TWM524484U - High performance brightness enhancement film - Google Patents

Abstract

A novel brightness enhancement film is provided. The high performance brightness enhancement film includes a cholesteric liquid crystal layer, and a quarter wave film. The cholesteric liquid crystal layer has a first surface and a second surface. The quarter wave film is disposed on the first surface of the cholesteric liquid crystal layer and directly contacts with the cholesteric liquid crystal layer, wherein the quarter wave film is with surface microstructure and the surface microstructure is disposed on the upper surface of a side of the quarter wave film.

Description

High efficiency brightening film

The novel creation is related to an optical film, and in particular to a high efficiency brightness enhancing film.

In recent years, with the widespread use of electronic products, displays for electronic products to provide display functions have been the focus of designers. Among them, the liquid crystal display (LCD) has the advantages of thin thickness, high image quality, low power consumption, no radiation, and the like, and becomes the mainstream of the display. In general, a liquid crystal display is composed of a backlight module and a liquid crystal display panel. Since the liquid crystal display panel is a non-self-illuminating type panel, the backlight module is required to provide a light source to achieve a display function.

However, at present, the total brightness of the liquid crystal display can only reach 4% to 6% of the light intensity provided by the light source, and the dichroic polarizer (dichroic polarizer) which is only allowed to pass the linearly polarized light in a certain direction in the liquid crystal display panel is One of the main causes of loss of light intensity. Therefore, how to convert the light provided by the light source into linearly polarized light that can penetrate the polarizer element to improve the light use efficiency of the LCD is an important subject to be solved by those skilled in the art.

The novel creation provides a high efficiency brightness enhancement film that can be applied to a backlight module to improve light conversion efficiency.

The novel creation provides another high-efficiency brightness enhancement film that can be applied to a backlight module to improve light conversion efficiency and thereby increase the color saturation of the display.

The high-efficiency brightness enhancement film created by the present invention includes a cholesteric liquid crystal layer and a 1/4 wavelength retardation film. The cholesteric liquid crystal layer has a first surface and a second surface. The 1/4 wavelength retardation film is disposed on the first surface of the cholesteric liquid crystal layer and is in direct contact with the cholesteric liquid crystal layer, wherein the 1/4 wavelength retardation film has a surface microstructure, and the surface microstructure is disposed on the 1/4 wavelength retardation film side On the upper surface.

In an embodiment of the present invention, the material of the 1/4 wavelength retardation film comprises a discotic liquid crystal, a rod-like liquid crystal, or a rod-like liquid crystal doped with a palmitic molecule, wherein the palmitic molecule is added in a solid content. 0.01~3.0%.

In an embodiment of the present invention, the high-efficiency brightness enhancing film further includes a protective layer disposed on the second surface of the cholesteric liquid crystal layer.

In an embodiment of the present invention, the surface microstructure includes a columnar structure, a curved columnar structure, a double lens structure, a conical structure, a pyramidal structure, a microlens structure, or a combination thereof.

In an embodiment of the present invention, at least one of the above-described 1/4 wavelength retardation film and surface microstructure includes a light conversion material.

The high-efficiency brightness enhancement film created by the present invention includes a cholesteric liquid crystal layer, an interposer, and a 1/4 wavelength retardation film. The cholesteric liquid crystal layer has a first surface and a second surface. The interposer is disposed on the first surface of the cholesteric liquid crystal layer. The 1/4 wavelength retardation film is disposed on the interposer, wherein the 1/4 wavelength retardation film has a surface microstructure, and the surface microstructure is disposed on the upper surface of the 1/4 wavelength retardation film side. A light conversion material is included in at least one of the 1/4 wavelength retardation film, the surface microstructure, and the interposer.

In an embodiment of the present invention, the material of the 1/4 wavelength retardation film comprises a discotic liquid crystal, a rod-like liquid crystal, or a rod-like liquid crystal doped with a palmitic molecule, wherein the palmitic molecule is added in a solid content. 0.01~3.0%.

In an embodiment of the present invention, the high-efficiency brightness enhancing film further includes a protective layer disposed on the second surface of the cholesteric liquid crystal layer.

In an embodiment of the present invention, the surface microstructure includes a columnar structure, a curved columnar structure, a double lens structure, a conical structure, a pyramidal structure, a microlens structure, or a combination thereof.

In an embodiment of the present invention, the material of the interposer includes urethane, acrylate, epoxy, methacrylate, and light conversion material. Or a combination thereof.

Based on the above, the novel high-efficiency brightness enhancement film sequentially includes a cholesteric liquid crystal layer and a 1/4 wavelength retardation film, wherein the cholesteric liquid crystal layer is in direct contact with the 1/4 wavelength retardation film and the 1/4 wavelength retardation film has a surface microstructure. Therefore, when the high-efficiency brightness enhancement film is applied to the backlight module in the display, the light conversion efficiency of the backlight module can be effectively improved. In addition, another high-efficiency brightness enhancement film created by the present invention sequentially includes a cholesteric liquid crystal layer, an interposer, and a 1/4 wavelength retardation film, wherein the 1/4 wavelength retardation film has a surface microstructure and an interposer, 1/4 wavelength retardation. At least one of the film and the surface microstructure includes a light conversion material, thereby applying the high efficiency brightness enhancement film to the backlight module in the display, thereby effectively improving the light conversion efficiency of the backlight module and improving the display Color saturation.

The above described features and advantages of the present invention will become more apparent and understood.

1 is a perspective view of a high efficiency brightness enhancing film in accordance with an embodiment of the present invention.

Referring to FIG. 1, the high efficiency brightness enhancement film 100 includes a cholesteric liquid crystal layer 102, a 1/4 wavelength retardation film 104, and a protective layer 108, wherein the 1/4 wavelength retardation film 104 has a surface microstructure 106.

As shown in FIG. 1, the cholesteric liquid crystal layer 102 has a first surface 102a and a second surface 102b, and has a function of separating circularly polarized light. In the present embodiment, the cholesteric liquid crystal for producing the cholesteric liquid crystal layer 102 may be any cholesteric liquid crystal known to those skilled in the art. Specifically, the cholesteric liquid crystal may be, for example, a cholesteric liquid crystal molecule having a spiral array structure, a nematic liquid crystal molecule doped with a chiral molecule, or a mixture of the above two kinds of liquid crystals. In one embodiment, the cholesteric liquid crystal layer 102 is made of a nematic liquid crystal molecule doped with a palmitic molecule, such as LC1057 or LC242 manufactured by BASF Corporation, and the palmitic molecule is, for example, by BASF Corporation. Produced LC756. Further, in the case where the cholesteric liquid crystal layer 102 is made of cholesteric liquid crystal molecules having a spiral arrangement structure, the cholesteric liquid crystal layer 102 may be composed of a single layer of cholesteric liquid crystal having a different pitch or a multilayer cholesteric liquid crystal layer having a different pitch. To reflect incident visible light with various wavelength ranges.

In the present embodiment, the 1/4 wavelength retardation film 104 is disposed on the first surface 102a of the cholesteric liquid crystal layer 102 and is in direct contact with the cholesteric liquid crystal layer 102. Further, in the present embodiment, the 1/4 wavelength retardation film 104 has a function of converting circularly polarized light into linearly polarized light. In detail, the material of the 1/4 wavelength retardation film 104 includes, for example, a discotic liquid crystal, a rod-like liquid crystal, or a rod-like liquid crystal doped with a palmitic molecule, wherein the amount of the palmitic molecule is about 0.01 to 3.0% of the solid content. That is, in the present embodiment, the 1/4 wavelength retardation film 104 is a polymer liquid crystal film. In one embodiment, the material of the 1/4 wavelength retardation film 104 is a rod-like liquid crystal LC1057 or LC242 manufactured by BASF Corporation. In another embodiment, the material of the 1/4 wavelength retardation film 104 is a rod-like liquid crystal LC1057 or LC242 manufactured by BASF Corporation, which incorporates a palmitic molecule LC756 manufactured by BASF Corporation.

It is worth mentioning that since the 1/4 wavelength retardation film 104 can be formed of a liquid crystal material, both the cholesteric liquid crystal layer 102 and the 1/4 wavelength retardation film 104 can be manufactured by a roll-to-roll coating process. Thereby, the productivity of the high-efficiency brightness enhancement film 100 is improved. Further, since the 1/4 wavelength retardation film 104 is in direct contact with the cholesteric liquid crystal layer 102, the 1/4 wavelength retardation film 104 is formed by directly applying a coating process on the cholesteric liquid crystal layer 102, or cholesterol. The liquid crystal layer 102 is formed by directly performing a coating process on the 1/4 wavelength retardation film 104.

From another point of view, since the 1/4 wavelength retardation film 104 can be formed of a discotic liquid crystal or a rod-like liquid crystal, a desired optical axis angle can be obtained by the alignment treatment. Specifically, the method of manufacturing the 1/4 wavelength retardation film 104 includes, for example, the following steps: First, the substrate film is wound up from the wound body of the base film. Next, the alignment treatment is performed on the base film, and the alignment treatment may be, for example, any of the alignment methods known to those skilled in the art, such as a rubbing alignment method and a photo-alignment method. Thereafter, a liquid crystal material is applied onto the substrate film subjected to the alignment treatment and subjected to a hardening treatment. From another point of view, since the 1/4 wavelength retardation film 104 can be formed of a rod-like liquid crystal doped with a palmitic molecule, the 1/4 wavelength retardation film 104 can self-adjust by the material characteristics and the alignment treatment. The required optical axis angle. In this way, the high-efficiency brightness enhancement film 100 can be directly used without further turning angles when it is to be used in combination with the polarizer, thereby enabling the cutting efficiency of the high-efficiency brightness enhancement film 100 to be increased to 90. %the above.

In addition, in the present embodiment, the 1/4 wavelength retardation film 104 includes a light conversion material 110 such as a quantum dot, a quantum rod, a quantum well, a semiconductor fluorescent material, or two or more of the above. mixture. In detail, the quantum dots 110 may be elemental or core-shell semiconductor nanoparticles, such as zinc selenide (ZnSe), zinc sulfide (ZnS), cadmium selenide (CdSe), and sulfide. Cadmium (CdS), lead selenide (PbSe), lead sulfide (PbS), silver indium sulfide (AgInS ₂ , AIS), copper indium sulfide (CuInS ₂ , CIS), cadmium telluride (CdTe), zinc telluride (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 Sulfur, selenium, mercury, cadmium, mercury (CdHgSeS), selenium, mercury, cadmium, mercury (CdHgSeTe), cadmium cadmium mercury (CdHgSTe), sulphur, selenium, mercury, zinc (HgZnSeS), samarium, mercury, zinc (HgZnSeTe), sulphur, mercury, zinc (HgZnSTe), nitridation Gallium (GaN), gallium phosphide (GaP), gallium arsenide (GaAs), gallium antimonide (GaSb), aluminum nitride (AlN), aluminum phosphide (AlP), aluminum arsenide (AlAs), aluminum telluride (AlSb), indium nitride (InN), indium phosphide (InP), indium arsenide (InAs), indium antimonide (InSb), gallium nitride phosphide (GaNP), gallium arsenide (GaNAs), nitrogen bismuth Gallium (GaNSb), gallium arsenide (GaPAs), gallium arsenide (GaPSb), aluminum phosphide (AlNP), aluminum arsenide (AlNAs), aluminum arsenide (AlNSb), aluminum arsenide (AlPAs), aluminum phosphide (AlPSb), indium phosphide (InNP), indium arsenide (InNAs), indium antimonide (InNSb), indium arsenide (InPAs), indium phosphide (InPSb) ), GaAs, GaAlNPs, GaAlNSs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP Indium arsenide GaInNAs), GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb , InAlPAs, InAlPSb, SnS, SnSe, SnTe, PbTe, S(Se) ), SeSeTe, SnSTe, lead selenide (PbSeS), lead selenide (PbSeTe), lead bismuth bismuth (PbSTe), lead sulphide (SnPbS), selenium Lead-tin (SnPbSe), lead-tin-tellide (SnPbTe), sulphur-lead-lead-tin (SnPbSSe), selenium-bismuth-lead-tin (SnPbSeTe), bismuth (Si), germanium (Ge), tantalum carbide (SiC), germanium ( SiGe), ZnMnSe, GaAsP, AlGaInP, AlGaInN, GaN: Nitrogen (GaP:N) a combination of people. In addition, specific examples of the semiconductor fluorescent material may include: sulfide phosphor powder, such as: zinc sulfide (ZnS), cadmium sulfide (CdS), barium sulfide (SrS), calcium sulfide (CaS); Such as: calcium halophosphate; phosphate phosphor powder, such as: strontium phosphate (Sr ₂ P ₂ O ₇ ), barium phosphate (Ba ₂ P ₂ O ₇ ), calcium zinc phosphate ([(Ca, Zn ₃ (PO ₄ ) ₂ ] ); phthalate phosphor powder, such as: zinc citrate (Zn ₂ SiO ₄ ), calcium silicate (CaSiO ₃ ); tungstate phosphor powder, such as: magnesium tungstate (MgWO ₄ ), tungstic acid Calcium (CaWO ₄ ); aluminate phosphor powder, such as: barium magnesium aluminate (BaMg ₂ Al ₁₆ O ₂₇ ), barium magnesium aluminate (CeMgAl ₁₁ O ₁₉ ), barium aluminate (Sr ₄ Al ₁₄ O ₂₅ ) Yttrium oxide (Y ₂ O ₃ ), or lanthanum oxide (La ₂ O ₃ ).

Further, in the present embodiment, as shown in FIG. 1, the surface microstructures 106 are disposed on the upper surface of the 1/4 wavelength retardation film 104 side. In detail, the surface microstructures 106 are disposed on the upper surface of the side of the 1/4 wavelength retardation film 104 remote from the cholesteric liquid crystal layer 102. It is worth mentioning that the surface microstructures 106 have the function of collecting light back. In particular, the surface microstructures 106 are comprised of a plurality of protrusions P, each of which has a height of between about 5 microns and 100 microns.

More specifically, in the present embodiment, the shape of the projection P is a prism. However, the novel creation is not limited to this. In other embodiments, the shape of the protrusion P may also be, but not limited to, an arcuate column, a lenticular shape, a conical shape, a pyramid shape, or a microlens shape. The arcuate column shape is, for example, a semi-cylindrical shape or an aspherical column shape. From another point of view, in the present embodiment, the bumps P are regularly arranged on the 1/4 wavelength retardation film 104. However, the novel creation is not limited to this. In other embodiments, the bumps P may also be irregularly arranged on the 1/4 wavelength retardation film 104. From another point of view, in the present embodiment, each of the protrusions P in the surface microstructures 106 has the same shape (that is, all of them are columnar). However, the novel creation is not limited to this. In other embodiments, the plurality of protrusions P in the surface microstructures 106 may have at least two different shapes. That is, the surface micro-structure 106 of the present invention may include a columnar structure, a curved columnar structure, a double lens structure, a conical structure, a pyramidal structure, a microlens structure, or a combination thereof.

In addition, the material of the surface microstructure 106 is not particularly limited as long as it is a transparent or translucent material. In particular, the material of the surface microstructures 106 can be acrylate, methacrylate, urethane, epoxy, or a combination thereof. Additionally, the material of surface microstructure 106 has a refractive index greater than that of air. In one embodiment, the material of surface microstructure 106 has a refractive index of about 1.49-1.65.

In the present embodiment, the protective layer 108 is disposed on the second surface 102b of the cholesteric liquid crystal layer 102. In detail, the material of the protective layer 108 includes, for example, acrylate, methacrylate, urethane, epoxy resin, or a combination thereof. In addition, the protective layer 108 may further include nano particles.

It should be noted that the high-efficiency brightness enhancement film 100 including the protective layer 108, the cholesteric liquid crystal layer 102, the 1/4 wavelength retardation film 104 and the surface microstructure 106 is suitable for the backlight module in the display, wherein the protective layer 108 is The light-incident side is on the light-emitting side, and the display is on the light-emitting side, and the display is, for example, a liquid crystal display or an electrowetting display. Further, by applying the high-efficiency brightness enhancement film 100 to the backlight module, not only the light conversion efficiency of the backlight module can be improved, but also the display brightness of the display can be improved, and according to the foregoing description, at least the following reasons are included: 1] The high-efficiency brightness enhancement film 100 is capable of separating the light incident from the protective layer 108 into the left-handed circularly polarized light and the right-handed circularly polarized light through the cholesteric liquid crystal layer 102, one of which can penetrate the cholesteric liquid crystal layer 102, and The other one is reflected by the cholesteric liquid crystal layer 102, thereby converting the circularly polarized light reflected by the cholesteric liquid crystal layer 102 into penetrable circularly polarized light through the reflection mechanism in the backlight module, thereby improving the utilization of the light. [2] The high-efficiency brightness enhancement film 100 is capable of converting circularly polarized light that has passed through the cholesteric liquid crystal layer 102 into a transmission axis that coincides with the transmission axis of the linearly polarizing film in the display panel by having the 1/4 wavelength retardation film 104. Linearly polarized light, thereby avoiding light loss due to light absorption of the linear polarizing film; [3] The high-efficiency brightness enhancing film 100 transmits the 1/4 wavelength retardation film 104 with a surface microstructure 106 to enable divergence The line is concentrated on the front view angle, thereby improving the light-emitting brightness of the backlight module; and [4] the high-efficiency brightness enhancement film 100 is in direct contact with the 1/4 wavelength retardation film 104 through the cholesteric liquid crystal layer 102, so that the bonding between the two There is no need to use an additional interposer, thereby avoiding light attenuation due to the interposer. In particular, in one embodiment, the display brightness of a display employing the high efficiency brightness enhancing film 100 is increased by more than 1.5 times compared to conventional displays.

In addition, the light transmissive material 110 is included in the 1/4 wavelength retardation film 104, and particularly when it absorbs light of a certain wavelength, a color light of a specific basic primary color can be emitted, thereby increasing the color saturation of the display.

Further, in the present embodiment, although the high-efficiency brightness enhancement film 100 includes the light conversion material 110 to enhance the color saturation of the display, the novel creation is not limited thereto. In other embodiments, the high efficiency brightness enhancing film 100 may not include the light converting material 110.

From another point of view, in the present embodiment, only the 1/4 wavelength retardation film 104 includes the light conversion material 110, but the novel creation is not limited thereto. In other embodiments, in the case where the high efficiency brightness enhancement film 100 includes the light conversion material 110, it may also include only the light conversion material 110 in the surface microstructure 106, or the 1/4 wavelength retardation film 104 and the surface micro The structure 106 includes a light converting material 110.

From another point of view, in the present embodiment, the light conversion material 110 is included in the 1/4 wavelength retardation film 104, that is, the light conversion material 110 is blended in the 1/4 wavelength retardation film 104, but the present invention Creation is not limited to this. In other embodiments, the light conversion material 110 can also be formed by coating or printing between the 1/4 wavelength retardation film 104 and the surface microstructure 106 and/or the 1/4 wavelength retardation film 104 and the cholesteric liquid crystal layer. The film layer between 102.

Further, in the present embodiment, the high-efficiency brightness enhancement film 100 is provided with the protective layer 108, but the creation of the present invention is not limited thereto. In other embodiments, the high-efficiency brightness enhancing film 100 may not be provided with the protective layer 108.

2 is a perspective view of a high efficiency brightness enhancing film in accordance with another embodiment of the present invention.

Referring to FIG. 2, the high efficiency brightness enhancement film 200 includes a cholesteric liquid crystal layer 202, an interposer 204, a 1/4 wavelength retardation film 206, and a protective layer 210, wherein the 1/4 wavelength retardation film 206 has a surface microstructure 208.

As shown in FIG. 2, the cholesteric liquid crystal layer 202 has a first surface 202a and a second surface 202b and has a function of separating circularly polarized light. In the present embodiment, the cholesteric liquid crystal for producing the cholesteric liquid crystal layer 202 may be any cholesteric liquid crystal known to those skilled in the art. Specifically, the cholesteric liquid crystal may be, for example, a cholesteric liquid crystal molecule having a spiral arrangement structure, a nematic liquid crystal molecule doped with a palmitic molecule, or a mixture of the above two types of liquid crystals. In one embodiment, the cholesteric liquid crystal layer 202 is made of a nematic liquid crystal molecule doped with a palmitic molecule, such as LC1057 or LC242 manufactured by BASF Corporation, and the palmitic molecule is, for example, by BASF Corporation. Produced LC756. Further, in the case where the cholesteric liquid crystal layer 202 is made of cholesteric liquid crystal molecules having a spiral array structure, the cholesteric liquid crystal layer 202 may be composed of a single layer of cholesteric liquid crystal having a different pitch or a multilayer cholesteric liquid crystal layer having a different pitch. To reflect incident visible light with various wavelength ranges.

In the present embodiment, the interposer 204 is disposed on the first surface 202a of the cholesteric liquid crystal layer 202. In detail, the interposer 204 preferably has good transparency, and its light transmittance is about 88% to 99.9%. Further, the material of the interposer 204 includes, for example, urethane, acrylate, epoxy resin, methacrylate, light conversion material, or a combination thereof; and the thickness of the interposer 204 is, for example, 1 to 50 μm.

In the present embodiment, the 1/4 wavelength retardation film 206 is disposed on the interposer 204. That is, the cholesteric liquid crystal layer 202 and the 1/4 wavelength retardation film 206 are bonded through the interposer 204. Further, in the present embodiment, the 1/4 wavelength retardation film 206 has a function of converting circularly polarized light into linearly polarized light. In detail, the material of the 1/4 wavelength retardation film 206 includes, for example, a discotic liquid crystal, a rod-like liquid crystal, or a rod-like liquid crystal doped with a palmitic molecule, wherein the palmitic molecule is added in an amount of 0.01 to 3.0% of the solid content. That is, the 1/4 wavelength retardation film 206 is a polymer liquid crystal film. In one embodiment, the material of the 1/4 wavelength retardation film 206 is a rod-like liquid crystal LC1057 or LC242 manufactured by BASF Corporation. In another embodiment, the material of the 1/4 wavelength retardation film 104 is a rod-like liquid crystal LC1057 or LC242 manufactured by BASF Corporation, which incorporates a palmitic molecule LC756 manufactured by BASF Corporation.

It is worth mentioning that since the 1/4 wavelength retardation film 206 can be formed of a liquid crystal material, both the cholesteric liquid crystal layer 202 and the 1/4 wavelength retardation film 206 can adopt a roll-to-roll coating process. Manufactured to increase the productivity of the high efficiency brightness enhancing film 200.

In addition, as described above, since the 1/4 wavelength retardation film 206 can be formed of a discotic liquid crystal or a rod-like liquid crystal, a desired optical axis angle can be obtained by the alignment treatment; and since the 1/4 wavelength retardation film 206 can be The rod-like liquid crystal is doped with a palmitic molecule, so that the 1/4 wavelength retardation film 206 can self-adjust to obtain a desired optical axis angle by material characteristics and alignment treatment. In this way, when it is to be used in combination with the polarizer for application, the high-efficiency brightness enhancement film 200 can be directly used without turning the angle, thereby enabling the cutting efficiency of the high-efficiency brightness enhancement film 200 to be increased to 90. %the above.

In addition, in the present embodiment, the 1/4 wavelength retardation film 206 includes a light conversion material 212, such as a quantum dot, a quantum rod, a quantum well, a semiconductor fluorescent material, or two or more of the above. mixture. In detail, the quantum dot 212 may be a simple or core-shell semiconductor nanoparticle, and the material thereof is, for example, zinc selenide (ZnSe), zinc sulfide (ZnS), cadmium selenide (CdSe), cadmium sulfide (CdS), Lead selenide (PbSe), lead sulfide (PbS), silver indium sulfide (AgInS ₂ , AIS), copper indium sulfide (CuInS ₂ , CIS), cadmium telluride (CdTe), zinc telluride (ZnTe), zinc oxide ( ZnO), HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe Zinc (ZnSeS), bismuth selenide (ZnSeTe), bismuth sulphide (ZnSTe), sulphide sulphide (HgSeS), samarium sulphide (HgSeTe), sulphur sulphur sulphide (HgSTe), cadmium zinc sulfide (CdZnS) CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, Selenization Mercury zinc (HgZnSe), mercury zinc hydride (HgZnTe), sulphide cadmium zinc (CdZnSeS), selenium cadmium zinc cadmium (CdZnSeTe), cadmium zinc cadmium (CdZnSTe), sulfur selenium cadmium mercury CdHgSeS), cadmium cadmium mercury (CdHgSeTe), cadmium cadmium cadmium (CdHgSTe), sulphur selenium sulphide (HgZnSeS), samarium samarium sulphide (HgZnSeTe), sulphur bismuth mercury (HgZnSTe), gallium nitride (GaN), Gallium phosphide (GaP), gallium arsenide (GaAs), gallium antimonide (GaSb), aluminum nitride (AlN), aluminum phosphide (AlP), aluminum arsenide (AlAs), aluminum telluride (AlSb), nitrogen Indium, InP, InAs, InSb, Indium Gallium Nitride (GaNP) , gallium arsenide (GaPAs), gallium arsenide (GaPSb), aluminum phosphide (AlNP), aluminum arsenide (AlNAs), aluminum arsenide (AlNSb), aluminum arsenide (AlPAs), phosphorus Aluminum halide (AlPSb), indium phosphide (InNP), indium arsenide (InNAs), indium bismuth indium (InNSb), indium arsenide (InPAs), indium phosphide (InPSb), NP Aluminum (GaAlNP), GaAs, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaAs (GaInNAs), GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, Indium Phosphide Aluminum (InAlPAs), Indium Aluminium Phosphide (InAlPSb), Tin Sulfide (SnS), Tin Selenide (SnSe), Tin Tellurium (SnTe), Lead Telluride (PbTe), Tin Selenide (SnSeS), Selenium Tin (SnSeTe), bismuth sulphide (SnSTe), lead sulphide (PbSeS), lead bismuth bismuth (PbSeTe), lead bismuth sulphide (PbSTe), lead sulphide (SnPbS), lead sulphide ( SnPbSe), lead bismuth telluride (SnPbTe), sulphur selenide lead (SnPbSSe), selenium telluride (SnPbSeTe), bismuth (Si), germanium (Ge), tantalum carbide (SiC), germanium (SiGe), selenium Manganese zinc (ZnMnSe), arsenic gallium phosphide (GaAsP), aluminum gallium indium phosphide (AlGaInP), aluminum indium gallium nitride (AlGaInN), gallium phosphide: nitrogen (GaP: N) or a combination of the two. In addition, specific examples of the semiconductor fluorescent material may include: sulfide phosphor powder, such as: zinc sulfide (ZnS), cadmium sulfide (CdS), barium sulfide (SrS), calcium sulfide (CaS); Such as: calcium halophosphate; phosphate phosphor powder, such as: strontium phosphate (Sr ₂ P ₂ O ₇ ), barium phosphate (Ba ₂ P ₂ O ₇ ), calcium zinc phosphate [(Ca, Zn) ₃ (PO ₄ ) ₂ ]; citrate phosphor powder, such as: zinc citrate (Zn ₂ SiO ₄ ), calcium citrate (CaSiO ₃ ); tungstate phosphor powder, such as: magnesium tungstate (MgWO ₄ ), calcium tungstate (CaWO ₄ ); aluminate phosphor powder, such as: barium magnesium aluminate (BaMg ₂ Al ₁₆ O ₂₇ ), barium magnesium aluminate (CeMgAl ₁₁ O ₁₉ ), barium aluminate (Sr ₄ Al ₁₄ O ₂₅ ); Yttrium oxide (Y ₂ O ₃ ), or lanthanum oxide (La ₂ O ₃ ).

Further, in the present embodiment, as shown in FIG. 2, the surface microstructure 208 is disposed on the upper surface of the 1/4 wavelength retardation film 206 side. In detail, the surface microstructure 208 is disposed on the upper surface of the 1/4 wavelength retardation film 206 on the side away from the interposer 104. It is worth mentioning that the surface microstructure 208 has the function of collecting light back. In particular, surface microstructure 208 is comprised of a plurality of protrusions 2P, wherein each protrusion 2P has a height of between about 5 microns and 100 microns.

More specifically, in the present embodiment, the shape of the projection 2P is a columnar shape. However, the novel creation is not limited to this. In other embodiments, the shape of the protrusion P may also be, but not limited to, an arcuate column shape, a double lens shape, a cone shape, a pyramid shape, or a micro lens shape, wherein the arcuate column shape is, for example, a semi-cylindrical shape or Aspherical column and the like. From another point of view, in the present embodiment, the bumps 2P are regularly arranged on the 1/4 wavelength retardation film 206. However, the novel creation is not limited to this. In other embodiments, the bumps 2P may also be irregularly arranged on the 1/4 wavelength retardation film 206. From another point of view, in the present embodiment, each of the protrusions 2P in the surface microstructure 208 has the same shape (i.e., both are columnar). However, the novel creation is not limited to this. In other embodiments, the plurality of protrusions 2P in the surface microstructure 208 may have at least two different shapes. That is, the surface micro-structure 208 of the present invention may comprise a columnar structure, a curved columnar structure, a double lenticular structure, a conical structure, a pyramidal structure, a microlens-like structure, or a combination thereof.

In addition, the material of the surface microstructure 208 is not particularly limited as long as it is a transparent or translucent material. In particular, the material of surface microstructure 208 can be acrylate, methacrylate, urethane, epoxy, or a combination thereof. Additionally, the material of surface microstructure 208 has a refractive index greater than that of air. In one embodiment, the material of surface microstructure 208 has a refractive index of about 1.49-1.65.

In the present embodiment, the protective layer 210 is disposed on the second surface 202b of the cholesteric liquid crystal layer 202. In detail, the material of the protective layer 210 includes, for example, urethane, acrylate, epoxy resin, methacrylate, or a combination thereof. In addition, the protective layer 210 may further include nano particles.

It should be noted that the high-efficiency brightness enhancement film 200 including the protective layer 210, the cholesteric liquid crystal layer 202, the interposer 204, the 1/4 wavelength retardation film 206, and the surface microstructure 208 is suitable for the backlight module in the display, wherein The protective layer 210 is located on the light incident side, and the surface microstructure 208 is located on the light exiting side, and the display is, for example, a liquid crystal display or an electrowetting display. Further, by applying the high-efficiency brightness enhancement film 200 to the backlight module, not only the light conversion efficiency of the backlight module can be improved, but also the display brightness of the display can be improved, and according to the foregoing description, at least the following reasons are included: 1] The high-efficiency brightness enhancement film 200 is capable of separating the light incident from the protective layer 210 into the left-handed circularly polarized light and the right-handed circularly polarized light through the cholesteric liquid crystal layer 202, one of which can penetrate the cholesteric liquid crystal layer 202, and The other one is reflected by the cholesteric liquid crystal layer 202, thereby converting the circularly polarized light reflected by the cholesteric liquid crystal layer 202 into a permeable circularly polarized light through a reflection mechanism in the backlight module, thereby improving the utilization of light. [2] The high-efficiency brightness enhancement film 200 is capable of converting circularly polarized light that has passed through the cholesteric liquid crystal layer 202 into a transmission axis that coincides with the transmission axis of the linearly polarizing film in the display panel by having the 1/4 wavelength retardation film 206. Linearly polarized light, thereby avoiding light loss due to light absorption of the linear polarizing film; and [3] high-efficiency brightness enhancing film 200 having a surface microstructure 208 through the 1/4 wavelength retardation film 206 enables the original Scattered light concentrated on the front angle, thereby to enhance the light brightness of the backlight module. In particular, in one embodiment, the display brightness of a display employing the high efficiency brightness enhancing film 200 is increased by more than 1.5 times compared to conventional displays.

In addition, the light transmissive material 212 is included in the 1/4 wavelength retardation film 206, and particularly when it absorbs light of a certain wavelength, a color light of a specific basic primary color can be emitted, thereby increasing the color saturation of the display.

Further, in the present embodiment, only the 1/4 wavelength retardation film 206 includes the light conversion material 212, but the present creation is not limited thereto. In other embodiments, the high efficiency brightness enhancing film 200 may also include only the interposer 204 including the light converting material 212, or only the surface microstructure 208 including the light converting material 110, or the interposer 204, 1/4 wavelength retardation. At least two of the film 206 and the surface microstructures 208 include a light converting material 212.

From another point of view, in the present embodiment, the light conversion material 212 is included in the 1/4 wavelength retardation film 206, that is, the light conversion material 212 is blended in the 1/4 wavelength retardation film 206, but the present invention Creation is not limited to this. In other embodiments, the light conversion material 212 can also be formed between the 1/4 wavelength retardation film 206 and the surface microstructure 208, between the 1/4 wavelength retardation film 206 and the interposer 204 by coating or printing. And/or a film layer between the interposer 204 and the cholesteric liquid crystal layer 202.

Further, in the present embodiment, the high-efficiency brightness enhancement film 200 is provided with the protective layer 210, but the creation of the present invention is not limited thereto. In other embodiments, the high-efficiency brightness enhancement film 200 may not be provided with the protective layer 210.

In summary, the high-efficiency brightness enhancement film created by the present invention includes a cholesteric liquid crystal layer and a 1/4 wavelength retardation film in sequence, and the cholesteric liquid crystal layer is in direct contact with the 1/4 wavelength retardation film and the 1/4 wavelength retardation film has The surface microstructure allows control of the polarization state and path of travel of light incident on the high efficiency brightness enhancing film. In this way, when the high-efficiency brightness enhancement film created by the novel is applied to the backlight module in the display, the light conversion efficiency of the backlight module can be effectively improved. In addition, another high-efficiency brightness enhancement film created by the present invention includes a cholesteric liquid crystal layer, an interposer, and a 1/4 wavelength retardation film in sequence, wherein the 1/4 wavelength retardation film has a surface microstructure, and the interposer, 1/4 The light-converting material is included in at least one of the wavelength retardation film and the surface microstructure, so that not only the polarization state and the traveling path of the light incident on the high-efficiency brightness enhancement film but also the wavelength range covered by the light can be adjusted. In this way, when the high-efficiency brightness enhancement film created by the novel is applied to the backlight module in the display, the light conversion efficiency of the backlight module can be effectively improved, and the color saturation of the display is improved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the creation of the present invention. Any person having ordinary knowledge in the art can make some changes without departing from the spirit and scope of the novel creation. Retouching, the scope of protection of this new creation is subject to the definition of the scope of the patent application attached.

100,200‧‧‧High efficiency brightening film
102, 202‧‧‧ cholesteric liquid crystal layer
102a, 202a‧‧‧ first surface
102b, 202b‧‧‧ second surface
104, 206‧‧‧1/4 wavelength retardation film
106, 208‧‧‧ surface microstructure
108, 210‧‧‧ protective layer
110, 212‧‧‧Light conversion materials
204‧‧‧Intermediary
P, 2P‧‧‧ raised

1 is a perspective view of a high efficiency brightness enhancing film in accordance with an embodiment of the present invention. 2 is a perspective view of a high efficiency brightness enhancing film in accordance with another embodiment of the present invention.

100‧‧‧High efficiency brightening film

102‧‧‧Cholesterol liquid crystal layer

102a‧‧‧ first surface

102b‧‧‧second surface

104‧‧‧1/4 wavelength retardation film

106‧‧‧Surface microstructure

108‧‧‧Protective layer

110‧‧‧Light conversion materials

P‧‧‧ bumps

Claims (10)

A high-efficiency brightness enhancement film comprising: a cholesteric liquid crystal layer having a first surface and a second surface; and a 1/4 wavelength retardation film disposed on the first surface of the cholesteric liquid crystal layer and associated with the cholesterol The liquid crystal layer is in direct contact, wherein the 1/4 wavelength retardation film has a surface microstructure, and the surface microstructure is disposed on an upper surface of the 1/4 wavelength retardation film side. The high-efficiency brightness enhancement film according to claim 1, wherein the material of the 1/4 wavelength retardation film comprises a discotic liquid crystal, a rod-like liquid crystal or a rod-shaped liquid crystal doped with a palmitic molecule, wherein the palm-shaped molecule The amount added is 0.01 to 3.0% of the solid content. The high-efficiency brightness enhancement film according to claim 1, further comprising a protective layer disposed on the second surface of the cholesteric liquid crystal layer. The high-efficiency brightness enhancement film according to claim 1, wherein the surface microstructure comprises a columnar structure, a curved columnar structure, a double lens structure, a conical structure, a pyramidal structure, and a lenticular shape. Structure or a combination thereof. The high efficiency brightness enhancing film of claim 1, wherein the 1/4 wavelength retardation film and the surface microstructure comprise at least one of the light conversion materials. A high-efficiency brightness enhancing film comprising: a cholesteric liquid crystal layer having a first surface and a second surface; an interposer disposed on the first surface of the cholesteric liquid crystal layer; and a 1/4 wavelength retardation film And disposed on the interposer, wherein the 1/4 wavelength retardation film has a surface microstructure, and the surface microstructure is disposed on an upper surface of the 1/4 wavelength retardation film side, and wherein the 1/4 wavelength retardation A light converting material is included in at least one of the film, the surface microstructure, and the interposer. The high-efficiency brightness enhancement film according to claim 6, wherein the material of the 1/4 wavelength retardation film comprises a discotic liquid crystal, a rod-like liquid crystal or a rod-shaped liquid crystal doped with a palmitic molecule, wherein the palm-shaped molecule The amount added is 0.01 to 3.0% of the solid content. The high-efficiency brightness enhancement film of claim 6, further comprising a protective layer disposed on the second surface of the cholesteric liquid crystal layer. The high-efficiency brightness enhancement film according to claim 6, wherein the surface microstructure comprises a columnar structure, a curved columnar structure, a double lens structure, a conical structure, a pyramidal structure, and a microlens shape. Structure or a combination thereof. The high efficiency brightness enhancing film of claim 6, wherein the material of the interposer comprises urethane, acrylate, epoxy resin, methacrylate, light converting material or a combination thereof.