkyl ester is not particularly limited, and examples thereof include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, hexyl (Meth) acrylate, octyl acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl have.

Examples of the functional monomer include a monomer having a hydroxyl group, a monomer having a carboxyl group, a monomer having an amide group, and a monomer having an amino group. Examples of the monomer having a hydroxyl group include (meth) acrylic acid hydroxyalkyl such as 2-hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate.

Examples of the monomer having a carboxyl group include?,? - unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid; Maleic acid monoalkyl such as butyl maleate; Unsaturated dibasic acids such as maleic acid, fumaric acid and itaconic acid, and dibasic acid anhydrides such as maleic anhydride.

Examples of the monomer having an amide group include alkyl (meth) acrylamides such as (meth) acrylamide, dimethyl (meth) acrylamide and diethyl (meth) acrylamide, N-butoxymethyl N-alkoxymethyl (meth) acrylamide such as methoxymethyl (meth) acrylamide, diacetone (meth) acrylamide and the like.

Examples of the monomer having an amino group include dimethylaminoethyl (meth) acrylate and the like. Examples of the copolymerizable monomers other than the above include vinyl acetate, styrene,? -Methylstyrene, vinyl chloride, acrylonitrile, ethylene, propylene and the like.

In addition, a tackifier, a crosslinking agent and the like may be added to the acrylic pressure-sensitive adhesive, if necessary. Examples of such a tackifier include rosin resin, polyterpene resin, coumarone-indene resin, petroleum resin, terpene-phenol resin and the like. Examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, an oxazoline crosslinking agent, an aziridine crosslinking agent, and a metal chelating crosslinking agent.

As the acrylic pressure-sensitive adhesive, a (meth) acrylate-based resin having a weight average molecular weight of 500,000 to 1,000,000 measured as a polystyrene reduced molecular weight by the GPC method, a rosin ester-based resin having a hydroxyl value of 35 or more, A pressure-sensitive adhesive comprising a terpene phenol resin and having a gel fraction of 10 to 40% by weight is preferred. By using such a pressure-sensitive adhesive, it is preferable that the pressure-sensitive adhesive sheet for assembling a display device exhibits a sufficient adhesive force even if the thickness of the pressure-sensitive adhesive layer is reduced to about 10 탆.

Examples of the rubber adhesives include rubber elastic materials such as natural rubber, styrene-isoprene block copolymer, styrene-butadiene block copolymer, polyisoprene, polybutene, polyisobutylene, ethylene-vinyl acetate copolymer, Or more.

A suitable amount of a tackifier such as a rosin resin, a polyterpene resin, a coumarone-indene resin, a petroleum resin, a terpene-phenol resin or the like is added to the rubber elastomer in an appropriate amount, and if necessary, a liquid polybutene, a mineral oil, A softener such as isoprene, liquid polyacrylate or the like is further blended. As the silicone-based pressure-sensitive adhesive, polydimethylsiloxane and the like may be contained in an amount of 50% by weight or more.

In addition, various kinds of additives such as anti-aging agents such as butylhydroxytoluene may be added in an appropriate amount to the pressure-sensitive adhesive. The pressure-sensitive adhesive layer 4 is preferably transparent, but the pressure-sensitive adhesive layer 4 that is laminated and integrated on the light reflection layer 3 is white, and the pressure-sensitive adhesive layer 4, which is laminated and integrated on the light-shielding layer 2, It is possible.

The method for forming the pressure-sensitive adhesive layer 4 on one side or both sides of the tape substrate A for assembling the display device is not particularly limited, and a solution or dispersion containing the pressure-sensitive adhesive on the tape substrate A for assembling the display device A method in which a solution or dispersion containing a pressure-sensitive adhesive is directly applied and dried on the release-treated surface of the release film using the above-mentioned method, and then the release film is coated with the pressure-sensitive adhesive A method in which the layer is overlaid on the tape base material A for assembly of the display device in a state where the layer is opposed to the tape base material A for display device assembly and the pressure sensitive adhesive layer is transferred to the tape base material A for display device assembly, .

When the thickness of the pressure-sensitive adhesive layer 4 is too thin, the pressure-sensitive adhesive layer may be deteriorated in its tackiness. The thickness of the pressure-sensitive adhesive layer 4 is preferably 5 to 50 탆.

Next, a mode of use of the pressure-sensitive adhesive sheet (B) for assembling the display device will be described by taking the pressure-sensitive adhesive sheet (B) for assembling a display device shown in Fig. 4 as an example. The pressure-sensitive adhesive sheet B for assembling a display device is formed in a rectangular frame, and a display panel 6 such as a liquid crystal display panel or an organic EL (electroluminescence) panel is arranged and integrated in the backlight case 5, C).

5 and 6, the backlight case 5 is formed as a rectangular frame made of a synthetic resin, and the upper end of the backlight case 5 is provided with a panel positioning end portion 51 (see FIG. 5) on a flat rectangular frame for placing the display panel 6 thereon Is formed on the upper end surface of the backlight case 5 and the lower end of the flat rectangular frame 51 is provided with a reflection plate positioning end 52 for positioning the reflection plate 10, As shown in Fig.

A planar rectangular display panel 6 having a size slightly smaller than the upper opening of the backlight case 5 is disposed on the panel arrangement end portion 51 of the backlight case 5, A plurality of optical films are arranged in a laminated state in the optical film 5.

Specifically, the light guide plate 7, the diffusion sheet 8, and one or more prism sheets 9, 9 for improving the brightness are provided. The prism sheet 9 is placed opposite to the display panel 6 and the prism sheet 9 is placed on the panel receiving surface 51a of the panel- Is disposed in the case (5). In addition, optical films other than the above may be stacked appropriately.

The reflection plate 10 is arranged and integrated with the reflecting plate disposing end 52 of the backlight case 5 and an LED (not shown) is disposed as a light source in the backlight case 5.

The display panel 6 and the prism sheet 9 facing the display panel 6 are integrated through a pressure sensitive adhesive sheet B for assembling a display device and the pressure sensitive adhesive sheet B for assembling a display device has a light shielding layer 2 The light reflection layer 3 is disposed on the panel 6 so as to face the prism sheet 9. [

The adhesive sheet B for assembling a display device is placed on the panel receiving surface 51a of the panel arrangement end portion 51 of the backlight case 5, The width dimension to the extent of reaching the outer peripheral portion of the prism sheet 9 disposed in the opening surrounded by the panel receiving surface 51a of the panel positioning end portion 51 from the inner peripheral portion of the panel receiving surface 51a of the end portion 51 The panel receiving surface 51a and the prism sheet 9 of the panel arrangement end portion of the backlight case 5 and the display panel 6 are bonded to the entire periphery of the adhesive sheet for assembling display device B ).

In the above description, the optical film opposed to the display panel 6 is a prism sheet 9. However, the optical film opposed to the display panel 6 is not necessarily a prism sheet, but may be another optical film.

The display module unit C configured as described above can be suitably adapted to the thinness of small electronic apparatuses such as cellular phones and electronic dictionaries because the tape base material A for assembling display apparatuses is thinned, The tape base for assembling the display device is excellent in light shielding property for preventing the appearance of the display surface from deteriorating due to light entering the outer periphery of the display panel and excellent light for reflecting light from the light source and efficiently guiding light to the display panel And the display module unit obtained is not only thin but also has excellent display performance.

In addition, since the light-shielding layer 2 in the tape substrate A for assembling a display device of the pressure-sensitive adhesive sheet for assembling a display device B is thin and has very low conductivity, the control device of the display panel 6 is adversely affected And the display performance of the display panel 6 is not impaired.

[Example]

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Example 1)

A transparent colorless transparent polyethylene terephthalate film (trade name "5AF53 ", trade name, manufactured by Doraisha) having a thickness of 4.5 mu m was prepared as a transparent base film (1). Further, the polyethylene terephthalate film did not contain any color pigment. Corona discharge treatment was applied to both surfaces of the transparent base film 1, and the surface tension of both surfaces of the transparent base film 1 was 50 mN / m.

30 parts by weight of a urethane resin (halogen element content: less than 50 ppm) as a binder, 10 parts by weight of carbon black prepared by a furnace method having an average particle diameter of 0.03 탆 as a black colorant, and ethyl acetate, toluene and isopropyl alcohol And a black ink (carbon black: 10% by weight) composed of 60 parts by weight of a solvent was prepared.

Black ink was coated on one side of the polyethylene terephthalate film 1 by gravure printing and dried to form a light shielding layer having a thickness of 1 탆. The black ink was coated again on the light shielding layer by a gravure printing method and dried to obtain a light shielding layer having a separate thickness of 1 占 퐉 on the light shielding layer. The procedure of coating and drying the black ink on the light shielding layer was repeated three times in total to form the light shielding layer 2 having the light shielding layer of 4 layers and the thickness of 4 mu m which were laminated and integrated with each other. The content of carbon black in each light-shielding layer was 25% by weight.

Further, the light-shielding layer 2 having a thickness of 4 占 퐉, in which the light-shielding layer was laminated and integrated with each other, was formed on the other surface of the polyethylene terephthalate film 1 in the same manner. The content of carbon black in each light-shielding layer was 25% by weight.

Subsequently, 25 parts by weight of a urethane resin (halogen element content: less than 50 ppm) as a binder, 25 parts by weight of titanium dioxide as a white coloring agent, and 25 parts by weight of ethyl acetate as a binder were laminated on the light-shielding layer 2 laminated and integrated on one surface of the polyethylene terephthalate film , And 50 parts by weight of a solvent in which toluene and isopropyl alcohol were mixed was coated by a gravure printing method and dried to form a light reflecting layer having a thickness of 1.3 占 퐉.

Further, the white ink was coated again on the light reflection layer by gravure printing and dried, whereby a light reflection layer having a separate thickness of 1.3 占 퐉 was laminated and integrated on the light reflection layer. The procedure of coating and drying the white ink on the light reflecting layer was repeated twice in total to form a light reflecting layer 3 having a thickness of 3.9 mu m to form a tape base material A for assembling a display device. The content of titanium dioxide in each light reflecting layer was 50% by weight.

Then, an acrylic pressure-sensitive adhesive (trade name "SK1717", manufactured by Soken Chemical & Co., Ltd.) was applied and dried on the light-shielding layer 2 and the light reflecting layer 3 laminated and integrated on the other surface of the polyethylene terephthalate film 1, (4) and (4) each having a thickness of 20 占 퐉 were formed on the light reflection layer (2) and the light reflection layer (3), respectively, to produce the pressure sensitive adhesive sheet (B) for assembling the display device shown in Fig.

(Example 2)

Except that the light-shielding layer 2 having a thickness of 1 占 퐉 consisting of one light-shielding layer was formed on each of both sides of the polyethylene terephthalate film 1, To prepare a sheet (B).

(Example 3)

The light shielding layer formed by laminating and integrating the polyethylene terephthalate film 1 on one surface thereof was coated with black ink and dried. The light shielding layer was laminated in two layers to form a light shielding layer having a thickness of 2 占 퐉 Sensitive adhesive sheet (B) for assembling the display device shown in Fig. 4 was produced in the same manner as in Example 1, except that a layer was formed.

(Example 4)

A total of four times of applying a black ink onto the light shielding layer layered and integrated on both sides of the polyethylene terephthalate film 1 and drying the same in total for three times in total were repeated to form five light shielding layer layers, A pressure-sensitive adhesive sheet (B) for assembling the display device shown in Fig. 4 was produced in the same manner as in Example 1, except that the light-shielding layer was formed.

(Example 5)

The light shielding substrate layer laminated and integrated on both sides of the polyethylene terephthalate film 1 was coated with a black ink on the light shielding substrate layer and dried in total, instead of three times in total, so that the light shielding substrate layer was composed of two layers, A pressure-sensitive adhesive sheet (B) for assembling the display device shown in Fig. 4 was produced in the same manner as in Example 1, except that the light-shielding layer was formed.

(Comparative Example 1)

A light-shielding layer 2 having a light-shielding layer 2 having a light-shielding layer 8 formed on one side of the polyethylene terephthalate film 1 and having a laminated structure of 8 layers is formed, a light-shielding layer is formed on the other surface of the polyethylene terephthalate film 1 Except that a light reflecting layer 3 having a thickness of 3.9 μm formed by laminating three layers of a light reflecting layer directly on the other surface of the polyethylene terephthalate film 1 was formed in the same manner as in Example 1 To thereby produce a pressure-sensitive adhesive sheet (B) for assembling the device.

(Comparative Example 2)

The same black ink as that in Example 1 was prepared by preparing a white resin film (manufactured by Dejin Corporation, trade name "Teflex ", thickness: 13 탆, total light transmittance: 30 to 40%

Subsequently, a black ink was coated on one surface of the white resin film by gravure printing and dried to form a light shielding layer having a thickness of 1 탆. The black ink was coated again on the light shielding layer by gravure printing and dried to obtain a light shielding layer having a thickness of 1 占 퐉 on the light shielding layer. The procedure of coating and drying the black ink on the light shielding layer was repeated seven times in total to form a light shielding layer having a thickness of 8 占 퐉 in which the light shielding layer was formed into a laminated structure of eight layers.

Next, an acrylic pressure-sensitive adhesive was applied onto the other surface of the white resin film and the light-shielding layer and dried to form a pressure-sensitive adhesive layer having a thickness of 1.5 탆 to produce a pressure-sensitive adhesive sheet for assembling a display device.

(Comparative Example 3)

Except that the light-shielding layer 2 having a thickness of 0.5 탆 composed of one light-shielding layer was formed on each of both sides of the polyethylene terephthalate film 1, the adhesive for assembly of the display device shown in Fig. 4 To prepare a sheet (B).

(Comparative Example 4)

A total of five times of applying a black ink onto the light shielding layer formed on the other side of the polyethylene terephthalate film and drying the light shielding layer in total for five times in total to form a light shielding layer having a thickness of 6 占 퐉, , The pressure-sensitive adhesive sheet (B) for assembling the display device shown in Fig. 4 was produced in the same manner as in Example 1.

(Comparative Example 5)

The same black ink as that in Example 1 was prepared by preparing a white resin film (manufactured by Dejin Corporation, trade name "Teflex ", thickness: 13 탆, total light transmittance: 30 to 40%

Subsequently, a black ink was coated on one side of the white resin film by gravure printing and dried to form a light-shielding layer made of a light shielding layer having a thickness of 1 m. Thereafter, an acrylic pressure-sensitive adhesive (trade name "SK1717", manufactured by Soken Chemical & Co., Ltd.) was applied onto the other surface and the light-shielding layer of the white resin film and dried, To produce a pressure-sensitive adhesive sheet for assembling a display device.

(Comparative Example 6)

The same black ink as that in Example 1 was prepared by preparing a white resin film (manufactured by Dejin Corporation, trade name "Teflex ", thickness: 13 탆, total light transmittance: 30 to 40%

Subsequently, a black ink was coated on one surface of the white resin film by gravure printing and dried to form a light shielding layer having a thickness of 1 탆. The black ink was coated again on the light shielding layer by gravure printing and dried to obtain a light shielding layer having a thickness of 1 占 퐉 on the light shielding layer. The procedure of coating and drying the black ink on the light shielding layer was repeated five times in total to form a light shielding layer having a thickness of 6 mu m formed by laminating the light shielding layers 6 layers together to form a tape substrate for assembling a display device.

Then, an acrylic pressure-sensitive adhesive (trade name "SK1717", manufactured by Soken Chemical Co., Ltd.) was coated on the other surface and the light-shielding layer of the white resin film and dried to form a pressure-sensitive adhesive layer having a thickness of 20 μm on each of the other surface of the white resin film and the light- To prepare a pressure-sensitive adhesive sheet for assembling a display device.

(Comparative Example 7)

The procedure of coating and drying the black ink on the light shielding layer was repeated nine times in total instead of five times in total to obtain a light shielding layer having a thickness of 10 mu m, A pressure-sensitive adhesive sheet for assembling a display device was produced.

(Comparative Example 8)

A transparent resin film (trade name: "Tyco Polyester Film # 23 FE2002", thickness: 23 μm, total light transmittance: 85 to 95%, manufactured by Futamura Co., Ltd.) was prepared as a base film.

Then, an acrylic pressure-sensitive adhesive (trade name "SK1717", manufactured by Soken Chemical & Co., Ltd.) was applied to both sides of the transparent resin film and dried to form a pressure-sensitive adhesive layer having a thickness of 20 m on both sides of the transparent resin film, Sheet.

(Comparative Example 9)

A light shielding layer 2 having a thickness of 1 占 퐉 consisting of a light shielding layer of one layer formed on both sides of a polyethylene terephthalate film 1 and a Ketjen black black (Ketjen Black EC manufactured by Mitsubishi Chemical Corporation) were used as carbon black , The pressure-sensitive adhesive sheet (B) for assembling the display device shown in Fig. 4 was produced in the same manner as in Example 1.

(Comparative Example 10)

A light-shielding layer 2 having a thickness of 6 占 퐉 formed by laminating and integrating six layers of light-shielding layers on one surface of a polyethylene terephthalate film 1, a light-shielding layer formed on the other surface of the polyethylene terephthalate film 1 Except that a light reflecting layer 3 having a thickness of 3.9 μm formed by laminating three layers of a light reflecting layer directly on the other surface of the polyethylene terephthalate film 1 was formed in the same manner as in Example 1 To thereby produce a pressure-sensitive adhesive sheet (B) for assembling the device.

(Comparative Example 11)

A light-shielding layer 2 having a thickness of 10 mu m formed by laminating and integrating ten light-shielding layers on one surface of a polyethylene terephthalate film 1 is formed, a light-shielding layer is formed on the other surface of the polyethylene terephthalate film 1 Except that a light reflecting layer 3 having a thickness of 3.9 μm formed by laminating three layers of a light reflecting layer directly on the other surface of the polyethylene terephthalate film 1 was formed in the same manner as in Example 1 To thereby produce a pressure-sensitive adhesive sheet (B) for assembling the device.

The light reflectance, lightness, light shielding property, conductivity of the light shielding layer and the number of pinholes of the pressure sensitive adhesive sheet for assembling a display device obtained were measured in the following manner, and the results are shown in Table 1. The obtained adhesive sheet for assembling a display device was used to confirm whether or not the electronic apparatus was normally operated. The results are shown in Table 1.

(Light reflectance)

The total light reflectance of the light reflection layer of the pressure-sensitive adhesive sheet for assembling a display device was measured at 500 nm in accordance with JIS K7105. For Comparative Example 2, the light reflectance of the white resin film was measured.

(brightness)

With respect to the light reflection layer and the light shielding layer of the pressure-sensitive adhesive sheet for assembling a display device, L * representing brightness in the L * a * b * colorimetric system was measured according to JIS Z8729. In addition, the brightness of the white resin film was measured as the lightness of the light reflection layer in Comparative Example 2.

(Light shielding)

The total light transmittance of the light-shielding layer of the pressure-sensitive adhesive sheet for assembling a display device was measured according to JIS K7105.

(Conductivity of the light-shielding layer)

Three test pieces (T) of a flat square having a side length of 50 mm were cut from the tape base material for assembling the display device. Then, as shown in Fig. 7, two metal needles (N _1), with the (N ₂₎ distance (W ₁₎ of a 10 mm so as to be stuck to each other parallel to each test piece (T). The two needles N ₁ and N ₂ were made to penetrate from the other surface side to the other surface side of the test piece T and then penetrate from one surface side to the other surface side. The interval (W ₂ ) between the two points through which the needles N ₁ and N ₂ pass through the test piece T was 10 mm. The one surface or the other surface of the test piece corresponds to one surface or the other surface of the base film when the tape base material for assembling the display device is produced.

Then, contact Sikkim and at the same time, contacting the needle (S ₂₎ for measurement on the other needles (N ₂₎ measuring the resistance value of each test piece (T) one needle (N ₁₎ needle for measuring the (S ₁₎ And the average value of the resistance value of each test piece T was taken as the conductivity of the light shielding layer.

(Number of pin holes)

A tape base for assembling a display device was mounted on the top opening of the cylindrical body so as to completely cover the top opening. A light source (dichroic beam, 110 V, 65 W, beam angle 10 °, product number JDR110V65WKN / 5E11, manufactured by National Instruments) was placed in a cylindrical body to irradiate light from the light source onto the tape substrate for display device assembly. The number of pinholes was measured by visually observing the tape base material for assembling the display device from a position 30 cm vertically above. The distance in the vertical direction from the light source to the lower surface of the tape substrate for assembling the display device was set to 20 cm. In the tape base materials for assembling display devices of Comparative Examples 3 and 5, the presence of pinholes could not be confirmed because light was transmitted all over the screen.

The tape substrate for assembling the display device of Comparative Example 3 did not measure the presence or absence of pinholes because light was entirely transmitted.

(Operation of electronic device)

When a CPU (central processing unit) of a commercially available personal computer is mounted on the motherboard, the conduction terminal of the CPU is passed through the tape substrate for assembling the display device and then mounted on the mother board. In addition, the personal computer was activated to confirm whether or not it normally started. When the tape base material for assembling the display device is conductive, the personal computer does not normally start. The case where the engine was normally started was determined as "good", and the case where the engine was not normally started was defined as "bad".

An object of the present invention is to provide a liquid crystal display panel and organic electroluminescent display panel which have excellent light shielding properties and light reflectivity and can reliably maintain the display performance of the display panel without causing a malfunction of the control device of the display panel by the current flowing through the light shielding layer, A display module unit using a display panel such as an EL (electroluminescence) panel, and the like.

1: substrate film
2: Shading layer
3: light reflection layer
4: Pressure-sensitive adhesive layer
5: Backlight Case
6: Display panel
A: tape substrate for assembly of display device
B: Pressure-sensitive adhesive sheet for assembling display device
C: Display module unit

Claims (6)

A light shielding layer having a thickness of 1 to 5 占 퐉 which is laminated and integrated on both surfaces of the substrate film and contains furnace black as a black coloring agent but does not contain inorganic particles as an antiblocking agent; Wherein the total thickness of the light-shielding layer laminated and integrated on both surfaces of the base film is 2 to 10 mu m, wherein the light-reflecting layer is laminated and integrated on the light-shielding layer. The tape substrate for assembling a display device according to claim 1, wherein corona discharge treatment is applied to both surfaces of the base film. A pressure-sensitive adhesive sheet for assembling a display device, wherein a pressure-sensitive adhesive layer is laminated and integrated on at least one surface of a tape substrate for assembling a display device according to claim 1 or 2. 4. The pressure-sensitive adhesive sheet for assembling a display device according to claim 3, wherein the base film does not contain a powdery colored pigment and has a thickness of 1 to 10 mu m. A backlight case on a frame on which an end for panel disposition is formed on an inner peripheral surface, and a pressure sensitive adhesive sheet for assembling a display device disposed on the end for panel disposition, comprising: a base film laminated and integrated on both sides of the base film, A light-shielding layer having a thickness of 1 to 5 占 퐉 and containing a furnace black as an anti-blocking agent but not containing an inorganic particle; and a light reflecting layer laminated and integrated on one of the light-shielding layers, A pressure-sensitive adhesive sheet for assembling a display device comprising a tape substrate for assembling a display device having a total thickness of the light-shielding layer integrated at 2 to 10 탆 and a pressure-sensitive adhesive layer laminated and integrated on at least one surface of the tape substrate for assembling the display device; A display panel disposed on the pressure sensitive adhesive sheet for assembling a display device; Display module unit comprising a plurality of optical film sheets. 6. The display module unit according to claim 5, wherein the base film does not contain a powdery colored pigment and has a thickness of 1 to 10 mu m.

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