WO2016138736A1 - 复合导光板及其制备方法、背光模组、显示装置 - Google Patents

复合导光板及其制备方法、背光模组、显示装置 Download PDF

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Publication number
WO2016138736A1
WO2016138736A1 PCT/CN2015/085953 CN2015085953W WO2016138736A1 WO 2016138736 A1 WO2016138736 A1 WO 2016138736A1 CN 2015085953 W CN2015085953 W CN 2015085953W WO 2016138736 A1 WO2016138736 A1 WO 2016138736A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
reflective film
main body
composite light
Prior art date
Application number
PCT/CN2015/085953
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English (en)
French (fr)
Inventor
石海军
刁凯
朴仁镐
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/912,812 priority Critical patent/US20170003437A1/en
Publication of WO2016138736A1 publication Critical patent/WO2016138736A1/zh

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00663—Production of light guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00865—Applying coatings; tinting; colouring
    • B29D11/00875—Applying coatings; tinting; colouring on light guides
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • 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
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present disclosure belongs to the field of liquid crystal display technologies, and in particular, to a composite light guide plate, a preparation method thereof, a backlight module, and a display device.
  • the light guide plate is a main component of the backlight module for converting a point light source and a line light source into a surface light source, and can be applied to a flat display device such as a liquid crystal display, a notebook computer, a digital camera, a monitor, and a projector, and is used for providing uniform brightness.
  • the surface light source output enables the flat display device to display images properly.
  • a light emitting diode (LED) is more and more used as a light source of a light guide plate in a backlight.
  • a reflective sheet is assembled on a lower surface of the light guide plate, and the reflective sheet is used to reflect light reaching the lower surface of the light guide plate toward the surface of the light guide plate to prevent light from being irradiated from the lower surface of the light guide plate. Loss, which can improve the utilization of light.
  • the present disclosure aims to at least solve one of the technical problems existing in the prior art, and proposes a composite light guide plate and a preparation method thereof, a backlight module and a display device, and the composite light guide plate is an integrated composite light guide plate having a reflective function.
  • the invention can not only improve the light reflection effect, but also facilitate the thin design of the backlight module and simplify the assembly process and structure of the backlight module, thereby improving the light utilization efficiency of the display device, and being easy to realize thinning and simplifying the structure and assembly process; Further, it is possible to prevent the light guide plate main body from being scratched and the reflection sheet from wrinkling, thereby improving the quality of the display screen of the display device.
  • the present disclosure provides a composite light guide plate comprising a light guide plate main body and a reflective film, one side surface of the light guide plate main body is provided with a mesh point, and the reflective film is disposed on the light guide plate main body. On the surface having dots, the reflective film is set to reach it The light is reflected toward the light exit surface of the light guide body.
  • the reflective film is formed of a polyterephthalic acid material.
  • the reflective film is formed by a coating process.
  • a light guide plate having a dot on one side surface is formed by hot rolling or injection.
  • the halftone dot is a concave portion or a convex portion formed on a surface of the light guide plate main body.
  • the reflective film completely covers the surface of the light guide body and the outer surface of the concave portion or the convex portion where the reflective film is located.
  • the outer surface of the reflective film is a flat surface.
  • the present disclosure further provides a backlight module, which includes a composite light guide plate, and the composite light guide plate adopts a composite light guide plate provided by another technical solution of the present disclosure.
  • the present disclosure further provides a display device, which includes a backlight module and a display panel, and the backlight module adopts a backlight module provided by another technical solution of the present disclosure.
  • the present disclosure further provides a method for preparing a composite light guide plate, comprising the following steps: Step S1: preparing a light guide plate body having a dot formed on one side surface; Step S2: having a mesh point on the main body of the light guide plate A reflective film is formed on the surface.
  • step S2 the reflective film is formed by a coating process.
  • the reflective film is formed of a polyterephthalic acid material.
  • step S3 is further included: curing the reflective film.
  • step S3 the reflective film is cured by ultraviolet lamp irradiation curing.
  • step S1 the light guide plate body having the mesh dots on the surface is prepared by hot rolling or injection.
  • the dot is a concave portion or a convex portion formed on a surface of the light guide plate body.
  • the outer surface of the reflective film is a flat surface.
  • the composite light guide plate provided by the present disclosure has a reflective film formed on a surface of the light guide plate main body having a halftone dot, and the reflective film is disposed to reflect the light reaching the light toward the light exit surface of the light guide plate main body. It can be seen that the composite light guide plate provided by the present disclosure is an integrated composite light guide plate having a reflective function, which is compared with the prior art in which a reflective sheet is required to be assembled on the lower surface of the light guide plate body to realize a reflection function.
  • the light guide plate can realize the thinning of the backlight module while realizing the function of the light guide plate main body and the reflection sheet in the prior art; and thirdly, since there is adhesion between the reflective film and the surface of the light guide plate main body thereof, The reflective film does not move relative to the main body of the light guide plate, so that there is no risk of the surface contacting the two being scratched, and the quality of the display screen of the display panel can be improved.
  • the composite light guide plate has an integrated structure, and the existing light guide plate body and the reflection sheet Compared with the assembly, it not only simplifies the assembly process of the backlight module, but also simplifies the structure of the backlight module.
  • the backlight module provided by the present disclosure can improve the light utilization efficiency of the backlight module by using the composite light guide plate provided by another technical solution of the present disclosure, and is easy to realize thinning and simplify the structure and assembly process.
  • the display device provided by the present disclosure can improve the light utilization efficiency of the display device by using the backlight module provided by another technical solution of the present disclosure, and is easy to realize thinning, improve the quality of the display screen, and simplify the structure and assembly process.
  • the method for preparing a composite light guide plate first prepares a light guide plate main body having a dot formed on one surface thereof by means of step S1, and then forms a reflective film on the surface of the light guide plate main body having a dot by means of step S2, and the reflective film is It is arranged to reflect the light reaching the light toward the light-emitting surface of the light guide body, and the composite light guide plate having the reflective film formed on the surface of the mesh point can be prepared by using the preparation method, and the composite light guide plate is an integrated composite guide with reflective function.
  • the light panel is required to be assembled on the lower surface of the main body of the light guide plate to realize the reflection function.
  • the first advantage is that the gap between the reflective sheet and the main body of the light guide plate can be avoided, so that part of the light can be avoided. The gap is lost, so that the reflection effect can be enhanced and the light utilization efficiency can be improved.
  • the thickness of the reflective film is generally thin, which is smaller than the thickness of the reflective sheet in the prior art, the thin composite light guide plate can be used to realize the prior art.
  • the function of the main body of the light guide plate and the reflection sheet can also reduce the thickness of the backlight module
  • the composite light guide plate body has an integrated structure. Compared with the existing light guide plate main body and the reflection sheet assembly, the assembly process of the backlight module is simplified, and the structure of the backlight module can be simplified.
  • FIG. 1 is a cross-sectional view of a first composite light guide plate according to an embodiment of the present disclosure
  • FIG. 2 is a cross-sectional view of a second composite light guide plate according to an embodiment of the present disclosure
  • FIG. 3 is a partial cross-sectional view of a backlight module according to an embodiment of the present disclosure
  • FIG. 4 is a flow chart of a method for fabricating a composite light guide plate according to an embodiment of the present disclosure
  • Fig. 5 is a structural schematic view showing a process of forming a reflective film by a coating process.
  • the reference numerals are: 10, a composite light guide plate; 101, a light guide plate body; 1011, a dot; 102, a reflective film; 11, a coated plate;
  • the composite light guide plate 10 provided in this embodiment includes a light guide plate main body 101 and a reflective film 102 .
  • the side surface of the light guide plate main body 101 is formed with a mesh point 1011.
  • the upper surface of the light guide plate main body 101 is a light-emitting surface, that is, light is transmitted from the upper surface of the light guide plate main body 101 toward the display panel, and the halftone dots 1011 are disposed on the lower surface of the light guide plate main body 101.
  • the halftone dot 1011 is a concave portion formed on the lower surface of the light guide plate main body 101 for propagating the light emitted from the light source and passing through the light guide body toward the light exit surface of the light guide plate main body 101 along a plurality of paths, and the light is emitted from the upper surface of the light guide plate. Again After a series of processing, it is finally emitted in a direction perpendicular to the display panel to display an image on the display panel.
  • the reflective film 102 is disposed on a surface (i.e., a lower surface) of the light guide plate main body 101 having the halftone dots 1011, and the reflective film 102 is disposed to reflect the light reaching the light toward the upper surface of the light guide plate main body 101.
  • the composite light guide plate provided by the present disclosure is an integrated composite light guide plate with a reflective function, which is compared with the prior art in which a reflective sheet is required to be assembled on the lower surface of the light guide plate main body 101 to realize a reflection function.
  • the light board 10 has the following advantages: firstly, a gap between the reflective sheet and the main body of the light guide plate can be avoided, so that part of the light can be prevented from being lost from the gap, thereby enhancing the reflection effect and improving the light utilization efficiency; second, due to the reflective film The thickness is generally thin, which is smaller than the thickness of the reflective sheet in the prior art, so that the thin composite light guide plate can realize the thinning of the backlight module while realizing the functions of the light guide plate main body and the reflective sheet in the prior art; Third, since there is adhesion between the reflective film and the surface of the light guide plate body, the reflective film does not move relative to the main body of the light guide plate, so that there is no risk of the surface contacting the two being scratched, which can be improved.
  • the composite light guide plate body has an integrated structure and is assembled with the existing light guide plate main body and the reflective sheet. This not only simplifies the assembly process of the backlight module, but also simplifies the structure of the backlight module.
  • the reflective film 102 is formed using a polyterephthalic acid material.
  • the reflective film 102 may be formed of other materials as long as it satisfies the condition that the reflective film 102 can reflect light, and is not enumerated here.
  • the reflective film 102 is formed by a coating process, and the coating process not only makes the process simple, but also reduces the input cost, thereby improving economic efficiency.
  • the reflective film 102 may be formed by other methods according to factors such as materials used for the reflective film 102, for example, by using a physical vapor deposition method or a chemical vapor deposition method.
  • the reflective film 102 completely covers the surface (ie, the lower surface) of the light guide plate main body 101 and the outer surface of the concave portion (ie, the concave surface of the concave portion itself), which can realize that the reflective film 102 completely blocks the light loss. Therefore, the utilization of light can be greatly improved.
  • the outer surface (ie, the lower surface) of the reflective film 102 is planar, as shown in FIG. 1, which facilitates the formation of a subsequent process and the mounting of the backlight module.
  • the light guide plate main body 101 having the mesh point 1011 on the surface is formed by hot rolling or injection, and the process of forming the light guide plate main body 101 having the mesh dots 1011 on the surface by hot rolling and injection is performed.
  • the technology is similar and will not be described in detail here.
  • the dot 1011 is a concave portion formed on the surface of the light guide plate main body 101 in the present embodiment, the present disclosure is not limited thereto. In practical applications, the dot 1011 may also be a convex portion formed on the surface of the light guide plate main body 101. In this case, for the same reason as described above, the reflective film 102 completely covers the surface and the convex portion of the light guide plate main body 101.
  • the outer surface, in addition, optionally, the outer surface (ie, the lower surface) of the reflective film is a flat surface, as shown in FIG. 2; in addition, not only all of the plurality of mesh dots 1011 may be concave or convex portions, but also a plurality of mesh dots 1011. One part is a concave part and the other part is a convex part.
  • the present disclosure further provides a backlight module.
  • the backlight module includes a composite light guide plate 10
  • the composite light guide plate 10 uses the composite light guide plate 10 provided by the above embodiment of the present disclosure.
  • the backlight module further includes a light source and a frame, wherein the light source is used for emitting light, mainly a cold cathode fluorescent tube (CCFL) or a light emitting diode (LED), wherein the CCFL is a tubular line light source, and the LED is a point light source (so Generally, multiple LEDs are required to ensure uniform illumination; the frame is used to support light sources, composite light guides, and the like.
  • the light source is used for emitting light
  • CCFL cold cathode fluorescent tube
  • LED light emitting diode
  • the frame is used to support light sources, composite light guides, and the like.
  • the backlight module provided by the embodiment of the present disclosure can improve the light utilization efficiency of the backlight module by using the composite light guide plate provided by another technical solution of the present disclosure, and is easy to realize thinning, simplifying the structure and the assembly process.
  • the present disclosure further provides a display device, which includes a backlight module and a display panel, and the backlight module adopts the backlight module provided by the above embodiments of the present disclosure.
  • the display panel includes a liquid crystal display panel.
  • the display device provided by the embodiment of the present disclosure can improve the light utilization efficiency of the display device by using the backlight module provided by another technical solution of the present disclosure, and is easy to realize thinning, quality of the display screen, and simplified structure and assembly. process.
  • the present disclosure also provides a method for preparing a composite light guide plate
  • 4 is a flowchart of a method for preparing a composite light guide plate according to an embodiment of the present disclosure.
  • a method for preparing a composite light guide plate provided by the embodiment includes the following steps:
  • Step S1 preparing a light guide plate body having a dot formed on one side surface
  • Step S2 A reflective film is formed on the surface of the light guide plate main body having the halftone dots.
  • a mesh dot is formed on a surface opposite to the light-emitting surface of the light guide plate body, and the mesh dot is used for propagating the light emitted from the light source and passing through the light guide body toward the light-emitting surface of the light guide body along a plurality of paths, specifically, the dot It is a concave portion or a convex portion formed on the surface of the light guide plate main body.
  • the light guide plate body having a mesh point on the surface is prepared by hot rolling or injection, and the process of preparing the light guide plate main body having the dot on the surface by hot rolling and injection is similar to the prior art, and is not detailed here. Said.
  • the reflective film completely covers the surface of the light guide body on which it is located (ie, the surface opposite to the light exit surface) and the outer surface of the recess or protrusion (ie, the concave surface of the concave portion or the convex surface of the convex portion), This allows the reflective film to completely block the loss of light, which can greatly improve the utilization of light.
  • the outer surface (ie, the lower surface) of the reflective film is planar, as shown in FIGS. 1 and 2, which facilitates the formation of subsequent processes and the mounting of the backlight module.
  • the reflective film is used to reflect the light reaching the light toward the light-emitting surface of the light guide body to avoid light loss and improve the utilization of light.
  • the reflective film is made of polyethylene terephthalate. The material is formed. In practical applications, the reflective film may be formed of other materials as long as the reflective film can be formed to reflect light, which is not enumerated here.
  • FIG. 5 is a schematic structural view of a process for forming a reflective film by using a coating process.
  • the surface of the light guide plate main body 10 is a process surface, which is disposed toward the coating plate 11, and the coating plate is disposed. 11 is moved from left to right to form a reflective film on the surface of the light guide plate main body 10 where the dots are located.
  • the value indicates that although the present embodiment forms a reflective film by using a coating process in step S2; however, the present disclosure is not limited thereto, and may be formed in other manners according to materials used for the reflective film in practical applications.
  • the reflective film is formed into a reflective film by, for example, physical vapor deposition or chemical vapor deposition.
  • step S3 is further included: curing the reflective film, which can achieve rapid curing and improve curing efficiency relative to self-curing, thereby reducing process time.
  • step S3 the reflective film is cured by ultraviolet lamp irradiation curing, and the curing efficiency can be further improved by irradiation with an ultraviolet lamp.
  • the reflective film may be fixed by other means to improve the curing efficiency, which is not enumerated here.
  • the method for preparing a composite light guide plate firstly prepares a light guide plate main body having a dot formed on one surface by step S1, and then forms a reflective film on the surface having the mesh point by means of step S2.
  • the film is arranged to reflect the light reaching the light toward the light-emitting surface of the light guide plate body, and the composite light guide plate having the reflective film formed on the surface of the mesh point can be prepared by using the preparation method, and the composite light guide plate is an integrated and reflective composite.
  • the light guide plate (as shown in FIG.
  • the reflective sheet has the following advantages as compared with the prior art in which the reflective sheet is assembled on the lower surface of the light guide plate body to realize the reflection function: First, the existence between the reflective sheet and the light guide plate body can be avoided. The gap can prevent part of the light from escaping from the gap, thereby enhancing the reflection effect and improving the light utilization efficiency. Second, since the thickness of the reflective film is generally thin, it is smaller than the thickness of the reflective sheet in the prior art, thereby adopting a thin composite The light guide plate can realize the backlight while realizing the function of the light guide plate main body and the reflection sheet in the prior art.
  • the thinning of the module third, based on the adhesion between the reflective film and the surface of the main body of the light guide plate, the reflective film does not move relative to the main body of the light guide plate, so that the surface in contact with the two is not
  • the risk of scratching can improve the quality of the display screen of the display panel.
  • the reflective film regardless of whether the light guide plate body is warped or not, the reflective film is always attached to the surface of the light guide plate body, and wrinkles are not generated, thereby further improving the display panel.
  • the quality of the display screen; fifthly, the composite light guide body is an integrated structure, which not only simplifies the assembly process of the backlight module, but also simplifies the structure of the backlight module compared with the existing light guide plate body and the reflection sheet assembly. .

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Abstract

一种复合导光板(10)及其制备方法、背光模组、显示装置。该复合导光板(10)包括导光板主体(101)和反射薄膜(102)，导光板主体(101)的一侧表面形成有网点(1011)，在导光板主体(101)的具有网点(1011)的表面上形成有反射薄膜(102)，反射薄膜(102)被设置为将到达其的光线朝向导光板主体(101)的出光面反射。该复合导光板(10)不仅可以提高光反射效果，且易于背光模组的薄形化设计以及简化背光模组的组装过程和结构。

Description

复合导光板及其制备方法、背光模组、显示装置
相关申请的交叉引用
本申请主张在2015年3月3日在中国提交的中国专利申请号No.201510094694.4的优先权，其全部内容通过引用包含于此。
技术领域
本公开属于液晶显示技术领域，具体涉及一种复合导光板及其制备方法、背光模组、显示装置。
背景技术
导光板是背光模组中将点光源和线光源转化为面光源的主要部件，可应用于液晶显示器、笔记本电脑、数码相机、监视器以及投影仪等平面显示设备中，用于提供均匀亮度的面光源输出，使平面显示设备能够正常显示影像。并且，发光二极管(Light Emitting Diode，以下简称LED)越来越多的作为背光源中导光板的光源。
目前，通常在组装背光模组时，在导光板的下表面上组装有反射片，反射片用于将到达导光板下表面的光线朝向导光板上表面反射，以避免光线自导光板的下表面流失，从而可以提高光的利用率。
然而，采用上述背光模组在实际应用中仍然有进一步改善光线利用率和改善显示质量的需要。
发明内容
本公开旨在至少解决现有技术中存在的技术问题之一，提出了一种复合导光板及其制备方法、背光模组、显示装置，复合导光板为一体化且具有反射功能的复合导光板，不仅可以提高光反射效果，且易于背光模组的薄型化设计以及简化背光模组的组装过程和结构，从而可以提高显示装置的光利用率，且易于实现薄型化以及简化结构和组装过程；而且还可以避免导光板主体被划伤和反射片发生褶皱，从而可以提高显示装置的显示画面的品质。
为解决上述问题之一，本公开提供了一种复合导光板，包括导光板主体以及反射薄膜，所述导光板主体的一侧表面设置有网点，所述反射薄膜设置在所述导光板主体的具有网点的表面上，所述反射薄膜被设置为将到达其的 光线朝向所述导光板主体的出光面反射。
其中，所述反射薄膜采用聚对苯二甲酸类材料形成。
其中，所述反射薄膜采用涂覆工艺形成。
其中，采用热滚压或射出方式形成一侧表面具有网点的导光板。
其中，所述网点为在所述导光板主体表面形成的凹部或凸部。
其中，所述反射薄膜完全覆盖其所在的所述导光板主体的表面和所述凹部或凸部的外表面。
其中，所述反射薄膜的外表面为平面。
作为另外一个技术方案，本公开还提供一种背光模组，所述背光模组包括复合导光板，所述复合导光板采用本公开另一技术方案提供的复合导光板。
作为另外一个技术方案，本公开还提供一种显示装置，所述显示装置包括背光模组和显示面板，背光模组采用本公开另一技术方案提供的背光模组。
作为另外一个技术方案，本公开还提供一种复合导光板的制备方法，包括以下步骤：步骤S1：制备一侧表面形成有网点的导光板主体；步骤S2：在所述导光板主体的具有网点的表面上形成有反射薄膜。
其中，在步骤S2中，采用涂覆工艺形成所述反射薄膜。
其中，所述反射薄膜采用聚对苯二甲酸类材料形成。
其中，在步骤S2之后还包括步骤S3：固化所述反射薄膜。
其中，在步骤S3中，采用紫外灯照射固化方式固化该所述反射薄膜。
其中，在步骤S1中，采用热滚压或射出方式制备所述表面具有网点的导光板主体。
其中，所述网点为形成于所述导光板主体表面的凹部或凸部。
其中，所述反射薄膜的外表面为平面。
本公开具有以下有益效果：
本公开提供的复合导光板，其在导光板主体的具有网点的表面上形成有反射薄膜，反射薄膜被设置成将到达其的光线朝向导光板主体的出光面反射。由此可知，本公开提供的复合导光板为一体式、具有反射功能的复合导光板，这与现有技术中需要在导光板主体下表面组装反射片实现反射功能相比，该复合导光板存在以下优势：第一，可以避免反射片与导光板主体之间存在间 隙，因而可以避免部分光自该间隙流失，从而可以增强反射效果，提高光利用率；第二，由于反射薄膜的厚度一般很薄，小于现有技术中反射片的厚度，从而采用薄型的复合导光板在可以实现现有技术中导光板主体和反射片的作用的同时还可以实现背光模组的薄型化；第三，由于反射薄膜与其所在的导光板主体的表面之间存在附着力，因此，反射薄膜不会与导光板主体发生相对移动，从而不存在二者相接触的表面被刮伤的风险，可以提高显示面板的显示画面的品质；第四，无论导光板主体是否发生曲翘，反射薄膜始终附着在导光板主体表面上，不会发生褶皱，从而可以进一步提高显示面板的显示画面的品质；第五，该复合导光板为一体式结构，与现有的导光板主体和反射片组装相比，不仅简化背光模组的组装过程，而且还可以简化背光模组的结构。
本公开提供的背光模组，其采用本公开另一技术方案提供的复合导光板，可以提高背光模组的光利用率，且易于实现薄型化以及简化结构和组装过程。
本公开提供的显示装置，其采用本公开另一技术方案提供的背光模组，可以提高显示装置的光利用率，且易于实现薄型化，提高显示画面的品质以及简化结构和组装过程。
本公开提供的复合导光板的制备方法，其先借助步骤S1制备一侧表面形成有网点的导光板主体，再借助步骤S2在导光板主体的具有网点的表面上形成有反射薄膜，反射薄膜被设置成将到达其的光线朝向导光板主体的出光面反射，采用该制备方法可以制备在网点所在表面上形成有反射薄膜的复合导光板，该复合导光板为一体式、具有反射功能的复合导光板，其与现有技术中需要在导光板主体下表面组装反射片实现反射功能相比，存在以下优势：第一，可以避免反射片与导光板主体之间存在间隙，因而可以避免部分光自该间隙流失，从而可以增强反射效果，提高光利用率；第二，由于反射薄膜的厚度一般很薄，小于现有技术中反射片的厚度，从而采用薄型的复合导光板可以在实现现有技术中导光板主体和反射片的作用的同时还可以实现背光模组的薄型化；第三，由于反射薄膜与其所在的导光板主体的表面之间存在附着力，因此，反射薄膜不会与导光板主体发生相对移动，从而不存在二者相接触的表面被刮伤的风险，可以提高显示面板的显示画面的品质；第四， 无论导光板主体是否发生曲翘，反射薄膜始终附着在导光板主体表面上，不会发生褶皱，从而可以进一步提高显示面板的显示画面的品质；第五，该复合导光板主体为一体式结构，与现有的导光板主体和反射片组装相比，不仅简化背光模组的组装过程，而且还可以简化背光模组的结构。
附图说明
图1为本公开实施例提供的第一种复合导光板的剖视图；
图2为本公开实施例提供的第二种复合导光板的剖视图；
图3为本公开实施例提供的背光模组的部分剖视图；
图4为本公开实施例提供的复合导光板的制备方法的流程图；以及
图5为采用涂覆工艺在形成反射薄膜过程中的结构示意图。
其中，附图标记为：10、复合导光板；101、导光板主体；1011、网点；102、反射薄膜；11、涂覆板；12、腔室。
具体实施方式
为使本领域的技术人员更好地理解本公开的技术方案，下面结合附图来对本公开提供的复合导光板及其制备方法、背光模组、显示装置进行详细描述。所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的组件或具有相同或类似功能的组件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
在本公开的描述中，需要理解的是，术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或组件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。
图1为本公开实施例提供的第一种复合导光板的剖视图。请参阅图1，本实施例提供的复合导光板10包括导光板主体101以及反射薄膜102。其中，导光板主体101的一侧表面形成有网点1011。如图1所示，导光板主体101的上表面为出光面，即，光线自导光板主体101的上表面朝向显示面板传输，网点1011设置在导光板主体101的下表面上。具体地，网点1011为导光板主体101下表面形成的凹部，用于将由光源发出且射向导光板主体光线沿多个路径朝向导光板主体101的出光面传播，光线自导光板的上表面射出后再 经过一系列的处理最后沿垂直于显示面板的方向射出，以在显示面板上显示影像。并且，反射薄膜102设置在导光板主体101的具有网点1011的表面(即，下表面)上，反射薄膜102被设置成将到达其的光线朝向导光板主体101上表面反射。
由此可知，本公开提供的复合导光板为一体式、具有反射功能的复合导光板，这与现有技术中需要在导光板主体101下表面组装反射片来实现反射功能相比，该复合导光板10存在以下优势：第一，可以避免反射片与导光板主体之间存在间隙，因而可以避免部分光自该间隙流失，从而可以增强反射效果，提高光利用率；第二，由于反射薄膜的厚度一般很薄，小于现有技术中反射片的厚度，从而采用薄型的复合导光板在可以实现现有技术中导光板主体和反射片的作用的同时还可以实现背光模组的薄型化；第三，由于反射薄膜与其所在的导光板主体的表面之间存在附着力，因此，反射薄膜不会与导光板主体发生相对移动，从而不存在二者相接触的表面被刮伤的风险，可以提高显示面板的显示画面的品质；第四，无论导光板主体是否发生曲翘，反射薄膜始终附着在导光板主体表面上，不会发生褶皱，从而可以进一步提高显示面板的显示画面的品质；第五，该复合导光板主体为一体式结构，与现有的导光板主体和反射片组装相比，不仅简化背光模组的组装过程，而且还可以简化背光模组的结构。
在本实施例中，具体地，反射薄膜102采用聚对苯二甲酸类材料形成。但是，在实际应用中，反射薄膜102还可以采用其他材料形成，只要实现满足反射薄膜102能够反射光线的条件即可，在此不一一列举。
并且，反射薄膜102采用涂覆工艺形成，采用涂覆工艺不仅使得工艺简单，而且还降低投入成本，从而可以提高经济效益。当然，在实际应用中，还可以根据反射薄膜102所采用材料等因素，采用其他方式形成该反射薄膜102，例如，采用物理气相沉积方式或化学气相沉积方式等方式形成反射薄膜102。
可选地，反射薄膜102完全覆盖其所在的导光板主体101表面(即，下表面)和凹部的外表面(即，凹部本身的内凹表面)，这可以实现反射薄膜102彻底地阻挡光线流失，从而可以在很大程度上提高光的利用率。
进一步可选地，反射薄膜102的外表面(即，下表面)为平面，如图1所示，这可以便于后续工艺的形成和背光模组的安装。
另外，在本实施例中，采用热滚压或射出方式形成上述表面具有网点1011的导光板主体101，由于热滚压和射出方式制成表面具有网点1011的导光板主体101的过程与现有技术相类似，在此不再详述。
需要说明的是，尽管在本实施例中网点1011为导光板主体101表面形成的凹部；但是，本公开并不局限于此。在实际应用中，网点1011还可以为导光板主体101表面形成的凸部，在此情况下，基于上述相同的理由，可选地，反射薄膜102完全覆盖导光板主体101的表面和凸部的外表面，另外可选地，反射薄膜的外表面(即，下表面)为平面，如图2所示；另外，不仅可以全部多个网点1011为凹部或凸部，还可以多个网点1011中一部分为凹部，另一部分为凸部。
作为另外一个技术方案，本公开还提供一种背光模组，请参阅图3，该背光模组包括复合导光板10，复合导光板10采用本公开上述实施例提供的复合导光板10。
具体地，背光模组还包括光源和框架，其中，光源用于发光，主要为冷阴极荧光管(CCFL)或发光二极管(LED)，其中，CCFL为管状的线光源，LED为点光源(故一般需要多个LED以保证发光均匀)；框架用于支撑光源、复合导光板等。
本公开实施例提供的背光模组，由于其采用本公开另一技术方案提供的复合导光板，因此，可以提高背光模组的光利用率，且易于实现薄型化，简化结构和组装过程。
作为另外一个技术方案，本公开还提供一种显示装置，显示装置包括背光模组和显示面板，背光模组采用本公开上述实施例提供的背光模组。
具体地，显示面板包括液晶显示面板。
本公开实施例提供的显示装置，由于其采用本公开另一技术方案提供的背光模组，因此，可以提高显示装置的光利用率，且易于实现薄型化，显示画面的品质以及简化结构和组装过程。
作为另外一个技术方案，本公开还提供一种复合导光板的制备方法，图 4为本公开实施例提供的复合导光板的制备方法的流程图，请参阅图4，本实施例提供的复合导光板的制备方法包括以下步骤：
步骤S1：制备一侧表面形成有网点的导光板主体；
步骤S2：在导光板主体的具有网点的表面上形成有反射薄膜。
在步骤S1中，在导光板主体的出光面相对的表面上形成有网点，网点用于将由光源发出且射向导光板主体的光线沿多个路径朝向导光板主体的出光面传播，具体地，网点为形成于导光板主体表面的凹部或凸部。
另外，具体地，采用热滚压或射出方式制备表面具有网点的导光板主体，由于热滚压和射出方式制备表面具有网点的导光板主体的过程与现有技术相类似，在此不再详述。
可选地，反射薄膜完全覆盖其所在的导光板主体表面(即，与出光面相对的表面)和凹部或凸部的外表面(即，凹部的内凹表面或凸部的外凸表面)，这可以实现反射薄膜彻底地阻挡光线流失，从而可以在很大程度上提高光的利用率。
另外可选地，反射薄膜的外表面(即，下表面)为平面，如图1和图2所示，这可以便于后续工艺的形成和背光模组的安装。
在步骤S2中，反射薄膜用于将到达其的光线朝向导光板主体的出光面反射，以避免光流失，提高光的利用率，具体地，本实施例中，反射薄膜采用聚对苯二甲酸类材料形成，在实际应用中，反射薄膜还可以采用其他材料形成，只要能够实现形成的反射薄膜能够反射光线即可，在此不一一列举。
另外，由于涂覆工艺较简单，且投入成本较低，因此，在步骤S2中，采用涂覆工艺形成反射薄膜，从而可以提高经济效益。请参阅图5，图5为采用涂覆工艺在形成反射薄膜过程中结构示意图，在腔室12内，导光板主体10的网点所在的表面为工艺面，朝向涂覆板11设置，涂覆板11自左向右移动，实现在导光板主体10的网点所在的表面上形成反射薄膜。
值的说明的是，尽管本实施例在步骤S2中采用涂覆工艺形成反射薄膜；但是，本公开并不局限于此，在实际应用中，还可以根据反射薄膜所采用材料，采用其他方式形成该反射薄膜，例如，采用物理气相沉积方式或化学气相沉积方式等方式形成反射薄膜。
可选地，在步骤S2之后还包括步骤S3：固化反射薄膜，这相对自行固化而言，可以实现快速地固化，提高固化效率，从而可以减小工艺时间。
进一步可选地，在步骤S3中，采用紫外灯照射固化方式固化该反射薄膜，采用紫外灯照射可以进一步提高固化效率。在实际应用中，还可以采用其他方式固定反射薄膜，以提高固化效率，在此不一一列举。
由上可知，本公开实施例提供的复合导光板的制备方法，其先借助步骤S1制备一侧表面形成有网点的导光板主体，再借助步骤S2在具有网点的表面上形成有反射薄膜，反射薄膜设置成将到达其的光线朝向导光板主体的出光面反射，采用该制备方法可以制备在网点所在表面上形成有反射薄膜的复合导光板，该复合导光板为一体式、具有反射功能的复合导光板(如图1所示)，其与现有技术中需要在导光板主体下表面组装反射片实现反射功能相比，存在以下优势：第一，可以避免反射片与导光板主体之间存在间隙，因而可以避免部分光自该间隙流失，从而可以增强反射效果，提高光利用率；第二，由于反射薄膜的厚度一般很薄，小于现有技术中反射片的厚度，从而采用薄型的复合导光板在可以实现现有技术中导光板主体和反射片的作用的同时还可以实现背光模组的薄型化；第三，基于反射薄膜与其所在的导光板主体的表面之间存在附着力，因此，反射薄膜不会与导光板主体发生相对移动，从而不存在二者相接触的表面被刮伤的风险，可以提高显示面板的显示画面的品质；第四，无论导光板主体是否发生曲翘，反射薄膜始终附着在导光板主体表面上，不会发生褶皱，从而可以进一步提高显示面板的显示画面的品质；第五，该复合导光板主体为一体式结构，与现有的导光板主体和反射片组装相比，不仅简化背光模组的组装过程，而且还可以简化背光模组的结构。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开的保护范围。

Claims (17)

  1. 一种复合导光板，包括导光板主体以及反射薄膜，所述导光板主体的一侧表面设置有网点，所述反射薄膜设置在所述导光板主体的具有网点的表面上，所述反射薄膜被设置为将到达其的光线朝向所述导光板主体的出光面反射。
  2. 根据权利要求1所述的复合导光板，其中，所述反射薄膜采用聚对苯二甲酸类材料形成。
  3. 根据权利要求1所述的复合导光板，其中，所述反射薄膜采用涂覆工艺形成。
  4. 根据权利要求1所述的复合导光板，其中，采用热滚压或射出方式形成一侧表面具有网点的导光板。
  5. 根据权利要求1所述的复合导光板，其中，所述网点为在所述导光板主体表面形成的凹部或凸部。
  6. 根据权利要求5所述的复合导光板，其中，所述反射薄膜完全覆盖其所在的所述导光板主体的表面和所述凹部或凸部的外表面。
  7. 根据权利要求1-6任意一项所述的复合导光板，其中，所述反射薄膜的外表面为平面。
  8. 一种背光模组，其中，所述背光模组包括复合导光板，所述复合导光板采用权利要求1-7任意一项所述的复合导光板。
  9. 一种显示装置，所述显示装置包括背光模组和显示面板，其中，背光模组采用权利要求8所述的背光模组。
  10. 一种复合导光板的制备方法，包括以下步骤：
    步骤S1：制备一侧表面形成有网点的导光板主体；
    步骤S2：在所述导光板主体的具有网点的表面上形成有反射薄膜。
  11. 根据权利要求10所述的复合导光板的制备方法，其中，在步骤S2中，采用涂覆工艺形成所述反射薄膜。
  12. 根据权利要求11所述的复合导光板的制备方法，其中，所述反射薄膜采用聚对苯二甲酸类材料形成。
  13. 根据权利要求10所述的复合导光板的制备方法，其中，在步骤S2之后还包括步骤S3：固化所述反射薄膜。
  14. 根据权利要求13所述的复合导光板的制备方法，其中，在步骤S3中，采用紫外灯照射固化方式固化所述反射薄膜。
  15. 根据权利要求10所述的复合导光板的制备方法，其中，在步骤S1中，采用热滚压或射出方式制备所述表面具有网点的导光板主体。
  16. 根据权利要求10所述的复合导光板的制备方法，其中，所述网点为形成于所述导光板主体表面的凹部或凸部。
  17. 根据权利要求10-16任意一项所述的复合导光板的制备方法，其中，所述反射薄膜的外表面为平面。
PCT/CN2015/085953 2015-03-03 2015-08-03 复合导光板及其制备方法、背光模组、显示装置 WO2016138736A1 (zh)

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