JP5039826B2 - Structure for improving image visibility of electronic device and electronic device having the structure - Google Patents

Description

The present invention relates to an electronic equipment having a visibility improving structures and structures of the electronic device image, and more particularly, a mobile phone, a personal digital assistant (PDA), electronic devices such as portable game machine structure to improve the visibility of the images and those concerning the electronic equipment having the structure.

In recent years, as seen in mobile phones, personal digital assistants (PDAs), portable game machines, notebook personal computers, copiers, fax machines, and the like, electronic devices having an image display unit have become widespread. In addition, with the spread of the Internet and high-speed communication networks, the image itself displayed on the image display unit has become more realistic. Under such circumstances, attention has been paid to improving the visibility of images of electronic devices. A typical example of the image display unit provided with these electronic devices is a liquid crystal display device. Visibility of the liquid crystal display is, by the progress of the liquid crystal display示技surgery, at present has been improved year by year.

  An electronic device having an image display unit should be opposed to the screen so that the image display device can be incorporated into the electronic device body as a component and the screen of the image display unit can be viewed for reasons of design and assembly of the electronic device body. There is a transparent panel made of plastics or glass. The transparent panel usually constitutes a part of the exterior (cover) of the main body of the electronic device and the exterior (cover) of the image display unit.

  As a result of intensive studies by the present inventors, it has been found that the visibility of an image is affected by the structure inside the electronic device body, that is, the structure of the portion where the image display device is incorporated in the electronic device body. For example, FIG. 1 is a cross-sectional view of an electronic device (portable game machine) having a reflective liquid crystal display unit 9, and an air layer 15 exists between the transparent panel 1 and the reflective liquid crystal display unit 9. The reflective liquid crystal display unit 9 further includes a protective panel 16, polarizing filters 17 and 22, glass plates 18 and 21, a color filter 19, a liquid crystal layer 20, and a reflective plate 23. The reflective liquid crystal display unit 9 reflects the external light 12 by the reflection plate 23 of the liquid crystal display unit 9 and transmits the reflected light to the color filter 19 to display the color on the principle. The person sees the transmitted light 13 transmitted through the color filter.

  However, for example, when the air layer 15 exists between the liquid crystal display unit 9 and the transparent panel 1, the external light 12 is reflected on the front and back surfaces of the transparent panel 1, and the protection provided on the liquid crystal display unit 9. Reflected by the panel 16 or the like. It is also conceivable that the reflected light 14 and the transmitted light 13 are further reflected on the back surface of the transparent panel 1. When the intensity of the reflected light 14 is strong, the surrounding scenery may be reflected, or the image may become whitish, which may reduce the visibility of the image. This is because when the intensity of the reflected light 14 is high, the intensity of the transmitted light 13 is weakened, so that the contrast of the image is lowered, and the weakened transmitted light 13 and the reflected light 14 are mixed, so that it is further visually recognized. It is thought that the nature decreases.

The present invention has been made in view of the above circumstances, and a structure for improving the visibility of an image of an electronic device by reducing reflected light at an interface such as the surface of a transparent panel that reduces the visibility, and the structure and to provide an electronic equipment having a.

One aspect of the present invention is a refractive index of 1.49 to 1.59 disposed so as to face a screen of an image display unit that constitutes a part of an image display unit cover of an electronic device so that the screen of the image display unit can be visually recognized. the outer surface of the transparent panel, the refractive index 1.2 to 1.6, a 70 hereinafter JIS a hardness, surface roughness (Ra) is made of transparency gels or transparent rubber having the following bonding surfaces 10μm a transparent member, so as to enable to freely remove it and bonding it, by adsorbing, it is possible to reduce the reflected light at the interface of the transparent panel, thereby improving the visibility of the image.

  Further, the surface of the image display unit has a structure in which another transparent member is in close contact between the surface of the image display unit of the electronic device and the back surface of the transparent panel constituting a part of the image display unit cover of the electronic device. And reflected light at both interfaces between the transparent panel and the back surface of the transparent panel can be suppressed.

As the transparent member, it is preferable to select a material having a refractive index close to the refractive index of the material of the transparent panel or the surface base material of the image display unit. is there. This is because the light reflected at the interface of the transparent panel can be reduced by bringing materials having similar refractive indexes into close contact with each other. Further, as the transparent member, the Young's modulus using an elastic body 10~800N / cm ^2, the visible light transmittance in a wavelength region of 380~780nm there is that you use of not less than 85% preferable. It is also preferable to absorb an external impact by using such an elastic body as the transparent member.

Moreover, as the pre-Symbol yet another transparency member, by using a sheet-like transparent member having a distance (d) greater thickness than (D) to the back surface of the transparent panel from the surface of the image display unit, the sheet-like transparent member It is also preferable to press the pressure between the surface of the image display unit and the back surface of the transparent panel. Moreover, it is preferable to form an oil film between the surface of the image display unit and the transparent panel. If an oil film is formed on the surface of the transparent member, bubbles can be prevented from being generated at the interface when the transparent member is placed on the image display unit or when the transparent panel is attached to the transparent member. It is.

As the transparent member, it is preferable to use a transparency gel or the surface of the transparent rubber is oil bleeding. Clear gel or clear rubber is flexible, Ru excellent adhesion to the surface and a transparent panel of the image display unit.

  The transparent member is a transparent gel or transparent rubber. A curable liquid gel or rubber composition is placed on the surface of the image display unit of the electronic device, and the back surface of the transparent panel constituting a part of the image display unit cover of the electronic device is transparent so that the liquid gel or the rubber composition is wetted. A panel is attached to the electronic device main body, a transparent gel or a transparent rubber is generated by curing the liquid gel or rubber composition, and the transparent gel or the transparent rubber is brought into close contact between the surface of the image display unit and the back surface of the transparent panel. May be. Further, the transparent member is a transparent gel or a transparent rubber, and after the curable liquid gel or the rubber composition is placed on the back surface of the transparent panel constituting a part of the image display unit cover of the electronic device, this is cured. To obtain a transparent panel to which a transparent gel or transparent rubber is adhered (or adhered), attach the transparent panel to the electronic device body, and place the transparent gel or transparent rubber on the surface of the image display unit of the electronic device. It may be adhered. This is because curing the curable liquid gel or rubber composition to produce a transparent gel or transparent rubber can provide the same effects as using a transparent gel or transparent rubber that has already been produced.

  The transparent gel is silicone gel, polyethylene gel, acrylic gel, urethane gel, butadiene gel, isoprene gel, butyl gel, styrene butadiene gel, ethylene vinyl acetate copolymer gel, ethylene-propylene-diene terpolymer gel, fluorine It is preferably at least one transparent gel selected from the group consisting of gels. The transparent rubber is made of silicone rubber, urethane rubber, acrylic rubber, butadiene rubber, isoprene rubber, butyl rubber, styrene butadiene rubber, ethylene vinyl acetate copolymer rubber, ethylene-propylene-diene terpolymer rubber, and fluoro rubber. It is preferably at least one transparent rubber selected from the group. Furthermore, the transparent member is preferably a transparent silicone gel or a transparent silicone rubber. Preferably, the transparent gel has a JIS-A hardness of less than 10, and the transparent rubber has a JIS-A hardness of 10 or more.

The transparent member, back side transparent member surface and / or the transparent panel images display unit may be removably adhered. The transparent panel may be a member that is integral with or removable from the image display unit cover of the electronic device.

  The attachment means between the image display unit cover of the electronic device and the electronic device main body is a screw tightening mechanism, and the transparent member is brought into close contact with the front surface of the image display unit and the back surface of the transparent panel by adjusting the screw tightening pressure. It is preferable that between the image display unit and the transparent panel, a crushing margin is provided in a peripheral portion of the transparent member. The surface of the transparent panel is preferably further subjected to antireflection processing.

  The image display unit is preferably one image display unit selected from the group consisting of a liquid crystal display device, a plasma display device, an organic electroluminescence display device, a cathode ray tube display device, or a field emission display device, more preferably. A reflective liquid crystal display device.

Another aspect of the present invention is an electronic device having the above-described vision認性improved structure. The electronic device is preferably a portable electronic device selected from the group consisting of a mobile phone, a portable game machine, a portable information terminal, a portable electronic dictionary, a portable television, and a portable DVD.

  According to the present invention, by attaching a transparent member to the transparent panel, it is possible to reduce reflected light generated at the interface of the transparent panel, improve the visibility of the image of the electronic device, and have various image display units. It can be applied to electronic equipment. Moreover, the visibility of an image can further be improved by sticking a transparent member to both surfaces of the back surface of a transparent panel and the surface of an image display part. In particular, the visibility of an image of an electronic device that uses a reflective liquid crystal display device as an image display unit can be significantly improved.

It is sectional drawing of the portable game machine of the conventional structure which has an image display part. It is a disassembled perspective view of the portable game machine which has a structure of the Example of this invention. It is sectional drawing of the portable game machine which has a structure of the Example of this invention. It is sectional drawing of the portable game machine which has a structure of another Example of this invention. It is explanatory drawing which shows the preparation examples of the structure of the Example of this invention in steps. It is a perspective view of the transparent panel which the transparent member of this invention adhered. It is a graph which shows the light transmittance of various transparent base materials. It is sectional drawing of the example of a structural unit. It is a graph which shows the light transmittance by a spectrophotometer. It is explanatory drawing which shows the measuring method of the light transmittance and reflectance by a spectral reflection luminance meter.

  The structure for improving the visibility of an image of an electronic device according to the present embodiment constitutes a surface of an image display unit of the electronic device (hereinafter simply referred to as “screen”) and / or a part of an image display unit cover of the electronic device. A transparent member is brought into close contact with a transparent panel (hereinafter sometimes simply referred to as “transparent panel”). That is, the transparent member may be adhered to only one of the screen and the transparent panel, or the transparent member may be adhered to both the screen and the transparent panel. By bringing the transparent member into close contact with at least one of the surface of the transparent panel or the image display unit, the reflected light generated at the interface can be reduced. When the transparent member is brought into close contact with the transparent panel, the transparent member may be brought into close contact with not only the back surface of the transparent panel (inside the electronic device) but also the surface of the transparent panel (outside the electronic device).

  In addition, it is a particularly preferable aspect that a transparent member is in close contact between the front surface of the image display unit of the electronic device and the back surface of the transparent panel constituting a part of the image display unit cover of the electronic device. This is because the transparent member is in close contact with both the screen and the back surface of the transparent panel, the reflected light generated at both interfaces can be reduced, and the visibility can be further improved. In addition, when making a transparent member closely_contact | adhere to a screen or a transparent panel, it is preferable to keep bubbles from entering as much as possible. This is because the visibility of the part decreases if bubbles are introduced. Further, in the present invention, the “image display unit” refers to an image display device that is tackled as one component in the electronic device body.

  Below, the transparent member used by this embodiment is demonstrated first.

  In this embodiment, it is preferable to use a transparent member having a refractive index close to the refractive index of the material of the transparent panel or the surface substrate of the image display unit. This is because if the refractive index of the transparent member is a refractive index close to the refractive index of the material of the transparent panel and the surface base material of the image display unit, the reflected light at each interface can be reduced. When light is transmitted from the medium 1 having the refractive index n1 to the medium 2 having the refractive index n2, the reflectance at the interface between the medium 1 and the medium 2 can be expressed by the following equation.

Reflectance ρ = {(n1−n2) / (n1 + n2)} ²
Table 1 shows the refractive index of a material that may be used as a transparent panel material or a surface base material of an image display unit. These materials are frequently used as optical materials because they are excellent in transparency.

  From Table 1, the refractive index of polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), etc. when the refractive index of air is 1 is 1.49 to 1.59, relatively It can be seen that the refractive index is high. Therefore, in the present invention, it is desirable that the refractive index of the transparent member is 1.2 or more, more preferably 1.35 or more, and 1.6 or less, more preferably 1.5 or less. By doing so, the reflected light at each interface can be reduced.

In the present embodiment, the transparent member, a Young's modulus of 10 N / cm ² or more, preferably at 50 N / cm ² or more, 800 N / cm ² or less, preferably it is desirable to use a 600N / cm ² or less of the elastic body. By making the transparent member an elastic body, it can be applied to various shapes of transparent panels, and even when the transparent panel has a special shape, the compression pressure of the transparent member is uniformly applied to the surface of the liquid crystal display This is because the liquid crystal display unit can be protected. The reason why the Young's modulus of the elastic body is set to 10 to 800 N / cm ² is to control the pressure load on the screen. When the Young's modulus exceeds 800 N / cm ² , when the transparent member is compressed by the transparent panel, the load on the screen becomes too large. Further, if the Young's modulus is less than 10 N / cm ² , the transparent member is easily deformed too much, so that the adhesion to a transparent panel or the like is lowered and sufficient visibility cannot be obtained. Further, when such an elastic body is used as the transparent member, it is possible to absorb and disperse an impact from the outside. For example, when the transparent panel receives an impact, the image display unit can be protected.

  As the transparent member, it is preferable to use a material having a visible light transmittance of 85% or more, more preferably 90% or more in a wavelength range of 380 to 780 nm. The transmittance is an index of the transparency of the transparent member. When the transmittance is less than 85%, the light emitted from the screen is difficult to transmit through the transparent member, so that the visibility is lowered. . Further, when the wavelength region where the transmittance is 85% or more is narrower than the region of 380 nm to 780 nm, the transmittance of light on the red side (high wavelength side) or blue side (low wavelength side) decreases. It is not preferable. The transmittance of the transparent member may be measured using, for example, a spectrophotometer (V-550) manufactured by JASCO.

The shape of the transparent member, and transparency panel may be appropriately set depending on the shape of the image display unit, it is preferable to a sheet. This is because the surface of the image display unit of many electronic devices and the shape of the transparent panel are substantially flat. Further, as long as the transparent panel has a rounded curved surface as seen in some mobile phones, the sheet-like transparent member may be rounded. The sheet-like transparent member state, and are further surface roughness (Ra) of 10μm or less, good Mashiku is 5μm or less. This is because when the surface roughness (Ra) is larger than 10 μm, bubbles are easily generated when the transparent member is placed on the screen or when the transparent panel is brought into close contact with the transparent member. Further, from the viewpoint that it is preferably no possible air bubbles on the screen, the surface roughness of the sheet-like transparent member, generally 10μm hereinafter, good Mashiku is preferably set to 5μm or less.

  Although the thickness (D) of the said sheet-like transparent member is not specifically limited, For example, it may be larger or smaller than the distance (d) from the surface of the image display part of an electronic device to a transparent panel. It is also possible to use a sheet-like transparent member having a thickness (D) larger than the distance (d) and compress the sheet-like transparent member with the screen and the back surface of the transparent panel so as to be pressure-bonded to both sides. This is a preferred embodiment. This is because the transparent member can be fixed between the back surface of the transparent panel and the screen by pressing the transparent member on both sides. In addition, there is an advantage that bubbles are expelled from the interface even when bubbles are present on the back surface of the transparent panel or the interface between the screen and the transparent member. Although the minimum of the thickness (D) of the said sheet-like transparent member is not specifically limited, Preferably it is 0.1 mm, More preferably, it is 0.3 mm. It is because workability at the time of mounting a sheet-like transparent member will fall if thickness is too thin. Moreover, it is not preferable to make the thickness of the sheet too thick from an economical viewpoint.

  It is also a preferable aspect of the present invention to form an oil film between the surface of the image display unit and the transparent panel. For example, if oil is applied to the surface of the sheet-like transparent member on the transparent panel side to form an oil film, wettability to the transparent panel is improved, so that bubbles are generated at the interface between the transparent member and the transparent panel. Transparent panels can be installed without The same applies to the interface between the transparent member and the image display unit.

  A transparent gel or transparent rubber is used as the transparent member. Transparent gels and transparent rubbers have flexibility. For example, even if they are simply placed without applying a special load (force), they easily adhere to the surface of the image display unit or the transparent panel. It is. Further, even when bubbles are generated at the interface between the transparent gel or transparent rubber and the transparent panel, the mixed bubbles can be easily driven out by pressing with a finger or the like. Furthermore, it is also a preferred embodiment of the present invention that the oil blended in the transparent gel or transparent rubber uses a transparent gel or transparent rubber that is bleed on the surface thereof. This is because the oil that bleeds on the surface improves the wettability to the surface of the image display unit and the transparent panel, and bubbles are less likely to occur when the transparent member is applied.

  In the present invention, “gel” and “rubber” are classified according to hardness according to a JIS-A hardness meter, gel having a JIS-A hardness of less than 10 is gel, and rubber having a JIS-A hardness of 10 or more is rubber. And For example, if a polymer having a certain crosslinking density is blended in a large amount with a plasticizer and the JIS-A hardness is less than 10, it is a “gel”, and the blending amount of the plasticizer is reduced so that the JIS-A hardness is 10 or more Things shall be “rubber”. In particular, in the case of a gel, the hardness can be displayed by the penetration. The upper limit of the JIS-A hardness of the transparent rubber is not particularly limited, but is preferably 70, and more preferably 50. This is because when the JIS-A hardness exceeds 70, it becomes difficult to adhere to the transparent panel or the screen, and air bubbles are easily generated when the transparent rubber is attached.

  The transparent gel or transparent rubber is not particularly limited. For example, a gel or rubber obtained by mixing a crosslinked polymer material with a solvent or a plasticizer, or controlling the crosslinking density or structure of the crosslinked polymer material. In addition, the molecular chain of the linear polymer is intertwined into a gel or rubber, or the gel or rubber is controlled by controlling the skeleton structure or molecular weight of the linear polymer. It preferably has a structure. This is because the gel and rubber can be easily designed by controlling the amount of the solvent and plasticizer and the crosslinking density.

  In the present invention, a transparent gel or a molded article of transparent rubber can be used. For example, a curable liquid gel composition or a curable liquid rubber composition (hereinafter simply referred to as “curable liquid composition”). It is also a preferred embodiment to produce a transparent gel or transparent rubber molded product by placing and curing on the surface of the image display unit or the transparent panel.

  Examples of the polymer material constituting the transparent gel or transparent rubber include olefin resins such as polyethylene, chlorinated polyethylene, and polypropylene; ester resins such as polyethylene terephthalate and polybutylene terephthalate; acrylonitrile-styrene copolymer (AS ), Styrene resin such as acrylonitrile-butadiene-styrene copolymer (ABS) and polystyrene; polyamide resin such as nylon 6 and nylon 66; epoxy resin such as bisphenol A type, phenol novolac type and cresol novolac type; poly Polyurethanes such as ethers and polyesters; polymers such as polymethyl methacrylate (PMMA), methyl methacrylate (MMA) / styrene copolymer, MMA / α-methylstyrene copolymer Vinyl resins such as polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetate, ethylene-vinyl acetate copolymer, polyvinyl formal, polyvinyl butyral; polycarbonates; phenol resins; polyacetals; Fluoropolymers such as tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride; silicone resin, natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butadiene rubber, isoprene rubber, butyl rubber, ethylene- Various rubbers such as propylene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, acrylic rubber, fluorine rubber, silicone rubber, hydrin rubber, polysulfide rubber, polyurethane rubber and the like can be mentioned.

  Examples of the solvent or plasticizer blended in the polymer material, that is, the solvent or plasticizer blended in the transparent gel or transparent rubber include phthalate esters such as dibutyl phthalate and dioctyl phthalate; -Trimellitic acid ester such as ethylhexyl) trimellitate; Aliphatic dibasic acid ester such as dibutyl adipate, bis (butylglycol) adipate, dibutyl sebacate; trimethyl phosphate, triethyl phosphate, tris (2-ethylhexyl) phosphate, triphenyl Phosphate esters such as phosphate; silicone oil, paraffinic oil (containing 50% or more of paraffin chains), naphthenic oil (containing 30-45% of naphthenic ring carbon), aromatic (aromatic) oil (containing aromatic carbon 30 Oils such as acetone and methyl ethyl ketone; ester solvents such as ethyl acetate and butyl acetate; alcohols such as methanol, ethanol and propanol; dimethylformamide, tetrahydrofuran, N-methyl-2- In addition to various solvents such as pyrrolidone and dimethyl sulfoxide, water may be used.

  As the curable liquid composition, for example, a two-component curable urethane resin composition that is cured by a reaction between an isocyanate group and an active hydrogen such as a hydroxyl group or an amino group, or a crosslinking reaction such as a silanol group or a vinyl group is used. Liquid silicone rubber composition, natural rubber using vulcanization / crosslinking reaction, liquid rubber composition such as isoprene rubber, butadiene rubber, butyl rubber, etc., liquid epoxy resin using curing reaction between epoxy group and amino group or hydroxyl group Examples thereof include a composition, a liquid phenol resin composition utilizing a reaction between phenol and formalin, and a curable liquid unsaturated polyester / vinyl ester composition.

  The curable liquid composition further comprises a solvent or a plasticizer as described above for adjusting the viscosity or hardness of the resulting transparent gel or transparent rubber; a peroxide for promoting / controlling the curing reaction, organic It may contain a catalyst such as a metal compound, an acidic catalyst or a basic catalyst; and a reactive diluent such as a monomer or a low molecular weight polyfunctional compound.

  In the present invention, in consideration of the transparency, Young's modulus, hardness, etc. of the gel or rubber to be obtained, such a polymer material, plasticizer, solvent, etc. are selected or combined to obtain a transparent gel or transparent rubber. Obtainable. Among these, the transparent gel includes silicone gel, polyethylene gel, acrylic gel, urethane gel, butadiene gel, isoprene gel, butyl gel, styrene butadiene gel, ethylene vinyl acetate copolymer gel, ethylene-propylene-diene ternary copolymer. Polymer gel, fluorine gel, gelatin gel, agar gel, konjac gel and the like can be mentioned. Examples of the transparent rubber include natural rubber, styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), butadiene rubber (BR), isoprene rubber (IR), butyl rubber (IIR), Examples include ethylene-propylene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, acrylic rubber, fluororubber, silicone rubber, hydrin rubber, polysulfide rubber, and polyurethane rubber.

  The use of transparent silicone gel or transparent silicone rubber as the transparent member is a highly preferred embodiment of the present invention. This is because the silicone gel or the silicone rubber is extremely excellent in transparency and has flexibility, so that it has excellent adhesion to the surface of the image display portion and the transparent panel. Moreover, the refractive index of transparent silicone gel or transparent silicone rubber is about 1.2 to 1.53, which is suitable for reducing reflected light. In addition, the refractive index of transparent silicone gel or transparent silicone rubber can be adjusted with the kind of substituent of a polysiloxane side chain. For example, when a phenyl group is employed as a substituent, the refractive index is increased, and when a fluoroalkyl group is employed, the refractive index is decreased.

The transparent silicone gel or silicone rubber is an organosiloxane having a siloxane bond as a basic skeleton and appropriately three-dimensionally cross-linked, and is represented by an average unit formula RaSiO _{(4-a) / 2} . In the formula, R represents an alkyl group having 1 to 10 carbon atoms, preferably 1 to 8 carbon atoms such as a methyl group, an ethyl group, a propyl group, or a butyl group; 1 to 10 carbon atoms such as a vinyl group, an allyl group, or a butenyl group. , Preferably 1 to 8 alkenyl groups; aryl groups such as phenyl groups and tolyl groups; alkyl groups, alkenyl groups, and chloromethyl groups in which some or all of the hydrogen atoms bonded to carbon atoms of the aryl groups are substituted with halogen atoms Halogen substituted hydrocarbon groups such as chloropropyl group, 3,3,3-trifluoropropyl group; some or all of hydrogen atoms bonded to carbon atoms of alkyl group, alkenyl group and aryl group are substituted with cyano group A substituted or unsubstituted hydrocarbon group having 1 to 10 carbon atoms selected from a cyano-substituted hydrocarbon group such as a 2-cyanoethyl group. In the formula, a is preferably 1.95 to 2.05.

  The transparent silicone gel or transparent silicone rubber is obtained, for example, by curing a curable liquid silicone gel composition or a curable liquid silicone rubber composition (hereinafter sometimes simply referred to as “curable liquid silicone composition”). be able to. Further, as described above, these curable liquid silicone compositions may be cured on the surface of the image display unit or on the transparent panel.

  The curable liquid silicone composition is not particularly limited as long as it generates a transparent silicone gel or a transparent silicone rubber by a curing reaction, and includes, for example, an organopolysiloxane having a functional group, a crosslinking agent, and a catalyst. Things. Examples of the organopolysiloxane having a functional group include dimethylpolysiloxane having a silanol group or a vinyl group at the terminal. Examples of the crosslinking agent include trifunctional or higher functional silane monomers, siloxanes such as hydrogenorganosiloxane, metal alcoholates such as alkyl orthosilicates, and the like. Examples of the catalyst include platinum compounds, organometallic compounds such as dibutyltin diacetate and dibutyltin dilaurate, and metal fatty acid salts such as tin octenoate. The kind and amount of the crosslinking agent and catalyst may be appropriately determined in consideration of the pot life and the curing rate. The curable liquid silicone composition may be cured at, for example, 90 ° C. or higher, more preferably 130 ° C. or higher and 210 ° C. or lower, more preferably 200 ° C. or lower. Further, the curing time can be set, for example, based on the thickness of the obtained transparent silicone rubber or gel, and at a curing temperature of 150 ° C., the curing time per 1 mm thickness is 10 seconds.

  In order to improve the visibility of the entire screen, the transparent member obtained by the method as described above is closely attached to the entire screen of the image display unit, or the transparent member is freely attached to the back surface of the transparent panel or the screen. It is also a preferable aspect to make it. If the transparent member can be removed, even if a bubble is generated between the transparent member and the surface of the transparent panel or the image display unit, the transparent member can be placed again so that the bubble can be removed. This is because the maintenance can be facilitated.

  Next, a transparent panel that constitutes a part of an image display unit cover (hereinafter sometimes simply referred to as an “image display unit cover”) of an electronic device will be described. The transparent panel constitutes a part of the image display unit cover, and is provided to face the screen so that the screen of the image display unit provided in the electronic device main body can be visually recognized. The image display unit cover of the electronic device may be a member that covers the image display unit of the electronic device. For example, in the case of an electronic device such as a portable game machine or a mobile phone, the image display unit cover is: It may be an electronic device body cover that integrally covers the entire electronic device body, and a screen for showing the operation contents of the electronic device as seen in a large electronic device such as a FAX machine or a copy machine. A cover that partially covers the operation buttons and the like may be used.

  The transparent panel constitutes a part of the image display unit cover, and may be a member that is integral with or removable from the image display unit cover. The case where the transparent panel and the image display unit cover are integrated includes, for example, a case where the transparent panel is incorporated inside the image display unit cover, and a case where the transparent panel and the image display unit cover are integrally formed. In the state where the image display unit cover is attached to the electronic device main body, only the transparent panel cannot be detached. The member from which the transparent panel can be removed refers to a case where the transparent panel can be detached from the image display unit cover in a state where the image display unit cover is attached to the main body of the electronic device. The material of the transparent panel is not particularly limited. For example, the transparent panel is made of transparent plastics such as polycarbonate, polyethylene terephthalate, and polymethacrylate, or glass.

  The means for attaching the image display unit cover of the electronic device to the electronic device main body is not particularly limited. For example, attachment with an adhesive, screw tightening mechanism, a screw provided with a claw or a barb, etc. For example, a fitting mechanism that fits into a groove or a hole having a shape that engages with each other. Among these, it is preferable that a screw tightening mechanism is adopted as the attachment means, and the transparent member is brought into close contact with the surface of the image display unit and the back surface of the transparent panel by adjusting the screw tightening pressure. In such a case, the transparent member can be fixed by being crimped to the surface of the image display unit and the back surface of the transparent panel. Moreover, it is also preferable to provide a margin for crushing the transparent member around the transparent member between the screen and the transparent panel. This is because, when there is a crushing margin, the transparent member is deformed in the direction in which the crushing margin is provided when the transparent member is excessively compressed, so that an excessive pressure load in the screen direction can be suppressed.

  It is preferable that the outer side (surface) of the transparent panel is further subjected to antireflection processing. This is because visibility can be further improved by preventing reflection on the outside of the transparent panel. As the antireflection process, the transparent panel may be directly subjected to an antireflection process, or a film subjected to an antireflection process may be attached. Examples of the anti-reflection process include an anti-glare process for diffusing reflected light with irregularities on the surface; a process of vacuum-depositing magnesium fluoride on a transparent panel to provide a transparent thin film having a quarter wavelength of visible light; A process of attaching a laminated film of a high refractive index material layer and a low refractive index layer, such as alternately laminating titanium oxide layers and silicon oxide layers, to the surface of a transparent panel; or silicone resin or fluororesin (such as glass For example, a coating process on the surface of a transparent panel using a low refractive index substance may be mentioned.

  Hereinafter, the visibility improving structure of the present invention will be described with reference to the drawings, but the present invention is not limited to such description.

  FIG. 2 is an exploded perspective view of the portable game machine having the visibility improving structure of the present invention, and is an example of a member in which the transparent panel 1 can be removed from the image display unit cover 5. Here, the image display unit cover 5 is a cover that integrally covers the electronic device main body. The transparent member 2 is placed on the surface 3 of the image display unit provided in the electronic device main body. In that case, it mounts so that a bubble may not arise in the interface of the surface 3 of the image display part, and the transparent member 2. FIG. When bubbles are generated, they may be removed by pressing with a finger or the like. Next, the transparent panel 1 may be attached to the image display unit cover 5. When the transparent panel 1 is attached, for example, an adhesive 8 may be applied to the peripheral portion 4 of the screen of the image display portion, and the peripheral portion (non-transparent portion) 1b of the transparent panel may be pasted. Moreover, if oil is apply | coated to the transparent panel side of the transparent member 2 and an oil film is formed, a transparent panel can be mounted, without producing a bubble.

  The transparent member 2 is first attached or adhered to the transparent panel 1, and then the transparent panel 1 is attached to the image display cover 5 so that the transparent member 2 is attached to the front surface 3 of the image display unit and the back surface of the transparent panel 1. You may make it closely_contact | adhere.

  FIG. 3 is a cross-sectional view of an electronic device to which a transparent panel is attached. The transparent panel 1 is bonded by an image display unit cover 5 and an adhesive 8, and the transparent member 2 is in close contact with the front surface 3 of the image display unit and the back surface of the transparent panel 1. The image display unit cover 5 is attached to the electronic device main body 6 by a screw tightening mechanism 7, and the transparent member 2 can be bonded to the back surface of the transparent panel 1 and the screen 3 by increasing the tightening pressure of the screws. .

  FIG. 4 shows a case where the transparent panel 1 is provided inside the image display unit cover 5. The transparent panel 1 is bonded to the image display unit cover 5 by applying an adhesive 8 to the peripheral portion 1b. Further, a crushing margin 10 is provided around the transparent member between the transparent panel 1 and the surface 3 of the image display unit. With this configuration, even if the transparent member 2 is pressure-bonded by the screw tightening mechanism 7, a force that peels off the bonded portion between the transparent panel 1 and the image display unit cover 5 does not work. Further, even when the pressure bonding is strongly performed, the deformed transparent member 2 enters the crushing margin 10, so that an excessive pressure load is not applied to the surface 3 of the image display unit.

  FIG. 5 is a perspective view showing in steps a preparation example of a transparent gel or transparent rubber using the curable liquid composition 11. A transparent panel on which the curable liquid composition 11 is placed on the surface 3 of the image display unit of the electronic device, and the back surface of the transparent panel 1 constituting a part of the image display unit cover 5 is wetted with the liquid gel or rubber composition. 1 is attached to the image display unit cover 5. Thereafter, the curable liquid composition 11 is cured to produce a transparent gel or transparent rubber, and the transparent gel or transparent rubber is brought into close contact with the front surface 3 of the image display unit and the back surface of the transparent panel 1. do it. The curing reaction is preferably a room temperature curing reaction from the viewpoint of protecting the electronic device.

FIG. 6 is a perspective view of a transparent panel in which a transparent gel or transparent rubber is applied to the back surface of the transparent panel 1 using a curable liquid composition. A transparent panel coated with transparent rubber or the like can be obtained by placing a curable liquid gel or rubber composition on the back surface of the transparent panel 1 and then curing it. The manufacturing method of the transparent panel to which the transparent gel or the transparent rubber is adhered is not particularly limited. For example, the transparent panel 1 can be manufactured by using an injection molding machine, the transparent panel 1 is set in a mold, and the transparent panel 1 is predetermined. A curable liquid gel or rubber composition is injected into the place of the material to be cured. The injection molding conditions may be set as appropriate. For example, the curing temperature is 130 to 200 ° C. and the injection pressure is 40 to 120 kg / cm ² . Moreover, when making it harden | cure at comparatively high temperature, it is preferable to use the heat-resistant plastics, such as a polycarbonate which has heat resistance, or a polyethylene terephthalate, or a glass transparent panel as a transparent panel, for example.

  Moreover, this invention is a transparent member used for the visibility improvement structure of the image of an electronic device as mentioned above, The preferable aspect of the said transparent member is as having mentioned above.

  The present invention is further an electronic device having the above-described visibility improving structure. The electronic device is not particularly limited as long as it has an image display unit. For example, a mobile phone, a personal digital assistant (PDA), a portable game machine, a portable electronic dictionary, a portable TV, a portable DVD player, a compact disc ( In addition to portable electronic devices such as CD) players, mini-disc (MD) players, and notebook computers, it can also be used in electronic devices such as televisions, telephones, fax machines, copiers, microwave ovens, washing machines, and refrigerators.

  Further, the image display unit provided in the electronic device is not particularly limited, and examples thereof include a liquid crystal display device, a plasma display device, an organic electroluminescence display device, a cathode ray tube display device, or a field emission display device. Regardless of the color display device.

  In particular, the visibility improving structure of the present invention can be suitably used when the image display unit is a color liquid crystal display device, more preferably a reflective color liquid crystal display device. This is because the color liquid crystal display device is easily affected by external light, and the visibility is easily lowered. In addition, since the reflective color liquid crystal liquid crystal display device does not use a backlight, an image cannot be visually recognized unless external light is taken in. Therefore, the reflective color liquid crystal liquid crystal display device is further affected by external light.

EXAMPLES Hereinafter, the present invention will be described by way of examples. However, the present invention is not limited by the following examples, and all modifications and embodiments within the scope of the present invention are within the scope of the present invention. include.
(1) Measurement of transmittance in visible light region having wavelength of 380 to 780 nm The light transmittance of each material of transparent silicone rubber, polycarbonate, polymethacrylate and polyethylene terephthalate was measured. The results are shown in FIG.

From FIG. 7, it can be seen that the transparent silicone rubber has a light transmittance of 90% or more in the visible light region having a wavelength of 380 to 780 nm, and is extremely excellent in transparency. From this result, it can be seen that transparent silicone rubber can be suitably used as the transparent member of the present invention.
(2) Effect of Adherence Mode of Transparent Member on Light Transmittance After RTV-ME601 manufactured by Asahi Kasei / Wacker Silicone Co. is blended at a ratio of A agent: B agent = 9: 1 and vacuum degassed, 90 ° C. for 10 minutes Was heated and cured to obtain a sheet-like transparent silicone rubber having a thickness of 2.5 mm and a JIS-A hardness of 50.

  A structural unit as shown in FIGS. 8A to 8D using a 1.5 mm thick glass plate, a 1.0 mm thick polycarbonate plate, and the sheet-like transparent silicone rubber as a transparent member. 1-4 were produced. Each structural unit models a part in which the image display unit is taken into the electronic device main body. In each structural unit, the glass plate 24 is a protective panel provided on the surface or inside the image display unit. A glass plate is assumed. The structural unit 1 (FIG. 8A) is a structure of a conventional electronic device that does not use the transparent member 2 and has an air layer 15 having a thickness of 2.5 mm. In the structural unit 2 (FIG. 8B), the transparent member 2 adheres only to the glass plate 24, and in the structural unit 3 (FIG. 8C), the transparent member 2 adheres only to the back surface of the transparent panel 1. In this case, the thickness of the air layer 15 is 0.5 mm. The structural unit 4 (FIG. 8D) is a case where the transparent member 2 is in close contact with the back surface of the transparent panel 1 and both surfaces of the glass plate 24. The sheet-like transparent silicone rubber is in close contact with the PC plate or the glass plate so that bubbles do not enter. About the structural units 1-4, the spectral transmission factor was measured using the JASCO V-550 spectrophotometer. The measurement results are shown in FIG.

9, the transmittance of the structural units 1 to 4 is higher in the order of structural unit 4> structural unit 2, 3> structural unit 1, and the transparent member 2 is in close contact with the back surface of the transparent panel 1 and the glass plate 24. It can be seen that the transmittance of the unit 4 is the highest. On the other hand, the transmittance of the structural unit 1 in which the transparent member 2 is not used and only the air layer 15 exists between the transparent panel 1 and the glass plate 24 is the lowest. From these results, the structure in which the transparent member is adhered to at least one of the surface of the transparent panel or the image display unit can increase the light transmittance to the image display unit, and the back surface of the transparent panel and the image display It is considered that the structure in which the transparent member is closely attached to both surfaces of the surface of the part can remarkably improve the visibility of the image.
(3) Measurement of transmittance and reflectance Using CY52-205 made by Toray Dow Corning Silicone Co., Ltd., a sheet-like transparent silicone rubber having a thickness of 3 mm and a JIS-A hardness of 40 was produced.

Using the glass plate, the polycarbonate (PC) plate, and the sheet-like transparent silicone rubber as the transparent member, the structural units 5 to 7 of the electronic device as shown in Table 2 were assembled. The structural unit 5 has the structure shown in FIG. 8A and a conventional structure that does not use a transparent member. The structural unit 6 has the structure shown in FIG. 8D, and a transparent member is in close contact with the back surface of the transparent panel and both surfaces of the glass plate. The structural unit 7 further has an antireflection (AR) film attached to the outside of the transparent panel. In each structural unit, the sheet-like transparent silicone rubber is closely attached so that bubbles do not enter the interface with the PC plate or glass plate. As shown in FIG. 8, the spectral reflection luminance meter (PHOTO)
It was installed at an angle of 45 ° at a point 300 mm away from RESEARCH PR-704), and the reflectance and transmittance were measured. The results of measuring the reflectance and transmittance of each unit are shown in Table 2.

  The structural unit 5 is a case where an air layer exists between the transparent panel and the glass plate, and has a high reflectance and a low transmittance. The structural unit 6 is a case where the sheet-like transparent silicone rubber is in close contact with the back surface of the transparent panel and the glass plate, and the transmittance is higher and the reflectance is lower than the structural unit 5. The structural unit 7 is a case where antireflection processing is further applied to the outside of the transparent panel of the unit 6. The transmittance was as extremely high as 95.75%, and the reflectance was as extremely low as 4.01%.

  From these results, when the electronic apparatus has the visibility improving structure of the present invention such as the structural unit 6 or 7 as compared with the case where the electronic apparatus has the conventional structure such as the structural unit 5, reflection at each interface is performed. It is considered that light can be reduced and visibility can be remarkably improved.

1: transparent panel, 1a: transparent part, 1b: peripheral part (non-transparent part), 2: transparent member, 3: surface of image display part, 4: peripheral part of image display part, 5: image display part of electronic device Cover: 6: Electronic device main body, 7: Screw tightening mechanism, 8: Adhesive, 9: Image display unit, 10: Crushing, 11: Curable liquid gel or rubber composition, 12: External light, 13: Transmitted light , 14: reflected light, 15: air layer, 16: protective panel, 17: polarizing filter, 18: glass plate, 19: color filter, 20: liquid crystal layer, 21: glass plate, 22: polarizing filter, 23: reflecting plate 24: Glass plate, 25: Spacer

Claims (5)

The image display unit cover of the electronic device (a member for covering the image display unit provided in the electronic device main body) is partly opposed to the screen so that the screen of the image display unit can be visually recognized. On the outer surface of the transparent panel having a refractive index of 1.49 to 1.59 arranged as follows :
Refractive index 1.2 to 1.6, a JIS A hardness of 70 or less under a transparent member surface roughness (Ra) is made of transparency gels or transparent rubber having the following bonding surface 10 [mu] m, remove it and A structure for improving the visibility of an image of an electronic device, characterized by being adsorbed so that bonding can be performed freely .   The structure for improving the visibility of an image of an electronic device according to claim 1, wherein the transparent member is made of transparent silicone gel or transparent silicone rubber.   The structure for improving the visibility of an image of an electronic device according to claim 1, wherein the electronic device is a portable electronic device. The electronic device according to any one of claims 1 to 3, wherein another transparent member is in close contact between the inner back surface of the transparent panel and the surface of the image display unit of the electronic device. Improved image visibility. The electronic device which has a visibility improvement structure of any one of Claims 1-4 .

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