WO2018021279A1 - Feuille de verre - Google Patents

Feuille de verre Download PDF

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Publication number
WO2018021279A1
WO2018021279A1 PCT/JP2017/026810 JP2017026810W WO2018021279A1 WO 2018021279 A1 WO2018021279 A1 WO 2018021279A1 JP 2017026810 W JP2017026810 W JP 2017026810W WO 2018021279 A1 WO2018021279 A1 WO 2018021279A1
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WO
WIPO (PCT)
Prior art keywords
glass
light
less
content
phase
Prior art date
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PCT/JP2017/026810
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English (en)
Japanese (ja)
Inventor
和田　直哉
順子 宮坂
怡珊 賀
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旭硝子株式会社
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Publication of WO2018021279A1 publication Critical patent/WO2018021279A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to a glass plate used for a light diffusing plate used in a direct type or edge light type backlight unit (hereinafter abbreviated as a backlight) such as a liquid crystal television and a liquid crystal monitor.
  • a backlight a direct type or edge light type backlight unit
  • the light diffusing plate As a material for the light diffusing plate used for the backlight of liquid crystal televisions and liquid crystal monitors, a transparent material will transmit the light and the light source will be seen through, so the light source behind the light diffusing plate A material that does not impair the shape of the light source and does not impair the luminance of the light source is used.
  • the light source is a light emitting diode (LED) or the like.
  • a material of a light diffusing plate used for backlights such as liquid crystal televisions and liquid crystal monitors
  • a transparent material if a transparent material is used, uneven luminance of the light guide plate that emits light incident on the light diffusing plate can be seen.
  • a material that does not recognize uneven brightness of the light guide plate behind the light diffusion plate is used.
  • Patent Document 1 a material in which a polymer or inorganic particle having a refractive index different from that of a thermoplastic resin forming a continuous phase is mixed as a dispersed phase is used.
  • Patent Document 3 discloses a light diffusion plate made of a polycarbonate resin in which diffusivity, reflectance, and luminance unevenness are in specific ranges.
  • liquid crystal televisions, liquid crystal monitors, and the like have a tendency to increase in size, and light diffusing plates used for backlights are required to have high strength and uniform and high light diffusibility.
  • the light diffusing plate is required to have high strength, but the resin light diffusing plate has a problem of low rigidity and the strength of the outer frame must be increased.
  • the resin-made light diffusion plate has low heat resistance and light resistance, there is a problem that if the distance between the light source and the light diffusion plate is too close, the resin light diffusion plate is deformed with time.
  • the resin light diffusing plate has low water resistance, there is a problem that when it is stored for a long period of time, water that has entered from the periphery of the light diffusing plate absorbs water and swells and deforms.
  • the glass plate of the present invention has an average value of total light transmittance and a haze value in a specific range, and the glass plate has a specific range of divalent iron content converted to Fe 2 O 3. Since the value obtained by dividing the content of the divalent iron by the average value of the total light transmittance expressed as a percentage is controlled within a specific range, it has a uniform and high light diffusibility.
  • the glass plate of the present invention has high water resistance compared to a resin light diffusion plate, and when used in a backlight, it is difficult to swell and deform even when stored for a long period of time, and display unevenness. There is an advantage that it is difficult to occur.
  • FIG. 1 is a cross-sectional view of a direct type backlight using a light diffusing plate including the glass plate of the present invention.
  • FIG. 2 is a cross-sectional view of a model used for a backlight simulation using a light diffusing plate.
  • FIG. 3 is a perspective view of a model used for simulation of a backlight using a light diffusing plate.
  • FIG. 4 shows the light distribution characteristics after the LED light source is covered with a lens.
  • FIG. 5 shows an example of the result of the illuminance distribution.
  • FIG. 6 shows the relationship between the light emission efficiency, the content of divalent iron converted to Fe 2 O 3 , and the average value of the total light transmittance expressed as a percentage.
  • the glass plate of the present invention has a first main surface and a second main surface opposite to the first main surface.
  • the first main surface of the glass is a surface on the light source side when used in a direct type backlight.
  • the second main surface of the glass is a surface facing the first main surface, and is a surface on the liquid crystal panel side when used in a direct type backlight.
  • the lower the maximum temperature at the time of melting the glass raw material the more difficult it is for oxygen to escape from the molten glass, the molten glass is in an oxidized state, iron in the molten glass is oxidized, and converted to Fe 2 O 3 2 The content of valent iron is reduced.
  • the average value of the total light transmittance can be obtained from the following equation by measuring the total light transmittance Tt for each wavelength of 1 nm at a wavelength of 400 to 700 nm.
  • the wavelength of 400 nm to 700 nm is the emission wavelength range of a general visible light LED.
  • the visible LED may emit light at a wavelength of 380 nm to 400 nm or 700 nm to 800 nm.
  • the wavelength of 400 nm to 700 nm is used for calculating the average value of the total light transmittance. Is considered sufficient.
  • Glass phase separation means that a single-phase glass is divided into two or more glass phases.
  • Examples of the method for phase separation of glass include a method for heat-treating glass.
  • the heat treatment time is preferably 10 hours or less, more preferably 8 hours or less, further preferably 6 hours or less, further preferably 4 hours or less, particularly preferably 2 hours or less, and most preferably 1 hour or less. preferable.
  • the difference in refractive index between the two phases separated is preferably 0.02 or more, more preferably 0.04 or more, and still more preferably 0.1. That's it.
  • the difference in refractive index is preferably 0.3 or less, more preferably 0.25 or less, and further preferably 0.2 or less. It is.
  • the refractive index difference can be estimated by the Appen equation using EDX (energy dispersive X-ray fluorescence analyzer) or EPMA (electron probe X-ray microanalyzer) composition analysis results.
  • the phase-separated glass used in the present invention is a light-scattering particle (hereinafter also referred to as a light scatterer) that functions as a light scatterer in a phase-separated state inside the glass in order to reduce the wavelength dependence of the light scattering property.
  • the average particle diameter is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, and still more preferably 0.3 ⁇ m or more.
  • the average particle diameter of the said phase is 1.6 micrometers or less, More preferably, it is 1.0 micrometer or less, More preferably, it is 0.8 micrometer or less.
  • the average particle size of the phase can be measured by SEM observation.
  • the arithmetic average roughness Ra can be measured based on Japanese Industrial Standard JIS B0601 (1994).
  • the first main surface and the second main surface may have the same or different arithmetic average roughness Ra.
  • the content of MgO is more preferably 27% or less, further preferably 25% or less, particularly preferably 24% or less, and most preferably 18% or less.
  • P 2 O 5 is a basic component that promotes phase separation in combination with SiO 2 , MgO, and Na 2 O, it is included when the phase-separated glass is used for the glass plate in the light diffusion plate of the present invention. It is preferable.
  • the content of P 2 O 5 is preferably 0.5% or more, more preferably 1% or more, still more preferably 3% or more, and particularly preferably 4% or more. is there. Further, it is preferably 15% or less, more preferably 14% or less, further preferably 10% or less, particularly preferably 7% or less, and most preferably 4.5% or less.
  • the SiO 2 content is 66-72%
  • the Al 2 O 3 content is 0-4%
  • the MgO content is 16-24%
  • the Na 2 O content is 4-10%. It is preferable.
  • the SiO 2 content is 58% or more and less than 66%
  • the Al 2 O 3 content is 2 to 6%
  • the MgO content is 11 to 18%
  • the Na 2 O content is 8 to 13%.
  • the content of P 2 O 5 is preferably 3 to 7%.
  • the content of 2 O 5 is preferably 0.5 to 4.5%.
  • the phase-separated glass used in the present invention it may be preferable to contain the following components in addition to the five components. Even in this case, the total content of the five components is preferably 90% or more, and typically 94% or more.
  • ZrO 2 is not an essential component, but is preferably 4.5% or less, more preferably 4% or less, and even more preferably 3% or less in order to significantly improve chemical durability. By making the content of ZrO 2 4.5% or less, it is possible to prevent the light diffusion function from being lowered.
  • CaO, SrO, and BaO are not essential components, but in order to improve the light diffusion function, it is preferable to contain one or more of these components in an amount of 0.2% or more, more preferably 0.5% or more, and still more preferably Is 1% or more.
  • CaO When CaO is contained, its content is preferably 3% or less. By making the content of CaO 3% or less, the glass becomes difficult to devitrify.
  • the total content of CaO, SrO and BaO is preferably 12% or less, more preferably 8% or less, 6% or less, 4% or less, and typically 3% or less. By setting the total to 12% or less, the glass is hardly devitrified.
  • La 2 O 3 is suitable in terms of improving the light diffusion function of the glass, and can be contained in an amount of 0 to 5%, preferably 3% or less, more preferably 2% or less. By making the content of La 2 O 3 5% or less, the glass can be prevented from becoming brittle.
  • the phase separation glass used in the present invention 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 phase separation glass used in the present invention may contain NiO.
  • NiO functions also as a coloring component
  • the content of NiO is preferably 10 ppm or less in terms of mass percentage with respect to the total amount of the glass composition described above.
  • NiO is preferably 1.0 ppm or less, more preferably 0.5 ppm or less, from the viewpoint of suppressing a decrease in total light transmittance and obtaining uniform and high light diffusibility.
  • the phase separation glass used in the present invention may contain Cr 2 O 3 .
  • Cr 2 O 3 When Cr 2 O 3 is contained, Cr 2 O 3 also functions as a coloring component, so the content of Cr 2 O 3 is 10 ppm or less in terms of mass percentage with respect to the total amount of the glass composition described above. Is preferred.
  • Cr 2 O 3 is preferably 1.0 ppm or less, more preferably 0.5 ppm or less, from the viewpoint of suppressing a decrease in total light transmittance and obtaining uniform and high light diffusibility.
  • the phase separation glass used in the present invention may contain MnO 2 .
  • MnO 2 When MnO 2 is contained, MnO 2 also functions as a component that absorbs visible light. Therefore, the content of MnO 2 should be 50 ppm or less in terms of mass percentage with respect to the total amount of the glass composition described above. preferable. In particular, MnO 2 is preferably 10 ppm or less from the viewpoint of suppressing a decrease in total light transmittance and obtaining uniform and high light diffusibility.
  • the phase separation glass used in the present invention may contain TiO 2 .
  • TiO 2 When TiO 2 is contained, TiO 2 also functions as a component that absorbs visible light. Therefore, the content of TiO 2 should be 1000 ppm or less in terms of mass percentage with respect to the total amount of the glass composition described above. preferable.
  • the content of TiO 2 is more preferably 500 ppm or less, and particularly preferably 100 ppm or less, from the viewpoint of suppressing a decrease in total light transmittance and obtaining uniform and high light diffusibility.
  • Phase-separated glass to be used in the present invention may contain CeO 2.
  • CeO 2 has the effect of reducing the redox of iron and can reduce the absorption of glass at a wavelength of 400 to 700 nm.
  • the CeO 2 content is preferably 1000 ppm or less in terms of mass percentage with respect to the total amount of the glass composition described above.
  • 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 250 ppm or less.
  • the content of CeO 2 must be adjusted so that the content of divalent iron converted to Fe 2 O 3 is 1 mass ppm or more and 900 mass ppm or less.
  • the phase-separated glass used in the present invention 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 a component that absorbs visible light. Therefore, the content of the components is preferably 10 ppm or less in terms of mass percentage with respect to the total amount of the glass composition described above. In particular, these components are preferably not substantially contained in order to suppress a decrease in total light transmittance and to express uniform and high light diffusibility.
  • compositions (1) to (13) examples include the following compositions (1) to (13).
  • SiO 2 is 50 to 80%
  • Al 2 O 3 is 0 to 10%
  • MgO is 11 to 30%
  • Na 2 O is 0 to 15%
  • P 2 O 5 is expressed in terms of mole percentage based on oxide.
  • the total content of SrO and BaO is 1 to 20%, the total content of MgO, CaO, SrO and BaO is 6 to 25%, and the ratio of CaO content to RO is CaO / RO of 0.7 or less.
  • SiO 2 is 50 to 72%
  • B 2 O 3 is 0 to 8% and Al 2 O is expressed in terms of mole percentage based on oxide. 3 to 1 to 8%, MgO to 0 to 18%, CaO to 0 to 7%, SrO to 0 to 10%, BaO to 0 to 12%, ZrO 2 to 0 to 5%, Na 2 O to 5 to 15 %, P 2 O 5 2 to 10%
  • the total content of CaO, SrO and BaO is 1 to 20%
  • the total content of MgO, CaO, SrO and BaO is 6 to 25%
  • CaO Glass oxide standard with content / RO ratio CaO / RO of 0.7 or less SiO 2 is 50 to 70%
  • B 2 O 3 is 0 to 8%
  • Al 2 O 3 is 1 to 8%
  • MgO is 0 to 18%
  • CaO is 0 to 7%
  • SrO is 0 ⁇ 10%, BaO 0-12%, ZrO 2 0-5%, Na 2 O
  • the glass plate of the present invention preferably has a plate thickness of 0.3 mm or more, more preferably 0.5 mm or more, further preferably 0.75 mm or more, and 1.0 mm or more. Particularly preferred. 2 mm or less.
  • the plate thickness is preferably 2.0 mm or less, more preferably 1.8 mm or less, further preferably 1.7 mm or less, and 1.5 mm. It is more preferable that it is below, and it is especially preferable that it is 1.3 mm or less.
  • the glass plate used for the light diffusing plate of the present invention is preferably a rectangle having a dimension of at least one side of 200 mm or more, more preferably 400 mm or more, and further preferably 600 mm or more. Further, it is preferably 2500 mm or less, more preferably 2200 mm or less, further preferably 2000 mm or less, and particularly preferably 1800 mm or less.
  • a light diffusing plate utilizing the rigidity of the glass can be provided.
  • FIG. 1 shows a cross-sectional view of a direct type backlight constituted by a light diffusing plate using a glass plate of one embodiment of the present invention.
  • a direct type backlight 1 shown in FIG. 1 a light source 3 is provided on a reflecting plate 2 at a predetermined interval, and a light diffusing plate 4 is provided thereon. The light emitted from the light source 3 is diffused by the light diffusion plate 4.
  • a light diffusing sheet 5 On the light diffusing plate 4, a light diffusing sheet 5, a prism sheet 6, and a polarization separating sheet 7 are provided in this order.
  • an electromagnetic wave shielding sheet for shielding electromagnetic waves emitted from the light source may be provided between the light diffusion plate 4 and the light diffusion sheet 5.
  • the glass plate of the present invention can exhibit the function of a light diffusion sheet by coating particles having a particle diameter of 100 nm or more, porous silica, or the like.
  • the glass plate of the present invention has the function of the light diffusion sheet 5
  • the light diffusion sheet 5 can be omitted.
  • Glass materials were appropriately selected so as to have the composition shown in Table 5, and were melted, homogenized, and defoamed at 1650 ° C. After cooling to the phase separation treatment temperature at a cooling rate of 50 ° C. per minute, held at the phase separation treatment temperature shown in Table 5 for 30 minutes, poured into a mold material, and held for 1 hour at a temperature 30 ° C. higher than the glass transition temperature And cooled to room temperature at a cooling rate of 1 ° C. per minute. The glass was phase-separated by SEM, and the average particle diameter and volume fraction of the light scattering particles, which are light scatterers, were determined. The refractive index was estimated by the Appen equation using the result of composition analysis by EPMA.
  • FIG. 2 is a sectional view of the model
  • FIG. 3 is a perspective view of the model.
  • an LED light source 22 having a vertical and horizontal size of 3 mm and a height of 1 mm is arranged in the center of a 200 mm square square reflection sheet 21, and its upper surface emits light.
  • the light emission was Lambertian, and the LED light source 22 was covered with a lens 23 so that a wider area was brightly illuminated.
  • the light distribution characteristics after the LED light source 22 was covered with the lens 23 had maximum intensity at -70 degrees and around 70 degrees.
  • 0 degrees is the front of the LED light source 22.
  • the LED light source 22 and the lens 23 have general characteristics widely used in backlights.
  • the light diffusing plate 24 was disposed at a distance of 20 mm from the upper surface of the LED light source 22, and the reflecting sheet 21 was disposed around the light diffusing plate 24. When viewed from directly above, the LED light source 22 is located in the center of the light diffusion plate 24.
  • the light diffusing plate 24 has a square shape of 200 mm in length and width, and the thickness can be changed by setting.
  • the refractive index of the matrix of the light diffusion plate 24 is fixed at 1.51 in Examples 1 to 4 and 9 to 45, and fixed to 1.55 in Examples 5 to 8, but the present invention is limited as such. is not. Further, the degree of absorption of the light diffusing plate 24 is defined by the absorbance per 50 mm of the optical path length, and can be changed by setting.
  • Tables 1 to 4 show the results of obtaining the total luminous flux emitted upward from the light diffusion plate 24 and calculating the ratio to the total luminous flux emitted from the LED light source 22 as the light emission efficiency.
  • Examples 2 to 6, 9 to 18, 20 to 25, and 28 to 40 are examples, and Examples 1, 7, 8, 19, 26, and 27 are comparative examples.
  • Example 1 is a glass having no diffusion performance and is a comparative example. As shown in Table 1, in all the examples, the haze is 80% or more and the average value of the total light transmittance is 80% or less, so that the full width at half maximum and the 1 / e 2 diameter are diffusion performance. It was a large value compared with the glass (Example 1) which is not equipped with, and showed the preferable result.
  • the content of divalent iron in terms of Fe 2 O 3 is not more than 900 mass ppm, and a divalent iron in terms of Fe 2 O 3
  • the light emission efficiency was 0.85 or more because the value obtained by dividing the content (mass ppm) by the average value of the total light transmittance by the value expressed as a percentage was 30 or less.
  • Examples 42 to 45 in Table 6 show examples in which phase-separated glass was prepared in the same manner as in Test Example 1, and the upper and lower surfaces of the light diffusion plate 24 were blasted and then roughened by acid etching.
  • Example 41 is an example in which the upper and lower surfaces of the light diffusion plate 24 are not roughened. The evaluation method was the same as in Test Example 1.
  • the light diffusing plate 45 of Examples 42 to 45 had a larger full width at half maximum and 1 / e 2 diameter than those in the case of no scattering (Example 41), and showed preferable results.

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  • Engineering & Computer Science (AREA)
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Abstract

Le but de la présente invention est de fournir une feuille de verre qui possède une résistance élevée et des propriétés de diffusion de la lumière uniformes et élevées, et est appropriée pour obtenir de grandes feuilles minces dotées d'ouvertures étroites. La présente invention concerne une feuille de verre comportant une première surface principale et une seconde surface principale faisant face à la première surface principale, la feuille de verre étant caractérisée en ce que : la diffusion globale, qui est la transmittance de lumière totale moyenne à une longueur d'onde de 400 à 700 nm pour la lumière incidente entrant dans une direction perpendiculaire à la première surface principale et traversant la seconde surface principale, se situe dans une plage spécifique ; la feuille de verre est constituée d'un verre à phases séparées dans lequel la teneur en fer divalent, convertie en teneur de Fe2O3, se situe dans une plage spécifique ; et une valeur obtenue en divisant la teneur (en ppm en masse) en fer divalent, convertie en teneur de Fe2O3, par la valeur en pourcentage du facteur de transmission de la lumière totale moyenne à une longueur d'onde de 400 à 700 nm pour la lumière incidente passant à travers le verre à phases séparées, se situe dans une plage spécifique.
PCT/JP2017/026810 2016-07-29 2017-07-25 Feuille de verre WO2018021279A1 (fr)

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JP2016-150281 2016-07-29
JP2016150281 2016-07-29

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0446037A (ja) * 1990-06-13 1992-02-17 Central Glass Co Ltd ポーラスガラス用組成物
JP2007102195A (ja) * 2005-09-09 2007-04-19 Nippon Electric Glass Co Ltd 光拡散性組成物
JP2015164887A (ja) * 2013-09-03 2015-09-17 日本電気硝子株式会社 ガラス
WO2015186584A1 (fr) * 2014-06-02 2015-12-10 日本電気硝子株式会社 Verre à séparation de phases, procédé de fabrication de verre à séparation de phases et substrat composite utilisant un verre à séparation de phases
JP2016064970A (ja) * 2014-06-02 2016-04-28 日本電気硝子株式会社 分相ガラス
WO2016195015A1 (fr) * 2015-06-02 2016-12-08 旭硝子株式会社 Plaque de diffusion de lumière

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0446037A (ja) * 1990-06-13 1992-02-17 Central Glass Co Ltd ポーラスガラス用組成物
JP2007102195A (ja) * 2005-09-09 2007-04-19 Nippon Electric Glass Co Ltd 光拡散性組成物
JP2015164887A (ja) * 2013-09-03 2015-09-17 日本電気硝子株式会社 ガラス
WO2015186584A1 (fr) * 2014-06-02 2015-12-10 日本電気硝子株式会社 Verre à séparation de phases, procédé de fabrication de verre à séparation de phases et substrat composite utilisant un verre à séparation de phases
JP2016064970A (ja) * 2014-06-02 2016-04-28 日本電気硝子株式会社 分相ガラス
WO2016195015A1 (fr) * 2015-06-02 2016-12-08 旭硝子株式会社 Plaque de diffusion de lumière

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