CN113253371A - Brightness enhancement film - Google Patents
Brightness enhancement film Download PDFInfo
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- CN113253371A CN113253371A CN202110448202.2A CN202110448202A CN113253371A CN 113253371 A CN113253371 A CN 113253371A CN 202110448202 A CN202110448202 A CN 202110448202A CN 113253371 A CN113253371 A CN 113253371A
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- brightness enhancement
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
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Abstract
The embodiment of the application provides a brightness enhancement film. The brightness enhancement film comprises a back coating layer, a transparent substrate layer and a micro-prism structure layer; the transparent substrate layer is arranged on the back coating; the microprism structure layer is arranged on the transparent substrate layer and comprises a plurality of microprism structures; at least one through hole is arranged between two adjacent micro prism structures and penetrates through the back coating layer and the transparent substrate layer. The embodiment of the application sets up at least one through-hole between two adjacent microprism structures for this brightness enhancement film not only has the effect of spotlight blast, still possesses excellent gas permeability, thereby can realize in being shaded of jumbo size TV between brightness enhancement film and the brightness enhancement film, and the air between brightness enhancement film and diffuser plate or the light guide plate flows, makes humidity reach abundant exchange balance, can effectively solve jumbo size blast diaphragm moisture absorption, the warpage problem that the hydrofuge is inhomogeneous to bring.
Description
Technical Field
The application relates to the field of functional films, in particular to a brightness enhancement film.
Background
LCD (Liquid Crystal Display) is the mainstream TV (television) Display technology at present. However, the LCD is a non-emissive display device, and a BLU (Back Light Unit) is required to provide a high-brightness and uniform Light source to achieve the display effect. The traditional backlight module of the TV is mainly formed by assembling four films, namely a lower diffusion film, a lower brightness enhancement film, an upper brightness enhancement film and an upper diffusion film. The light-emitting surface of the Brightness Enhancement Film (BEF) has a prism layer structure, and can converge incident light to enhance Brightness, thereby improving the front Brightness of the liquid crystal display. Therefore, the brightness enhancement film is an essential part of the liquid crystal display device.
During the transportation and use of the liquid crystal TV, especially in the marine transportation and the seasonal region, the environmental humidity changes dramatically, and the humidity change range can reach 20% RH-95% RH. In the process of high environmental humidity and alternate change, the whole membrane absorbs moisture and discharges moisture unevenly, so that local expansion and contraction are inconsistent, warping is generated, and wave grains are formed. This may cause dark shadows and ripples on the display screen, which may seriously affect the image quality. With the pursuit of large-size, light and thin design of liquid crystal TV by consumers, the size of the film is larger and larger, the gap of the TV cavity is smaller and smaller, the moisture absorption and moisture discharge of the film are more and more uneven, and the warping and water ripple problems caused by the film are more and more obvious. Therefore, it becomes important to solve the problem of moisture absorption and warpage of the film sheet.
In order to improve the warpage resistance of the optical film, a common method in the industry is to add a large amount of low shrinkage additives (such as polyvinyl acetate (PVAc), polymethyl methacrylate (PMMA), and polystyrene (PSt)) to the coating to reduce the shrinkage of the coating or the film to some extent. For example, in chinese patent application publication No. CN106556886A (publication No. 2017, 4/5), entitled "an anti-warp optical diffusion film and a method for making the same", a formulation of a surface coating is designed: the film-forming resin is composed of liquid rubber and optical resin, and the mass ratio of the liquid rubber to the optical resin is controlled to be 1:1 to 1:9 so as to improve the anti-warping performance of the membrane. However, the influence of these foreign additives on the optical properties and physical properties of the optical film is not known. Other patents, for example, chinese patent application publication No. CN102928900B (publication No. 2015, 6/24), entitled "warp-resistant optical film, method of making the same, and display device using the same," mention that the same coating can be applied to both sides of an optical substrate to reduce the warp. However, although these solutions can technically reduce warpage, optical brightness enhancement films inherently have problems with different top and bottom surface coatings (the top surface is a prismatic structure and the bottom surface is a protective coating) and are not suitable for use. The above two patents improve only the high temperature warpage, but do not improve the warpage caused by humidity unevenness. PCT international patent application publication No. CN102596571B (published 2015, 1-14) entitled "optical film with warp-resistant surface" mentions that a matte surface of a plurality of microstructures can be fabricated on the back side of a first optical film to maintain a coefficient of friction of less than 1 with the upper surface (typically linear prisms) of a second optical film, such that the matte surface on the back side of the first optical film provides a coefficient of friction of less than 1 that improves the warp performance of the entire optical film stack (first and second optical films). However, the scheme has strict requirements on the appearance and the friction coefficient of the contact surfaces of the upper membrane and the lower membrane, and has limitation in application. Therefore, it is urgent to develop an optical film that is resistant to uneven warping by humidity. Therefore, the prior art has defects and needs to be improved and developed.
Disclosure of Invention
The embodiment of the application provides a brightness enhancement film can realize between brightness enhancement film and the brightness enhancement film to and the air between brightness enhancement film and diffuser plate or the light guide plate flows, makes humidity reach abundant exchange balance, and then can effectively solve the warpage problem that jumbo size brightness enhancement diaphragm moisture absorption, hydrofuge inhomogeneous brought.
The embodiment of the application provides a brightness enhancement film, which comprises a back coating layer, a transparent substrate layer and a micro-prism structure layer;
the transparent substrate layer is arranged on the back coating;
the micro-prism structure layer is arranged on the transparent substrate layer and comprises a plurality of micro-prism structures;
at least one through hole is formed between every two adjacent micro prism structures and penetrates through the back coating layer and the transparent base material layer.
In the brightness enhancement film of the embodiment of the present application, the height of the microprism structure layer ranges from 5 μm to 100 μm.
In the brightness enhancement film according to the embodiment of the present application, the through hole has a cylindrical or conical shape.
In the brightness enhancement film of the embodiment of the application, the diameter of the cylindrical through hole is less than 10 μm.
In the brightness enhancement film of the embodiment of the application, the conical aperture of the through hole close to the microprism structure layer is a first aperture, the aperture close to the back coating layer is a second aperture, and the area of the first aperture is larger than that of the second aperture of the through hole.
In the brightness enhancement film of the embodiments of the present application, the diameter of the first aperture is less than or equal to 10 μm.
In the brightness enhancement film according to the embodiment of the present application, the cross-sectional shape of the microprism structure is triangular or circular arc.
In the brightness enhancement film of the embodiment of the present application, the microprism structure having a triangular cross-section comprises a vertex angle far away from the transparent substrate layer, and the vertex angle is in an angle range of 60 ° to 120 °.
In the brightness enhancement film of the embodiment of the present application, the microprism structure having a circular arc cross-section has a circular arc radius ranging from 1 μm to 100 μm.
In the brightness enhancement film of the embodiment of the present application, the microprism structure having a circular arc cross-section has a circular arc angle in a range of 1 ° to 180 °.
The brightness enhancement film provided by the embodiment of the application comprises a back coating layer, a transparent substrate layer and a micro-prism structure layer; the transparent substrate layer is arranged on the back coating; the micro-prism structure layer is arranged on the transparent substrate layer and comprises a plurality of micro-prism structures; at least one through hole is formed between every two adjacent micro prism structures and penetrates through the back coating layer and the transparent base material layer. This application embodiment is through setting up at least one through-hole between two adjacent microprism structures, this through-hole runs through back coating and transparent substrate layer, make this brightness enhancement film not only have spotlight blast's effect, still possess excellent gas permeability, thereby can be in being shaded of jumbo size TV, realize between brightness enhancement film and the brightness enhancement film, and the air flow between brightness enhancement film and diffuser plate or the light guide plate, make humidity reach abundant exchange balance, can effectively solve jumbo size blast diaphragm moisture absorption, the warpage problem that the hydrofuge is inhomogeneous to bring.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural view of a brightness enhancement film according to an embodiment of the present disclosure.
Fig. 2 is a schematic view of another structure of a brightness enhancement film according to an embodiment of the present disclosure.
Fig. 3 is a schematic view of another structure of a brightness enhancement film according to an embodiment of the present disclosure.
Fig. 4 is a schematic view of another structure of a brightness enhancement film according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of 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 application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the application. 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. 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 under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the present application provides a brightness enhancement film 100, and referring to fig. 1 to 4, the brightness enhancement film 100 includes a back coating layer 10, a transparent substrate layer 20, and a micro-prism structure layer 30; the transparent substrate layer 20 is disposed on the back coating 10; the microprism structure layer 30 is disposed on the transparent substrate layer 20, and the microprism structure layer 30 includes a plurality of microprism structures 301; at least one through hole 40 is disposed between two adjacent micro-prism structures 301, and the through hole 40 penetrates through the back coating layer 10 and the transparent substrate layer 20. Through setting up at least one through-hole 40 between two adjacent microprism structures 301, this through-hole 40 runs through back coating 10 and transparent substrate layer 20 for this brightness enhancement film 100 not only has spotlight brightening's effect, still possesses excellent gas permeability, thereby can be in being shaded of jumbo size TV, realize between brightness enhancement film 100 and brightness enhancement film 100, and the air flow between brightness enhancement film 100 and diffuser plate or the light guide plate, make humidity reach abundant exchange balance, can effectively solve the warpage problem that jumbo size brightening diaphragm moisture absorption, the hydrofuge is inhomogeneous and brings.
In some embodiments, the height of the microprism structure layer 30 ranges from 5 μm to 100 μm.
The height of the microprism structure layer 30 is set to be in the range of 5 μm to 100 μm because the height is set according to the current industry. In the range of 5 μm to 100 μm, the higher the height, the better the light gathering effect of the brightness enhancing film, but the more difficult the manufacture and the higher the price, so the height range is preferably 10 μm to 30 μm.
In some embodiments, the through-hole 40 is cylindrical or conical in shape.
The reason why the through hole 40 is formed in a cylindrical shape or a conical shape is that the cylindrical through hole 40 and the conical through hole 40 are simple and easy to implement, and can be drilled by laser or mechanically. It should be noted that the shape of the through hole 40 is not limited to a cylindrical shape or a conical shape, and since the through hole 40 is used for increasing the air flow and accelerating the humidity balance, the through hole 40 is not limited in detail as long as it can increase the air flow and accelerate the humidity balance.
In some embodiments, the diameter of the cylindrical through hole 40 is less than 10 μm.
Among them, in the diameter range (0 μm to 10 μm) of the through-hole 40, the larger the diameter, the better the air fluidity at both sides of the brightness enhancement film, the faster the humidity balance, the smaller the buckling wrinkle, but at the same time, the poorer the visual effect, the less fine the appearance, and therefore, the diameter range of the through-hole 40 is preferably 1 μm to 5 μm.
In some embodiments, the aperture of the conical through-hole 40 near the microprism structure layer 30 is a first aperture 401, the aperture near the backcoat layer 10 is a second aperture 402, and the area of the first aperture 401 is larger than the area of the second aperture 402 of the through-hole 40.
The area of the first aperture 401 is set to be larger than that of the second aperture 402, so that air fluidity and light condensation effect can be considered, namely, the air fluidity and the light condensation effect are good. It should be noted that, in the case that the area of the first aperture 401 is constant, the smaller the area of the second aperture 402 is, the better the light condensing effect of the brightness enhancement film is, the finer the appearance is, and the light is uniform after penetrating through the brightness enhancement film. For example, if the area of the first aperture 401 is set to 10 μm and then the area of the second aperture 402 is set to be approximately 0 μm, and the through hole 40 still belongs to a via hole rather than a closed hole, the brightness enhancement film will have a good light-gathering effect, a fine appearance, and a uniform light after penetrating through the brightness enhancement film. Of course, the area of the second aperture 402 can be specifically set by those skilled in the art according to practical situations, and is not particularly limited herein.
In some embodiments, the diameter of the first orifice 401 is less than or equal to 10 μm.
In the size range of 0 μm to 10 μm, the larger the diameters of the first aperture 401 and the second aperture 402 are, the better the air flowability is on both sides of the brightness enhancement film, the faster the humidity balance is, and the smaller the buckling wrinkles are, but at the same time, the visual effect is worse, and the appearance is not fine enough.
In some embodiments, the cross-sectional shape of the microprism structure 301 is triangular or circular.
Among them, the cross-sectional shape of the microprism structure 301 is set to be triangular or circular arc for two reasons: the triangle and the circular arc have certain convergence effect on the transmitted light (the light is refracted in media with different refractive indexes); and the triangle and the arc are easy to carve by a die and convenient to produce. In addition, the triangular micro-prism structure 301 has a better light condensing effect than the circular arc micro-prism structure 301, but its light uniformizing effect is not as good as the circular arc micro-prism structure 301.
In some embodiments, the microprismatic structure 301 having a triangular cross-sectional shape comprises a vertex angle 3011 away from the transparent substrate layer 20, the vertex angle 3011 being in the range of 60 ° to 120 °.
The angle range of the apex angle 3011 is set according to practical application in the industry, and in the range of 60 ° to 120 °, the smaller the angle, the better the light condensing effect, but the worse the viewing angle (the worse the light uniformizing effect). Therefore, the angle of the apex angle 3011 is preferably 90 °.
In some embodiments, the cross-sectional shape of the microprism structure 301 is a circular arc having a radius ranging from about 1 μm to about 100 μm.
The size range of the arc radius is set according to practical application in the current industry, and in the range of 1-100 microns, the larger the arc radius is, the better the light gathering effect is, but the thicker the structure is, the less fine the appearance is. Therefore, the size range of the arc radius is preferably 20 μm to 50 μm.
In some embodiments, the cross-sectional shape of the microprism structure 301 is a circular arc having an arc angle ranging from 1 ° to 180 °.
The size range of the arc angle is set according to the practical application in the current industry, and in the range of 1-180 degrees, the smaller the angle is, the better the light condensation effect is, and the smaller the visual angle is. Therefore, the size range of the arc angle is preferably 80 ° to 100 °.
In some embodiments, the pitch of adjacent microprism structures 301 ranges from 0 μm to 50 μm.
In some embodiments, the back coating 10 includes particles made of one of PMMA, PBMA and nylon and acrylic resin.
In some embodiments, the material of the transparent substrate layer 20 is one of PET, PC, PS and PMMA.
In some embodiments, the material of the microprism structure layer 30 is acrylic resin.
In summary, the brightness enhancement film 100 provided in the embodiment of the present application includes a back coating layer 10, a transparent substrate layer 20, and a micro-prism structure layer 30; the transparent substrate layer 20 is disposed on the back coating 10; the microprism structure layer 30 is disposed on the transparent substrate layer 20, and the microprism structure layer 30 includes a plurality of microprism structures 301; at least one through hole 40 is disposed between two adjacent micro-prism structures 301, and the through hole 40 penetrates through the back coating layer 10 and the transparent substrate layer 20. This application embodiment is through setting up at least one through-hole 40 between two adjacent microprism structures 301, this through-hole 40 runs through back coating 10 and transparent substrate layer 20, make this brightness enhancement film 100 not only have spotlight blast effect, still possess excellent gas permeability, thereby can be in being shaded of jumbo size TV, realize between brightness enhancement film 100 and the brightness enhancement film 100, and the air flow between brightness enhancement film 100 and diffuser plate or the light guide plate, make humidity reach sufficient exchange balance, can effectively solve jumbo size blast diaphragm moisture absorption, the warpage problem that the hydrofuge is inhomogeneous and brings.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing detailed description is directed to a brightness enhancement film provided in an embodiment of the present application, and the principles and embodiments of the present application are described herein using specific examples, which are merely used to help understand the technical solutions and their core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A brightness enhancement film is characterized by comprising a back coating layer, a transparent substrate layer and a micro-prism structure layer;
the transparent substrate layer is arranged on the back coating;
the micro-prism structure layer is arranged on the transparent substrate layer and comprises a plurality of micro-prism structures;
at least one through hole is formed between every two adjacent micro prism structures and penetrates through the back coating layer and the transparent base material layer.
2. The brightness enhancing film according to claim 1, wherein the height of the microprism structure layer ranges from 5 μ ι η to 100 μ ι η.
3. The brightness enhancing film according to claim 1, wherein the through-hole is cylindrical or conical in shape.
4. The brightness enhancing film according to claim 3, wherein the diameter of the cylindrical through hole is less than 10 μm.
5. The brightness enhancing film according to claim 3, wherein the aperture of the conical through hole near the microprism structure layer is a first aperture and the aperture near the back coating is a second aperture, the first aperture having an area greater than the area of the second aperture.
6. The brightness enhancing film according to claim 5, wherein the first aperture has a diameter less than or equal to 10 μ ι η.
7. The brightness enhancing film according to claim 1, wherein the microprism structure has a triangular or circular arc cross-sectional shape.
8. The brightness enhancing film according to claim 7, wherein the microprismatic structure having a cross-sectional shape of a triangle comprises a vertex angle away from the transparent substrate layer, the vertex angle ranging from 60 ° to 120 °.
9. The brightness enhancing film according to claim 7, wherein the microprism structure has a cross-sectional shape of a circular arc with a radius in the range of 1 μ ι η to 100 μ ι η.
10. The brightness enhancing film according to claim 7, wherein the microprism structure has a cross-sectional shape of a circular arc having an arc angle in the range of 1 ° to 180 °.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110448202.2A CN113253371A (en) | 2021-04-25 | 2021-04-25 | Brightness enhancement film |
| PCT/CN2022/071506 WO2022227706A1 (en) | 2021-04-25 | 2022-01-12 | Brightness enhancement film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110448202.2A CN113253371A (en) | 2021-04-25 | 2021-04-25 | Brightness enhancement film |
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| CN113253371A true CN113253371A (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110448202.2A Pending CN113253371A (en) | 2021-04-25 | 2021-04-25 | Brightness enhancement film |
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| CN (1) | CN113253371A (en) |
| WO (1) | WO2022227706A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114539936A (en) * | 2022-03-24 | 2022-05-27 | 东莞市钜欣电子有限公司 | Light guide plate back glue assembly capable of avoiding bubbles and production method thereof |
| WO2022227706A1 (en) * | 2021-04-25 | 2022-11-03 | 惠州视维新技术有限公司 | Brightness enhancement film |
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| JP2001345526A (en) * | 2000-06-01 | 2001-12-14 | Nitto Denko Corp | Double-sided wiring board and multilayered wiring board using the same |
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| CN205450320U (en) * | 2016-02-25 | 2016-08-10 | 东莞市纳利光学材料有限公司 | High printing opacity brightness enhancement film |
| CN111738192B (en) * | 2020-06-29 | 2022-07-12 | 厦门天马微电子有限公司 | Display module and display device |
| CN113253371A (en) * | 2021-04-25 | 2021-08-13 | 惠州视维新技术有限公司 | Brightness enhancement film |
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- 2021-04-25 CN CN202110448202.2A patent/CN113253371A/en active Pending
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2022
- 2022-01-12 WO PCT/CN2022/071506 patent/WO2022227706A1/en active Application Filing
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| WO2007034595A1 (en) * | 2005-09-26 | 2007-03-29 | Sharp Kabushiki Kaisha | Optical part, lighting apparatus for display device, and display device |
| CN101473249A (en) * | 2006-07-12 | 2009-07-01 | 夏普株式会社 | Optical part, illumination device for display device, and display device |
| CN203298076U (en) * | 2013-05-15 | 2013-11-20 | 上海冠旗电子新材料股份有限公司 | Ultra-thin-type backlight module |
| CN106680915A (en) * | 2015-11-09 | 2017-05-17 | 宁波长阳科技股份有限公司 | Composite brightening film applied to backlight module and backlight module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022227706A1 (en) * | 2021-04-25 | 2022-11-03 | 惠州视维新技术有限公司 | Brightness enhancement film |
| CN114539936A (en) * | 2022-03-24 | 2022-05-27 | 东莞市钜欣电子有限公司 | Light guide plate back glue assembly capable of avoiding bubbles and production method thereof |
| CN114539936B (en) * | 2022-03-24 | 2023-12-01 | 东莞市钜欣电子有限公司 | Light guide plate back adhesive assembly capable of avoiding bubbles and production method thereof |
Also Published As
| Publication number | Publication date |
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| WO2022227706A1 (en) | 2022-11-03 |
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Application publication date: 20210813 |
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