CN111708217A - Light guide reflective film, manufacturing method and backlight module - Google Patents

Light guide reflective film, manufacturing method and backlight module Download PDF

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Publication number
CN111708217A
CN111708217A CN202010527885.6A CN202010527885A CN111708217A CN 111708217 A CN111708217 A CN 111708217A CN 202010527885 A CN202010527885 A CN 202010527885A CN 111708217 A CN111708217 A CN 111708217A
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China
Prior art keywords
layer
light
reflecting
structural layer
microstructure
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Pending
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CN202010527885.6A
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Chinese (zh)
Inventor
丁清华
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Nanjing Juqingxin Material Co ltd
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Nanjing Juqingxin Material Co ltd
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Priority to CN202010527885.6A priority Critical patent/CN111708217A/en
Publication of CN111708217A publication Critical patent/CN111708217A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention discloses a light guide reflective film, which comprises: the light-reflecting layer is arranged between the first structural layer and the second structural layer, the first structural layer comprises a substrate and a micro-structural layer, the micro-structural layer is arranged on the substrate, and the light-reflecting layer covers the whole surface of the first structural layer, which faces the second structural layer. The invention also discloses a backlight module using the light guide reflective film. The light guide reflective film of the invention replaces the traditional light guide plate and reflective sheet, so that the manufacturing process is simpler, the functions of part of optical films are integrated, and the overall thickness of the backlight module is reduced.

Description

Light guide reflective film, manufacturing method and backlight module
Technical Field
The invention relates to the field of liquid crystal displays, in particular to a light guide reflective film, a manufacturing method thereof and a backlight module
Background
The liquid crystal display technology has the advantages of high display quality, low power consumption, large visual area, low cost and the like, and is widely applied to the fields of televisions, notebook computers, mobile phones, monitors and the like. The liquid crystal display panel is a non-self-luminous display panel, so a backlight module is required to provide a planar light source. The side-edge light-entering type backlight module adopts a light guide plate to form a plane light source. The light guide plate is used for reflecting a point light source or a linear light source entering from the light incident side of the light guide plate and then emitting the light source or the linear light source from the light emitting surface of the light guide plate to form a plane light source. The light guide plate of the traditional backlight module is produced in an injection molding mode, and a plurality of optical films are needed, so that the whole thickness of the backlight module is no longer advantageous under the current trend of light and thin.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a light guide reflective film, which reduces the thickness of a light guide plate and the number of optical films in a backlight module, thereby reducing the thickness of the whole module.
The light guide reflective film provided by the invention comprises a first structural layer, a second structural layer and a reflective layer, wherein the second structural layer is arranged on the first structural layer in a laminated mode, the reflective layer is arranged between the first structural layer and the second structural layer, the first structural layer comprises a substrate and a micro-structural layer, the micro-structural layer is arranged on the substrate, and the reflective layer covers the whole surface, facing the second structural layer, of the first structural layer.
Preferably, the microstructure layer has a plurality of microstructures, the light reflecting layer covers the surface of the microstructure layer, or the light reflecting layer covers the surfaces of the microstructure layer and the substrate, the thickness of the substrate is greater than 0 and less than or equal to 10 μm, and preferably, the thickness of the substrate is greater than 0 and less than or equal to 3 μm.
Preferably, the microstructure is a triangular prism, and the microstructure layers are triangular prisms arranged in sequence; the height of the triangular prism is gradually increased from one side to the other side, and the height change of the triangular prism conforms to a quadratic curve.
Preferably, the microstructures are short prisms, hemispheres, semi-ellipsoids, short prisms with wave motion, or a combination thereof, and the microstructures are randomly scattered, or arranged in an array, or arranged from one side to the other side in a sparse and dense manner, or arranged from one side to the other side in a small and large manner.
Preferably, the second structural layer is a prism layer.
Preferably, the light reflecting layer is a metal layer or a metal oxide layer, preferably, the light reflecting layer is a silver-plated or aluminum-plated layer, or contains TiO2The white coating of (2).
The backlight module provided by the invention comprises: the light source is arranged adjacent to the light inlet face.
According to the method for manufacturing the light guide reflective film, firstly, a microstructure layer is formed on a substrate; secondly, forming a reflective layer on the surface of the microstructure layer or on the surface of the substrate and the microstructure layer; finally, forming a second structural layer on the surface of the reflecting layer; wherein, a roll-to-roll production process is adopted in the process of forming the first structural layer and the second structural layer.
The light guide reflecting film and the backlight module provided by the invention replace the traditional light guide plate and a reflecting sheet, so that the light guide reflecting film is easier to manufacture, and the light guide reflecting film has a prism structure simultaneously, so that the use of the traditional optical film can be reduced, and the thickness of the whole module is thinner.
Drawings
FIG. 1 is a schematic structural view of a light-guiding reflective film according to the present invention;
FIG. 2 is a schematic view of a first structural layer of the light directing retroreflective sheeting of FIG. 1;
FIG. 3 is a schematic view of a light-guiding reflective film according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first structural layer of a light directing retroreflective sheeting in accordance with another embodiment of the present invention;
FIG. 5 is a schematic view of a first structural layer of a light directing retroreflective sheeting in accordance with another embodiment of the present invention;
FIG. 6 is a schematic view of a backlight module according to the present invention;
wherein:
10 a backlight module; 11 a light source; 13 light guiding and reflecting film; 131 a first structural layer; 132 a light-reflecting layer; 133 a second structural layer; 1311 a substrate; 1312 a microstructure layer; l curve
Detailed Description
The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting. The invention is described in further detail below with reference to the accompanying drawings:
fig. 1-2 are schematic structural views of the light-guiding reflective film of the present invention. As shown in fig. 1-2, the light guiding and reflecting film 13 includes a first structural layer 131, a reflecting layer 132 and a second structural layer 133, which are sequentially disposed, in this embodiment, the first structural layer 131 includes a substrate 1311 and a micro-structural layer 1312, and the micro-structural layer 1312 includes a plurality of strip-shaped triangular prisms, and the strip-shaped triangular prisms are sequentially arranged along a direction perpendicular to an extending direction of the triangular prisms. The light reflecting layer 132 covers the triangular prism of the microstructure layer 1312, and covers both side surfaces of the triangular prism. For better reflection, the light reflecting layer 132 may be a metal plating layer or a white coating layer containing TiO 2. The second structure layer 133 is directly formed on the reflective layer 132, and a prism structure is disposed on the surface of the second structure layer, which is away from the first structure layer 131, and the prism structure has a light-gathering effect, and can replace a brightness enhancement film, thereby reducing the usage amount of an optical film in the backlight module, and reducing the thickness. The vertex angle of the prism structure is set to be 90 degrees, the height of the prism is 10-25 mu m, and the thickness of the second structure layer excluding the prism structure part is 10-50 mu m. The microstructure portion of the first structural layer 131 and the second structural layer 133 are both made of light-cured resin, and may be acrylic resin.
As shown in fig. 3, a light guiding and reflecting film structure according to another embodiment of the present invention is similar to that shown in fig. 1, where the same reference numerals denote the same structural modules, and a difference from the light guiding and reflecting film 13 shown in fig. 1 lies in the design on the microstructure layer of the first structural layer 131, the microstructure of the microstructure layer in this embodiment is still a strip-shaped triangular prism, and the difference is that the heights of the triangular prism in this embodiment are sequentially increased from one side of the triangular prism to the other side of the triangular prism, and the height values of the triangular prism are distributed on a quadratic curve L, specifically, a quadratic parabolic curve.
As shown in fig. 4-5, a design of the first structural layer of the light guiding reflective film according to another embodiment of the present invention is different from the design of the first structural layer of the light guiding reflective film shown in fig. 2 in the design of the microstructure in the microstructure layer 1312, and in the embodiment shown in fig. 4-5, the microstructure is substantially a partial ellipsoid structure; unlike the previous embodiment, the light reflecting layer 132 is disposed not only on the surfaces of the microstructures, but also on the exposed substrate between the microstructures, such that the light reflecting layer 132 covers all the upper surfaces of the first structural layer. While the microstructures in fig. 4 are arranged in an array of the same partial ellipsoidal structures, the partial ellipsoidal structures as the microstructures in fig. 5 have a gradual change in size, specifically, gradually increase from one side to the opposite side. In other embodiments, the microstructures can also be designed as short prism structures, or hemispherical structures, or undulating short prisms, or a combination of different structures; in addition, the arrangement of the microstructures may also be designed as random distribution, or array arrangement, which is arranged from one side to the other side in a sparse and dense manner, or from one side to the other side in a small and large manner, or a combination arrangement with self-consistent logic (e.g., random distribution and array arrangement are not self-consistent logic).
The light guide reflective film in the embodiment is different from the traditional light guide plate in the manufacturing process; coating a substrate with light-cured resin, impressing a microstructure layer on the light-cured resin of the substrate by using a forming machine, and then curing to form a first structural layer; then coating the first structure layer with a metal layer (such as silver or aluminum) or TiO2To form a light reflecting layer; and coating the light-cured resin on the first structural layer with the reflective layer as a substrate, stamping a microstructure on the light-cured resin of the substrate by a forming machine, and curing to form a second structural layer, so that the light-guiding reflective film is manufactured. Wherein the light-curable resin may be an acrylic resin; in addition, the forming processes of the first structure layer 131 and the second structure layer 133 can be realized by Roll-to-Roll, which replaces the traditional light guide plate injection forming process, and the efficiency, yield and cost are optimized.
Fig. 6 is a schematic structural diagram of a backlight module according to the present invention, and as shown in fig. 6, the backlight module 10 includes a light source 11 and a light guiding reflective film 13, a side of the second structural layer 133 of the light guiding reflective film 13 away from the first structural layer 131 is a light emitting surface, a side of the first structural layer 131 away from the light emitting surface is a bottom surface, a side connecting the light emitting surface and the bottom surface and facing the reflective layer 132 is a light incident surface, and the light source 11 is disposed adjacent to the light incident surface. The light-guiding reflective film shown in the figure is the same as the light-guiding reflective film shown in fig. 1, and in other embodiments, the light-guiding reflective film may be the light-guiding reflective film described in any of the foregoing embodiments, and is not described in detail herein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the invention, which is defined by the appended claims and all simple equivalent changes and modifications within the scope of the invention. Moreover, it is not necessary for any embodiment or claim of the invention to address all of the objects, advantages, or features disclosed herein. In addition, the abstract and the title of the invention are provided for assisting the retrieval of patent documents and are not intended to limit the scope of the invention. Furthermore, the terms "first", "second", and the like in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Claims (11)

1. A light directing retroreflective sheeting comprising: the light-reflecting structure comprises a first structural layer, a second structural layer and a light-reflecting layer, wherein the second structure is arranged on the first structural layer in a stacking mode, and the light-reflecting layer is arranged between the first structural layer and the second structural layer.
2. A light directing and reflecting film according to claim 1, wherein the microstructure layer has a plurality of microstructures, the light reflecting layer covers the surface of the microstructure layer, or the light reflecting layer covers the surfaces of the microstructure layer and the substrate, the thickness of the substrate is greater than 0 and less than or equal to 10 μm, preferably, the thickness of the substrate is greater than 0 and less than or equal to 3 μm.
3. A light directing and reflecting film as recited in claim 2, wherein: the microstructure is a triangular prism, and the microstructure layer is a triangular prism which is arranged in sequence.
4. A light directing and reflecting film according to claim 3, wherein: the height of the triangular prism is gradually increased from one side to the other side.
5. A light directing and reflecting film according to claim 4, wherein: the height change of the triangular prism of the microstructure layer conforms to a quadratic curve.
6. A light directing and reflecting film as recited in claim 2, wherein: the microstructures are short prisms, hemispheres, semi-ellipsoids, undulating short prisms, or combinations thereof.
7. A light directing and reflecting film according to claim 6, wherein: the microstructures are randomly scattered or arranged in an array, or arranged from one side to the other side in a sparse and dense mode, or arranged from one side to the other side in a small and large size mode.
8. A light directing and reflecting film as recited in claim 1, wherein: the second structural layer is a prism layer.
9. A light directing and reflecting film as recited in claim 1, wherein: the reflecting layer is a metal layer or a metal oxide layer, preferably, the reflecting layer is a silver-plated or aluminum-plated layer or contains TiO2The white coating of (2).
10. A backlight module includes: a light source and the light directing film of any of claims 1-10, wherein the first structural layer is on the bottom surface of the light directing film, the second structural layer is on the light exit surface of the light directing film, the light entry surface connects the bottom surface and the light exit surface, and the light source is disposed adjacent to the light entry surface.
11. A method of making a light directing retroreflective sheeting as claimed in any of claims 1-9, comprising the steps of:
forming a microstructure layer on a substrate;
forming a reflecting layer on the surface of the microstructure layer or on the surface of the substrate and the microstructure layer;
forming a second structural layer on the surface of the reflecting layer; the method is characterized in that the first step and the third step adopt a roll-to-roll production process.
CN202010527885.6A 2020-06-11 2020-06-11 Light guide reflective film, manufacturing method and backlight module Pending CN111708217A (en)

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CN202010527885.6A CN111708217A (en) 2020-06-11 2020-06-11 Light guide reflective film, manufacturing method and backlight module

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Application Number Priority Date Filing Date Title
CN202010527885.6A CN111708217A (en) 2020-06-11 2020-06-11 Light guide reflective film, manufacturing method and backlight module

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CN111708217A true CN111708217A (en) 2020-09-25

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101440935A (en) * 2007-11-20 2009-05-27 财团法人工业技术研究院 Light guide board and illuminating device thereof
TW201024866A (en) * 2008-12-31 2010-07-01 Eternal Chemical Co Ltd Backlight module
CN102411165A (en) * 2010-07-23 2012-04-11 颖台科技股份有限公司 Light-guide Apparatus With Micro-structure, Back Light Unit Comprising The Same And Liquid Crystal Display Comprising The Same
CN203433139U (en) * 2013-07-29 2014-02-12 信利半导体有限公司 Backlight module group and light-guide plate thereof
CN108010981A (en) * 2017-12-28 2018-05-08 常州华威新材料有限公司 Improve reflective membrane of photovoltaic conversion efficiency and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101440935A (en) * 2007-11-20 2009-05-27 财团法人工业技术研究院 Light guide board and illuminating device thereof
TW201024866A (en) * 2008-12-31 2010-07-01 Eternal Chemical Co Ltd Backlight module
CN102411165A (en) * 2010-07-23 2012-04-11 颖台科技股份有限公司 Light-guide Apparatus With Micro-structure, Back Light Unit Comprising The Same And Liquid Crystal Display Comprising The Same
CN203433139U (en) * 2013-07-29 2014-02-12 信利半导体有限公司 Backlight module group and light-guide plate thereof
CN108010981A (en) * 2017-12-28 2018-05-08 常州华威新材料有限公司 Improve reflective membrane of photovoltaic conversion efficiency and preparation method thereof

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