CN105511000B - Light extraction film and preparation method thereof - Google Patents

Light extraction film and preparation method thereof Download PDF

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Publication number
CN105511000B
CN105511000B CN201511002889.8A CN201511002889A CN105511000B CN 105511000 B CN105511000 B CN 105511000B CN 201511002889 A CN201511002889 A CN 201511002889A CN 105511000 B CN105511000 B CN 105511000B
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China
Prior art keywords
microlens structure
light extraction
extraction film
ellipse
straight line
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CN201511002889.8A
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Chinese (zh)
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CN105511000A (en
Inventor
许立雄
魏朝刚
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昆山国显光电有限公司
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made
    • G02B1/10Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11Anti-reflection coatings
    • G02B1/118Anti-reflection coatings having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B3/00Simple or compound lenses
    • G02B3/0006Arrays

Abstract

The present invention relates to a kind of light extraction films and preparation method thereof.Above-mentioned light extraction film includes matrix, and matrix has opposite phototropic face and shady face, and nano projection is provided on phototropic face, and nano projection is in random arrangement;Microlens structure is provided on shady face, microlens structure is in regular array, and the curvature on microlens structure surface is non-constant.Compared with traditional light extraction film, it is provided with nano projection on the phototropic face of light extraction film matrix of the invention, and nano projection is in random arrangement, by the setting of this random nano projection, light reflection can be reduced.Especially in curling, nano projection is still able to maintain stochastic regime, and the characteristic of equivalent refractive index will not be destroyed.Meanwhile the microlens structure of regular array is provided on the shady face of above-mentioned light extraction film matrix, and the curvature on above-mentioned microlens structure surface is non-constant, then can increase the extraction efficiency of light, improve visual angle, is conducive to apply.In addition, also providing a kind of preparation method of light extraction film.

Description

Light extraction film and preparation method thereof

Technical field

The present invention relates to field of optical films, more particularly to a kind of light extraction film and preparation method thereof.

Background technique

With the development of science and technology, the mankind come into the digital age, various digital products emerge one after another.With people's economy Horizontal raising, higher requirements are also raised for quality of the people to digital product.Display obtains the straight of information as people Connect object, it is desirable that clarity is high, visual angle is wide etc..And some displays lead to have substantial portion of light due to the limitation of itself Son cannot escape into air, and photon utilization rate is extremely low.

For example, Organic Light Emitting Diode (Organic Light Emission Diode, abbreviation OLED) is used as a kind of benefit With the spontaneous emission display for showing image for luminous Organic Light Emitting Diode, have brightness is high, material selection range is wide, The characteristics such as driving voltage is low, all solidstate actively shines, while there are the advantages such as fast response time, meet information age mobile communication The requirement of the development trend and green lighting technique that show with information is the focal point of current lot of domestic and foreign researcher. However, due to by indium tin oxide (ITO) and the factors such as substrate of glass and substrate of glass and the reflection and refraction of air surface layer Influence, about 80% photon cannot escape into air, and photon utilization rate is extremely low.

Therefore, by the light extraction film of the micro-structure with special designing, the displays such as OLED can be effectively improved Light extraction efficiency, and the brightness of the emergent light of the displays such as OLED can be made more uniform.

However, the phototropic face of traditional light extraction film uses the bullet header structure of periodic micro structure, such micro-structure Effect be replace membrane system equivalent refractive index dielectric layer, if therefore light extraction film follow screen body curling, bullet header structure etc. The characteristic of effect refractive index will be destroyed, and the recovery rate of light cannot be effectively increased.

Summary of the invention

Based on this, it is necessary to aiming at the problem that recovery rate of light cannot be effectively increased when traditional light extraction film is in curling, A kind of light extraction film of recovery rate that can effectively increase light is provided.

A kind of light extraction film, the light extraction film include matrix, and described matrix has opposite phototropic face and shady face, institute It states and is provided with nano projection on phototropic face, the nano projection is in random arrangement;It is provided with microlens structure on the shady face, The microlens structure is in regular array, and the curvature on the microlens structure surface is non-constant.

Compared with traditional light extraction film, it is provided with nano projection on the phototropic face of light extraction film matrix of the invention, and Nano projection is in random arrangement, by the setting of this random nano projection, can reduce light reflection.Especially in curling, Nano projection is still able to maintain stochastic regime, and the characteristic of equivalent refractive index will not be destroyed.Meanwhile above-mentioned light extraction film matrix Shady face on be provided with the microlens structure of regular array, and the curvature on above-mentioned microlens structure surface is non-constant, then can The extraction efficiency for increasing light, improves visual angle, to be conducive to apply.

The nano projection is selected from least one of nanocone or nano wire in one of the embodiments,.

The microlens structure presses array arrangement in one of the embodiments,.

The microlens structure is oval microlens structure in one of the embodiments,.

In one of the embodiments, described in the straight line where the long axis of ellipse microlens structure described in every row and adjacent rows Straight line parallel where the short axle of oval microlens structure, and the straight line where the long axis of ellipse microlens structure described in every row with The intersection point of straight line where the long axis of ellipse microlens structure described in each column be located at the two neighboring oval microlens structure it Between.

The long axis of the oval microlens structure and the ratio of short axle are 5:1~1:1 in one of the embodiments, and The ratio does not include 1:1.

The microlens structure is projected as smooth closing on the light extraction film surface in one of the embodiments, Curve, the tangent line and the closed curve at any point have and only one intersection point on the closed curve.

In one of the embodiments, described matrix with a thickness of 80 μm~120 μm, the height of the nano projection is 80nm~500nm, the height of the microlens structure are 10 μm~35 μm.

Described matrix is integrated with the nano projection, the microlens structure in one of the embodiments,.

In addition, also providing a kind of preparation method of light extraction film, include the following steps:

Film matrix is provided;

In the nano projection that the one side preparation of the film matrix is in random arrangement;

The microlens structure non-constant in the curvature of regular array and surface is prepared in the another side of the film matrix, Obtain light extraction film.

Nanometer is provided on the phototropic face for the light extraction film matrix being prepared by the preparation method of above-mentioned light extraction film Protrusion, and nano projection is in random arrangement, by the setting of this random nano projection, can reduce light reflection.Especially exist When curling, nano projection is still able to maintain stochastic regime, and the characteristic of equivalent refractive index will not be destroyed.Meanwhile above-mentioned light mentions Take the microlens structure that regular array is provided on the shady face of film matrix, and the non-perseverance of curvature on above-mentioned microlens structure surface It is fixed, then it can increase the extraction efficiency of light, improve visual angle, to be conducive to apply.

Detailed description of the invention

Fig. 1 is the side sectional view of the light extraction film of an embodiment of the present invention;

Fig. 2 is the floor map of the shady face of the light extraction film of an embodiment of the present invention;

Fig. 3 is the floor map of the shady face of the light extraction film of another embodiment of the present invention;

Fig. 4 is the flow chart of the preparation method of the light extraction film of an embodiment of the present invention.

Specific embodiment

In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.

It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to To another element or it may be simultaneously present centering elements.

Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases Any and all combinations of the listed item of pass.

Referring to Figure 1, the present invention proposes a kind of light extraction film 100.Light extraction film 100 includes matrix 110, and matrix 110 has There are opposite phototropic face 112 and shady face 114.Phototropic face 112 be towards light source and receive light source light one side, light source can Think OLED luminescent layer etc..And shady face 114 is the another side of light extraction film 100, i.e., back to light source.

As shown in Figure 1, several nano projections 120 are provided in the embodiment of the present invention on the phototropic face 112 of matrix 110. And these nano projections 120 are in random arrangement.The nano projection 120 of the embodiment of the present invention is nanocone, i.e. nanoscale taper Structure, multiple sizes of nanocone constitute random nano-array.When the light extraction film 100 of the present embodiment is covered in OLED When the surface of equal displays, the random nano array structure of this nanocone composition is equivalent to traditional variations in refractive index medium Layer can reduce reflection loss when light passes through medium in visible light wave range, increase the transmitance of light.

In addition, the nano projection 120 of random arrangement of the invention is not by light extraction film compared with periodic nano-structure 100 state limit.For example, the nano projection 120 of random arrangement of the invention remains to protect even if light extraction film 100 is bent Stochastic regime is held, the characteristic of equivalent refractive index will not be destroyed.And the nanocone structures of random arrangement compare periodic nanometer Wimble structure has better anti-reflection characteristic, more conducively applies.

It should be noted that the nanocone knot that the nano projection 120 of light extraction film 100 of the present invention is not limited to the present embodiment Structure can also be other nano projection structures.For example, it is also possible to for the mixing knot of nano wire or nanocone and nano wire composition Structure.For convenience of understanding, the shape of nano wire is similar to palpus.Nano wire can preferably couple the light into base in optical transmission process Body 110, to reduce the reflection loss of light.

Referring to Figure 1 and Fig. 2, to be provided with several sizes on the shady face 114 of matrix 110 in the embodiment of the present invention identical Microlens structure 130.The microlens structure 130 of the embodiment of the present invention is oval microlens structure, and multiple lenticule knots Structure 130 is in regular array.

Specifically, as shown, multiple microlens structures 130 press array arrangement.The long axis of every row ellipse microlens structure Straight line parallel where the straight line at place and the short axle of adjacent rows ellipse microlens structure, and the length of every row ellipse microlens structure The intersection point of straight line where axis and the straight line where the long axis of each column ellipse microlens structure is located at two neighboring oval lenticule Between structure, as shown in phantom in Figure 2.Using the method for this major and minor axis cross arrangement, light is increased in all directions Uniformity.

The length of the long axis of oval microlens structure is 30 μm in the present embodiment, and the length of short axle is 7 μm.It is oval micro- The radius of mirror structure is 12 μm.The distance between two neighboring ellipse microlens structure is 2 μm in every row or each column.But it is unlimited In this, the ratio of the long axis of oval microlens structure and short axle can also any number between 5:1~1:1, but above-mentioned ratio Example does not include 1:1.In the radius of oval microlens structure and every row or each column between two neighboring ellipse microlens structure Distance can also be configured according to actual needs.

By this arrangement mode embarked on journey in column, amount of light is not only increased, it can also be by improving oval lenticule The oval length-width ratio of structure or the height of oval microlens structure improve visual angle, reduce brightness in light output and color Angle inhomogeneities.

In addition, referring to Fig. 2, adjacent four microlens structures 130 define one piece of white space.If the embodiment of the present invention Middle light extraction film 100 in use part shady face 114 brightness perhaps color it is uneven then can in brightness or Continue the microlens structure 130 that required size is set in the non-uniform above-mentioned white space of color, convenient for light extraction film 100 into Row amendment.

Certainly, the rule that the microlens structure 130 on the shady face 114 of matrix 110 of the invention is not limited to the present embodiment Oval microlens structure can also be other shapes.But microlens structure 130 is in the projection palpus on 100 surface of light extraction film For smooth closed curve, and the tangent line Yu closed curve at any point have and only one intersection point on the closed curve.In addition, The necessary condition also needed to meet is that the curvature on 130 surface of microlens structure is non-constant.This shows microlens structure of the invention 130 be not ball lenticule.Compared with ball lenticule, due to the microlens structure 130 with non-ball lenticule, not only increase Amount of light is added, visual angle can also have been improved by improving the three-dimensional dimension of microlens structure 130, reduce the brightness in light output With the angle inhomogeneities of color.

Matrix 110 with a thickness of 100 μm in the embodiment of the present invention.Nano projection 112 with a thickness of 80nm.Microlens structure 114 with a thickness of 12 μm.But above-mentioned each size is without being limited thereto, and the thickness of matrix 110 can also be between 80 μm~120 μm Any number.The thickness of nano projection 112 is randomly dispersed between 80nm~500nm.The thickness of microlens structure 114 can be with For any number between 10 μm~35 μm.

In conclusion being provided with and receiving on the phototropic face of light extraction film matrix of the invention compared with traditional light extraction film Rice protrusion, and nano projection is in random arrangement, by the setting of this random nano projection, can reduce light reflection.Especially In curling, nano projection is also to maintain stochastic regime, and the characteristic of equivalent refractive index will not be destroyed.Meanwhile above-mentioned light Extract the microlens structure that regular array is provided on the shady face of film matrix, and the non-perseverance of curvature on above-mentioned microlens structure surface It is fixed, then it can increase the extraction efficiency of light, improve visual angle, to be conducive to apply.

In addition, the arrangement mode that the microlens structure on the shady face of matrix of the invention is not limited to the above embodiments, also It can carry out several deformation.For example, the long axis direction of the oval microlens structure of adjacent rows can be consistent, as shown in Figure 3. Microlens structure 230 on the shady face 214 of 200 matrix of light extraction film of another embodiment is oval microlens structure, phase The oval microlens structure of adjacent two rows or adjacent two column is arranged alternately, and is mutually improved visual angle, can also be reduced in light output The angle inhomogeneities of brightness and color.

Light extraction film of the invention can be applied to the surface of OLED, to increase the recovery rate of light, increase the outer amount of OLED Sub- efficiency is suitable for flexibility OLED and shows and illuminate.Certainly, above-mentioned light extraction film is equally applicable for the surface of other displays.

Fig. 4 is referred to, the preparation method of above-mentioned light extraction film of the invention includes the following steps:

S10, film matrix is provided.

The material of film substrate is that can be used as the material of flexible light extraction film, such as can be PEN (poly- naphthalenedicarboxylic acid second two Alcohol ester) or PET (polyethylene terephthalate), such film has the advantages that light transmission rate is high, flexibility is good, convenient for Its surface makes micro-structure.

S20, above-mentioned film matrix one side preparation be in random arrangement nano projection.

S30, above-mentioned film matrix another side preparation in regular array and lenticule knot that the curvature on surface is non-constant Structure obtains light extraction film.

It is possible, firstly, to prepare the metallic silver layer of about 20nm thickness on the glass substrate using silver mirror reaction.

Secondly, annealing using metallic silver layer of the rta technique to preparation, the surface of metallic silver layer is formed at this time The metallic silver particles of particle diameter random distribution.

Again, using metallic silver layer as mask, the nano projection of random arrangement is prepared on the glass substrate by etching technics.

Next, the nano projection of random arrangement is transferred in R2R (roll to roll) roller by transfer technique It goes.

Then, it can be prepared on the glass substrate by yellow light etching technics in the variable curvature on regular array and surface Microlens structure, then by transfer technique, another rolling which being transferred in R2R (roll to roll) On cylinder.

Finally, prepare two rollers with special mask are attached to corresponding machine up, using R2R technology, Preparation one side has random nano-array on film matrix, and another side has the light extraction film of oval-shaped array lenticule.

The matrix of light extraction film of the invention is integrated with nano projection, microlens structure.Three can be made to be connected firmly, Extend service life.

Nanometer is provided on the phototropic face for the light extraction film matrix being prepared by the preparation method of above-mentioned light extraction film Protrusion, and nano projection is in random arrangement, by the setting of this random nano projection, can reduce light reflection.Especially exist When curling, nano projection is still able to maintain stochastic regime, and the characteristic of equivalent refractive index will not be destroyed.Meanwhile above-mentioned light mentions Take the microlens structure that regular array is provided on the shady face of film matrix, and the non-perseverance of curvature on above-mentioned microlens structure surface It is fixed, then it can increase the extraction efficiency of light, improve visual angle, to be conducive to apply.

Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, all should be considered as described in this specification.

The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims (7)

1. a kind of light extraction film, which is characterized in that the light extraction film includes matrix, described matrix have opposite phototropic face and Shady face is provided with nano projection on the phototropic face, and the nano projection is in random arrangement, so that the light extraction film is curved The characteristic of the equivalent refractive index of the nano projection will not be destroyed when bent;It is provided with microlens structure on the shady face, The microlens structure is in regular array, and the curvature on the microlens structure surface is non-constant;
The microlens structure presses array arrangement;
The microlens structure is oval microlens structure;
The short axle institute of ellipse microlens structure described in straight line and adjacent rows where the long axis of ellipse microlens structure described in every row Straight line parallel, and ellipse microlens structure described in straight line where the long axis of ellipse microlens structure described in every row and each column Long axis where the intersection point of straight line be located between two neighboring oval microlens structure;Or
The long axis direction of the oval microlens structure of adjacent rows is consistent, and the long axis of ellipse microlens structure described in every row It is micro- that the intersection point of straight line where the short axle of ellipse microlens structure described in the straight line and each column at place is located at two neighboring ellipse Between mirror structure.
2. light extraction film according to claim 1, which is characterized in that the nano projection is in nanocone or nano wire At least one.
3. light extraction film according to claim 1, which is characterized in that the long axis and short axle of the ellipse microlens structure Ratio is 5:1~1:1, and the ratio does not include 1:1.
4. light extraction film according to claim 1, which is characterized in that the microlens structure is on the light extraction film surface Be projected as smooth closed curve, on the closed curve tangent line at any point and the closed curve have and only one Intersection point.
5. light extraction film according to claim 1, which is characterized in that described matrix with a thickness of 80 μm~120 μm, it is described The height of nano projection is 80nm~500nm, and the height of the microlens structure is 10 μm~35 μm.
6. light extraction film according to claim 1, which is characterized in that described matrix and the nano projection, described micro- Mirror structure is integrated.
7. a kind of preparation method of light extraction film, which comprises the steps of:
Film matrix is provided;
The film matrix one side preparation in random arrangement, so that by the light extraction film be bent when nano projection it is equivalent The nano projection that the characteristic of refractive index will not be destroyed;
In the another side preparation of the film matrix microlens structure non-constant in the curvature of regular array and surface, obtain Light extraction film;
Wherein, the microlens structure presses array arrangement;
The microlens structure is oval microlens structure;
The short axle institute of ellipse microlens structure described in straight line and adjacent rows where the long axis of ellipse microlens structure described in every row Straight line parallel, and ellipse microlens structure described in straight line where the long axis of ellipse microlens structure described in every row and each column Long axis where the intersection point of straight line be located between two neighboring oval microlens structure;Or
The long axis direction of the oval microlens structure of adjacent rows is consistent, and the long axis of ellipse microlens structure described in every row It is micro- that the intersection point of straight line where the short axle of ellipse microlens structure described in the straight line and each column at place is located at two neighboring ellipse Between mirror structure.
CN201511002889.8A 2015-12-28 2015-12-28 Light extraction film and preparation method thereof CN105511000B (en)

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Publication number Priority date Publication date Assignee Title
CN106094076A (en) * 2016-08-19 2016-11-09 武汉华星光电技术有限公司 Brightness enhancement film and backlight module
CN107976728A (en) * 2017-12-28 2018-05-01 武汉华星光电技术有限公司 Micro-structure, display device and its display panel

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CN104386645A (en) * 2014-10-16 2015-03-04 中国工程物理研究院激光聚变研究中心 Method for preparing random sub-wavelength broadband antireflection microstructure based on mask etching

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CN1881033A (en) * 2005-06-13 2006-12-20 精工爱普生株式会社 Method of manufacturing backlight unit, backlight unit, electrooptical device and electronic equipment
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Application publication date: 20160420

Assignee: Yungu (Gu'an) Technology Co., Ltd.|Bazhou Yungu Electronic Technology Co., Ltd.|Kunshan Institute of technology new flat panel display technology center Co., Ltd

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Denomination of invention: Light extraction film and preparing method thereof

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Address after: No. 2 Xiangshan Avenue, Yongning Street, Zengcheng District, Guangzhou, Guangdong province (the core of Zengcheng economic and Technological Development Zone)

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