WO2017119399A1 - Plaque de guidage de lumière - Google Patents

Plaque de guidage de lumière Download PDF

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Publication number
WO2017119399A1
WO2017119399A1 PCT/JP2016/089130 JP2016089130W WO2017119399A1 WO 2017119399 A1 WO2017119399 A1 WO 2017119399A1 JP 2016089130 W JP2016089130 W JP 2016089130W WO 2017119399 A1 WO2017119399 A1 WO 2017119399A1
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WO
WIPO (PCT)
Prior art keywords
glass
light
ppm
less
guide plate
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PCT/JP2016/089130
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English (en)
Japanese (ja)
Inventor
井上　政広
鈴木　克巳
近藤　裕己
和田　直哉
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旭硝子株式会社
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Publication of WO2017119399A1 publication Critical patent/WO2017119399A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium

Definitions

  • the present invention relates to a light guide plate used in a liquid crystal display device.
  • the liquid crystal display device includes a liquid crystal panel, a light guide plate facing the liquid crystal panel, and a light source that irradiates the liquid crystal panel with light through the light guide plate (see, for example, Patent Document 1).
  • the light guide plate has a resin plate as a base material and a light scattering portion formed on the resin plate.
  • the light guide plate is required to be highly transmissive and to extract light of an achromatic color and a uniform color in the plane as much as possible. This demand is further increased as the liquid crystal display device becomes thinner and larger.
  • the resin plate has an end surface into which light is incident from the light source, a light extraction surface from which the light incident on the end surface is extracted, and a light scattering surface facing the light extraction surface.
  • a plurality of light scattering portions are arranged on the light scattering surface.
  • Each light scattering portion includes a plurality of light scattering particles and a binder that binds the plurality of light scattering particles.
  • the light scattering particles and the binder have different refractive indexes.
  • Light from the light source enters the inside of the resin plate from the end surface of the resin plate, repeats total reflection, spreads throughout the inside of the resin plate, and is scattered by the light scattering surface of the resin plate from the light extraction surface of the resin plate. Get out and illuminate the LCD panel.
  • a glass plate has been studied as a base material for a light guide plate from the viewpoint of rigidity, heat resistance and water resistance.
  • the light absorption by the conventional glass plate tended to be larger than the light absorption by the resin (PMMA, MS, etc.) generally used for the light guide plate.
  • the resin PMMA, MS, etc.
  • the color of light propagating in the glass plate changes depending on the propagation distance. That is, even if the light has uniform chromaticity at the time of incidence, the light extracted from the light extraction surface after propagating a short distance and the light extracted from the light extraction surface after propagating a long distance
  • chromaticity is different and color unevenness occurs in the surface.
  • the present invention has been made in view of the above-mentioned problems, and has as its main object to provide a light guide plate that reduces the color unevenness of light extracted from the light extraction surface of the glass plate to such an extent that it cannot be visually recognized.
  • a glass plate having an end face into which light is incident from a light source, a first main surface for taking out light incident on the end face, and a second main surface facing the first main surface;
  • the glass plate is expressed in terms of mass percentage based on oxide, Fe 2 O 3 is 1 mass ppm to 50 mass ppm, NiO is 0.01 mass ppm to 2.0 mass ppm, and Cr 2 O 3 is 0.01 mass. It is characterized by comprising a glass having ppm to 2.0 mass ppm, MnO 2 0.01 mass ppm to 50 mass ppm, TiO 2 0.01 mass ppm to 1000 mass ppm, and iron redox being 25% or less.
  • a light guide plate is provided.
  • a light guide plate is provided in which variation in chromaticity of light extracted from the light extraction surface of the glass plate is reduced.
  • FIG. 1 It is a figure which shows the liquid crystal display device containing the light-guide plate by one Embodiment. It is a figure which shows the measuring point of the chromaticity of the glass light-guide plate by the test example 1. FIG. It is a figure which shows another measuring point of the chromaticity of the glass light-guide plate by the test example 1.
  • FIG. 1 is a diagram illustrating a liquid crystal display device including a light guide plate according to an embodiment.
  • the liquid crystal display device includes a liquid crystal panel 10, a light guide plate 20 facing the liquid crystal panel 10, and a light source 50 that emits light to the liquid crystal panel 10 through the light guide plate 20.
  • the liquid crystal panel 10 includes, for example, an array substrate, a color filter substrate, and a liquid crystal layer.
  • the array substrate includes a substrate and an active element (for example, TFT) formed on the substrate.
  • the color filter substrate includes a substrate and a color filter formed on the substrate.
  • the liquid crystal layer is formed between the array substrate and the color filter substrate.
  • the light guide plate 20 includes a glass plate 30 as a base material and a light scattering portion 40.
  • the glass plate 30 may be a flat plate.
  • the plate thickness of the glass plate 30 is preferably 10 mm or less, more preferably 4 mm or less. Even more preferably, it is 3 mm or less. If the plate thickness is 10 mm or less, the weight and thickness of the liquid crystal display device can be in an appropriate range. Further, the thickness of the glass plate 30 is preferably 0.3 mm or more, more preferably 0.7 mm or more. Still more preferably, 1.0 mm or more is good. If the plate thickness is 0.3 mm or more, it has appropriate rigidity and can ensure the self-supporting property of a single glass. Further, if the plate thickness is 0.3 mm or more, the glass plate thickness is equal to or greater than the width of the light source, so that light can be efficiently incident on the glass plate 30. The plate thickness of the glass plate 30 is substantially uniform.
  • the glass plate 30 has a first end face 31 on which the light source 50 is disposed.
  • the first end surface 31 is also referred to as a light incident surface 31.
  • the light incident surface 31 is a surface on which light from the light source 50 is incident.
  • the glass plate 30 has a second end face 32 that faces the first end face 31.
  • the second end face 32 is also referred to as a light incident face 32.
  • a light reflection layer may be formed on the light incident surface 32. Since the light reflecting layer reflects the light that has propagated through the glass plate 30 and reached the incident light facing surface 32 toward the inside of the glass plate 30 again, it is effective for further improving the luminance of the glass plate 30 and reducing color unevenness. Is.
  • the glass plate 30 has a first main surface 35 that faces the liquid crystal panel 10.
  • the first main surface 35 is also referred to as a light extraction surface 35.
  • the light extraction surface 35 is a surface for extracting light propagating inside the glass plate 30.
  • the glass plate 30 has a second main surface 36 that faces the first main surface 35.
  • This second main surface 36 is also called a light scattering surface 36.
  • the light scattering surface 36 is a surface on which the light scattering portion 40 is formed.
  • the light scattering unit 40 is disposed on the light scattering surface 36 and scatters at least a part of the light propagating through the glass plate 30.
  • the light scattering portion 40 is formed in a dot shape, for example, and is disposed so as to become denser as it goes farther from the first end surface 31 toward the second end surface 32.
  • the details of the glass plate 30 and the light scattering portion 40 will be described later.
  • the longitudinal dimension that effectively enables color unevenness suppression of the light guide plate of the present invention is 500 mm or more, particularly 550 mm or more.
  • the light source 50 irradiates the light incident surface 31 of the glass plate 30 with light.
  • Light from the light source 50 enters the inside from the light incident surface 31 of the glass plate 30, repeats total reflection, spreads over the entire interior, and is scattered by the light scattering surface 36 to exit from the light extraction surface 35, so that the liquid crystal panel Illuminate 10 uniformly from behind.
  • the white LED may be composed of, for example, a blue LED and a phosphor that receives and emits light from the blue LED.
  • the phosphor include YAG, oxide, aluminate, nitride, oxynitride, sulfide, oxysulfide, rare earth oxysulfide, halophosphate, and chloride.
  • a white LED may be composed of a blue LED and a yellow phosphor.
  • white LED may be comprised by blue LED, green fluorescent substance, and red fluorescent substance. Since the light from the latter white LED is a mixture of the three primary colors of light, it is more excellent in color rendering.
  • a scattering film, a brightness enhancement film, a reflective polarizing film, a 3D film, a polarizing plate, and the like may be disposed between the light guide plate 20 and the liquid crystal panel 10.
  • a reflective film or the like may be disposed behind the light guide plate 20.
  • the light source 50, the light guide plate 20, and various optical films are collectively referred to as a backlight unit.
  • the light scattering unit 40 includes a plurality of hollow particles 41.
  • a known method can be applied. For example, a method in which a mixed solution of the hollow particles 41 and the binder 42 is applied to glass and then cured by ultraviolet irradiation can be applied.
  • the light scattering portion may be formed of solid fine particles widely used in the resin plate for the light guide plate.
  • the light emitted in the vicinity of the incident light facing surface 32 becomes slightly yellow, color unevenness is suppressed by appropriately designing the absorption coefficient of the glass.
  • the shorter the wavelength the stronger the scattering intensity, and there is a tendency to scatter mainly forward. It is considered that the light emitted to the incident light facing surface 32 side becomes red after scattering, and becomes yellow on the incident light facing surface 32 side due to the color mixture with the light that has become green after being absorbed by the glass.
  • the light scattering portion is formed of hollow particles, color unevenness is further suppressed as compared with the case where solid particles are used in glass with an appropriately designed absorption coefficient. If the absorption coefficient of the glass is not designed appropriately, there is a concern that the light emitted in the vicinity of the light incident surface 32 will be closer to blue. This is because in light scattering by hollow particles, the longer the wavelength, the stronger the scattering intensity and the stronger the backward scattering.
  • the hollow particles 41 have, for example, an outer shell and voids formed inside the outer shell.
  • the outer shell is formed of a polymer, for example.
  • the outer diameter of the hollow particles 41 is, for example, 0.4 ⁇ m to 5 ⁇ m, preferably 0.4 ⁇ m to 4 ⁇ m, more preferably 0.4 ⁇ m to 3 ⁇ m, and still more preferably 0.5 ⁇ m to 2 ⁇ m.
  • the manufacturing method of the hollow particle 41 is demonstrated.
  • a specific monomer (first polymerizable monomer) ( ⁇ ) is emulsion-polymerized in an aqueous medium to prepare a dispersion of the first polymer particles (i), and then the surface layer of the first polymer particles (i) is specified
  • the pH of the dispersion of the core-shell polymer particles (ii) is adjusted to 7 or more (25 ° C.
  • aqueous dispersion (iii) is prepared.
  • the crosslinked hollow polymer particle aqueous dispersion (iii) is dried to obtain hollow particles made of a substance containing a polymer and air.
  • the first polymerizable monomer ( ⁇ ) includes an unsaturated carboxylic acid ( ⁇ -1) (hereinafter sometimes referred to as “monomer ( ⁇ -1)”) and a radical polymerizable monomer ( ⁇ -2) (hereinafter referred to as “monomer ( ⁇ -1)”). (Sometimes referred to as “monomer ( ⁇ -2)”).
  • Examples of the monomer ( ⁇ -1) include mono- or dicarboxylic acids such as (meth) acrylic acid, crotonic acid, maleic acid, fumaric acid, and itaconic acid, and acid anhydrides of the dicarboxylic acid.
  • mono- or dicarboxylic acids such as (meth) acrylic acid, crotonic acid, maleic acid, fumaric acid, and itaconic acid, and acid anhydrides of the dicarboxylic acid.
  • Examples of the monomer ( ⁇ -2) include unsaturated carboxylic acid esters such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, Examples thereof include aromatic monomers such as styrene and ⁇ -methylstyrene, (meth) acrylonitrile, vinyl acetate, N, N-dimethyl (meth) acrylamide and the like.
  • a core-shell polymer in which the surface layer of the first polymer particles (i) is coated with a shell layer containing a second polymer derived from a specific second polymerizable monomer ( ⁇ ) and an unreacted second polymerizable monomer ( ⁇ ) is coated with a shell layer containing a second polymer derived from a specific second polymerizable monomer ( ⁇ ) and an unreacted second polymerizable monomer ( ⁇ )
  • ⁇ a core-shell polymer in which the surface layer of the first polymer particles (i) is coated with a shell layer containing a second polymer derived from a specific second polymerizable monomer ( ⁇ ) and an unreacted second polymerizable monomer ( ⁇ )
  • the second polymerizable monomer ( ⁇ ) is a crosslinkable radical polymerizable monomer ( ⁇ -1) (hereinafter sometimes referred to as “monomer ( ⁇ -1)”) 10% by mass to 80% by mass, unsaturated carboxylic acid 0% by mass to 20% by mass of acid ( ⁇ -2) (hereinafter sometimes referred to as “monomer ( ⁇ -2)”) and other radical polymerizable monomers copolymerizable with monomer ( ⁇ -1) ( ⁇ -3) (hereinafter sometimes referred to as “monomer ( ⁇ -3)”) 0 to 90% by mass.
  • ⁇ -1 crosslinkable radical polymerizable monomer
  • ⁇ -2 unsaturated carboxylic acid 0% by mass to 20% by mass of acid
  • ⁇ -3 radical polymerizable monomers copolymerizable with monomer ( ⁇ -1) ( ⁇ -3)
  • first polymer particles (i) 100 parts by mass of the second polymerizable monomer ( ⁇ ) is emulsified in an aqueous solvent in the presence of 5 to 1000 parts by mass of the first polymer particles (i).
  • a core-shell shape in which a shell layer containing a second polymer derived from the second polymerizable monomer ( ⁇ ) and an unreacted second polymerizable monomer ( ⁇ ) is coated on the surface layer of the first polymer particles (i) by polymerization.
  • a dispersion of polymer particles (ii) is prepared.
  • the monomer ( ⁇ -1) divinylbenzene, trivinylbenzene, dicyclopentadiene, butadiene, isoprene, allyl glycidyl ether, glycidyl (meth) acrylate, ethylene glycol dimethacrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol Crosslinkable radically polymerizable monomers such as tri (meth) acrylate and dipentaerythritol hexa (meth) acrylate can be used.
  • the same unsaturated carboxylic acid as the example of the monomer ( ⁇ -1) described above can be used.
  • (meth) acrylic acid is preferable from the viewpoint of particle stability. Itaconic acid and the like are preferable.
  • Examples of the monomer ( ⁇ -3) include monoethylenic aromatic compounds such as styrene and ⁇ -methylstyrene, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, Non-crosslinking radically polymerizable monomers such as unsaturated carboxylic acid esters such as 2-ethylhexyl (meth) acrylate, (meth) acrylonitrile, vinyl acetate, and N, N-dimethyl (meth) acrylamide can be used. Among these, monoethylenic aromatic compounds such as styrene are preferable.
  • a binder component for forming the binder 42 by obtaining a hollow particle-containing liquid composition by solvent replacement with the crosslinked hollow polymer particle aqueous dispersion (iii), and other desired It is also possible to add a component to be used for forming a dot pattern containing hollow particles.
  • a resin having high transparency to visible light is used.
  • a resin is preferably at least one selected from the group consisting of a thermosetting resin, a thermoplastic resin, and a photocurable resin.
  • thermosetting resin used for the binder 42 known resins can be used, and epoxy resins, melamine resins, and phenol resins are preferable. These may be used alone or in combination of two or more.
  • thermoplastic resin used for the binder 42 known resins can be used.
  • olefinic resins such as polyethylene and polypropylene
  • fluororesins such as acrylic resins, ABS resins, MS resins, styrene resins, and polyvinylidene fluoride are used.
  • An olefin resin, and more preferably a fluoroolefin resin such as an acrylic resin, an MS resin, a styrene resin, or polyvinylidene fluoride. These may be used alone or in combination of two or more.
  • Examples of the photocurable resin used for the binder 42 include a high molecular weight photocurable resin.
  • the high molecular weight photocurable resin any known one can be used without particular limitation as long as a photopolymerizable group is introduced into the polymer skeleton.
  • Examples of such a polymer skeleton include a polyethylene skeleton, a polyurethane skeleton, a polyester skeleton, a polyamide skeleton, a polyimide skeleton, a polyoxyalkylene skeleton, and a polyphenylene skeleton, and a polyethylene skeleton and a polyurethane skeleton are preferable.
  • photopolymerizable group examples include (meth) acryloyl group, alkenyl group, cinnamoyl group, cinnamylideneacetyl group, benzalacetophenone group, styrylpyridine group, ⁇ -phenylmaleimide, phenylazide group, sulfonylazide group, carbonyl Azido group, diazo group, o-quinonediazide group, furylacryloyl group, coumarin group, pyrone group, anthracene group, benzophenone group, benzoin group, stilbene group, dithiocarbamate group, xanthate group, 1,2,3-thiadiazole group, cyclohexane A propene group azadioxabicyclo group and the like can be mentioned, and preferred photopolymerizable groups are a (meth) acryloyl group and a cinnamoyl group, and a (meth)
  • the ratio between the resin as the binder and the hollow particles can be appropriately adjusted according to the coating method, viscosity, etc. on the glass.
  • the following highly transmissive glass As the glass of the glass plate 30, for example, the following highly transmissive glass is used.
  • the following highly transmissive glass has a low absorption coefficient in the entire visible light wavelength range (380 to 780 nm), and the wavelength dependency of the absorption coefficient is appropriately designed as compared with the conventional glass. Therefore, when the following highly transmissive glass is used as the light guide plate, the luminance of light emitted from the main surface is high, and the in-plane chromaticity difference is kept small.
  • the wavelength dependence of the absorption coefficient refers to the difference in the absorption coefficient of light for each wavelength band of visible light.
  • the wavelength dependence of the absorption coefficient of the highly transmissive glass in the present invention is appropriately designed, and blue light is absorbed by the glass as it is guided, so the chromaticity of the emitted light is in-plane. It is uniform.
  • the high transmittance glass in the present invention is designed such that the blue absorption coefficient is slightly larger than the red absorption coefficient.
  • the blue absorption coefficient is not too large, and color unevenness due to glass absorption does not appear remarkably.
  • the main factor of light absorption of the glass plate is iron ions contained as impurities. Iron is unavoidably contained as a raw material for industrially produced glass, and it is inevitable that iron is mixed into the glass. Iron ions take the form of divalent (Fe 2+ ) and trivalent (Fe 3+ ) in the glass, but particularly problematic is Fe 2+ having a broad absorption at a wavelength of 490 to 780 nm. Fe 3+ has an absorption band at a wavelength of 380 to 490 nm, but its influence is small because the absorption coefficient per unit concentration is one digit smaller than that of Fe 2+ .
  • the iron content in the glass plate 30 and the ratio of divalent (Fe 2+ ) and trivalent (Fe 3+ ) must be appropriately adjusted so that the in-plane chromaticity difference can be kept small.
  • the color can be accurately reproduced near the light source because the light propagation distance is short, but as the distance from the light source increases, the influence of the wavelength dependence of scattering at the scattering portion increases. The color shifts.
  • the chromaticity difference is likely to occur as the liquid crystal television has a larger screen.
  • the highly transmissive glass is expressed in terms of mass percentage based on oxide, Fe 2 O 3 is 1 mass ppm to 50 mass ppm, NiO is 0.01 mass ppm to 2.0 mass ppm, and Cr 2 O 3 is 0.01 mass. It contains ppm to 2.0 mass ppm, 0.01 mass ppm to 50 mass ppm of MnO 2 , 0.01 mass ppm to 1000 mass ppm of TiO 2 , and iron redox is 25% or less.
  • the high transmission glass typically, the following three types (1) glass A, (2) glass B, and (3) glass C are mentioned.
  • the glass composition and refractive index are average values, “%” means mass%, and “ppm” means mass ppm.
  • Glass A is a mass percentage based on oxides, SiO 2 60 ⁇ 80%, the Al 2 O 3 0 ⁇ 7% , the MgO 0 ⁇ 10%, the CaO 0 ⁇ 20%, SrO 0-15 %, BaO 0-15%, Na 2 O 3-20%, K 2 O 0-10%, Fe 2 O 3 1 ppm-50 ppm, NiO 0.01 ppm-2.0 ppm, Cr 2 O 3 is 0.01 ppm to 2.0 ppm, MnO 2 is 0.01 ppm to 50 ppm, and TiO 2 is 0.01 ppm to 1000 ppm.
  • the iron redox of glass A is 25% or less.
  • the refractive index at room temperature of the helium d line (wavelength: 587.6 nm) of glass A is 1.45 to 1.60. Specific examples include, for example, Examples 1 to 4 and Example 15 in Table 1.
  • Glass B is expressed in terms of oxide-based mass percentage, and SiO 2 is 45 to 80%, Al 2 O 3 is more than 7% and 30% or less, B 2 O 3 is 0 to 15%, MgO is 0 to 15%, Fe 0-6%, SrO 0-5%, BaO 0-5%, Na 2 O 7-20%, K 2 O 0-10%, ZrO 2 0-10%, Fe 2 O 3 is contained at 1 ppm to 50 ppm, NiO is contained at 0.01 ppm to 2.0 ppm, Cr 2 O 3 is contained at 0.01 ppm to 2.0 ppm, MnO 2 is contained at 0.01 ppm to 50 ppm, and TiO 2 is contained at 0.01 ppm to 1000 ppm.
  • the iron redox of glass B is 25% or less.
  • the refractive index at room temperature of the glass B helium d-line (wavelength 587.6 nm) is, for example, 1.45 to 1.60.
  • Glass B is easy to ion exchange and easy to chemically strengthen. Specific examples include, for example, Examples 5 to 11 in Table 1.
  • Glass C is expressed in terms of mass percentage based on oxide, and the total amount of SiO 2 is 45 to 70%, Al 2 O 3 is 10 to 30%, B 2 O 3 is 0 to 15%, MgO, CaO, SrO, and BaO. 5 to 30%, Li 2 O, Na 2 O and K 2 O in total of 0% or more and less than 3%, Fe 2 O 3 1 to 50 ppm, NiO 0.01 ppm to 2.0 ppm, Cr 2 O 3 is contained at 0.01 ppm to 2.0 ppm, MnO 2 is contained at 0.01 ppm to 50 ppm, and TiO 2 is contained at 0.01 ppm to 1000 ppm.
  • the iron redox of glass C is 25% or less.
  • the refractive index at room temperature of the helium d-line (wavelength 587.6 nm) of glass C is, for example, 1.45 to 1.60. Specific examples include Examples 12 to 14 in Table 1.
  • SiO 2 is a main component of glass.
  • the content of SiO 2 is preferably 60% or more, more preferably 63% or more in the glass A in terms of oxide-based mass percentage, and the glass B Is preferably 45% or more, more preferably 50% or more.
  • the glass C it is preferably 45% or more, more preferably 50% or more.
  • the content of SiO 2 is easy to dissolve and the foam quality is good, and the content of divalent iron (Fe 2+ ) in the glass is kept low, and the optical properties are good. Therefore, in glass A, it is preferably 80% or less, more preferably 75% or less, in glass B, preferably 80% or less, more preferably 70% or less, and in glass C, preferably 70% or less, more preferably 65% or less.
  • Al 2 O 3 is an essential component for improving the weather resistance of the glass B and C.
  • the content of Al 2 O 3 is preferably 0% or more, more preferably 2% or more.
  • the content is preferably more than 7%, more preferably 10% or more.
  • the content of Al 2 O 3 is preferably in the glass A. 7% or less, more preferably 5% or less, in glass B, preferably 30% or less, more preferably 23% or less, and in glass C, preferably 30% or less, more preferably 20% or less. It is.
  • B 2 O 3 is a component that promotes melting of the glass raw material and improves mechanical properties and weather resistance, but it does not cause inconveniences such as generation of striae due to volatilization and furnace wall erosion.
  • the content of B 2 O 3 is in the glass a is preferably not more than 5%, more preferably not more than 3%, in the glass B and C, preferably 15% or less, more preferably 12% or less It is.
  • Alkali metal oxides such as Li 2 O, Na 2 O, and K 2 O are useful components for accelerating melting of glass raw materials and adjusting thermal expansion, viscosity, and the like. Therefore, in the glass A, the content of Na 2 O is preferably 3% or more, more preferably 8% or more. In the glass B, the content of Na 2 O is preferably 7% or more, more preferably 10% or more. However, the content of Na 2 O is preferably 20% or less in the glasses A and B in order to maintain the clarity during melting and maintain the foam quality of the produced glass, and 15% or less. More preferably, in glass C, it is preferably less than 3%, more preferably 1% or less.
  • the content of K 2 O is preferably 10% or less, more preferably 7% or less in the glasses A and B, and preferably 2% or less, more preferably 1% in the glass C. It is as follows. Further, Li 2 O is an optional component, to facilitate vitrification, raw materials kept low iron content as impurity derived, in order to reduce the batch cost, glass A, B and C, Li 2 O can be contained at 2% or less. In addition, the total content of these alkali metal oxides (Li 2 O + Na 2 O + K 2 O) maintains the clarification at the time of melting, and in order to maintain the foam quality of the glass produced, in the glasses A and B, Preferably, it is 5% to 20%, more preferably 8% to 15%. In the glass C, it is preferably 0% to less than 3%, more preferably 0% to 1%.
  • Alkaline earth metal oxides such as MgO, CaO, SrO, and BaO are useful components for accelerating melting of glass raw materials and adjusting thermal expansion, viscosity, and the like.
  • MgO has the effect of lowering the viscosity during glass melting and promoting the melting.
  • action which reduces specific gravity and makes a glass plate hard to wrinkle, it can be contained in glass A, B, and C.
  • the content of MgO is preferably 10% or less, more preferably 8% or less in the glass A, In the glass B, it is preferably 15% or less, more preferably 12% or less, and in the glass C, it is preferably 10% or less, more preferably 5% or less.
  • CaO is a component that promotes melting of the glass raw material and adjusts viscosity, thermal expansion, and the like, and therefore can be contained in the glasses A, B, and C.
  • the content of CaO is preferably 3% or more, more preferably 5% or more.
  • the glass A is preferably 20% or less, more preferably 10% or less, and the glass B is preferably 6% or less, more preferably 4%. It is as follows.
  • SrO has the effect of increasing the thermal expansion coefficient and lowering the high temperature viscosity of the glass.
  • SrO can be contained in the glasses A, B and C.
  • it is preferably 15% or less in the glass A and C, more preferably 10% or less, and in the glass B, 5% or less.
  • it is more preferably 3% or less.
  • BaO like SrO, has the effect of increasing the coefficient of thermal expansion and lowering the high temperature viscosity of the glass.
  • BaO can be contained in glass A, B, and C.
  • FIG. in order to keep the thermal expansion coefficient of the glass low, it is preferably 15% or less in the glass A and C, more preferably 10% or less, and in the glass B, 5% or less. Preferably, it is more preferably 3% or less.
  • the total content of these alkaline earth metal oxides is preferably 10% in the glass A in order to keep the coefficient of thermal expansion low, good devitrification properties and maintain strength. 30%, more preferably 13% to 27%, in glass B, preferably 1% to 15%, more preferably 3% to 10%, and in glass C, preferably 5% to 30%. %, More preferably 10% to 20%.
  • Glasses A, B, and C may contain 10% or less, preferably 5% or less, of ZrO 2 as an optional component in order to improve the heat resistance and surface hardness of the glass. If ZrO 2 is 10% or less, it is preferable because the glass is hardly devitrified.
  • Glasses A, B and C contain 1 ppm to 50 ppm of Fe 2 O 3 from the viewpoint of improving the solubility of the glass.
  • the amount of Fe 2 O 3 refers to the total iron oxide amount in terms of Fe 2 O 3.
  • the total iron oxide content is preferably 1 ppm to 50 ppm, more preferably 1 ppm to 25 ppm, still more preferably 1 ppm to 20 ppm, and particularly preferably 1 ppm to 15 ppm. If the total iron oxide content is 1 ppm or more, the infrared absorption of the glass becomes appropriate, so that the solubility can be improved, and the cost of refining the raw material does not increase. Moreover, if the total iron oxide amount is 50 ppm or less, coloring of the glass is suppressed, and appropriate visible light transmittance can be secured, and color unevenness can be suppressed.
  • the proportion of divalent iron in the total iron is represented by iron redox.
  • Iron redox the mass of the bivalent iron terms of Fe 2 O 3 shows the rate at percentage relative to the mass of total iron as calculated as Fe 2 O 3.
  • Total iron is the sum of divalent iron and trivalent iron. The amounts and ratios of divalent iron and trivalent iron are obtained by spectrophotometric determination using bathophenanthroline. The smaller the iron redox, the smaller the proportion of divalent iron in the total iron. Since divalent iron has a larger absorption coefficient than trivalent iron, it is preferable that the iron redox is smaller from the viewpoint of suppressing color unevenness due to absorption of the glass plate.
  • the iron redox is 25% or less. More preferably, it is 20% or less, and more preferably 15% or less. Iron redox is preferably 3% or more, more preferably 5% or more, and even more preferably 8% or more in consideration of productivity and cost.
  • the glass A, B and C may contain SO 3 as a fining agent.
  • the SO 3 content is preferably more than 0% and 0.5% or less in terms of mass percentage. 0.4% or less is more preferable, 0.3% or less is more preferable, and 0.25% or less is further preferable.
  • the glass A, B and C may contain one or more of Sb 2 O 3, SnO 2 and As 2 O 3 as an oxidizing agent and a clarifying agent.
  • the content of Sb 2 O 3 , SnO 2 or As 2 O 3 is preferably 0 to 0.5% in terms of mass percentage. 0.2% or less is more preferable, 0.1% or less is more preferable, and it is further more preferable not to contain substantially.
  • Sb 2 O 3 , SnO 2 and As 2 O 3 act as an oxidizing agent for glass, they may be added within the above range depending on the purpose of adjusting the amount of Fe 2+ in the glass.
  • As 2 O 3 is not positively contained from the environmental viewpoint.
  • Glasses A, B, and C contain NiO.
  • the content of NiO is 0.01 ppm or more and 2.0 ppm or less with respect to the total amount of the glass composition described above in order to suppress color unevenness in the plane of the light guide plate. Since NiO has absorption in the near infrared region with a wavelength of 800 to 1100 nm, it improves the heat ray absorption efficiency of the glass melt when melting the glass. Therefore, by setting the content of NiO to 0.01 ppm or more, the solubility of the glass can be improved even if the amount of Fe 2 O 3 in the glass is small.
  • the content of NiO is preferably 0.01 ppm or more and 1.0 ppm or less from the viewpoint of suppressing color unevenness due to absorption of the glass plate. More preferably, the content is 0.01 ppm or more and 0.5 ppm or less, and further preferably 0.01 ppm or more and 0.4 ppm or less.
  • Glasses A, B and C contain Cr 2 O 3 .
  • the content of Cr 2 O 3 is 0.01 ppm or more and 2.0 ppm or less with respect to the total amount of the glass composition described above in order to suppress color unevenness in the plane of the light guide plate. Since Cr 2 O 3 acts as an oxidizing agent, iron redox can be controlled by setting the content of Cr 2 O 3 to 0.01 ppm or more. Since Cr 2 O 3 has strong absorption near wavelengths of 450 nm and 650 nm, the content of Cr 2 O 3 is 0.01 ppm or more and 1.0 ppm or less from the viewpoint of suppressing color unevenness due to absorption of the glass plate. It is preferable to set it as 0.01 ppm or more and 0.5 ppm or less, and it is more preferable to set it as 0.01 ppm or more and 0.4 ppm or less.
  • Glasses A, B and C contain MnO 2 .
  • the content of MnO 2 is 0.01 ppm or more and 50 ppm or less with respect to the total amount of the glass composition described above in order to suppress color unevenness in the plane of the light guide plate.
  • MnO 2 is to act as an oxidizing agent, by a more than 0.01ppm content of MnO 2, can be controlled iron redox.
  • the content of MnO 2 is preferably 0.01 ppm or more and 10 ppm or less, more preferably 0.01 ppm or more and 5 ppm or less.
  • it is 0.01 ppm or more and 2 ppm or less.
  • Glass A, B and C contains TiO 2.
  • the content of TiO 2 is 0.01 ppm or more and 1000 ppm or less with respect to the total amount of the glass composition described above. Since the foam breaking property is improved by adding TiO 2 , the foam defect in the glass can be reduced by setting the content of TiO 2 to 0.01 ppm or more.
  • the content of TiO 2 is preferably 0.01 ppm to 500 ppm, more preferably 0.01 ppm to 100 ppm. preferable.
  • Glass A, B and C may include CeO 2.
  • CeO 2 has the effect of lowering iron redox, and can reduce the absorption coefficient of glass at a wavelength of 400 to 700 nm.
  • the CeO 2 content is preferably 1000 ppm or less with respect to the total amount of the glass composition described above. A CeO 2 content of 1000 ppm or less is preferred because it does not absorb visible light too much and the iron redox can be maintained at 3% or more.
  • the CeO 2 content is more preferably 500 ppm or less, further preferably 400 ppm or less, particularly preferably 300 ppm or less, and most preferably 200 ppm or less.
  • Glasses A, B and C may contain at least one component selected from the group consisting of CoO, V 2 O 5 and CuO. When these components are contained, they also function as components that absorb visible light, and therefore the content of the components is preferably 10 ppm or less with respect to the total amount of the glass composition described above. In particular, it is preferable that these components are not substantially contained so as not to lower the internal transmittance of the glass plate at a wavelength of 400 to 700 nm.
  • incident light from the light source 50 is scattered in the individual light scattering portions 40 while being absorbed in the glass plate 30 and propagates in the glass plate 30.
  • the wavelength dependency of the scattering efficiency is reduced by the wavelength dependency of the absorption coefficient by using a predetermined high transmittance glass as the glass of the glass plate 30.
  • variation of chromaticity according to the distance from the light source 50 can be suppressed.
  • the glass plate 30 has a substantially rectangular shape in plan view and has a length of 482 mm or more in a direction from the end surface where light enters to the end surface facing the end surface.
  • a light reflection layer may be disposed on the light incident surface 32 of the glass plate 30.
  • the light reflecting layer for example, a laminated structure of a base material and an adhesive layer such as a reflecting tape can be used.
  • the thickness of the light reflecting layer is not particularly limited, for example, a thickness of 0.01 to 0.75 mm can be applied, and from the viewpoint of workability, 0.20 to 0.50 mm is preferable.
  • the base material is a resin film such as an acrylic resin, a polyester resin such as polyethylene terephthalate (PET) resin, a urethane resin, and a material formed by combining them.
  • the resin film may include a light reflecting member on at least one surface.
  • the light reflecting member is a metal deposited layer such as aluminum or silver.
  • the base material is white PET containing titanium oxide, it is preferable because it is a light reflecting member itself.
  • a white film E6SR Lumirror made by Toray Industries, Inc.
  • a highly reflective film Ruil mirror made by Reiko
  • Tetron film UX series made by Teijin Ltd.
  • the adhesive layer is made of, for example, acrylic resin, silicone resin, urethane resin, synthetic rubber, or the like.
  • the adhesive layer may be on the front or back surface of the substrate.
  • the substrate is a resin film including a light reflecting member, the surface on which the adhesive layer is disposed can be selected depending on a balance such as scratch prevention and optical property deterioration prevention.
  • a coating layer containing highly reflective ink, mirror ink or the like can be used.
  • screen printing ink MIR-51000 mirror silver manufactured by Teikoku Ink Co., Ltd.
  • the coating layer can be disposed on the light incident surface by a known printing method or the like.
  • the diffuse reflectance of the light reflecting layer is preferably 80% or more, particularly preferably 90% or more from the viewpoint of reducing color unevenness. Although the details of the mechanism of color unevenness reduction by the light reflecting layer are not clarified, it is considered that the interaction between the incident light and the light reflected again in the light guide plate has an influence.
  • the diffuse reflectance in the present invention is a diffuse reflectance including specular reflection, and can be measured using a spectrophotometer (for example, Shimadzu Corporation, trade name: SolidSpec-3700) and an integrating sphere.
  • a spectrophotometer for example, Shimadzu Corporation, trade name: SolidSpec-3700
  • the light reflecting layer reflects the light that has propagated through the inside of the glass plate and reached the incident light face again toward the inside of the glass plate, which is effective for further improving the luminance and reducing the color unevenness as the light guide plate.
  • Test examples 1 to 4 are examples, and test example 5 is a comparative example.
  • Test Example 1 a glass light guide plate was produced by printing a diffusion ink in a dot pattern on one main surface of a glass plate and curing it by irradiation with ultraviolet rays.
  • the glass of the glass plate the glass of Example 15 shown in Table 1 was used.
  • the glass plate was substantially rectangular in plan view and had a diagonal length of 1396 mm (55 inches).
  • the dimensions of the glass plate were 1214 mm wide, 689 mm long, and 2.1 mm thick. Of the four end surfaces of the glass plate, the light incident surface was mirror-finished and the remaining three surfaces were roughed.
  • As the diffusion ink an ink containing ultraviolet curable hollow particles (manufactured by JSR, product number: SX8034) was used.
  • the produced glass light guide plate was replaced with the acrylic light guide plate of the backlight unit taken out from a ready-made liquid crystal display (manufactured by Sony Corporation, KD-55X8500B). Then, the light source of the backlight unit was turned on in the dark room, and the chromaticity variation of the light extracted from the light extraction surface of the glass light guide plate was measured. As a result of visual evaluation, variation in chromaticity was small.
  • FIG. 2 is a diagram showing measurement points of chromaticity of the glass light guide plate according to Test Example 1.
  • H is the horizontal dimension (1214 mm) of the glass plate 30
  • V is the vertical dimension (689 mm) of the glass plate 30.
  • the nine measurement points P1-1, P1-2, P1-3, P2-1, P2-2, P2-3, P3-1, P3-2, and P3-3 shown in FIG. Chromaticity coordinates x and y were measured.
  • a two-dimensional color luminance meter CA-2000 manufactured by Konica Minolta Co., Ltd. was used.
  • Test Example 2 a glass light guide plate was produced in the same manner as in Test Example 1 except that a reflective tape was attached to the end surface facing the light incident surface among the four end surfaces of the glass plate, and the chromaticity variation was measured.
  • a light-shielding polyester film adhesive tape manufactured by Teraoka Seisakusho, product number: 6371 0.06 black and white HF
  • the diffuse reflectance of the tape was 83%.
  • the diffuse reflectance was measured as a diffuse reflectance including specular reflection using a spectrophotometer (manufactured by Shimadzu Corporation, trade name: SolidSpec-3700) and an integrating sphere. As a result of visual evaluation, variation in chromaticity was small.
  • Test Example 3 In Test Example 3, a glass light guide plate was prepared and the variation in chromaticity was measured in the same manner as in Test Example 1, except that a highly reflective white ink (product number: GLS-HF CLEAR) was used as the diffusion ink. did. This highly reflective white ink contained solid silica particles and a binder. As a result of visual evaluation, variation in chromaticity was small.
  • a highly reflective white ink product number: GLS-HF CLEAR
  • Test Example 4 a glass light guide plate was produced in the same manner as in Test Example 3 except that a reflective tape was attached to the end surface facing the light incident surface among the four end surfaces of the glass plate, and the chromaticity variation was measured. In addition, as a reflective tape, the same thing as Test Example 2 was used. As a result of visual evaluation, variation in chromaticity was small.
  • Test Example 5 chromaticity variation was evaluated in the same manner as in Test Example 1 except that conventional high-transmission glass (manufactured by Asahi Glass Co., Ltd., trade name: JFL) was used as the glass.
  • conventional high-transmission glass manufactured by Asahi Glass Co., Ltd., trade name: JFL
  • the glass used was a SiO 2 70.7%, Al 2 O 3 1.9% of CaO 8.1% of MgO 4.9% 12.5% the Na 2 O, K 1.5% 2 O, SO 3 and 0.3%, 80 ppm of Fe 2 O 3, 1.6ppm of NiO, 2.9 ppm of Cr 2 O 3, the MnO 2 7.0 ppm, 100 ppm containing TiO 2 And iron redox is 51%.
  • “%” means mass%
  • ppm means mass ppm.
  • ⁇ x is the chromaticity coordinates at nine measurement points P1-1, P1-2, P1-3, P2-1, P2-2, P2-3, P3-1, P3-2, and P3-3.
  • the magnitude of the difference between the maximum value and the minimum value of x, ⁇ y is nine measurement points P1-1, P1-2, P1-3, P2-1, P2-2, P2-3, P3-1, P3- 2 represents the difference between the maximum value and the minimum value of the chromaticity coordinates y in P3-3.
  • Test Example 1 and Test Example 2 since a predetermined highly transmissive glass is used as the glass of the glass plate and the light scattering part includes hollow particles, the variation in chromaticity is ⁇ y ⁇ 0. It was smaller than 030.
  • the scattering material containing hollow particles is applied to the light scattering portion of the glass plate of the present invention, it is shown that color unevenness can be further suppressed.
  • Test Example 2 since the light reflecting layer is disposed on the light incident surface, it is considered that the variation in chromaticity is smaller than that in Test Example 1.
  • Table 3 shows that the measurement points are 9 points at equal intervals in the vertical direction and 3 points in the horizontal direction (see FIG. 3), and the chromaticity coordinates y are obtained. In other positions P12 to P19, the maximum value of y is shown.
  • ⁇ y represents the magnitude of the difference between the minimum value of y at the position P11 closest to the light incident surface and the maximum value of y at each of the other positions P12 to P19. Then, a vertical dimension satisfying the above-described range suitable for chromaticity variation, ⁇ y ⁇ 0.030, was obtained.
  • the glass plate of the example of the present invention is 55 inches in size.
  • Test example 3 and test example 4 satisfy the standard if the longitudinal dimension is 482 mm or less, but if it exceeds 482 mm, ⁇ y ⁇ 0.030 is not satisfied, whereas test example 1 and test example 2 are at all measurement points. It meets the criteria. That is, it is shown that a glass plate having a longitudinal dimension of 482 mm can satisfy ⁇ y ⁇ 0.030 if the highly transmissive glass in the present invention is used.
  • the size of the glass plate 30 is assumed to be 690 mm ⁇ 100 mm, and the plate thickness is assumed to be 2.1 mm.
  • a plurality of LED light sources are arranged so as to face the side of 100 mm, and light is guided in the direction of the long side (side of 690 mm).
  • a reflective sheet was disposed so as to face the second main surface 36 of the glass plate 30.
  • a plurality of light scattering portions 40 are provided on the second main surface 36 so that light is emitted from the first main surface 35 with uniform luminance. By emitting a total of 10 million rays from the LED light source and tracking them, the distribution of chromaticity of the light emitted from the first main surface 35 was analyzed.
  • the light scattering portion 40 contained 20 volume% solid particles or 20 volume% hollow particles.
  • solid particles silica particles were assumed, the refractive index was 1.46, and the diameter was 2000 nm.
  • hollow particles polymer particles having a core-shell structure were assumed, and the refractive index of the hollow portion was 1.00 and the diameter was 300 nm.
  • the shell portion has a refractive index approximately equal to that of the surrounding binder, there is no problem even if only the hollow portion is modeled.
  • the refractive indexes of the glass plate 30 and the binder 42 were 1.52.
  • the glass plate 30 is a high transmission glass that does not contain any of Fe 2 O 3 , NiO, Cr 2 O 3 , MnO 2 , and TiO 2, and solid particles are used for the light scattering portion 40, the first main
  • the difference between the maximum value and the minimum value of the chromaticity coordinate y of the light emitted from the surface is 0.0093, and the chromaticity coordinate y increases as the distance from the light incident surface 31 increases.
  • the glass plate 30 Fe 2 O 3, NiO , Cr 2 O 3, the MnO 2, TiO 2 to set a high transmittance glass which does not contain any, in the case of using the hollow particles in the light scattering portion 40, the first main surface
  • the difference between the maximum value and the minimum value of the chromaticity coordinate y of the light emitted from the light source is 0.0057, and the chromaticity coordinate y decreases as the distance from the light incident surface 31 increases.
  • the glass plate 30 contains 19 ppm of Fe 2 O 3 , 0.19 ppm of NiO, 0.22 ppm of Cr 2 O 3 , 0.10 ppm of MnO 2 and 0.10 ppm of TiO 2 , and iron redox is 18.4%.
  • iron redox is 18.4%.
  • the glass plate 30 24 ppm of Fe 2 O 3, 0.19ppm to NiO, 0.22 ppm of Cr 2 O 3, the MnO 2 0.10 ppm, the TiO 2 containing 0.10 ppm, iron redox is 14.6%
  • the difference between the maximum value and the minimum value of the chromaticity coordinate y of the light emitted from the first main surface is 0.0006.
  • the chromaticity coordinate y was almost uniform throughout the surface.
  • the color change of the emitted light due to the wavelength dependence of the scattering is canceled by the absorption characteristics of the glass, This is more preferable because there is almost no color unevenness.
  • the liquid crystal display device of the above embodiment is a transmissive type, but may be a reflective type, and the light guide plate 20 may be disposed in front of the liquid crystal panel 10 (on the user side).
  • Light from the light source 50 enters inside from the end face of the light guide plate 20, exits from the main surface (rear face) of the light guide plate 20 facing the liquid crystal panel 10, and uniformly illuminates the liquid crystal panel 10 from the front.
  • the light source of the above embodiment is a white LED, it may be a fluorescent tube.
  • the kind of white LED is not specifically limited, For example, you may make fluorescent substance light-emit using ultraviolet LED with a wavelength shorter than blue LED instead of blue LED. Further, instead of the phosphor-type white LED, a three-color LED-type white LED may be used.

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Abstract

La solution consiste en une plaque de guidage de lumière caractérisée en ce qu'elle comporte une surface d'extrémité sur laquelle frappe de la lumière provenant d'une source de lumière, une première surface principale par laquelle est extraite la lumière qui a frappé la surface d'extrémité, et une plaque de verre ayant une seconde surface principale faisant face à la première surface principale, la plaque de verre comprenant du verre pour lequel la réaction rédox du fer est égale ou inférieure à 25 %, et contenant entre 1 et 50 ppm de Fe2O3, entre 0,01 et 2,0 ppm en masse de NiO, entre 0,01 et 2,0 ppm en masse de Cr2O3, entre 0,01 et 50 ppm en masse de MnO2 et entre 0,01 et 1 000 ppm en masse de TiO2, les quantités étant exprimées en termes de pourcentage en masse à base d'oxyde.
PCT/JP2016/089130 2016-01-06 2016-12-28 Plaque de guidage de lumière WO2017119399A1 (fr)

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EP3569577A1 (fr) 2018-05-18 2019-11-20 Schott Ag Verre plat, son procédé de fabrication et son utilisation
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CN112230308A (zh) * 2020-10-21 2021-01-15 河南安彩高科股份有限公司 一种显示用玻璃导光板及其制作方法
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JP2013140702A (ja) * 2011-12-30 2013-07-18 Toyota Tsusho Corp 光分配層及びそれを用いた導光装置
JP2015072896A (ja) * 2013-09-03 2015-04-16 日本電気硝子株式会社 導光板
WO2015068741A1 (fr) * 2013-11-08 2015-05-14 旭硝子株式会社 Plaque de verre, unité de panneau de guidage de lumière, dispositif d'émission de lumière planaire, et dispositif d'affichage à cristaux liquides

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Publication number Priority date Publication date Assignee Title
EP3569578A1 (fr) 2018-05-18 2019-11-20 Schott Ag Utilisation d'un verre plat dans des composants électroniques
EP3569577A1 (fr) 2018-05-18 2019-11-20 Schott Ag Verre plat, son procédé de fabrication et son utilisation
US11465929B2 (en) 2018-05-18 2022-10-11 Schott Ag Flat glass, method for producing same, and use thereof
WO2020004131A1 (fr) * 2018-06-27 2020-01-02 日本電気硝子株式会社 Procédé de production de stratifié de substrat de verre, substrat de verre, stratifié de substrat de verre et visiocasque
JPWO2020004131A1 (ja) * 2018-06-27 2021-08-05 日本電気硝子株式会社 ガラス基板積層体の製造方法、ガラス基板、ガラス基板積層体及びヘッドマウントディスプレイ
JP7228135B2 (ja) 2018-06-27 2023-02-24 日本電気硝子株式会社 ガラス基板積層体の製造方法、ガラス基板、ガラス基板積層体及びヘッドマウントディスプレイ
CN112230308A (zh) * 2020-10-21 2021-01-15 河南安彩高科股份有限公司 一种显示用玻璃导光板及其制作方法
DE202022104982U1 (de) 2022-09-05 2023-02-01 Schott Ag Nicht flaches Formglas

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