CN110908026A - Single-layer PET (polyethylene terephthalate) reflective film and backlight module - Google Patents
Single-layer PET (polyethylene terephthalate) reflective film and backlight module Download PDFInfo
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Abstract
The invention discloses a single-layer PET (polyethylene terephthalate) reflecting film and a backlight module, wherein the reflecting film comprises a PET substrate, and two end surfaces of the PET substrate are defined as a light incident side and a backlight side; the bottom coating is coated on the light incident side of the PET substrate; a metal reflecting layer, which is vacuum plated on the bottom coating; the protective layer comprises a first protective coating arranged on the metal reflecting layer and a second protective coating arranged on the first protective coating, and the refractive index of the first protective coating is greater than that of the second protective coating; wherein the thickness of the PET substrate is 50-300 μm, the thickness of the bottom coating is 0.5-1.5 μm, the thickness of the metal reflecting layer is 160-320 nm, the thickness of the first protective coating is 3-8 μm, the refractive index n is 1.50-1.55, the thickness of the second protective coating is 2-5 μm, and the refractive index n is 1.47-1.50.
Description
Technical Field
The invention relates to the technical field of optical films, in particular to a single-layer PET (polyethylene terephthalate) reflecting film and a backlight module.
Background
The reflector plate reflects unscattered light sources and then enters the light conduction region, the reflection mode of the reflector plate is mirror reflection, and the utilization rate of light is improved through the mirror reflection.
Referring to fig. 1, an optical reflective sheet is commercially available in the art, and the reflective sheet is formed by sputtering a metallic silver reflective material on a primer layer of a PET substrate and then coating a protective coating layer thereon. Firstly, because the protective coating is not in place, the metal silver coating can be affected by the temperature and the humidity of the environment to generate oxidation discoloration, thereby affecting the reflection efficiency of the reflector plate; secondly, the quality of the reflector plate is influenced by the thickness of the metal silver reflecting material, when the thickness of the metal silver reflecting layer is not enough, the metal silver cannot form effective reflection on the PET substrate, so that the incident light penetrates through the silver layer and is emitted from one side of the reflector plate, which is far away from the incident light, so that the light utilization rate is reduced, and when the thickness of the metal silver reflecting layer is thicker, the production cost of the reflector plate is increased due to the high price of the metal silver.
Fig. 2 shows a reflector structure (designated as GF-80D2) which has been mass-produced currently by the creator of the prior art, the reflector comprises a PET bottom mold, the bottom mold is plated with an aluminum film, an adhesive layer (the thickness of the adhesive layer is set to be 3 to 5 μm) is arranged on the aluminum film, then a silver film is arranged on the adhesive layer, and finally a PET top mold layer is arranged on the silver layer. Light enters from the PET top film layer of the reflector plate, and is reflected when passing through the PET top film layer, so that the incident light is reduced, and the light loss is serious. In practice, the PET bottom film plated with the aluminum film and the PET top film plated with the silver film are attached, and when the silver film and the aluminum film are attached, the problem that two pieces of PET film are easily warped due to different shrinkage rates of the metal films is also solved, and the warping problem is enhanced along with the reduction of the thickness of the PET film.
In order to solve the problems, the prior art adopts a glue-free continuous metal coating design (vacuum coating), so that effective shielding can be formed, the laminating process is reduced in design, and the thickness of a silver layer can be reduced.
However, the optical reflective sheet designed by adopting the glue-free continuous metal coating has the main problems that: how to protect the silver reflecting layer, namely effectively prevent the silver reflecting layer from being oxidized.
Therefore, the present inventor has designed a single-layer PET reflective film that uses an organic coating to protect the metal reflective layer and does not block the incident light and the emergent light, in combination with the requirement of the production process.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a single-layer PET reflective film that protects a metal reflective layer by an organic coating and does not block incident light and outgoing light, in view of the above-mentioned drawbacks of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme that the single-layer PET reflecting film comprises:
the two end faces of the PET substrate are defined as a light incident side and a backlight side; the bottom coating is coated on the light incident side of the PET substrate; a metal reflecting layer, which is vacuum plated on the bottom coating; the protective layer comprises a first protective coating arranged on the metal reflecting layer and a second protective coating arranged on the first protective coating, and the refractive index of the first protective coating is greater than that of the second protective coating; wherein the thickness of the PET substrate is 50-300 μm, the thickness of the bottom coating is 0.5-1.5 μm, the thickness of the metal reflecting layer is 120-320 nm, the thickness of the first protective coating is 3-8 μm, the refractive index n is 1.50-1.55, the thickness of the second protective coating is 2-5 μm, and the refractive index n is 1.47-1.53.
As a further elaboration of the above technical solution,
in the above technical solution, the first protective coating is a hardened coating of one of the cyclic olefin copolymer TOPAS 9506F-04, cyclic olefin copolymer TOPAS 8007F-400, cyclic olefin copolymer TOPAS6013F-04, and cyclic olefin copolymer TOPAS 8007F-600.
In the technical scheme, the second protective coating is a UV-7600B hard optical film with viscosity of 2000-4000 mPa & s/25 ℃, molecular weight of 1400MW, pencil hardness of 3H and curing shrinkage of 6.3% or a UV-7640B hard optical film with viscosity of 2000-5000 mPa & s/25 ℃, molecular weight of 1500MW, pencil hardness of 3H-4H and curing shrinkage of 6.6% or a UV-7630B plastic hard coating with viscosity of 3000-7000 mPa & s/25 ℃, molecular weight of 2200MW, pencil hardness of 3H and curing shrinkage of 6.4%.
In the technical scheme, the base coat is a hardened coat of one of cyclic olefin copolymer TOPAS 9506F-04, cyclic olefin copolymer TOPAS 8007F-400, cyclic olefin copolymer TOPAS6013F-04 and cyclic olefin copolymer TOPAS 8007F-600.
In the technical scheme, the metal reflecting layer comprises a thickness compensation layer evaporated or sputtered on the bottom coating and a silver reflecting layer evaporated or sputtered on the thickness compensation layer, wherein the thickness of the thickness compensation layer is 60-200 nm, and the thickness of the silver reflecting layer is 60-120 nm.
In the above technical solution, the thickness compensation layer is an aluminum metal layer deposited or sputtered on the undercoat layer, or a titanium metal layer deposited or sputtered on the undercoat layer, or an aluminum-titanium alloy layer sputtered on the undercoat layer.
In the above technical solution, the thickness of the PET substrate is 75 μm, the thickness of the primer layer is 1 μm, the thickness of the thickness compensation layer is 150nm, the thickness of the silver reflective layer is 80nm, the thickness of the first protective coating is 5 μm, the refractive index n is 1.53, the thickness of the second protective coating is 3 μm, and the refractive index n is 1.5.
In the above technical scheme, the metal reflective layer is a pure silver reflective layer.
In the above technical solution, the thickness of the PET substrate is 75 μm, the thickness of the primer layer is 1 μm, the thickness of the pure silver reflective layer is 150nm, the thickness of the first protective coating is 5 μm, the refractive index n thereof is 1.53, the thickness of the second protective coating is 3 μm, and the refractive index n thereof is 1.5.
In order to solve the technical problem, another technical scheme adopted by the invention is that the backlight module comprises a back plate, a light source, a light guide plate and a reflecting film which are sequentially arranged, wherein the reflecting film is the single-layer PET reflecting film.
Compared with the prior art, the reflective film has the beneficial effects that the reflective film has the advantages that the bottom coating is arranged on the PET substrate, and the metal reflective layer is arranged on the bottom coating and compensates light leakage; through set up by first protective layer (high refractive index layer) and second protective layer (low refractive index layer) on the reflector layer, the refracting index of first protective layer and second protective layer is close, when protecting metal reflector layer not oxidized, improves visible penetration (income light), also does not prevent the reflection and pierces through (light-emitting).
Drawings
FIG. 1 is a structural view of a conventional PET reflector sheet;
FIG. 2 is a schematic structural diagram of a conventional reflector plate;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
fig. 4 is another structural view of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiments described by referring to the drawings are exemplary and intended to be used for explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
Example 1
Referring to fig. 3, a single layer PET reflective film, comprising:
a PET substrate 100, wherein two end faces of the PET substrate 100 are defined as a light incident side 001 and a backlight side 002; in practice, the PET substrate can be selected from transparent, white, black and gray PET;
a primer layer 200 coated on the light incident side of the PET substrate 100; in practice, the primer layer 200 with good ductility is needed to be used, when the whole reflector is cut into a single reflector by using a cutting machine, the primer layer 200 will laterally cover the reflective layer 300 on the primer layer 200, so as to prevent the main reflective layer of the reflective layer 300 from being oxidized, and meanwhile, the primer layer 200 also has the function of performing gas and water resistance on the PET substrate 100; in this embodiment, the primer layer 200 is a hardened coating of one of olefin copolymer TOPAS 9506F-04, cycloolefin copolymer TOPAS 8007F-400, cycloolefin copolymer TOPAS6013F-04, and cycloolefin copolymer TOPAS 8007F-600;
a metal reflective layer 300, vacuum-plated on the base coat layer 200, in this embodiment, the metal reflective layer 300 is a pure silver reflective layer;
a protective layer 400 comprising a first protective coating 401 disposed on the metal reflective layer 300 and a second protective coating 402 disposed on the first protective coating 401, wherein the refractive index of the first protective coating 401 is greater than the refractive index of the second protective coating 402;
wherein, the thickness of the PET substrate 100 is 50-300 μm, preferably 75 μm, the thickness of the bottom coating layer 200 is 0.5-1.5 μm, preferably 1.0 μm, the thickness of the metal reflection layer 300 is 120-320 nm, preferably 230nm, the thickness of the first protective coating layer 401 is 3-8 μm, preferably 5 μm, the refractive index n is 1.50-1.55, preferably 1.53, the thickness of the second protective coating layer 402 is 2-5 μm, preferably 3 μm, the refractive index n is 1.47-1.50, preferably 1.5.
It should be noted that, in the embodiment, the first protective coating 401 and the second protective coating 402 are combined to form an antireflection layer by matching the first protective coating 401 and the second protective coating 402, which is helpful for improving visible light transmittance and also does not prevent reflection transmittance, in the embodiment, the difference between the high refractive index and the low refractive index of the first protective layer 401 and the second protective layer 402 is reduced, that is, the refractive indexes of the reflection transmittance of the first protective layer 401 and the second protective layer 402 are balanced, so as to realize the oxidation and hardening of the first protective layer 401 and the second protective layer 402 for protecting the metal reflective layer 300, in the embodiment, the reflection or the increase of light of the reflective sheet by the first protective layer 401 and the second protective layer 402 is not emphasized, but the incident light antireflection is generated by the difference between the high refractive index and the low refractive index of the two protective layers by using the principle of the antireflection dual-layer 401 and the second protective layer 402; regarding the refractive indices of the first protective coating layer 401 and the second protective coating layer 402, when the refractive index of the second protective coating layer 402 is changed according to the change of the refractive index of the first protective coating layer 401, that is, when the first protective coating layer 401 having a small refractive index is selected, the refractive index of the second protective coating layer 402 is also selected to be relatively small, and in practice, the difference between the refractive indices of the first protective coating layer 401 and the second protective coating layer 402 is selected to be 0.2 to 0.3.
It is understood that in this embodiment, the first protective coating 401 is a hardened coating of one of the cyclic olefin copolymers TOPAS 9506F-04, TOPAS 8007F-400, TOPAS6013F-04, and TOPAS 8007F-600. In the present example, the water vapor permeability (38 ℃, 90% RH) of the first protective layer 401 after curing is 0.85g · 100 μm/(m ℃) by coating the metallic silver reflective layer 300 to form a protective layer, wherein the cycloolefin copolymer is a COC material2·day)。
It can be understood that, in the present embodiment, to achieve the high hardness and low shrinkage performance of the second protective layer 402, the second protective layer 402 may be selected from a UV-7600B hard optical film with viscosity of 2000-4000 mPa · s/25 ℃, molecular weight of 1400MW, pencil hardness of 3H, curing shrinkage of 6.3%, a UV-7600B hard optical film with viscosity of 2000-5000 mPa · s/25 ℃, molecular weight of 1500MW, pencil hardness of 3H-4H, curing shrinkage of 6.6%, and a UV-7640B plastic hard coating with viscosity of 3000-7000 mPa · s/25 ℃, molecular weight of 2200MW, pencil hardness of 3H, curing shrinkage of 6.4%; the hard optical film and the plastic hard coating are both products of Mitsubishi SHIKOH hard film series, and in practice, other hard films with high hardness and low shrinkage rate can be satisfied.
Example 2
Referring to fig. 4, a single layer PET reflective film includes:
a PET substrate 100, wherein two end faces of the PET substrate 100 are defined as a light incident side 001 and a backlight side 002; in practice, the PET substrate can be selected from transparent, white, black and gray PET;
a primer layer 200 coated on the light incident side of the PET substrate 100; in practice, the primer layer 200 with good ductility is needed to be used, when the whole reflector is cut into a single reflector by using a cutting machine, the primer layer 200 will laterally cover the reflective layer 300 on the primer layer 200, so as to prevent the main reflective layer of the reflective layer 300 from being oxidized, and meanwhile, the primer layer 200 also has the function of performing gas and water resistance on the PET substrate 100; in this embodiment, the primer layer 200 is a hardened coating of one of olefin copolymer TOPAS 9506F-04, cycloolefin copolymer TOPAS 8007F-400, cycloolefin copolymer TOPAS6013F-04, and cycloolefin copolymer TOPAS 8007F-600;
a metal reflective layer 300, vacuum-plated on the bottom coating 200, wherein the metal reflective layer 300 comprises a thickness compensation layer 301 evaporated or sputtered on the bottom coating 200 and a silver reflective layer 302 evaporated or sputtered on the thickness compensation layer 301;
a protective layer 400 comprising a first protective coating 401 disposed on the metal reflective layer 300 and a second protective coating 402 disposed on the first protective coating 401, wherein the refractive index of the first protective coating 401 is greater than the refractive index of the second protective coating 402;
wherein, the thickness of the PET substrate 100 is 50-300 μm, preferably 75 μm, the thickness of the bottom coating layer 200 is 0.5-1.5 μm, preferably 1.0 μm, the thickness of the thickness compensation layer 301 is 60-200 nm, preferably 150nm, the thickness of the silver reflection layer 302 is 60-120 nm, preferably 80nm, the thickness of the first protective coating layer 401 is 3-8 μm, preferably 5 μm, the refractive index n thereof is 1.50-1.55, preferably 1.53, the thickness of the second protective coating layer 402 is 2-5 μm, preferably 3 μm, the refractive index n thereof is 1.47-1.50, preferably 1.5.
It should be noted that, in the embodiment, the first protective coating 401 and the second protective coating 402 are combined to form an antireflection layer by matching the first protective coating 401 and the second protective coating 402, which is helpful for improving visible light transmittance and also does not prevent reflection transmittance, in the embodiment, the difference between the high refractive index and the low refractive index of the first protective layer 401 and the second protective layer 402 is reduced, that is, the refractive indexes of the reflection transmittance of the first protective layer 401 and the second protective layer 402 are balanced, so as to realize the oxidation and hardening of the first protective layer 401 and the second protective layer 402 for protecting the metal reflective layer 300, in the embodiment, the reflection or the increase of light of the reflective sheet by the first protective layer 401 and the second protective layer 402 is not emphasized, but the incident light antireflection is generated by the difference between the high refractive index and the low refractive index of the two protective layers by using the principle of the antireflection dual-layer 401 and the second protective layer 402; regarding the refractive indices of the first protective coating layer 401 and the second protective coating layer 402, when the refractive index of the second protective coating layer 402 is changed according to the change of the refractive index of the first protective coating layer 401, that is, when the first protective coating layer 401 having a small refractive index is selected, the refractive index of the second protective coating layer 402 is also selected to be relatively small, and in practice, the difference between the refractive indices of the first protective coating layer 401 and the second protective coating layer 402 is selected to be 0.2 to 0.3.
It is understood that in this embodiment, the first protective coating 401 is a hardened coating of one of the cyclic olefin copolymers TOPAS 9506F-04, TOPAS 8007F-400, TOPAS6013F-04, and TOPAS 8007F-600. Wherein, theThe cycloolefin copolymer is a COC material, and in this embodiment, the cycloolefin copolymer is coated on the metallic silver reflective layer 300 as a protective film, and in this embodiment, the water vapor transmission rate (38 ℃, 90% RH) of the first protective layer 401 after curing is 0.85 g.100 μm/(m m.2·day)。
It can be understood that, in the present embodiment, to achieve the high hardness and low shrinkage performance of the second protective layer 402, the second protective layer 402 may be selected from a UV-7600B hard optical film with viscosity of 2000-4000 mPa · s/25 ℃, molecular weight of 1400MW, pencil hardness of 3H, curing shrinkage of 6.3%, a UV-7600B hard optical film with viscosity of 2000-5000 mPa · s/25 ℃, molecular weight of 1500MW, pencil hardness of 3H-4H, curing shrinkage of 6.6%, and a UV-7640B plastic hard coating with viscosity of 3000-7000 mPa · s/25 ℃, molecular weight of 2200MW, pencil hardness of 3H, curing shrinkage of 6.4%; the hard optical film and the plastic hard coating are both products of Mitsubishi SHIKOH hard film series, and in practice, other hard films with high hardness and low shrinkage rate can be satisfied.
It is understood that in the present embodiment, the activity of silver is lower than that of other metals or alloys, so that silver does not have higher activity than that of other metals at the anode position, and oxidation is suppressed, and the thickness of the silver layer is compensated and light leakage is compensated, and the thickness compensation layer 301 is an aluminum layer deposited or sputtered on the undercoat layer 200, a titanium layer deposited or sputtered on the undercoat layer 200, or an aluminum-titanium alloy layer sputtered on the undercoat layer 200.
In practice, the reflective sheets of the PET substrate, thickness compensation layer, silver reflective layer and protective layer with different thicknesses in this example were irradiated on a glass substrate with light of 550nm wavelength, and the reflectivity and luminance were measured and compared with the reflective sheet of model GF-80D2 produced by mass production by the applicant of the present application as follows (in the table, coc represents the first protective layer, uv represents the second protective layer):
the high-temperature storage test and the cold-heat shock oxidation test are carried out on the reflector plates with the thicknesses as follows: (test A)
120h of various temperature and humidity resistances, wherein 0 represents no oxidation, 1 represents slight oxidation, and 2 represents severe oxidation;
the test conditions are the in-line specification of optical films for LCD backlight modules, and refer to GB/T1740-2007 or ISO4611: 2010.
The test process of the 60 ℃ 95% RH high temperature and high humidity test is as follows: performing high-temperature and high-humidity test by using a high-temperature furnace, and continuously testing for 120 hours at the temperature of 60 ℃ and the relative humidity of 95% RH; performing high-temperature storage test at 80 ℃, and performing high-temperature storage test for 120 hours by adopting a high-temperature furnace;
the hot and cold impact test oxidation refers to IEC 60068-2-14:2009Na or GB/T2423.22-2012 Na, and the reflector plate is operated once at the temperature of-40 ℃ and 80 ℃ at intervals of 30min for 100 continuous tests.
Wherein GF-80D2 is a photoelectric product, and has a structure that a PET silver-plated film (25 μm) is attached to a 50 μm PET aluminum-plated film by 3-5 μm polyurethane. The pencil hardness test refers to GB 6739-86 coating hardness pencil hardness method.
The PET emission films of the above respective thicknesses were subjected to a high-temperature storage test (test B):
240h, temperature and humidity resistance, wherein 0 represents no oxidation, 1 represents slight oxidation, and 2 represents severe oxidation;
the test conditions are the in-line specification of optical films for LCD backlight modules, and refer to GB/T1740-2007 or ISO4611: 2010.
The test process of the 60 ℃ 95% RH high temperature and high humidity test is as follows: performing high-temperature and high-humidity test by using a high-temperature furnace, and continuously testing for 240 hours at the temperature of 60 ℃ and the relative humidity of 95% RH; performing high-temperature storage test at 80 ℃, and performing high-temperature storage test for 240 hours by adopting a high-temperature furnace;
wherein GF-80D2 is a photoelectric product, and has a structure that a PET silver-plated film (25 μm) is attached to a 50 μm PET aluminum-plated film by 3-5 μm polyurethane. The pencil hardness test refers to GB 6739-86 coating hardness pencil hardness method.
And (3) testing C:
the temperature and humidity resistance of various types is 500h, wherein 0 represents no oxidation, 1 represents slight oxidation, and 2 represents severe oxidation;
the test conditions are the in-line specification of optical films for LCD backlight modules, and refer to GB/T1740-2007 or ISO4611: 2010.
The test process of the 60 ℃ 95% RH high temperature and high humidity test is as follows: performing high-temperature and high-humidity test by using a high-temperature furnace, and continuously testing for 500 hours at the temperature of 60 ℃ and the relative humidity of 95% RH; performing high-temperature storage test at 80 ℃, and performing high-temperature storage test for 500 hours by adopting a high-temperature furnace;
wherein GF-80D2 is a photoelectric product, and has a structure that a PET silver-plated film (25 μm) is attached to a 50 μm PET aluminum-plated film by 3-5 μm polyurethane. The pencil hardness test refers to GB 6739-86 coating hardness pencil hardness method.
Based on the above examples and test results, it can be seen that the single-layer reflective sheet of the present invention compensates for light leakage by providing an undercoat layer on a PET substrate and a metal reflective layer on the undercoat layer; through set up by first protective layer (high refractive index layer) and second protective layer (low refractive index layer) on the reflector layer, the refracting index of first protective layer and second protective layer is close, when protecting metal reflector layer not oxidized, improves visible penetration (income light), also does not prevent the reflection and pierces through (light-emitting).
The invention further provides an embodiment, and the backlight module comprises a back plate (not shown in the attached drawing), a light source (not shown in the attached drawing), a light guide plate (not shown in the attached drawing) and a reflective film, which are sequentially arranged, wherein the reflective film is the single-layer PET reflective film described in embodiment 1 or embodiment 2.
The technical scope of the present invention is not limited to the above embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.
Claims (10)
1. A single layer PET reflective film comprising:
the two end faces of the PET substrate are defined as a light incident side and a backlight side;
the bottom coating is coated on the light incident side of the PET substrate;
a metal reflecting layer, which is vacuum plated on the bottom coating;
the protective layer comprises a first protective coating arranged on the metal reflecting layer and a second protective coating arranged on the first protective coating, and the refractive index of the first protective coating is greater than that of the second protective coating; wherein the content of the first and second substances,
the thickness of the PET substrate is 50-300 mu m, the thickness of the bottom coating is 0.5-1.5 mu m, the thickness of the metal reflecting layer is 160-320 nm, the thickness of the first protective coating is 3-8 mu m, the refractive index n is 1.50-1.55, the thickness of the second protective coating is 2-5 mu m, and the refractive index n is 1.47-1.50.
2. The single-layer PET reflective film of claim 1, wherein the first protective coating is a hardened coating of one of the cyclic olefin copolymers TOPAS 9506F-04, cyclic olefin copolymer TOPAS 8007F-400, cyclic olefin copolymer TOPAS6013F-04, and cyclic olefin copolymer TOPAS 8007F-600.
3. The single-layer PET reflective film according to claim 2, wherein the second protective coating is a UV-7600B hard optical film with viscosity of 2000-4000 mPa-s/25 ℃, molecular weight of 1400MW, pencil hardness of 3H and curing shrinkage of 6.3% or a UV-7630B plastic hard coating with viscosity of 2000-5000 mPa-s/25 ℃, molecular weight of 1500MW, pencil hardness of 3H-4H and curing shrinkage of 6.6% or a UV-7640B hard optical film with viscosity of 3000-7000 mPa-s/25 ℃, molecular weight of 2200MW, pencil hardness of 3H and curing shrinkage of 6.4%.
4. The single-layer PET reflective film of claim 3, wherein the primer layer is a hardened coating of one of the group consisting of cycloolefin copolymer TOPAS 9506F-04, cycloolefin copolymer TOPAS 8007F-400, cycloolefin copolymer TOPAS6013F-04, and cycloolefin copolymer TOPAS 8007F-600.
5. The single-layer PET reflective film according to claim 4, wherein the metal reflective layer comprises a thickness compensation layer deposited or sputtered on the primer layer and a silver reflective layer deposited or sputtered on the thickness compensation layer, wherein the thickness of the thickness compensation layer is 60-200 nm, and the thickness of the silver reflective layer is 60-120 nm.
6. The single-layer PET reflective film according to claim 5, wherein the thickness compensation layer is an aluminum metal layer evaporated or sputtered on the undercoat layer, a titanium metal layer evaporated or sputtered on the undercoat layer, or an aluminum-titanium alloy layer sputtered on the undercoat layer.
7. The single-layer PET reflective film as claimed in claim 6, wherein the PET substrate has a thickness of 75 μm, the primer layer has a thickness of 1 μm, the thickness compensation layer has a thickness of 150nm, the silver reflective layer has a thickness of 80nm, the first protective coating has a thickness of 5 μm and has a refractive index n of 1.53, and the second protective coating has a thickness of 3 μm and has a refractive index n of 1.5.
8. The single-layer PET reflective film according to claim 4, wherein the metal reflective layer is a pure silver reflective layer.
9. The single-layer PET reflective film as claimed in claim 8, wherein the PET substrate has a thickness of 70 μm, the primer layer has a thickness of 1 μm, the pure silver reflective layer has a thickness of 150nm, the first protective coating has a thickness of 5 μm and has a refractive index n of 1.53, and the second protective coating has a thickness of 3 μm and has a refractive index n of 1.5.
10. A backlight module comprising a back plate, a light source, a light guide plate and a reflective film, wherein the reflective film is the single-layer PET reflective film of claim 7 or 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312069A (en) * | 2020-04-03 | 2020-06-19 | 武汉华星光电技术有限公司 | Backlight plate, preparation method thereof and backlight module |
-
2019
- 2019-12-26 CN CN201911367216.0A patent/CN110908026A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312069A (en) * | 2020-04-03 | 2020-06-19 | 武汉华星光电技术有限公司 | Backlight plate, preparation method thereof and backlight module |
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