WO2016173108A1 - 一种色度坐标和色域范围可调的荧光薄膜 - Google Patents

一种色度坐标和色域范围可调的荧光薄膜 Download PDF

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Publication number
WO2016173108A1
WO2016173108A1 PCT/CN2015/082143 CN2015082143W WO2016173108A1 WO 2016173108 A1 WO2016173108 A1 WO 2016173108A1 CN 2015082143 W CN2015082143 W CN 2015082143W WO 2016173108 A1 WO2016173108 A1 WO 2016173108A1
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Prior art keywords
fluorescent film
phosphor
weight
adhesive
parts
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PCT/CN2015/082143
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English (en)
French (fr)
Inventor
李轮
唐海江
马子盈
李刚
张彦
Original Assignee
宁波江北激智新材料有限公司
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Application filed by 宁波江北激智新材料有限公司 filed Critical 宁波江北激智新材料有限公司
Priority to KR1020157031893A priority Critical patent/KR101775260B1/ko
Priority to US14/937,611 priority patent/US9964685B2/en
Priority to EP15197834.3A priority patent/EP3088945B1/en
Priority to ES15197834.3T priority patent/ES2650874T3/es
Priority to PL15197834T priority patent/PL3088945T3/pl
Publication of WO2016173108A1 publication Critical patent/WO2016173108A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/206—Filters comprising particles embedded in a solid matrix

Definitions

  • the invention relates to the field of thin film display technology, in particular to a fluorescent film with adjustable chromaticity coordinates and color gamut.
  • the present invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut.
  • the fluorescent film can be applied not only to the backlight display technology but also to the field of illumination.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and a color gamut, the fluorescent film comprising a transparent substrate layer and an adhesive layer; the adhesive layer is bonded on the surface of the transparent substrate layer;
  • the adhesive layer includes an adhesive and a phosphor; the phosphor is dispersed in the adhesive.
  • the adhesive layer can be simply referred to as a glue layer.
  • the adhesive layer is bonded to one surface of the transparent substrate layer.
  • the phosphor is uniformly dispersed in the adhesive.
  • the material of the transparent substrate layer is selected from the group consisting of polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC), and polyamide resin (PA).
  • PET polyethylene terephthalate
  • PMMA polymethyl methacrylate
  • PC polycarbonate
  • PA polyamide resin
  • PS polystyrene
  • PE polyethylene
  • the transparent substrate has a thickness of 25 to 250 ⁇ m.
  • the adhesive is selected from one or at least one of an acrylic resin, a polyurethane resin, an epoxy resin, a polystyrene resin, an acrylic modified polyurethane, an acrylic modified organosiloxane resin, and an organosiloxane resin. a mixture of two.
  • the adhesive forms an adhesive layer after curing.
  • the adhesive layer formed by curing with an adhesive has a thickness of 5 to 75 ⁇ m.
  • the phosphor is selected from the group consisting of aluminates, silicates, nitrides, oxynitrides, borates, vanadates, alkaline earth metal sulfides, molybdates, tungstates, borophosphates, chlorine One or a combination of at least two of borate, phosphate, chlorosilicate, vanadium phosphate, and zinc oxide systems.
  • the phosphor may also be selected from one or a combination of at least two different products under any of the foregoing systems.
  • the adhesive layer further comprises diffusion beads, and the diffusion beads are dispersed in the adhesive. Further, the diffusion beads are uniformly dispersed in the adhesive.
  • the adhesive is 100 parts by weight, and the phosphor is 1-250 parts by weight.
  • the chromaticity coordinates of the fluorescent film are controlled by changing the amount of the phosphor added or in the mixed phosphor by adjusting the addition amount of the different phosphors or the relative addition ratio thereof.
  • Mixed phosphors are compositions of different phosphors.
  • the color gamut range of the fluorescent film is adjusted by changing the type of phosphor added or by mixing different phosphors.
  • the NTSC color gamut of the fluorescent film ranges from ⁇ 70%, up to 110%.
  • the adhesive layer further comprises uniformly dispersed diffusion beads.
  • Diffusion microbead Selected from silica, titania, alumina, barium sulfate, barium titanate, glass beads (ie, reflective powder), calcium carbonate, polymethyl methacrylate (PMMA), polystyrene (PS), propylene One or a combination of at least two of nitrile-butadiene-styrene copolymer (ABS), polyurethane (PU), and silicone polymer.
  • the diffusion beads have a particle diameter of 0.2 to 50 ⁇ m.
  • the adhesive is 100 parts by weight, and the diffusion microbeads are 0 to 250 parts by weight.
  • the adhesive is 100 parts by weight
  • the phosphor is 20-100 parts by weight
  • the diffusion beads are 5-50 parts by weight.
  • the material of the phosphor is preferably one of or a combination of at least two of an aluminate, a silicate, a nitride, and an oxynitride.
  • the material of the diffusion microbeads is preferably one or a combination of at least two of silica, titania, barium sulfate and PMMA, and the particle size of the diffusion beads is preferably from 0.3 to 30 ⁇ m.
  • the phosphor has a particle diameter of 0.2 to 50 ⁇ m.
  • the adhesive has a weight fraction of 100, and the phosphor has a weight fraction of 20-50, and the diffusion micro is The parts by weight of the beads are 5-25.
  • the phosphor is made of an aluminate or a nitride, and the phosphor has a particle diameter of 5 to 25 ⁇ m.
  • the material of the diffusion microbead is titanium dioxide or barium sulfate, and the particle diameter of the diffusion microbead is preferably 10-30 ⁇ m.
  • the adhesive layer has a thickness of 10 to 35 ⁇ m.
  • the transparent substrate was a PET sheet having a thickness of 100 ⁇ m.
  • the phosphor comprises a red phosphor (material is nitride) and a green phosphor (material is aluminate).
  • the fluorescent film in order to continue to expand the optical function and further reduce the amount of film used in the backlight module, the fluorescent film may also be coated with a protective coating or a prismatic structural layer. That is, the fluorescent film further includes a protective coating layer or a prismatic structural layer disposed on the other surface of the transparent substrate layer (the opposite side of the adhesive layer).
  • the surface of the protective coating has irregular protrusions.
  • the protective coating has a thickness of 2-15 ⁇ m.
  • the prism structure is composed of one of a prism strip or a microlens.
  • the cross section of the prism strip (viewed from the side of the membrane side) is triangular with an apex angle of 50°-130°.
  • the top end of the prism strip has a sharp angle or a circular arc shape (ie, an R angle), and the prism strip has a height of 10 to 200 ⁇ m.
  • the single structure in the microlens is circular, elliptical or polygonal as viewed from directly above the film surface; it is arc-shaped when viewed from the side of the film surface.
  • the single structure in the microlens has a diameter of 100-1000 ⁇ m and a distance between individual structures of 100-1000 ⁇ m.
  • a protective layer is disposed on the adhesive layer of the fluorescent film, and the protective layer functions as a barrier.
  • the protective layer is a solid material, and its composition is an inorganic oxide, an organic polymer, or a combination of an organic polymer and an inorganic oxide.
  • the invention also provides the use of the above fluorescent film, which is applied in a backlight, a display device, a lighting device or a protective film; the backlight, the display device, the illumination device and the protective film all comprise the invention Fluorescent film.
  • the present invention also provides a backlight comprising an excitation light source, a light guide plate, a reflective plate and a fluorescent film; the light guide plate is located under the fluorescent film, the reflective plate is located under the light guide plate, and the excitation light source is located at the Near or below the side of the light guide.
  • the display device includes a back plate, an excitation light source, a reflective plate, a light guide plate, a fluorescent film, a prism sheet, and a liquid crystal display module.
  • the illumination device includes an excitation light source, a light guide plate, and a fluorescent film.
  • the excitation light source directly excites the phosphor light in the fluorescent film after passing through the light guide plate.
  • the light from the phosphor mixes with the light from the excitation source to form an illumination source with specific requirements.
  • the protective film that is, the fluorescent film of the present invention.
  • the phosphor in the adhesive layer of the fluorescent film absorbs short-wavelength light (such as blue light, ultraviolet light, X-ray, etc.), converts it into long-wavelength light or partially converts it into heat. This causes the short-wavelength harmful light to be reduced in content after passing through the fluorescent film, reducing human irritation.
  • the excitation light source is selected from the group consisting of one or more of an electroluminescence (EL) lamp, a cold cathode fluorescent lamp (CCFL), and a light emitting diode (LED).
  • EL electroluminescence
  • CCFL cold cathode fluorescent lamp
  • LED light emitting diode
  • the light emitted by the excitation source should be capable of exciting the phosphor in the fluorescent film to emit light.
  • the above-mentioned high color gamut fluorescent film provided by the invention can controllably adjust the chromaticity coordinates to realize the controllable adjustment of the optical film chromaticity and color gamut.
  • the fluorescent film has an NTSC color gamut of at least 70% and a maximum of 110%, which is equivalent to the gamut and quantum dot film color gamut. Since the phosphor itself is very stable, the fluorescent film has a slow light decay and can be used in an optical display module for a long time.
  • the fluorescent film has low production cost, simple production process and high production yield.
  • a protective coating or a prism structure can be applied to the other surface of the fluorescent film substrate, which can further reduce the number of diaphragms used in the backlight module and reduce the cost.
  • the fluorescent film can be used not only in the backlight module of the display device, but also in the field of illumination, and has broad market application prospects.
  • the fluorescent film can also absorb short-wavelength stimulating light and be used as a protective film to reduce personal injury, such as use as an anti-blue film.
  • FIG. 1 is a schematic cross-sectional structural view of a fluorescent film according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic cross-sectional structural view of a fluorescent film according to Embodiment 7 of the present invention.
  • FIG. 3 is a schematic cross-sectional structural view of a fluorescent film according to Embodiment 8 of the present invention.
  • FIG. 4 is a schematic view of light passing through the fluorescent film shown in FIG.
  • the present invention provides a fluorescent film having a chromaticity coordinate and a gamut range adjustable, and the fluorescent film includes an adhesive layer 101 and a transparent substrate layer 102.
  • the adhesive layer 101 is bonded on one surface of the transparent substrate layer 102, and the adhesive layer 101 contains uniformly dispersed phosphors 1011 and Diffusion beads 1012.
  • the prism layer 103 as shown in FIG. 2) or the protective coating 104 may be coated on the other side of the fluorescent film transparent substrate (relative to the adhesive layer) (see FIG. 3). Shown).
  • the present invention provides a method for testing the chromaticity coordinates and color gamut range of the fluorescent film:
  • the backlight module Take a fluorescent film of A4 size and place it in the center of the 42-inch backlight module (blue LED source), and illuminate at 24V rated voltage.
  • the luminance of the backlight module was measured using a luminance meter (product model: BH-7, manufactured by Suzhou Fushida Scientific Instruments Co., Ltd.).
  • the color gamut range of the backlight module can be measured by using the aforementioned brightness meter.
  • the brightness of the backlight module is measured by the aforementioned brightness meter.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive layer comprises 15 parts by weight of yellow phosphor (component: aluminate), 5 parts by weight of diffusion beads and 100 weight Epoxy resin.
  • the diffusion microbeads are titanium dioxide having a particle diameter of 300 to 500 nm.
  • the transparent substrate was selected from polyethylene terephthalate (PET) having a thickness of 100 ⁇ m. After the phosphor and the diffusion beads are uniformly dispersed in the polyurethane resin, the mixed adhesive is uniformly coated on the transparent substrate PET, and then the adhesive layer is cured. The thickness of the adhesive layer after curing is 13-15 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive layer comprises 1 part by weight of yellow phosphor (component: aluminate), 250 parts by weight of diffusion microbeads and 100 weights. Parts of polyurethane resin.
  • the diffusion microbeads are silica having a particle diameter of 0.2 to 0.5 ⁇ m.
  • the transparent substrate was selected from polyethylene terephthalate (PET) having a thickness of 25 ⁇ m. After the phosphor and the diffusion beads are uniformly dispersed in the polyurethane resin, the mixed adhesive is uniformly coated on the transparent substrate PET, and then the adhesive layer is cured. The thickness of the adhesive layer after curing is 5-7 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive layer comprises 100 parts by weight of green phosphor (component: silicate) and 25 parts by weight of red phosphor (component: Nitride), 25 parts by weight of diffusion beads and 100 parts by weight of epoxy resin.
  • the diffusion microbeads are polymethyl methacrylate having a particle diameter of 20 to 25 ⁇ m.
  • the transparent substrate was selected from polyethylene terephthalate (PET) having a thickness of 250 ⁇ m. After the phosphor and the diffusion beads are uniformly dispersed in the epoxy resin, the mixed adhesive is uniformly coated on the transparent substrate, and then the adhesive layer is cured. The thickness of the adhesive layer after curing was 30 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive layer comprises 200 parts by weight of yellow phosphor (component: aluminate) and 50 parts by weight of red phosphor (component: Nitride) and 100 parts by weight of silicone resin.
  • the silicone resin containing the phosphor has a cured layer thickness of 15-17 ⁇ m.
  • a transparent substrate was selected from a polycarbonate (PC) sheet having a thickness of 25 ⁇ m. It should be noted that the diffusion microbeads are not added in this embodiment because the phosphor itself can be used as a diffusion microbead to function as a light diffusion and an optical path length increase.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive layer comprises 5 parts by weight of yellow phosphor (component: silicate) and 25 parts by weight of red phosphor (component: Nitride), 100 parts by weight of a green phosphor (component: aluminate), 125 parts by weight of diffusion microbeads and 100 parts by weight of an acrylic modified polyurethane.
  • the diffusion microbeads are polymethyl methacrylate having a particle diameter of 45 to 50 ⁇ m.
  • the resin containing the phosphor and the diffusion beads was cured to have a thickness of 75 ⁇ m.
  • the transparent substrate was selected from a polyethylene (PE) sheet having a thickness of 100 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive layer comprises 50 parts by weight of yellow phosphor (component: silicate) and 100 parts by weight of red phosphor (component: Nitride), 100 parts by weight of a green phosphor (ingredient: nitride), 100 parts by weight of diffusing microbeads, and 100 parts by weight of an acrylic resin.
  • the diffusion microbeads are barium sulfate having a particle diameter of 400 to 600 nm.
  • the resin containing the phosphor and the diffusion beads has a thickness of 25 to 30 ⁇ m after curing.
  • a transparent substrate was selected from a polyamide (PA) sheet having a thickness of 100 ⁇ m.
  • the embodiment of the adhesive layer is the same as that of Embodiment 1, and details are not described herein again.
  • the prism structure is coated on the other surface of the substrate (the opposite side of the adhesive layer).
  • the prism structure has an apex angle of 50° and a prism height of 100 ⁇ m.
  • the embodiment of the adhesive layer is the same as that of Embodiment 1, and details are not described herein again.
  • a protective coating is applied to the other surface of the substrate (the opposite side of the adhesive layer).
  • the protective coating has a thickness of 6-7 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive acrylic resin has a weight fraction of 100, and the phosphor has a weight fraction of 20, and the diffusion micro is The weight fraction of the beads is 5.
  • the phosphor includes 10 parts by weight of a red phosphor (material is nitride) and 10 parts by weight of a green phosphor (material is silicate), and the phosphor has a particle diameter of 0.2 to 4 ⁇ m.
  • the material of the diffusion beads is silica, and the diffusion beads have a particle diameter of 0.3 to 10 ⁇ m.
  • the adhesive layer has a thickness of 5 ⁇ m.
  • the transparent substrate was selected from PET sheets having a thickness of 100 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and a color gamut range, wherein the adhesive acrylic resin has a weight fraction of 100, and the phosphor has a weight fraction of 100, and the diffusion micro is The weight fraction of the beads is 50.
  • the phosphor includes 50 parts by weight of a red phosphor (material is nitrogen oxide) and 50 parts by weight of a green phosphor (material is aluminate), and the phosphor has a particle diameter of 40 to 50 ⁇ m.
  • the material of the diffusion microbeads is titanium dioxide, and the diffusion microspheres have a particle diameter of 20-30 ⁇ m.
  • the thickness of the adhesive layer was 75 ⁇ m.
  • the transparent substrate was selected from PET sheets having a thickness of 100 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive epoxy resin has a weight fraction of 100, the phosphor has a weight fraction of 60, and the diffusion
  • the number of parts by weight of the beads was 30.
  • the phosphor comprises 30 parts by weight of red phosphor (material is silicate) And 30 parts by weight of a green phosphor (material is an aluminate) having a particle diameter of 30 to 50 ⁇ m.
  • the material of the diffusion microbeads is barium sulfate, and the diffusion beads have a particle diameter of 10-20 ⁇ m.
  • the adhesive layer had a thickness of 55 ⁇ m.
  • the transparent substrate was selected from PET sheets having a thickness of 100 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive polyurethane resin has a weight fraction of 100, and the phosphor has a weight fraction of 80, and the diffusion micro is The weight fraction of the beads is 15.
  • the phosphor includes 40 parts by weight of a red phosphor (material is nitride) and 40 parts by weight of a green phosphor (material is aluminate), and the phosphor has a particle diameter of 0.2 to 20 ⁇ m.
  • the material of the diffusion microbeads is PMMA, and the diffusion beads have a particle diameter of 0.3 to 5 ⁇ m.
  • the adhesive layer has a thickness of 35 ⁇ m.
  • the transparent substrate was selected from PET sheets having a thickness of 100 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive acrylic resin has a weight fraction of 100, and the phosphor has a weight fraction of 20, and the diffusion micro is The weight fraction of the beads is 25.
  • the phosphor includes 10 parts by weight of a red phosphor (material is a nitride) and 10 parts by weight of a green phosphor (material is an aluminate), and the phosphor has a particle diameter of 5 to 25 ⁇ m.
  • the material of the diffusion beads is barium sulfate, and the diffusion beads have a particle diameter of 10-30 ⁇ m.
  • the adhesive layer has a thickness of 30 ⁇ m.
  • the transparent substrate was a PET sheet having a thickness of 100 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the adhesive polyurethane resin has a weight fraction of 100, and the phosphor has a weight fraction of 50, and the diffusion micro is The weight fraction of the beads is 5.
  • the phosphor includes 20 parts by weight of a red phosphor (material is nitride) and 30 parts by weight of a green phosphor (material is aluminate), and the phosphor has a particle diameter of 5 to 25 ⁇ m.
  • the material of the diffusion microbead is titanium dioxide, and the diffusion microbead has a particle diameter of 10-30 ⁇ m.
  • the adhesive layer has a thickness of 10 ⁇ m.
  • the transparent substrate was a PET sheet having a thickness of 100 ⁇ m.
  • the invention provides a fluorescent film with adjustable chromaticity coordinates and color gamut, wherein the glue
  • the adhesive epoxy resin has a weight fraction of 100, the phosphor has a weight fraction of 35, and the diffusing microbead has a weight fraction of 15.
  • the phosphor includes 15 parts by weight of a red phosphor (material is nitride) and 20 parts by weight of a green phosphor (material is aluminate), and the phosphor has a particle diameter of 5 to 25 ⁇ m.
  • the material of the diffusion beads is barium sulfate, and the diffusion beads have a particle diameter of 10-30 ⁇ m.
  • the adhesive layer has a thickness of 35 ⁇ m.
  • the transparent substrate was a PET sheet having a thickness of 100 ⁇ m.
  • Example 1 The embodiment of the adhesive layer was referred to Example 1, except that the diffusion microbeads of titanium dioxide were not added in Comparative Example 1, and other experimental parameters were the same as in Example 1.
  • Example 1 The embodiment of the adhesive layer was referred to Example 1, except that the addition amount of the phosphor was increased to 2 times in Example 1 in Comparative Example 2, and other experimental parameters were the same as in Example 1.
  • Example 1 (0.241, 0.215) 72.3% 3268
  • Example 2 (0.176, 0.0.073) 72.6% 2172
  • Example 3 (0.235, 0.154) 102.5% 1657
  • Example 4 (0.312, 0.347) 85.6% 3874
  • Example 5 (0.327, 0.319) 93.4% 2906
  • Example 6 (0.356, 0.341) 88.2% 4162
  • Example 7 (0.243, 0.217) 72.8% 4059
  • Example 8 (0.239, 0.220) 72.8% 3291
  • Example 9 (0.316, 0.321) 90.2%
  • Example 10 (0.306, 0.317) 91.0% 3609
  • Example 11 (0.339, 0.320) 90.8% 3791
  • Example 12 (0.306, 0.301) 91.2% 3602
  • Example 13 (0.316, 0.317) 95.0% 4009
  • Example 14 (0.309, 0.310) 98.8% 4121
  • Example 15 (0.316, 0.301) 110% 4012
  • Comparative example 1 (0.208, 0.128) 71.9% 2880
  • Comparative example 2 (0.283, 0.262) 72.6% 4330
  • the chromaticity coordinates and color gamut range of the fluorescent film provided by the present invention can be artificially regulated, so as to meet the needs of different customers.
  • the addition of the diffusion beads increases the optical path of the incident light and improves the efficiency of the phosphor using the excitation light, thereby ultimately increasing the brightness of the fluorescent film.
  • the chromaticity coordinates and brightness of the fluorescent film can be adjusted.
  • the addition of the prism structure can further increase the brightness of the fluorescent film.
  • Example 1 and Example 8 it can be seen from Example 1 and Example 8 that the application of the protective coating does not affect the color gamut and has less influence on the chromaticity coordinates and brightness. More importantly, it can be seen from Example 1 to Example 6 that by mixing different types of phosphors of different types or the same phosphor system, fluorescent films having different NTSC color gamuts can be adjusted, and have wide applications. market.
  • the fluorescent films provided in Examples 9 to 15 have both a high color gamut and brightness.
  • the fluorescent films provided in Examples 13 to 15 have both a higher color gamut and brightness.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Adhesive Tapes (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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Abstract

一种色度坐标和色域范围可调的荧光薄膜，包括透明基材层（102）和胶黏层（101），胶黏层（101）粘结在透明基材层（102）的一个表面上。胶黏层（101）包括胶黏剂和荧光粉（1011），荧光粉（1011）均匀地分散于胶黏剂中。还可在透明基材层（102）的另一个表面设置保护涂层（104）或棱镜结构（103）。这种荧光薄膜可应用于背光显示领域、照明领域，还可作为防护膜，吸收部分光线以减少对人身的伤害。这种荧光薄膜克服了现有OLED和量子点膜成本高，稳定性差和使用寿命低的缺陷。

Description

一种色度坐标和色域范围可调的荧光薄膜 技术领域
本发明涉及薄膜显示技术领域，尤其涉及一种色度坐标和色域范围可调的荧光薄膜。
背景技术
随着显示行业的不断发展，近年来市场对显示画面的要求也越来越高。主流趋势包括高色域、超大尺寸和柔性等。其中，不断提高色域是显示行业追求的一个重要指标，这是因为一台高色域的显示器画面更加鲜艳和生动逼真。目前通常使用OLED和量子点薄膜两种方案来提高色域，其色域都可超过100％。然而，OLED和量子点膜技术的发展瓶颈也是显而易见的。例如，OLED发展还不够成熟，在成本及使用寿命上有很大限制，同时工艺上也很难满足生产大尺寸OLED的要求。另一方面，量子点薄膜目前价格非常昂贵，且量子点原料本身也很不稳定，阻碍了其大规模使用。
发明内容
为了解决现有OLED和量子点膜成本高，稳定性差和使用寿命低的缺陷，本发明提供一种色度坐标和色域范围可调的荧光薄膜。该荧光薄膜不仅可应用于背光显示技术中，同时还可应用在照明领域。
为了解决现有技术中的上述问题，本发明采用下述技术方案：
本发明提供一种色度坐标和色域范围可调的荧光薄膜，所述荧光薄膜包括透明基材层和胶黏层；所述胶黏层粘结在所述透明基材层的表面上；所述胶黏层包括胶黏剂和荧光粉；所述荧光粉分散于胶黏剂中。胶黏层可简称为胶层。
进一步的，所述胶黏层粘结在所述透明基材层的一个表面上。
进一步的，所述荧光粉均匀地分散于胶黏剂中。
进一步的，所述透明基材层的材料选自聚对苯二甲酸乙二醇酯(PET)、聚甲基丙烯酸甲酯(PMMA)、聚碳酸酯(PC)、聚酰胺树脂(PA)、聚苯乙烯(PS)和聚乙烯(PE)中的一种或至少两种的混合物。
进一步的，所述透明基材的厚度为25-250μm。
进一步的，所述胶黏剂选自丙烯酸树脂、聚氨酯树脂、环氧树脂、聚苯乙烯树脂、丙烯酸改性聚氨酯、丙烯酸改性有机硅氧烷树脂和有机硅氧烷树脂中的一种或至少两种的混合物。所述胶黏剂固化后形成胶黏层。由胶黏剂固化后形成的胶黏层的厚度为5-75μm。
进一步的，所述荧光粉选自铝酸盐、硅酸盐、氮化物、氮氧化物、硼酸盐、钒酸盐、碱土金属硫化物、钼酸盐、钨酸盐、硼磷酸盐、氯硼酸盐、磷酸盐、氯硅酸盐、钒磷酸盐和氧化锌体系中的一种或者至少两种的组合。所述荧光粉还可选自前述任意一种体系下不同产品中的一种或至少两种的组合。
进一步的，所述的荧光薄膜中，所述胶黏层还包括扩散微珠，所述扩散微珠分散于胶黏剂中。进一步的，所述扩散微珠均匀地分散于胶黏剂中。
进一步的，所述的荧光薄膜中，所述胶黏剂为100重量份，所述荧光粉为1-250重量份。
本发明提供的上述技术方案，通过改变荧光粉的加入量或者在混合型荧光粉中，通过调节不同荧光粉的加入量或者其相对加入比例来调控所述荧光薄膜的色度坐标。混合型荧光粉即不同的荧光粉的组合物。
进一步的，通过改变所加入荧光粉的类型或者混合不同荧光粉来调节所述荧光薄膜的色域范围。所述荧光薄膜的NTSC色域范围≥70％，最高可至110％。
进一步的，所述胶黏层里还包括有均匀分散的扩散微珠。所述扩散微珠 选自二氧化硅、二氧化钛、三氧化二铝、硫酸钡、钛酸钡、玻璃微珠(即反光粉)、碳酸钙、聚甲基丙烯酸甲酯(PMMA)、聚苯乙烯(PS)、丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚氨酯(PU)和有机硅聚合物中的一种或者至少两种的组合。所述扩散微珠的粒径为0.2-50μm。
进一步的，所述的荧光薄膜中，所述胶黏剂为100重量份，所述扩散微珠为0-250重量份。
进一步的，所述的荧光薄膜中，所述胶黏剂为100重量份，所述荧光粉为20-100重量份，所述扩散微珠为5-50重量份。
进一步的，所述荧光粉的材质优选为铝酸盐、硅酸盐、氮化物和氮氧化物中的一种或至少两种的组合。所述扩散微珠的材质优选为二氧化硅、二氧化钛、硫酸钡和PMMA中的一种或至少两种的组合，所述扩散微珠的粒径优选为0.3-30μm。
进一步的，所述荧光粉的粒径为0.2-50μm。
进一步的，本发明提供的色度坐标和色域范围可调的荧光薄膜中，所述胶黏剂的重量份数为100，所述荧光粉的重量份数为20-50，所述扩散微珠的重量份数为5-25。所述荧光粉的材质为铝酸盐或氮化物，所述荧光粉的粒径为5-25μm。所述扩散微珠的材质为二氧化钛或硫酸钡，所述扩散微珠的粒径优选为10-30μm。
进一步的，所述胶黏层厚度为10-35μm。透明基材为厚度为100μm的PET片材。
进一步的，所述荧光粉包括红色荧光粉(材质为氮化物)和绿色荧光粉(材质为铝酸盐)。
进一步的，所述的荧光薄膜中，为了继续扩展光学功能并进一步减少背光模组中膜片使用量，所述荧光薄膜还可涂布保护涂层或棱镜结构层。即，所述荧光薄膜还包括保护涂层或棱镜结构层，所述保护涂层或棱镜结构层设置于透明基材层的另一个表面(胶黏层的对立面)上。
所述保护涂层表面具有不规则的凸起。所述保护涂层的厚度为2-15μm。
进一步的，所述棱镜结构由棱镜条或微透镜(Microlens)中的一种组成。所述棱镜条的横截面(从膜面侧面观看)为三角形，其顶角角度为50°-130°。所述棱镜条的顶角顶端为尖角或者圆弧形状(即R角)，棱镜条高度为10-200μm。所述微透镜(Microlens)中的单个结构，从膜面正上方看为圆形、椭圆形或者多边形；从膜面侧面看为圆弧状。所述微透镜(Microlens)中单个结构的直径为100-1000μm，单个结构之间的距离为100-1000μm。
进一步的，所述的荧光薄膜中，为了延长所述荧光薄膜的使用寿命，所述荧光薄膜的胶黏层上设置一层保护层，所述保护层起到阻隔作用。所述保护层为固体材料，其成份为无机氧化物、有机聚合物，或者为有机聚合物和无机氧化物的组合物。
本发明还提供上述荧光薄膜的用途，所述荧光薄膜应用在背光源、显示装置、照明装置或防护膜中；所述的背光源、显示装置、照明装置和防护膜，都包含本发明所述的荧光薄膜。
本发明还提供一种背光源，所述背光源包括激发光源、导光板、反射板和荧光薄膜；所述导光板位于荧光薄膜下方，所述反射板位于导光板下方，所述激发光源位于所述导光板侧边附近或者下方。
进一步的，所述显示装置，包括背板、激发光源、反射板、导光板、荧光薄膜、棱镜片和液晶显示器模组。
进一步的，所述照明装置，包括激发光源、导光板和荧光薄膜。所述激发光源在经过导光板后，直接激发荧光薄膜中的荧光粉发光。荧光粉发出的光与激发光源发出的光混合，形成具有特定要求的照明光源。
进一步的，所述防护膜，即本发明所述的荧光薄膜。所述荧光薄膜胶黏层里的荧光粉可吸收短波长光线(如蓝光、紫外线和X射线等)，转化为长波长光线或部分转化为热。这使得短波长的有害光线在穿过所述荧光薄膜后含量有所降低，减少了对人的刺激。
进一步的，所述激发光源选自电致发光(EL)灯、冷阴极荧光灯(CCFL)、发光二极管(LED)中的一种或者多种的组合。所述激发光源发出的光线应当能够激发荧光薄膜中的荧光粉发光。
与现有技术相比，本发明提供的上述高色域的荧光薄膜，其色度坐标可以进行可控调节，实现光学膜片色度和色域的可控制调节。这种荧光薄膜的NTSC色域范围至少70％，最高可至110％，可达到OLED和量子点膜色域范围的同等水平。由于荧光粉本身很稳定，因此所述荧光薄膜光衰缓慢，可长期使用在光学显示模组中。所述荧光薄膜生产成本也较低，生产工艺简单，生产良率高。此外，作为光学功能的扩展，还可在荧光薄膜基材的另一面涂布保护涂层或者棱镜结构，可进一步降低背光模组的膜片使用数量，降低成本。此荧光薄膜不仅可用于显示器件的背光模组中，也可以用于照明领域，具有广泛的市场应用前景。此外，所述荧光薄膜还可吸收短波长刺激光线，作为防护膜使用以减少对人身的伤害，如作为防蓝光膜片使用。
附图说明
图1为本发明实施例1中荧光薄膜剖视结构示意图；
图2为本发明实施例7中荧光薄膜剖视结构示意图；
图3为本发明实施例8中荧光薄膜剖视结构示意图；
图4为光线穿过图3所示荧光薄膜的示意图。
具体实施方式
下面结合较佳实施例和对比例，来说明本发明所提供的荧光薄膜的技术方案、主要功能特点和优势。
如图1所示，本发明提供的一种色度坐标和色域范围可调的荧光薄膜，所述荧光薄膜包括胶黏层101和透明基材层102。所述胶黏层101粘结在透明基材层102的一个表面上，所述胶黏层101里包含均匀分散的荧光粉1011和 扩散微珠1012。进一步地，作为光学功能的扩展，可在荧光薄膜透明基材的另一面(相对于胶黏层来说)涂布棱镜层103(如图2所示)，或者保护涂层104(如图3所示)。
本发明提供下述方法来测试所述荧光薄膜的色度坐标和色域范围：
取一张A4大小的荧光薄膜，放置在42寸背光模组(蓝光LED灯源)的正中央，在24V额定电压下点亮。使用亮度仪(产品型号：BH-7，苏州弗士达科学仪器有限公司生产)测量背光模组的色度。继续在荧光薄膜上覆盖棱镜膜+DBEF+液晶显示模组后，用前述亮度仪即可测量背光模组的色域范围。
用前述亮度仪测量背光模组的亮度。
实施例1
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，胶黏层包括15重量份的黄色荧光粉(成分：铝酸盐)，5重量份的扩散微珠和100重量份的环氧树脂。所述扩散微珠是粒径为300-500nm的二氧化钛。透明基材选用厚度为100μm的聚对苯二甲酸乙二醇酯(PET)。荧光粉和扩散微珠在聚氨酯树脂里分散均匀后，将混合好的胶黏剂均匀的涂布在透明基材PET上，然后使胶层固化。胶层固化后的厚度为13-15μm。
实施例2
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，胶黏层包括1重量份的黄色荧光粉(成分：铝酸盐)，250重量份的扩散微珠和100重量份的聚氨酯树脂。所述扩散微珠是粒径为0.2-0.5μm的二氧化硅。透明基材选用厚度为25μm的聚对苯二甲酸乙二醇酯(PET)。荧光粉和扩散微珠在聚氨酯树脂里分散均匀后，将混合好的胶黏剂均匀的涂布在透明基材PET上，然后使胶层固化。胶层固化后的厚度为5-7μm。
实施例3
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，胶黏层包括100重量份的绿色荧光粉(成分：硅酸盐)，25重量份的红色荧光粉(成分： 氮化物)，25重量份的扩散微珠和100重量份的环氧树脂。所述扩散微珠是粒径为20-25μm的聚甲基丙烯酸甲酯。透明基材选用厚度为250μm的聚对苯二甲酸乙二醇酯(PET)。荧光粉和扩散微珠在环氧树脂里分散均匀后，将混合好的胶黏剂均匀的涂布在透明基材上，然后使胶层固化。胶层固化后的厚度为30μm。
实施例4
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，胶黏层包括200重量份的黄色荧光粉(成分：铝酸盐)，50重量份的红色荧光粉(成分：氮化物)和100重量份的有机硅树脂。包含有荧光粉的有机硅树脂固化后的胶层厚度为15-17μm。透明基材选用厚度为25μm的聚碳酸酯(PC)片材。值得注意的是，本实施例中并未添加扩散微珠，这是因为荧光粉本身即可作为扩散微珠使用，起到光扩散和增加光程的作用。
实施例5
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，胶黏层包括5重量份的黄色荧光粉(成分：硅酸盐)，25重量份的红色荧光粉(成分：氮化物)，100重量份的绿色荧光粉(成分：铝酸盐)，125重量份的扩散微珠和100重量份的丙烯酸改性聚氨酯。所述扩散微珠是粒径为45-50μm的聚甲基丙烯酸甲酯。包含有荧光粉和扩散微珠的树脂固化后胶层厚度为75μm。透明基材选用厚度为100μm的聚乙烯(PE)片材。
实施例6
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，胶黏层包括50重量份的黄色荧光粉(成分：硅酸盐)，100重量份的红色荧光粉(成分：氮化物)，100重量份的绿色荧光粉(成分：氮化物)，100重量份的扩散微珠和100重量份的丙烯酸树脂。所述扩散微珠是粒径为400-600nm的硫酸钡。包含有荧光粉和扩散微珠的树脂固化后胶层厚度为25-30μm。透明基材选用厚度为100μm的聚酰胺(PA)片材。
实施例7
胶黏层的实施方案同实施例1，这里不再赘述。在包含有荧光粉的胶黏层固化后，在基材的另一个表面(胶黏层的对立面)涂布棱镜结构。棱镜结构顶角为50°，棱镜高度为100μm。
实施例8
胶黏层的实施方案同实施例1，这里不再赘述。在包含有荧光粉的胶黏层固化后，在基材的另一个表面(胶黏层的对立面)涂布保护涂层。保护涂层的厚度为6-7μm。
实施例9
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，所述胶黏剂丙烯酸树脂的重量份数为100，所述荧光粉的重量份数为20，所述扩散微珠的重量份数为5。所述荧光粉包括10重量份的红色荧光粉(材质为氮化物)和10重量份的绿色荧光粉(材质为硅酸盐)，所述荧光粉的粒径为0.2-4μm。所述扩散微珠的材质为二氧化硅，所述扩散微珠的粒径为0.3-10μm。所述胶黏层厚度为5μm。透明基材选用厚度为100μm的PET片材。
实施例10
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，所述胶黏剂丙烯酸树脂的重量份数为100，所述荧光粉的重量份数为100，所述扩散微珠的重量份数为50。所述荧光粉包括50重量份的红色荧光粉(材质为氮氧化物)和50重量份的绿色荧光粉(材质为铝酸盐)，所述荧光粉的粒径为40-50μm。所述扩散微珠的材质为二氧化钛，所述扩散微珠的粒径为20-30μm。所述胶黏层厚度为75μm。透明基材选用厚度为100μm的PET片材。
实施例11
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，所述胶黏剂环氧树脂的重量份数为100，所述荧光粉的重量份数为60，所述扩散微珠的重量份数为30。所述荧光粉包括30重量份的红色荧光粉(材质为硅酸盐) 和30重量份的绿色荧光粉(材质为铝酸盐)，所述荧光粉的粒径为30-50μm。所述扩散微珠的材质为硫酸钡，所述扩散微珠的粒径为10-20μm。所述胶黏层厚度为55μm。透明基材选用厚度为100μm的PET片材。
实施例12
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，所述胶黏剂聚氨酯树脂的重量份数为100，所述荧光粉的重量份数为80，所述扩散微珠的重量份数为15。所述荧光粉包括40重量份的红色荧光粉(材质为氮化物)和40重量份的绿色荧光粉(材质为铝酸盐)，所述荧光粉的粒径为0.2-20μm。所述扩散微珠的材质为PMMA，所述扩散微珠的粒径为0.3-5μm。所述胶黏层厚度为35μm。透明基材选用厚度为100μm的PET片材。
实施例13
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，所述胶黏剂丙烯酸树脂的重量份数为100，所述荧光粉的重量份数为20，所述扩散微珠的重量份数为25。所述荧光粉包括10重量份的红色荧光粉(材质为氮化物)和10重量份的绿色荧光粉(材质为铝酸盐)，所述荧光粉的粒径为5-25μm。所述扩散微珠的材质为硫酸钡，所述扩散微珠的粒径为10-30μm。所述胶黏层厚度为30μm。透明基材为厚度为100μm的PET片材。
实施例14
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，所述胶黏剂聚氨酯树脂的重量份数为100，所述荧光粉的重量份数为50，所述扩散微珠的重量份数为5。所述荧光粉包括20重量份的红色荧光粉(材质为氮化物)和30重量份的绿色荧光粉(材质为铝酸盐)，所述荧光粉的粒径为5-25μm。所述扩散微珠的材质为二氧化钛，所述扩散微珠的粒径为10-30μm。所述胶黏层厚度为10μm。透明基材为厚度为100μm的PET片材。
实施例15
本发明提供的一种色度坐标和色域范围可调的荧光薄膜，其中，所述胶 黏剂环氧树脂的重量份数为100，所述荧光粉的重量份数为35，所述扩散微珠的重量份数为15。所述荧光粉包括15重量份的红色荧光粉(材质为氮化物)和20重量份的绿色荧光粉(材质为铝酸盐)，所述荧光粉的粒径为5-25μm。所述扩散微珠的材质为硫酸钡，所述扩散微珠的粒径为10-30μm。所述胶黏层厚度为35μm。透明基材为厚度为100μm的PET片材。
对比例1
胶黏层的实施方案参考实施例1，只是在对比例1中未加入扩散微珠二氧化钛，其他的实验参数与实施例1相同。
对比例2
胶黏层的实施方案参考实施例1，只是在对比例2中把荧光粉的加入量增加到实施例1中的2倍，其他的实验参数与实施例1相同。
表1：本发明实施例及对比例所得荧光膜的光学性能测试结果
序号 色度(X，Y) NTSC色域 亮度(cd/m2)
实施例1 (0.241，0.215) 72.3％ 3268
实施例2 (0.176，0.0.073) 72.6％ 2172
实施例3 (0.235，0.154) 102.5％ 1657
实施例4 (0.312，0.347) 85.6％ 3874
实施例5 (0.327，0.319) 93.4％ 2906
实施例6 (0.356，0.341) 88.2％ 4162
实施例7 (0.243，0.217) 72.8％ 4059
实施例8 (0.239，0.220) 72.8％ 3291
实施例9 (0.316，0.321) 90.2％ 3562
实施例10 (0.306，0.317) 91.0％ 3609
实施例11 (0.339，0.320) 90.8％ 3791
实施例12 (0.306，0.301) 91.2％ 3602
实施例13 (0.316，0.317) 95.0％ 4009
实施例14 (0.309，0.310) 98.8％ 4121
实施例15 (0.316，0.301) 110％ 4012
对比例1 (0.208，0.128) 71.9％ 2880
对比例2 (0.283，0.262) 72.6％ 4330
从表1可以得出，本发明所提供的荧光薄膜色度坐标和色域范围可进行人为调控，这样可满足不同客户的需求。由实施例1和对比例1看出，扩散微珠的加入，增加了入射光的光程，提高了荧光粉利用激发光的效率，因此最终提高了荧光薄膜的亮度。由实施例1和对比例2看出，仅仅改变荧光粉的加入量(即使是同一种荧光粉)，即可调控荧光薄膜的色度坐标和亮度。由实施例1和实施例7看出，棱镜结构的加入，可进一步提高荧光薄膜的亮度。由实施例1和实施例8看出，涂布保护涂层不会影响色域，对色度坐标和亮度也影响较小。更为重要的是，从实施例1至实施例6可看出，通过混合不同类型或者同一荧光粉体系下不同型号的荧光粉，可调节出具有不同NTSC色域的荧光薄膜，具有广泛的应用市场。本发明中，实施例9至实施例15提供的荧光薄膜同时具有较高的色域和亮度。特别的，实施例13至实施例15提供的荧光薄膜同时具有更高的色域和亮度。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡是根据本发明内容所做的均等变化与修饰，均涵盖在本发明的专利范围内。

Claims (10)

  1. 一种色度坐标和色域范围可调的荧光薄膜，其特征在于，所述荧光薄膜包括透明基材层和胶黏层；所述胶黏层粘结在所述透明基材层的表面上；所述胶黏层包括胶黏剂和荧光粉；所述荧光粉分散于胶黏剂中。
  2. 根据权利要求1所述的荧光薄膜，其特征在于，所述胶黏层还包括扩散微珠，所述扩散微珠分散于胶黏剂中。
  3. 根据权利要求1或2所述的荧光薄膜，其特征在于，所述胶黏剂为100重量份，所述荧光粉为1-250重量份。
  4. 根据权利要求2所述的荧光薄膜，其特征在于，所述胶黏剂为100重量份，所述扩散微珠为0-250重量份。
  5. 根据权利要求2所述的荧光薄膜，其特征在于，所述胶黏剂为100重量份，所述荧光粉为20-100重量份数，所述扩散微珠为5-50重量份。
  6. 根据权利要求1所述的荧光薄膜，其特征在于，所述荧光薄膜还包括保护涂层或棱镜结构层，所述保护涂层或棱镜结构层设置于透明基材层的另一个表面上。
  7. 根据权利要求1所述的荧光薄膜，其特征在于，所述荧光薄膜的胶黏层上设置一层保护层，所述保护层起到阻隔作用。
  8. 根据权利要求1-7之一所述的荧光薄膜的用途，其特征在于，所述荧光薄膜应用在背光源、显示装置、照明装置或防护膜中；所述的背光源、显示装置、照明装置和防护膜，都包含如权利要求1-7之一所述的荧光薄膜。
  9. 一种背光源，其特征在于，所述背光源包括激发光源、导光板、反射板和权利要求1-7之一所述的荧光薄膜；所述导光板位于荧光薄膜下方，所述反射板位于导光板下方，所述激发光源位于所述导光板侧边或者下方。
  10. 根据权利要求9所述的背光源，其特征在于，所述激发光源选自电致发光(EL)灯、冷阴极荧光灯(CCFL)、发光二极管(LED)中的一种或者多种的组合。
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