CN107179574B - High-luminance wide-viewing-angle brightness enhancement film - Google Patents
High-luminance wide-viewing-angle brightness enhancement film Download PDFInfo
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- CN107179574B CN107179574B CN201710616594.2A CN201710616594A CN107179574B CN 107179574 B CN107179574 B CN 107179574B CN 201710616594 A CN201710616594 A CN 201710616594A CN 107179574 B CN107179574 B CN 107179574B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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Abstract
The invention relates to a brightness enhancement film used for a backlight source in a liquid crystal display, in particular to a brightness enhancement film with high luminance and wide viewing angle. The invention provides a high-brightness wide-viewing-angle brightness enhancement film, aiming at solving the problems of insufficient brightness and small visual angle of a large-size display. The high-brightness wide-view-angle brightness enhancement film provided by the invention sequentially comprises a brightness enhancement structure layer, a substrate layer and a back coating layer. The brightness enhancement film provided by the invention has the characteristics of higher luminance performance, high scratch resistance, wide viewing angle and the like, and can effectively solve the problems of serious energy consumption, insufficient brightness, small viewing angle and the like of a display after being applied to a backlight module.
Description
Technical Field
The invention relates to a brightness enhancement film used for a backlight source in a liquid crystal display, in particular to a brightness enhancement film with high luminance and wide viewing angle.
Background
The brightness enhancement film is one of the most important optical films widely used in backlight modules of liquid crystal displays, and has the main function of concentrating light rays emitted from a light source in all directions to the front side, so that the light utilization rate is improved, the light loss is reduced, and the purposes of improving the backlight brightness or reducing the power consumption are achieved. The brightening principle is that the special triangular structure is utilized, when light scattered by the diffusion sheet reaches the surface of the structure, light rays smaller than the key angle of refraction of the brightening film material are emitted out through the structural surface, light rays larger than the key angle of refraction of the brightening film material are reflected back to the diffusion sheet through the structural surface, and part of light rays are recycled. Thus, the emergent rays are concentrated within about +/-35 degrees (from the normal direction), and the brightness of the central visual angle is improved.
In order to increase the brightness of the central viewing angle of the brightness enhancement film, an acrylic resin material with a high refractive index needs to be selected, but after the refractive index is increased, the scratch resistance of the brightness enhancement film is poor, the central viewing angle is reduced, the production of the downstream assembly industry is not facilitated, and the viewing angle of people is further influenced.
Disclosure of Invention
The invention provides a brightness enhancement film with high luminance and wide viewing angle, aiming at solving the problems of insufficient brightness and small visual angle of a large-size display. The brightness enhancement film sequentially comprises a brightness enhancement structural layer, a substrate layer and a back coating layer. The brightness enhancement film has the characteristics of high luminance performance, high scratch resistance, wide viewing angle and the like, and can effectively solve the problems of serious energy consumption, insufficient brightness, assembly scratch, small viewing angle and the like of a display after being applied to a backlight module. A large size display generally refers to a display having a diagonal edge length greater than or equal to 19 inches.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a high-brightness wide-viewing-angle brightness enhancement film which sequentially comprises a brightness enhancement structure layer, a base material layer and a back coating layer. The brightening structure layer comprises bonding resin and inorganic oxide particles. The adhesive resin is selected from solvent-free ultraviolet curing resin
The brightening structure layer comprises solvent-free ultraviolet curing resin and inorganic oxide particles; the substrate layer comprises a polyester resin; the back coating comprises solvent-based ultraviolet curing resin, acrylic (polymethyl methacrylate) particles and a solvent.
Furthermore, the solvent-free ultraviolet curing resin of the brightening structure layer is polyester acrylic resin.
Furthermore, the refractive index of the solvent-free type ultraviolet curing resin in the brightening structure layer is 1.51-1.55.
Further, the refractive index of the polyester acrylic resin is preferably 1.53.
Further, the polyester resin of the substrate layer is PET, and the thickness of the substrate layer is 188-.
Further, the thickness of the base material layer is preferably 188 μm.
Further, the solvent-based ultraviolet curing resin of the back coating layer is one or a combination of at least two of acrylic resin, polyester resin, polyurethane resin, polyethylene resin and polyvinyl chloride resin.
Further, the solvent-based ultraviolet curing resin of the back coating layer is preferably a solvent-based ultraviolet curing acrylic resin.
Further, the brightening structure layer is a prism structure layer, the cross section of the prism structure layer comprises connected isosceles triangles, and the vertex angles of the isosceles triangles are circular arcs. Further, the bottom sides of the isosceles triangles are connected. Furthermore, the bottom sides of the isosceles triangles are partially overlapped.
Furthermore, the brightening structure layer comprises a plurality of prism strips, the cross sections of the prism strips are isosceles triangles, the bottom edges of the triangles are connected, and the top angles of the triangles are fillets.
The round angle is formed by replacing the original angle with a section of circular arc tangent to two sides of the angle, and the size of the round angle is represented by the radius of the circular arc.
Further, the angle of the vertex angle of the isosceles triangle is 60-140 degrees, and the radius of the circular arc is 0-4 μm.
Furthermore, the angle of the vertex angle of the isosceles triangle is 60-140 degrees, the height of the isosceles triangle is 20-30 μm, and the radius of the circular arc is 0.5-4 μm.
Further, the vertex angle of the isosceles triangle is preferably 120-140 °.
Further, the vertex angle of the isosceles triangle is preferably 120 °.
Further, the height of the isosceles triangle is preferably 25 μm.
Further, the radius of the circular arc is preferably 2 to 3 μm.
Further, the radius of the circular arc is preferably 2 μm.
Further, the particle size of the inorganic oxide particles is 100-200 nm.
Further, the material of the inorganic oxide particles is selected from TiO2、Al2O3Or ZnS.
Further, the inorganic oxide particles have a refractive index different from that of a binder resin (e.g., a solventless ultraviolet curing resin).
Furthermore, the refractive index of the inorganic oxide particles is TiO in sequence from large to small2ZnS and Al2O3。
I.e. TiO2Refractive index of particles > refractive index of ZnS particles > Al2O3The refractive index of the particles.
Further, the inorganic oxide particles are preferably TiO2The particle size of the inorganic oxide particles is preferably 120-150 nm.
Furthermore, the dosage of the inorganic oxide particles is 1 to 5 percent of the dosage of the binding resin (such as solvent-free type ultraviolet curing resin), and the percentage is weight percentage.
Further, the amount of the inorganic oxide particles is preferably 3% to 4% of the amount of the binder resin (e.g., solvent-free type ultraviolet curing resin).
Further, the raw materials of the back coating are firstly prepared into back coating liquid, the back coating liquid comprises 19-39% of solvent type ultraviolet curing resin glue, 0.01-5% of acrylic (polymethyl methacrylate) particles and 60-80% of solvent, and the percentages are weight percentages.
Further, the solvent is selected from one or a combination of at least two of butanone, toluene, butyl acetate, ethyl acetate, cyclohexanone, propylene glycol methyl ether, isopropanol or ethanol.
Further, the solvent is preferably methyl ethyl ketone, toluene and propylene glycol methyl ether. Furthermore, the mass ratio of the butanone to the toluene to the propylene glycol methyl ether is 1:1: 2.
Further, the particle size of the acrylic particles is 1-20 μm.
Further, the particle size of the acryl particles is preferably 3 to 7 μm.
Further, the particle size of the acryl particles is preferably 3 to 5 μm.
Furthermore, the height of an isosceles triangle in the brightening structure layer is 20-30 μm, the angle of the top angle of the isosceles triangle is 120-140 degrees, and the radius of the circular arc is 2-3 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The particle size is 100-200nm, and the dosage of the particles is 3-4% of that of the adhesive resin (such as polyester acrylic resin). The technical scheme comprises embodiments 1-6, embodiment 16, embodiments 23-26 and embodiments 28-31.
Furthermore, in the brightness enhancement structure layer, the substrate layer is PET, and the thickness of the substrate layer is 188-; the back coating comprises 19-39% of solvent type ultraviolet curing acrylic resin glue, 1-3% of acrylic (polymethyl methacrylate) particles, 3-7 μm of acrylic particles in particle size and 60-80% of solvent, wherein the solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1: 2. And coating the back coating liquid prepared from the mixed raw materials of the back coating on the lower surface of the substrate layer through an anilox roller. The technical scheme comprises embodiments 1-6, embodiment 16, embodiments 23-26 and embodiments 28-31.
Furthermore, in the brightening structure layer, the height of an isosceles triangle is 25 μm, the angle of the top angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 3 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The particle size is 120-150nm, and the dosage (also called content) is 3-4% of that of the adhesive resin (such as polyester acrylic resin). The above technical solutions include embodiment 2 and embodiment 23.
Further, in the brightening structure layer, the substrate layer is PET with the thickness of 188 um; the back coating comprises 19-25% of solvent type ultraviolet curing acrylic resin glue, 1-3% of acrylic (polymethyl methacrylate) particles, 3-5 μm of acrylic particles in particle size and 72-80% of solvent, wherein the solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating raw material is coated on the substrate layer through a anilox roller. The above technical solutions include embodiment 2 and embodiment 23.
The preparation method of the high-luminance wide-viewing-angle brightness enhancement film provided by the invention comprises the following steps of:
(1) uniformly mixing solvent-free ultraviolet curing polyester acrylic resin glue and inorganic oxide particles;
(2) coating the mixture obtained in the step (1) on one surface of a substrate layer through a structure roller, stamping a microstructure, and curing the microstructure under the irradiation of UV light to obtain a prism structure layer;
(3) mixing solvent type ultraviolet curing resin glue, acrylic particles and a solvent to prepare back coating liquid;
(4) and coating the back coating liquid on the other surface of the substrate layer through an anilox roller, baking the substrate layer through an oven, and curing the back coating under the irradiation of UV light.
Compared with the existing brightness enhancement film, the brightness enhancement film provided by the invention has the characteristics of higher luminance performance, high scratch resistance, wide viewing angle and the like, and has excellent comprehensive performance; the high-brightness wide-view-angle brightness enhancement film provided by the invention can effectively solve the problems of serious energy consumption, insufficient brightness, assembly scratch, small view angle and the like of a display after being applied to a backlight module.
Drawings
FIG. 1 is a schematic view of a structure of a high brightness wide viewing angle brightness enhancement film according to the present invention.
Detailed Description
For a better understanding of the technical aspects of the present invention, the following detailed description of the present invention is given in conjunction with the accompanying drawings and specific examples.
As shown in fig. 1, the present invention provides a high brightness wide viewing angle brightness enhancement film, which comprises a brightness enhancement structure layer 1, a substrate layer 2 and a back coating layer 3 in sequence.
The preparation method of the high-luminance wide-viewing-angle brightness enhancement film provided by the invention comprises the following steps of:
(1) uniformly mixing solvent-free ultraviolet curing polyester acrylic resin glue and inorganic oxide particles;
(2) coating the mixture obtained in the step (1) on one surface of a substrate layer through a structure roller, stamping a microstructure, and curing the microstructure under the irradiation of UV light to obtain a prism structure layer;
(3) mixing solvent type ultraviolet curing resin glue, acrylic particles and a solvent to prepare back coating liquid;
(4) and coating the back coating liquid on the other surface of the substrate layer through an anilox roller, baking the substrate layer through an oven, and curing the back coating under the irradiation of UV light.
The testing method of the brightness enhancement film provided by the invention comprises the following steps:
1. brightness of the brightness enhancement film: the test conditions were performed according to JJG 2033-. The luminance test was carried out by using a brightness enhancement film 5AD2 produced by Taiwan Brightness (E-Fun) as a control, and calculating the ratio of the luminance to the control as the luminance gain, with the luminance of the control being 100%. The higher the luminance gain, the better the brightness enhancement effect of the brightness enhancement film.
2. Visual angle: and an EZCrast visual angle measuring instrument is adopted, and the test condition is executed according to the standard YD/T1067.
3. Scratch resistance: the MGW-001 scratch resistance tester is adopted, and the test conditions are executed according to GB/T2918. Higher measured weight values indicate better scratch resistance of the brightness enhancing film.
Example 1
The invention provides a high-brightness wide-viewing-angle brightness enhancement film, which sequentially comprises a brightness enhancement structure layer, a substrate layer and a back coating layer; the brightening structure layer is a prism structure, the cross section of the prism structure is an isosceles triangle, and the vertex angle of the isosceles triangle is an arc. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 80% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 2
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 3 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, 5 microns of acrylic particles and 80% of solvent, wherein the solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 3
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 140 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19 percent of solvent type ultraviolet curing acrylic resin glue and acrylic (polymethyl methacrylate) particles1% of acrylic particles, the particle size of the acrylic particles is 7 microns, 80% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 4
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 100nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 39% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 60% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 5
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The particle size is 200nm, and the content of the particles is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 39% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, 5 microns of acrylic particles and 60% of solvent, wherein the solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 6
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The particle size is 150nm, and the content of the particles is 4 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 39% of solvent type ultraviolet curing acrylic resin glue and acrylic (polymethyl methacrylate) particles1 percent, 7 mu m of acrylic particles and 60 percent of solvent, wherein the solvent comprises butanone, toluene and propylene glycol monomethyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 7
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the vertex angle of the isosceles triangle is 90 degrees, and the radius of the circular arc is 3 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 31.99% of solvent type ultraviolet curing acrylic resin glue, 0.01% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 68% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 8
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the vertex angle of the isosceles triangle is 90 degrees, and the radius of the circular arc is 4 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 31.99% of solvent type ultraviolet curing acrylic resin glue, 0.01% of acrylic (polymethyl methacrylate) particles, 5 mu m of acrylic particles and 68% of solvent, wherein the mass ratio of the solvent to the back coating is 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 9
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 0 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 31.99 percent of solvent type ultraviolet curing acrylic resin glue and acrylic (polymethyl methacrylate)Ester) particles 0.01%, acrylic particles with the particle size of 7 μm, 68% of solvent comprising butanone, toluene and propylene glycol monomethyl ether in the mass ratio of 1:1:2, and coating the mixed back coating layer on the substrate layer through an anilox roller.
Example 10
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 1 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 31.9% of solvent type ultraviolet curing acrylic resin glue, 0.1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 68% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 11
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 4 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 31.9% of solvent type ultraviolet curing acrylic resin glue, 0.1% of acrylic (polymethyl methacrylate) particles, 5 mu m of acrylic particles and 68% of solvent, wherein the mass ratio of the solvent to the back coating is 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 12
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 60 degrees, and the radius of the circular arc is 4 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 31.9 percent of solvent type ultraviolet curing acrylic resin glue and acrylic (polymethyl methacrylate)Methyl acrylate) particles 0.1%, acrylic particles with a particle size of 7 μm, a solvent 68%, wherein the solvent comprises butanone, toluene and propylene glycol monomethyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 13
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 60 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 19% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 80% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 14
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the vertex angle of the isosceles triangle is 90 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 19% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, 5 microns of acrylic particles and 80% of solvent, wherein the solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 15
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 60 degrees, and the radius of the circular arc is 3 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 19 percent of solvent type ultraviolet curing acrylic resin glue and acrylic (polymethyl methacrylate)Methyl acrylate) particles 1%, acrylic particles 7 μm in particle size, a solvent 80%, the solvent comprising butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 16
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the vertex angle of the isosceles triangle is 140 degrees, and the radius of the circular arc is 3 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 39% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 60% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 17
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 39% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, 5 microns of acrylic particles and 60% of solvent, wherein the solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 18
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 39% of solvent type ultraviolet curing acrylic resin glue and acrylic (polymethyl methacrylate)Methyl acrylate) particles 1%, acrylic particles 7 μm in particle size, solvent 60%, solvent comprising butanone, toluene, propylene glycol methyl ether in a mass ratio of 1:1:2, and coating the mixed back coating layer on the substrate layer through an anilox roller.
Example 19
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the human apex angle of the isosceles triangle is 120 degrees, and the arc radius is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 31.99% of solvent type ultraviolet curing acrylic resin glue, 0.01% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 68% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 20
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 31.99% of solvent type ultraviolet curing acrylic resin glue, 0.01% of acrylic (polymethyl methacrylate) particles, 5 mu m of acrylic particles and 68% of solvent, wherein the mass ratio of the solvent to the back coating is 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 21
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 20 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 150nm, and the content of the grain diameter is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 31.99 percent of solvent type ultraviolet curing acrylic resin glue,0.01% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 7 microns, 68% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 22
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 30 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The particle size is 200nm, and the content of the particles is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 31.9% of solvent type ultraviolet curing acrylic resin glue, 0.1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 68% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 23
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 3 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 120nm, and the content of the grain diameter is 4 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 25% of solvent type ultraviolet curing acrylic resin glue, 3% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 72% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 24
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2The particle size of TiO is 150nm, and the content of the TiO is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19 percent of solvent type ultraviolet curing acrylic resin glue and acrylic (acrylic) gluePolymethyl methacrylate) particles 1%, acrylic particles with the particle size of 1 μm, a solvent 80%, wherein the solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 25
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2The particle size of TiO is 150nm, and the content of the TiO is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 20 microns, 80% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 26
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 30 μm, the angle of the vertex angle of the isosceles triangle is 140 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The grain diameter is 120nm, and the content of the grain diameter is 4 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 250 um. The back coating comprises 25% of solvent type ultraviolet curing acrylic resin glue, 3% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 72% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 27
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 0.5 μm; the brightening structure layer comprises inorganic oxide particles TiO2The particle size of TiO is 150nm, and the content of the TiO is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19 percent of solvent type ultraviolet curing polyester resin glue and acrylic (polymethyl methacrylate) particles1 percent, the grain diameter of acrylic particles is 3 mu m, the solvent comprises butanone, toluene and propylene glycol methyl ether with the mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 28
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 20 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2The particle size of TiO is 150nm, and the content of the TiO is 3 percent of that of the polyester acrylic resin. The substrate layer is PET with a thickness of 220 um. The back coating comprises 19% of solvent type ultraviolet curing acrylic resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 80% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 29
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2The particle size of TiO is 150nm, and the content of the TiO is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19% of solvent type ultraviolet curing polyethylene resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 80% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Example 30
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2The particle size of TiO is 150nm, and the content of the TiO is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19 percent of solvent type ultraviolet curing polyvinyl chloride resin glue, 1 percent of acrylic (polymethyl methacrylate) particles, and the particle diameter of the acrylic particles is3 mu m, 80 percent of solvent comprising butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and coating the mixed back coating on the substrate layer through an anilox roller.
Example 31
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 25 μm, the angle of the vertex angle of the isosceles triangle is 120 degrees, and the radius of the circular arc is 2 μm; the brightening structure layer comprises inorganic oxide particles TiO2The particle size of TiO is 150nm, and the content of the TiO is 3 percent of that of the polyester acrylic resin. The substrate layer was PET with a thickness of 188 um. The back coating comprises 19% of solvent type ultraviolet curing polyurethane resin glue, 1% of acrylic (polymethyl methacrylate) particles, the particle size of the acrylic particles is 3 mu m, 80% of solvent comprises butanone, toluene and propylene glycol methyl ether in a mass ratio of 1:1:2, and the mixed back coating is coated on the substrate layer through an anilox roller.
Comparative example 1
A brightness enhancing film as provided in example 1. Wherein the height of the isosceles triangle is 15 μm, the angle of the vertex angle of the isosceles triangle is 50 degrees, and the radius of the circular arc is 5 μm.
Comparative example 2
A brightness enhancing film as provided in example 1. Wherein the radius of the arc is 6 μm; the height of the isosceles triangle is 35 μm, and the angle of the apex angle of the isosceles triangle is 150 °.
Comparative example 3
The brightness enhancing film as provided in example 1, wherein the inorganic oxide particles in the brightness enhancing layer material have a particle size of 50nm and are present in an amount of 3% of the polyester acrylic resin.
Comparative example 4
The brightness enhancing film as provided in example 1, wherein the particle size of the inorganic oxide particles in the brightness enhancing layer material is 250nm and the content thereof is 1% of the polyester acrylic resin.
Comparative example 5
The brightness enhancing film as provided in example 1, wherein the content of the inorganic oxide particles in the brightness enhancing layer material is 6% of the polyester acrylic resin.
Control sample
Brightness enhancement film 5AD2, manufactured by Taiwan Brightness enhancement (E-Fun).
TABLE 1 structural parameters of the Brightness enhancing Structure layers of examples 1-31 and comparative examples 1-5 and the technical characteristics of the inorganic oxide particles
TABLE 2 test results of the performance of the brightness enhancement films provided in the comparative examples, examples 1-31 and comparative examples 1-5
As shown in tables 1 and 2, the brightness enhancement films provided in examples 1-6, 16, 23-26 and 28-31 have a luminance gain of at least 100.4%, a viewing angle of at least 112 °, and a scratch resistance of at least 800g, and can achieve high luminance, wide viewing angle and scratch resistance, with good overall performance. In particular, examples 2 and 23 are the most preferred embodiments of the present invention, the luminance gain is at least 101.6%, the viewing angle reaches 124 °, and the scratch resistance load is at least 900 g.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the disclosure of the present invention are covered by the scope of the claims of the present invention.
Claims (2)
1. The high-brightness wide-viewing-angle brightness enhancement film is characterized by comprising a brightness enhancement structure layer, a substrate layer and a back coating layer in sequence; the brightening structure layer comprises adhesive resin and inorganic oxide particles, wherein the adhesive resin is selected from solvent-free ultraviolet curing resin, and the refractive index of the solvent-free ultraviolet curing resin in the brightening structure layer is 1.51-1.55;
the brightening structure layer is a prism structure layer, the cross section of the prism structure layer comprises connected isosceles triangles, and the vertex angle of each isosceles triangle is an arc; the height of an isosceles triangle in the brightening structure layer is 20-30 microns, the angle of the top angle of the isosceles triangle is 120-140 degrees, and the radius of the circular arc is 2-3 microns; the brightening structure layer comprises inorganic oxide particles TiO2，TiO2The particle size is 100-200nm, the dosage of the particles is 3-4% of the adhesive resin, and the percentage is weight percentage;
the wide viewing angle brightness enhancement film has a viewing angle of at least 112 °.
2. The film as claimed in claim 1, wherein the substrate layer of the brightness enhancing structure layer is PET with a thickness of 188-250 μm; the back coating comprises 19-39% of solvent type ultraviolet curing acrylic resin glue, 1-3% of acrylic particles, 3-7 μm of acrylic particles and 60-80% of solvent.
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