JP3147000U - Display - Google Patents

Abstract

A light-diffusing film (optical film) and a pressure-sensitive adhesive layer are cut (punched) into substantially the same characters, figures, patterns, etc., and these are bonded to a light guide plate, thereby bonding them together As a result, a large amount of light is emitted, and only the characters and the like can be displayed brighter, and the light can be emitted efficiently by bonding through an adhesive layer, and further energy saving. Provide a display that can also contribute.
A display display 1 in which a light guide plate 2 and a light diffusing film 4 are attached via an adhesive layer 3, wherein the light diffusing film and the adhesive layer have the same shape in plan view. A display characterized by being.
[Selection] Figure 1

Description

  The present invention relates to a display display in which a light guide plate and a light diffusing film are bonded via an adhesive layer.

  In recent years, many displays for providing information have been seen in public places. For example, a liquid crystal display installed in a train can see moving images and still images. In addition, large displays for advertisements and promotions installed at airport and station platforms, displays for street corner products and stores, events at supermarkets and department stores, large displays for guiding products, etc. Opportunities to see numerous displays are increasing.

  By using these displays (media) to clearly indicate the company name, store name, product name, logo mark, etc., it is possible to provide information and at the same time strongly impress consumers with the image of the company name, store name, product name, etc. And is expected to facilitate differentiation from other companies.

  As the light source used for the display, various things such as a fluorescent lamp, LED, organic EL, etc. can be mentioned. In order to make the display itself as thin as possible, a light source is installed on the side, and a light guide plate is used. A structure that emits light widely and uniformly to the front and back is often used. In addition, a display having the same configuration as a liquid crystal monitor or a liquid crystal television in which a light diffusing plate or the like is installed on a light guide plate and a liquid crystal panel is installed to clearly show a moving image or a still image is used.

  There is also a display called electronic paper that uses LEDs and a light guide plate to emit light uniformly and change and display fixed information later.

  In addition, there are displays that can provide information such as simple advertisements and advertisements by simply installing various information transmission panels on a light guide plate having a light source.

  By the way, in order to emit light from the side only to the front surface, the light guide plate is devised so that light is emitted from the front surface as much as possible by providing a reflection plate on the back surface. However, there are various materials for the light guide plate, such as a commonly used acrylic plate (refractive index 1.49), polycarbonate plate (refractive index 1.55), glass (refractive index 1.50 to 1.58). Since both of them have a refractive index of air larger than 1.0, the light emitted at a shallow angle with respect to the interface exiting the air is reflected and is not emitted to the surface. It is said that 30-40% of such light is present and the light is converted as heat. If such light loss can be eliminated and used efficiently, it is expected that light can be extracted without increasing the current, heat divergence is reduced, and energy saving is expected.

  In addition, commercially available liquid crystal monitors and the like are simply mounted on the light guide plate with a diffusion plate that makes light emitted from the light guide plate integrated with the light source uniform (for example, patents). Reference 1 and 2). Since there is an air layer between the light guide plate and the diffusion plate, loss of light occurs. In order to reduce this loss, methods such as surface treatment of the light guide plate itself to have a diffusion function and methods that do not create an air layer by using matching oil or the like between the light guide plate and the diffusion plate are being studied. However, it has been confirmed that the former causes problems such as a large increase in the number of processes and changes in product size, and the latter causes problems such as leakage of matching oil due to the heat of the light source.

JP 2006-179494 A Japanese Patent Laid-Open No. 11-288614

  Therefore, in order to address the above-mentioned problems, the present invention cuts (punches) the light diffusing film (optical film) and the adhesive layer so that the shape in plan view is the same, and affixes them to the light guide plate. By combining, a large amount of light is emitted only from the bonded part, and only the shape in plan view (for example, the shape of characters, figures, patterns, etc.) can be displayed brighter, and the adhesive layer is interposed. It is an object of the present invention to provide a display that can emit light efficiently and can contribute to energy saving.

  As a result of intensive studies to achieve the above object, the present inventors have found that the above object can be achieved by using the following display, and have completed the present invention.

  That is, the display of the present invention is a display in which a light guide plate and a light diffusing film are bonded via an adhesive layer, and the planar view shape of the light diffusing film and the adhesive layer is It is characterized by being identical.

  The light diffusing film (optical film) and the pressure-sensitive adhesive layer have the same shape in plan view, i.e., cut (punched) into substantially the same letters, figures, patterns, etc., and affix them to the light guide plate. A lot of light is emitted only from the pasted portion, and only the characters and the like can be displayed brighter. For example, if characters such as company name, store name, product name, logo mark, etc. can be clearly stated, the company name, store name, product name, logo mark, etc. will be brightened at the same time as the information on the display, giving consumers a strong image It becomes easy to differentiate from other companies and other products. Further, light energy that has been converted into heat and consumed can be used effectively, and characters and the like can be displayed brightly without increasing energy costs. Furthermore, when the character or the like is no longer necessary or when it is desired to change the character or the like, the light diffusing film and the adhesive layer (light diffusing film with the adhesive layer) are easily peeled off, and another adhesive layer There is also an advantage that the content of characters and the like can be easily changed by laminating the light diffusion film. In addition, the planar view shape is not the one obtained by observing a display display that forms a planar shape from a cross-section or a side surface in a state where a light diffusing film is bonded to a light guide plate via an adhesive layer. It means the shape observed from Also, the same may be completely the same or substantially the same.

  In the display according to the present invention, the light diffusing film is at least one selected from the group consisting of a diffusing plate containing light diffusing particles, a diffusing plate whose surface has been subjected to unevenness processing, a prism sheet, and a microlens. Preferably it is a seed. If the exit surface is a diffuser plate, prism sheet, or microlens, the angle changes, a lot of light is emitted, the brightness is improved, and when the shape in plan view is a character or a figure, the character It is effective because it is possible to make the shape of the surface bright and clear.

  In the display of the present invention, the pressure-sensitive adhesive layer preferably has a refractive index higher than the refractive index of the light guide plate. Furthermore, the pressure-sensitive adhesive exhibits light diffusibility by dispersing and containing light-transmitting non-colored particles. More preferably, it is a layer. If the surface of the light diffusing film is not smooth by using a diffusing plate containing the light diffusing particles, a diffusing plate whose surface has been subjected to unevenness processing, a prism sheet, a microlens, or the like, Even if the surface of the light diffusing film is smooth without using a diffusing plate or the like, the pressure-sensitive adhesive layer uses a material having a refractive index higher than the refractive index of the light guide plate, or light in the pressure-sensitive adhesive layer. When the light-transmitting non-colored particles having a diffusing function that changes the angle are dispersed and contained, a large amount of light can be emitted, the brightness can be improved, and the planar view shape is a character or a figure In addition, the shape of the characters and the like can be highlighted brightly and effectively.

  As described above, the display of the present invention has the same planar view shape of the light diffusive film and the pressure-sensitive adhesive layer. The light is emitted in the form of a figure, a figure, a pattern, etc., and only the letters, figures, etc. can be displayed brighter. Moreover, by bonding through the pressure-sensitive adhesive layer, light can be emitted efficiently, which can contribute to energy saving. Furthermore, the brightness can be improved by using a specific light diffusing film, and the pressure-sensitive adhesive layer has a refractive index higher than the refractive index of the light guide plate, or has no light transmittance. By using a pressure-sensitive adhesive layer that contains colored particles in a dispersed manner and exhibits light diffusibility, it is possible to provide an excellent effect of providing a display with improved luminance.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the display (1) of the present invention comprises a light guide plate (2) from which light is emitted, a light diffusing film (4), and an adhesive layer (3). It is characterized by being joined via.

  Examples of the light guide plate include an acrylic plate, a polycarbonate plate, and a glass plate, and examples include a reflector provided on a lower part or a side surface. Among them, a unit in which a light source and a light guide are integrated. It is preferable.

  Examples of the light source include a PDP phosphor, an LED phosphor, an organic EL, a cold cathode tube, a laser light source, and the like.

  Although it does not specifically limit as a light diffusable film used for this invention, if it is transparent, it can be used, for example, an acrylic resin, a polyester resin, an epoxy resin, a polystyrene resin, a polycarbonate resin, a urethane resin, styrene -An acrylonitrile copolymer, a styrene-methyl methacrylate copolymer, etc. are mention | raise | lifted.

  In particular, it is preferable that the refractive index of the light guide plate surface from which light is emitted <the refractive index of the pressure-sensitive adhesive layer <the refractive index of the light diffusing film, in order of light loss between layers. is there. For example, the polymethylmethacrylate light guide plate from which light is emitted has a surface refractive index of 1.49, an acrylic adhesive has a refractive index of 1.49 or more, and a light-diffusing film has a refractive index of 1.50 or more. A configuration or the like is preferably used.

  The light diffusing film used in the present invention is at least one selected from the group consisting of a diffusing plate containing light diffusing particles, a diffusing plate whose surface has been subjected to unevenness processing, a prism sheet, and a microlens. It is preferable that there is a micro lens. When the exit surface is the diffuser plate or the micro lens, the angle changes, a lot of light is emitted, the brightness is improved, and when the planar view shape is a character or a figure, the character etc. The shape can be brightly and clearly raised, which is effective.

  As the diffusing plate containing the light diffusing particles, a polymer solution in which the light diffusing particles are dispersed is applied with a dry thickness smaller than the particle size of the light diffusing particles, thereby creating a diffusing plate or polymer having a concavo-convex shape on the surface. A diffusion plate having a light diffusing function on the surface by kneading fine particles into the melt and extrusion molding can also be used.

  Examples of the microlens include those having a surface that has been subjected to uniform bullet-like or spherical processing of 1 to 100 μm, and examples of the prism sheet include those that have been subjected to pyramidal processing. Since such microlenses and prism sheets have a uniform structure, uniform light can be emitted to the air layer.

  The manufacturing method of the micro lens or prism sheet is not particularly limited, and is a method of performing surface molding by pressing a uniform sheet with a mold or the like, or molding by applying a liquid resin and curing it with UV or heat. It is also possible.

  Moreover, as the diffusing plate subjected to the uneven processing, various optical films that are heat-processed by an embossing roll or the like can be used. Moreover, it is more preferable to use the diffusion plate which has given the uneven | corrugated processing to the opposite surface of an adhesive layer. By performing such uneven processing, the surface area can be increased, and finally light can be efficiently emitted to the air layer.

  Although it does not specifically limit as an adhesive which forms the adhesive layer used for this invention, An acrylic adhesive and a rubber-type adhesive can be especially used without a restriction | limiting. By providing the light diffusive film on the light guide plate through the adhesive layer, light loss can be reduced and light can be emitted efficiently, leading to energy saving and effective.

  Further, as the pressure-sensitive adhesive composition (pressure-sensitive adhesive layer), it is preferable to use a pressure-sensitive adhesive that can obtain a refractive index higher than that of the light guide plate. It is more preferable to use a pressure-sensitive adhesive layer. Use of the pressure-sensitive adhesive layer is preferable because light can be emitted efficiently even if the surface of the light diffusing film is smooth.

  Examples of the light-transmitting non-colored particles include inorganic particles that may be conductive, such as silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide, and various crosslinked or uncrosslinked particles. Examples thereof include organic particles composed of polymers and the like.

  The pressure-sensitive adhesive composition may contain other known additives such as a crosslinking agent, a vulcanizing agent, a tackifier, a coloring agent, a powder such as a pigment, a dye, a surfactant, Plasticizer, surface lubricant, leveling agent, softener, antioxidant, anti-aging agent, light stabilizer, UV absorber, polymerization inhibitor, reducing agent, inorganic or organic filler, metal powder, particulate, foil It can be added as appropriate depending on the intended use of the product.

  The method for producing the pressure-sensitive adhesive layer is not particularly limited as long as it is a commonly used method.For example, it is applied to a release-treated support and dried to various optical films and sheets (such as a light diffusing film). It can be obtained by transcription.

  Hereinafter, examples specifically showing the configuration and effects of the present invention will be described. In addition, this invention is not limited to a following example.

[Example 1]
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, and a stirrer, 233 parts by weight of ethyl acetate as a solvent, 98 parts by weight of butyl acrylate, 1.0 part by weight of acrylic acid, 4-hydroxybutyl acrylate 1 0.0 part by weight and 0.1 part by weight of 2,2′-azobisisobutyronitrile were added, and after nitrogen substitution, the temperature was raised to 55 ° C. and a polymerization reaction was carried out for 15 hours. A solution of a (meth) acrylic polymer having a weight average molecular weight of 970,000 was obtained. The refractive index of this (meth) acrylic polymer was 1.46.

  A styrene oligomer (softening point: 72-77 ° C., weight average molecular weight: 1350, refractive index: 1.59, manufactured by Eastman Chemical Co., Ltd.) as a tackifier for 100 parts by weight of the solid content of the (meth) acrylic polymer. 40 parts by weight of Picolastic A75), 0.1 part by weight of isocyanurate trimer of hexamethylene diisocyanate (manufactured by Mitsui Chemicals Polyurethanes, Takenate D-170N), 3-glycidoxypropyltrimethoxysilane 1 weight part was added and it was set as the adhesive composition of this invention.

  The pressure-sensitive adhesive composition was applied on 38 μm PET subjected to silicone release treatment so that the dry thickness of the pressure-sensitive adhesive was 15 μm, dried and crosslinked at 120 ° C. for 3 minutes, and the (meth) acrylic polymer An adhesive layer having a gel fraction of 69% by weight and a refractive index of 1.50 was obtained.

  In addition, 20 parts by weight of a polystyrene resin (manufactured by PS Japan, HH105) was dissolved in 100 parts by weight of toluene to prepare a polystyrene solution. Next, the above polystyrene solution was applied to the surface of a 24 μm polyester (manufactured by Teijin DuPont, PET film G2, refractive index: 1.50), and a polystyrene layer (refractive index: 1.59, thickness after curing: 5 μm). And a microlens (f-number: 0.86) processed to a radius of 5 μm by hot pressing at 160 ° C. was obtained. Then, the said adhesive layer was transcribe | transferred to the polyester film side, and the light diffusable film with an adhesive layer was obtained.

  The light diffusing film with the pressure-sensitive adhesive layer is cut (punched) into a desired shape, and this is cut into a light guide plate (manufactured by Samsung Electronics Co., Ltd., 17-inch color display (SyncMaster 712N)). : 1.49)) affixed on top and used as a display.

  The display manufactured according to Example 1 emits light from the light source through the light guide plate, and further, the light is efficiently obtained by bonding the light guide plate and the light diffusing film through the adhesive layer. It is confirmed that the desired letters and figures are bright and clearly appear, and the brightness can be improved by efficiently saving energy by using them efficiently and emitting light efficiently on the display surface. did it.

It is sectional drawing which shows the one aspect | mode of the display of this invention. It is a top view which shows the one aspect | mode of the display of this invention.

Explanation of symbols

1: Display 2: Light guide plate 3: Adhesive layer 4: Light diffusive film

Claims (4)

A display device in which a light guide plate and a light diffusing film are attached via an adhesive layer,
The display according to claim 1, wherein the light diffusing film and the pressure-sensitive adhesive layer have the same shape in plan view.   The light diffusing film is at least one selected from the group consisting of a diffusing plate containing light diffusing particles, a diffusing plate whose surface has been subjected to unevenness processing, a prism sheet, and a microlens. The display according to claim 1.   The display according to claim 1, wherein the pressure-sensitive adhesive layer has a refractive index higher than that of the light guide plate.   The display according to claim 1, wherein the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer that contains light-transmitting non-colored particles in a dispersed manner and exhibits light diffusibility.

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