TW201634954A - Multi-function optical film - Google Patents

Abstract

A multi-function optical film is provided, including: a first optical film; a second optical film; and an optically clear adhesive binding the first optical film and the second optical film, wherein the first optical film includes a first fluorescent layer and a first light diffusion layer on opposite sides of a first substrate, and the first light diffusion layer faces away the optically clear adhesive; wherein the second optical film includes a second light diffusion layer disposing on a second substrate and the second light diffusion layer faces away the optically clear adhesive.

Description

Composite optical film

This invention relates to composite optical films, and more particularly to composite optical films having a phosphor layer.

Optical film refers to a film that achieves the desired optical properties by changing the transmission characteristics of light waves, such as transmission, reflection, absorption, scattering, polarization, spectral and phase changes of light. In any of the optical instruments or optoelectronic devices of the present day, the application of optical films can be found almost everywhere. In recent years, the rise of flat-panel displays has not only greatly increased the demand for optical films, but also gradually led to the market trend of optical films.

In general, the optical film may include a diffusion film, a prism film (also referred to as a brightness enhancement film), a light guide plate (LGP), a reflector, etc., which can scatter light. Uniformly transferred to the entire panel to eliminate the effects of uneven light or to mask some optical defects (such as uneven moiré traces), direct the light to the viewer's desired angle of view, and borrow The microstructure increases the brightness of the light source to reflect light to increase the efficiency of use of the light source; or, the use of a fluorescent luminescent material or quantum dot material to increase color saturation or increase brightness increases energy efficiency.

The composite optical film refers to a multifunctional optical film in which the above various optical films and/or other functional layers are integrated, and the integrated composite optical film is integrated. A single diaphragm provides better optical performance, significantly reduces film thickness, labor costs and yield and yield, and reduces inventory and purchase management complexity for overall system simplification and cost control Has a significant effect. With the development of display and / or lighting technology, in order to meet the needs of lightweight, thin and high-performance devices, functional integrated optical film has become a new development focus.

Embodiments of the present invention form a composite optical film by using an optical adhesive bonding optical film, which can achieve a simplified process, is applied to a display, a naming device, etc., and has improved color saturation or increased composite The light extraction efficiency of the optical film reduces the thickness of the device.

An embodiment of the present invention provides a composite optical film comprising: a first optical film; a second optical film; and an optical adhesive, the first optical film and the second optical film, wherein the first optical film includes the first The phosphor layer and the first light diffusion layer are respectively located on opposite sides or the same side of the first substrate, wherein the first light diffusion layer is located away from one side of the optical glue, and wherein the second optical film comprises the second light diffusion layer is located at the second side On the substrate, and the second light diffusion layer is located away from one side of the optical glue.

According to another embodiment of the present invention, the composite optical film further includes: a second phosphor layer disposed on a side of the second substrate opposite to the second light diffusion layer, and the optical glue is interposed between the first phosphors Between the layer and the second phosphor layer.

10, 20‧‧‧Composite optical film

100‧‧‧First optical film

110‧‧‧First substrate

120‧‧‧First light diffusion layer

130‧‧‧First fluorescent layer

200a, 200b‧‧‧second optical film

210‧‧‧Second substrate

220‧‧‧Second light diffusion layer

230‧‧‧Second fluorescent layer

300‧‧‧Optical adhesive

1 is a schematic cross-sectional view of a composite optical film according to an embodiment of the invention.

2 is a schematic cross-sectional view of a composite optical film according to another embodiment of the present invention.

3 is a schematic cross-sectional view of a composite optical film according to still another embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view showing a composite optical film according to a comparative example.

The structure and fabrication of the embodiments of the present invention are described below. The embodiments of the present invention provide many suitable inventive concepts and can be widely implemented in various specific contexts. The specific embodiments disclosed are merely illustrative of the invention, and are not intended to limit the scope of the invention.

It is to be understood that the following disclosure of the specification provides a number of different embodiments or examples to implement various features of the invention. The disclosure of the present specification is a specific example of the various components and their arrangement in order to simplify the description of the invention. However, these specific examples are not intended to limit the invention. For example, if the disclosure of the present specification describes the formation of the first feature on or above the second feature, that is, it includes an embodiment in which the first feature is in direct contact with the second feature; Additional features may be formed between the first feature and the second feature, such that the first feature and the second feature may not be in direct contact with each other.

Furthermore, in the description, relative terms such as: "lower", "higher", "above", "below", "above", "below", "upper", "lower", "top" "," "bottom" and its derivatives (for example: "down", "up", etc.), should be based on subsequent descriptions Or the orientation shown in the figures of the discussion. These relative terms are convenient to describe and not to limit the device to be constructed or operated in a particular orientation.

According to conventional practice, various features in the drawings are not drawn to scale. Show. Conversely, the dimensions of various features may be arbitrarily expanded or reduced for simplicity or convenience of labeling. Furthermore, different examples in the description of the invention may use repeated reference symbols and/or words. These repeated symbols or words are not intended to limit the relationship between the various embodiments and/or the appearance structures for the purpose of simplicity and clarity.

a composite optical film known to the inventors that will fluoresce The layer and the optical film are integrated into a single film layer and can be used to adjust the light color or convert the color light. However, such a composite optical film requires multiple coating and curing of the phosphor layer in the process to obtain the desired thickness of the phosphor layer, thereby causing problems such as complicated process, long manufacturing time, and difficulty in controlling the tube.

In view of this, the present invention provides a composite containing a fluorescent layer. Optical film, which is formed by bonding with optically clear adhesive (OCA), which can increase light scattering, primary and secondary light excitation efficiency, in addition to simplifying the process and reducing the thickness of the film. It can also improve the light extraction efficiency of the composite optical film. It should be noted that the phosphor layer described in the present invention comprises a phosphor layer formed of a fluorescent material or a quantum dot material, and also includes a composite light-emitting material layer formed of a composite light-emitting material, hereinafter simply referred to as a "fluorescent layer".

1 shows a composite optical film 10 according to an embodiment of the present invention. Schematic diagram of the structure. Referring to FIG. 1 , the composite optical film 10 includes a first optical film 100 , a second optical film 200 a , and an optical adhesive 300 . The first optical film 100 includes: a first substrate 110, a first light diffusion layer 120, and a first phosphor layer 130, wherein The first light diffusion layer 120 and the first light diffusion layer 130 are respectively disposed on opposite sides of the first substrate 110; the second optical film 200a includes: the second light diffusion layer 220 is disposed on the second substrate 210; The optical adhesive 300 is used to bond the first optical film 100 and the second optical film 200a.

As shown in FIG. 1 , the first optical film 100 is bonded by the optical adhesive 300 and After the second optical film 200a, the first light diffusion layer 120 of the first optical film 100 and the second light diffusion layer 220 of the second optical film 200a are respectively located away from one side of the optical adhesive 300. That is, after the first optical film 100 and the second optical film 200a are bonded by the optical adhesive 300, the optical adhesive 300 is interposed between the first fluorescent layer 130 and the second substrate 210. In one embodiment, the optical adhesive 300 is bonded to the first fluorescent layer 130 of the first optical film 100 and the second substrate 210 of the second optical film 200a.

The method for producing the composite optical film of the present invention will be described in detail below. this The method for manufacturing a composite optical film containing a fluorescent layer can separately form two optical films, and then optically bonding the two optical films to complete the composite optical film, or can be from top to bottom (or from below) Up) An optical film, an optical adhesive layer, and an optical film are sequentially formed to complete the composite optical film. Hereinafter, a method of manufacturing the composite optical film 10 of the present invention will be described by taking a process in which two optical films are bonded via optical glue as an example.

First, the first optical film 100 and the second optical film are separately fabricated. 200a. In one embodiment, the first light diffusion layer 120 and the first phosphor layer 130 are respectively formed on opposite sides of the first substrate 110 to obtain the first optical film 100. On the other hand, the second light diffusion layer 220 is formed on one side of the second substrate 210 to obtain the second optical film 200a.

The first light diffusion layer 120 and the first fluorescent light can be adjusted according to requirements The order of layers 130. In an embodiment, the shape is formed on a side of the first substrate 110. The first light diffusion layer 120 is formed on the opposite side, and the first phosphor layer 130 is formed on the opposite side. In another embodiment, the first phosphor layer 130 is formed on one side of the first substrate 110, and the first light diffusion layer 120 is formed on the opposite side. In another embodiment, the first light diffusion layer 120 is formed on one side of the first substrate 110, and the first phosphor layer 130 is formed on the same side.

The substrate is used to provide support for each film layer, or it can be used as a guarantee The sheath is insulated from air or moisture. The first substrate 110 and the second substrate 210 may be the same material or different materials. In some embodiments, the first substrate 110 and the second substrate 210 may be water-oxygen barrier films. In some embodiments, the first substrate 110 and the second substrate 210 each comprise: a glass, a release film, a polymer film, or a metal film or a functional film. For example, specific examples of the first substrate 110 and the second substrate 210 include: glass, thin glass (thickness of about 20-40 μm), silicone release film, fluorine release film, cycloolefin polymer ( Cyclic olefin copolymer (COC), polyimide (PI), polyethylene terephthalate (PET), polyethylene (polyethylene), polypropylene (polypropylene), polycarbonate Polycarbonate (PC), copper film, or aluminum film.

In some embodiments, the first substrate 110 and the second substrate 210 The thickness is between 20 and 200 μm. For example, the thickness of the first substrate 110 and the second substrate 210 is between 30 and 100 μm.

Light diffusing layer can evenly distribute light and increase primary light and fluorescence Scattering in the film and preventing sticking. The first light diffusion layer 120 and the second light diffusion layer 220 may be the same light diffusion layer or different light diffusion layers. In some embodiments, the first light diffusion layer 120 and the second light diffusion layer 220 each comprise a light diffusing agent And matrix materials. In some embodiments, the light diffusing agent is comprised of a high refractive index material. In some embodiments, the material of the light diffusing agent comprises: glass, polymethyl methacrylate (PMMA), polystyrene (PS), cerium oxide (SiO2), antimony trioxide (Si2O3), barium sulfate, Calcium carbonate, magnesium oxide, titanium dioxide (TiO2) or aluminum oxide (Al2O3). In some embodiments, the matrix material comprises a polymeric material. For example, the matrix material includes a mono- or polyfunctional polymer or a condensation polymer [functional groups include imine, silicon, amino, carboxylic acid, phosphate ( Phosphonate) etc.]. For example, the matrix material includes: polyethylene (PE), polypropylene (PP), polycarbonate (PC), polymethyl methacrylate (PMMA), or epoxy (epoxy). , cerium oxide (SiO 2 ), antimony trioxide (Si 2 O 3 ).

In some embodiments, the first light diffusion layer 120 and the second light diffusion The layers 220 each further include one or more micro-textures to reduce total internal reflection or to increase light extraction. For example, the micro-textures include: periodic or irregular bevels, prisms, embossed grooves, semi-circles, circles, Or photonic crystals, etc. One or more microtextures can be formed by any suitable means. In some embodiments, one or more microtextures may be formed via embossing, knife etching, spraying or etching.

In some embodiments, the first light diffusion layer 120 and the second light diffusion The thickness of layer 220 is between 0.5 and 100 μm. For example, the thickness of the first light diffusion layer 120 and the second light diffusion layer 220 is between 0.5 and 70 μm.

The light diffusing layer can be formed by any suitable means. In some real In the embodiment, the desired light diffusion layer pattern may be formed first, and then cured to form the first light diffusion layer 120 and the second light diffusion layer 220. Method of forming a light diffusion layer pattern Includes: coating, printing, spraying, transfer or embossing. For example, the coating methods that can be used to form the first light diffusion layer 120 and the second light diffusion layer 220 include: die coating, blade coating, and roller coating. , dip coating, or spray coating; printing methods that can be used to form the first light diffusion layer 120 and the second light diffusion layer 220 include: screen printing, flexographic printing (flexography printing, FLEXO), gravure printing, relief printing, or planographic printing; curing methods that can be used to form the first light diffusion layer 120 and the second light diffusion layer 220 include: UV curing or heat curing.

The phosphor layer can be used to adjust the color or convert the color. In some implementations In one example, the first phosphor layer 130 includes one or more photoluminescent materials and a host material. The first phosphor layer 130 can also include a light scattering or light extraction material. In some embodiments, the photoluminescent material comprises: a phosphor or quantum dot. . In some embodiments, the matrix material comprises a polymeric material. For example, the matrix material includes a mono- or polyfunctional polymer or a condensation polymer [functional groups include imine, silicon, amino, carboxylic acid, phosphate ( Phosphonate) etc.]. For example, the matrix material includes: polyethylene (PE), polypropylene (PP), polycarbonate (PC), polymethyl methacrylate (PMMA), or epoxy (epoxy). .

For example, specific embodiments of the phosphor may include: sulfide Fluorescent powder, such as: zinc sulfide (ZnS), cadmium sulfide (CdS), barium sulfide (SrS), calcium sulfide (CaS); phosphorophosphoric acid phosphor powder, such as: calcium halophosphate; phosphate phosphor powder, such as: Barium phosphate (Sr2P2O7), barium phosphate (Ba2P2O7), calcium zinc phosphate [(Ca,Zn)3(PO4)2]; citrate phosphor powder, such as: zinc citrate (Zn2SiO4), calcium citrate (CaSiO3) Tungstate phosphor powder, such as: magnesium tungstate (MgWO4), calcium tungstate (CaWO4); aluminate phosphor powder, such as: barium magnesium aluminate (BaMg2Al16O27), barium magnesium aluminate (CeMgAl11O19), aluminum Strontium strontium (Sr4Al14O25); yttrium oxide (Y2O3), or lanthanum oxide (La2O3).

Specific examples of quantum dot materials include: silver indium sulfide (AgInS2, AIS), CuInS2, CIS, CdSe, CdS, CdTe, Zinc Sulfide (ZnS), Zinc Selenide (ZnSe), Zinc Thionide (ZnTe) ), zinc oxide (ZnO), mercury sulfide (HgS), mercury selenide (HgSe), mercury (HgTe), cadmium sulfide (CdSeS), cadmium selenide (CdSeTe), cadmium sulphide (CdSTe) ), zinc ZnSeS, ZnSeTe, ZnSTe, sulphur selenide (HgSeS), samarium sulphide (HgSeTe), sulphur sulphide (HgSTe), Cadmium zinc sulfide (CdZnS), cadmium zinc selenide (CdZnSe), cadmium zinc telluride (CdZnTe), cadmium cadmium sulfide (CdHgS), cadmium selenide (CdHgSe), cadmium telluride (CdHgTe), zinc sulphide ( HgZnS), HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS , selenium cadmium mercury (CdHgSeTe), cadmium cadmium mercury (CdHgSTe), sulphur selenium sulphide (HgZnSeS), selenium, mercury, zinc (HgZnSeTe), sulphur, mercury, zinc (HgZnSTe), gallium nitride (GaN), phosphating GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, Indium nitride (InN), indium phosphide (InP), indium arsenide (InAs), indium antimonide (InSb), gallium phosphide (GaNP), gallium arsenide (GaNAs), gallium arsenide (GaNSb), gallium arsenide (GaPAs), Gallium Phosphide (GaPSb), aluminum phosphide (AlNP), aluminum arsenide (AlNAs), aluminum arsenide (AlNSb), aluminum arsenide (AlPAs), aluminum phosphide (AlPSb), indium phosphide (InNP), indium arsenide (InNAs) ), InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb , AlGaAs, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, Phosphorus GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, Tin Sulfide SnS), tin selenide (SnSe), antimony telluride (SnTe), lead sulfide (PbS), lead selenide (PbSe), lead telluride (PbTe), tin selenide (SnSeS), selenium telluride ( SnSeTe), sulphur telluride (SnSTe), lead sulphide sulphide (PbSeS), lead selenide telluride (PbSeTe), lead bismuth sulphide (PbSTe), lead sulphide sulphide (SnPbS), lead seledium selenide (SnPbSe), Lead-tin (SnPbTe), sulfur-selenide-lead-tin (SnPbSSe), selenium, lead, tin (SnPbSeTe), bismuth (Si), germanium (Ge), tantalum carbide (SiC), germanium (SiGe), manganese zinc selenide (ZnMnSe), Gallium phosphide (GaAsP), aluminum gallium indium phosphide (AlGaInP), indium gallium aluminum nitride (AlGaInN), or gallium phosphide: nitrogen (GaP: N).

The phosphor layer can be formed by any suitable means. In some implementations In an example, the first phosphor layer 130 can be formed by coating or printing a desired phosphor layer pattern and then curing. For example, the coating method that can be used to form the first phosphor layer 130 includes: die coating, blade coating, roller coating, and dip coating. ) or spray coating; printing methods that can be used to form the first phosphor layer 130 include: screen printing, flexography printing, FLEXO), gravure printing, relief printing, or planographic printing; curing methods that can be used to form the first phosphor layer 130 include: UV curing or thermal curing.

If the thickness of the phosphor layer is too thick, thickness unevenness is likely to occur in the process. Problems such as poor optical effects; if the thickness of the phosphor layer is too thin, the desired fluorescent effect may not be achieved. Thus, in some embodiments, the first phosphor layer 130 can be a single layer or a multilayer structure to achieve the desired thickness. In some embodiments, the first phosphor layer 130 has a thickness between 5 and 200 μm. For example, the thickness of the first phosphor layer 130 is between 30 and 180 μm.

After forming the first optical film 100 and the second optical film 200a, The first fluorescent layer 130 of the first optical film 100 and the second substrate 210 of the second optical film 200a are bonded together using the optical adhesive 300 to obtain a composite optical film 10.

In some embodiments, coating and curing prior to other substrates The optical adhesive 300 is bonded to the first optical film 100 and the second optical film 200a via the optical adhesive 300 to obtain the composite optical film 10. In some embodiments, the optical adhesive 300 is coated and cured directly on the first fluorescent layer 130 of the first optical film 100 or directly on the second light diffusion layer 220 of the second optical film 200a, and then Another optical film is bonded to obtain a composite optical film 10.

In some embodiments, the optical glue 300 is a clear optical glue. Example For example, the optical adhesive 300 includes: an organic silicone rubber, an acrylic optical adhesive, an unsaturated polyester optical adhesive, or a polyurethane optical adhesive. In some embodiments, the coating method that can be used to form the optical adhesive 300 includes: die coating, blade coating, roller coating, dip coating. Or spray coating; can be used to form optical glue 300 The curing method includes: UV curing or heat curing.

In the process, the optical glue is too thin, the bonding operation is not easy; the optical glue Too thick, it may cause optical interference lines, affecting the light output. In some embodiments, the optical adhesive 300 has a thickness between 5 and 150 μm. For example, the thickness of the optical adhesive 300 is between 10 and 70 μm.

2 is a diagram showing a composite optical film 20 according to an embodiment of the present invention. Schematic diagram of the structure. Referring to FIG. 2, the composite optical film 20 includes a first optical film 100, a second optical film 200b, and an optical adhesive 300. The composite optical film 20 is substantially the same as the composite optical film 10 except that the second optical film 200b of the composite optical film 20 includes, in addition to the second substrate 210 and the second light diffusion layer 220, a second The phosphor layer 230 is disposed, and the second phosphor layer 230 is located on one side toward the second substrate 210.

As shown in FIG. 2, the first optical film 100 is bonded to the optical adhesive 300 and After the second optical film 200b, the first light diffusion layer 120 of the first optical film 100 and the second light diffusion layer 220 of the second optical film 200a are respectively located away from one side of the optical adhesive 300. That is, after the first optical film 100 and the second optical film 200a are bonded by the optical adhesive 300, the optical adhesive 300 is interposed between the first fluorescent layer 130 and the second fluorescent layer 230. In one embodiment, the optical adhesive 300 bonds the first phosphor layer 130 of the first optical film 100 and the second phosphor layer 230 of the second optical film 200a.

The composite optical film 20 can be fabricated in a similar manner to the composite optical film 10. First, the first optical film 100 and the second optical film 200b are separately produced. In one embodiment, the first light diffusion layer 120 and the first phosphor layer 130 are respectively formed on opposite sides of the first substrate 110 to obtain the first optical film 100. On the other hand, the second light diffusion layer 220 and the second surface are respectively formed on opposite sides of the second substrate 210. The second phosphor layer 230 obtains the second optical film 200b. Next, the first optical film 100 and the second optical film 200b are bonded together by the optical adhesive 300 to obtain a composite optical film 20.

The first optical film 100 and the optical adhesive in the composite optical film 20 300, which can be manufactured in a similar manner to the corresponding film layers in the foregoing composite optical film 10, and the detailed description thereof will not be repeated here.

The first phosphor layer 130 and the second phosphor layer 230 may be the same fluorescent Layer or different phosphor layers. In an embodiment, the second phosphor layer 230 of the second optical film 200b can be fabricated in a manner similar to the first phosphor layer 130 of the first optical film 100, and details are not described herein again. In some embodiments, the thickness of the second phosphor layer 230 is between 5 and 180 μm. For example, the thickness of the second phosphor layer 230 is between 10 and 150 μm.

The second light diffusion layer 220 and the second fluorescent light can be adjusted according to requirements The order of layers 230. In one embodiment, the second light diffusion layer 220 is formed on one side of the second substrate 210, and the second phosphor layer 230 is formed on the opposite side. In another embodiment, the second phosphor layer 230 is formed on one side of the second substrate 210, and the second light diffusion layer 220 is formed on the opposite side.

In some embodiments, the first phosphor layer in the second optical film 200b 130 and second phosphor layer 230 each comprise one or more photoluminescent materials. In some embodiments, the first phosphor layer 130 and the second phosphor layer 230 in the second optical film 200b are each a single layer or a multi-layer bonding structure.

Figure 3 illustrates a composite optical film 30 in accordance with an embodiment of the present invention. Schematic diagram of the structure. Referring to FIG. 3, the composite optical film 30 includes a first optical film 100, a second optical film 200b, and an optical adhesive 300. The first optical film 100 sequentially includes: a first substrate 110, a first light diffusion layer 120, and a first phosphor layer 130, The first light diffusion layer 120 and the first fluorescent layer 130 are disposed on the same side of the first substrate 110. The second optical film 200b includes the second substrate 210, the second light diffusion layer 220, and the second optical film 200b. The second light-emitting layer 230 and the second light-emitting layer 230 are disposed on the same side of the second substrate 210; and the optical adhesive 300 is used to bond the first optical film 100 and the second optical film. 200b.

Composites can be made in a similar manner to composite optical film 10/20 Optical film 30. First, the first optical film 100 and the second optical film 200b are separately produced. In one embodiment, the first light diffusion layer 120 and the first phosphor layer 130 are sequentially formed on the same side of the first substrate 110 to obtain the first optical film 100. On the other hand, the second light diffusion layer 220 and the second phosphor layer 230 are sequentially formed on the same side of the second substrate 210 to obtain the second optical film 200b. Next, the first optical film 100 and the second optical film 200b are bonded together by the optical adhesive 300 to obtain a composite optical film 30. In one embodiment, the optical adhesive 300 is bonded to the first phosphor layer 130 of the first optical film 100 and the second phosphor layer 230 of the second optical film 200b.

Each of the composite optical films 30 can pass through the aforementioned composite light Manufacturing is performed in a similar manner to the corresponding film layers in Film 10/20, and the detailed description thereof will not be repeated here.

The invention forms a composite type by attaching an optical film to an optical adhesive The optical film can effectively reduce the use of the phosphor layer material under the same thickness without affecting the characteristics of the phosphor layer, or reduce the thickness of the phosphor layer, and can reduce the coating, printing process and curing times to simplify the process. In addition, since the phosphor layer material is different from the optical glue material (the optical properties are different), the laminated structure formed by the phosphor layer and the optical glue also has the effect of increasing the light refraction or scattering, thereby increasing the primary light and the light diffusion and scattering. Reuse of primary and secondary light, increase brightness, chroma, color Saturation or improved light efficiency.

The composite optical film of the invention can be applied to display and illumination Equipment or optoelectronic products, etc. For example, the composite optical film of the present invention can be applied to display panels, notebooks, televisions or LED products and the like.

Embodiment 1

Referring to FIG. 2 and FIG. 4, FIG. 2 is a composite optical film 20 according to an embodiment of the present invention, and FIG. 4 is a composite optical film 40 of a comparative example, compared with the composite optical film 20. The composite optical film 40 of the comparative example does not contain the adhesive layer 300, and the other film layer structure is the same as that of the composite optical film 20.

It can be seen from the brightness test results that the composite optical film 20 added with the optical adhesive 300 helps to increase the brightness, color saturation, and light transmission, reflection, and absorption of the fluorescent layer 130/230 compared to the composite optical film 40. And scattering, therefore, the brightness of the composite optical film can be improved by the addition of the optical adhesive 300, which is an effect of the present invention.

It is to be understood that the present invention is not limited by the scope of the present invention, and the scope of the present invention is intended to be A few changes and modifications are made, and the scope of the invention is defined by the scope of the appended claims.

20‧‧‧Composite optical film

100‧‧‧First optical film

110‧‧‧First substrate

120‧‧‧First light diffusion layer

130‧‧‧First fluorescent layer

200b‧‧‧Second optical film

210‧‧‧Second substrate

220‧‧‧Second light diffusion layer

230‧‧‧Second fluorescent layer

300‧‧‧Optical adhesive

Claims (10)

A composite optical film comprising: a first optical film; a second optical film; and an optical adhesive, the first optical film and the second optical film, wherein the first optical film comprises a first fluorescent film The layer and the first light diffusion layer are respectively located on opposite sides of a first substrate, and the first light diffusion layer is located away from one side of the optical glue; wherein the second optical film comprises a second light diffusion layer located at On the second substrate, the second light diffusion layer is located away from one side of the optical glue. The composite optical film of claim 1, further comprising: a second phosphor layer on the side of the second substrate opposite to the second light diffusion layer, and the optical adhesive is interposed Between the first phosphor layer and the second phosphor layer. The composite optical film of claim 1, wherein the first substrate and the second substrate are water-oxygen barrier films. The composite optical film of claim 1, wherein the first substrate and the second substrate each comprise: a glass, a release film, a polymer film, or a metal film. The composite optical film of claim 1, wherein the first light diffusion layer and the second light diffusion layer each comprise a light diffusing agent, and the light diffusing agent comprises: glass, polymethyl methacrylate Ester (PMMA), polystyrene (PS), cerium oxide (SiO ₂ ), barium sulfate, or calcium carbonate, magnesium oxide. The composite optical film of claim 1, wherein the first light diffusion layer and the second light diffusion layer each comprise one or more micro-patterns And the one or more micro-textures include: bevels, ridges, embossed grooves, semi-circular, circular, or photonic crystals. The composite optical film of claim 1, wherein the optical adhesive is a transparent optical adhesive. The composite optical film of claim 1, wherein the optical adhesive comprises: an organic silicone rubber, an acrylic optical adhesive, an unsaturated polyester optical adhesive, or a polyurethane optical adhesive. The composite optical film of claim 1 or 2, wherein the first fluorescent layer and the second fluorescent layer are each a single layer or a multilayer structure. The composite optical film of claim 1 or 2, wherein the first fluorescent layer and the second fluorescent layer each comprise one or more photoluminescent materials, and the one or more photoluminescence Materials include: phosphor powder or quantum dots.