WO2016086594A1 - 一种导光板及其制备方法、背光模组 - Google Patents

一种导光板及其制备方法、背光模组 Download PDF

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Publication number
WO2016086594A1
WO2016086594A1 PCT/CN2015/078447 CN2015078447W WO2016086594A1 WO 2016086594 A1 WO2016086594 A1 WO 2016086594A1 CN 2015078447 W CN2015078447 W CN 2015078447W WO 2016086594 A1 WO2016086594 A1 WO 2016086594A1
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WIPO (PCT)
Prior art keywords
guide plate
light guide
light
plate body
pulsed laser
Prior art date
Application number
PCT/CN2015/078447
Other languages
English (en)
French (fr)
Inventor
李�瑞
于洪俊
朱红
宋勇
张宏坤
龙君
杨刚
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/785,601 priority Critical patent/US9791615B2/en
Priority to EP15777599.0A priority patent/EP3229050A4/en
Publication of WO2016086594A1 publication Critical patent/WO2016086594A1/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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • 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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/16—Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
    • 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
    • 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
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • 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
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/009—Using laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0075—Light guides, optical cables

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a light guide plate, a preparation method thereof, and a backlight module.
  • the backlight module includes a light guide plate 01, a reflection sheet 02, a light source 03, a light source reflection cover 04, a diffusion plate 05, a lower prism film 06, and an upper prism film 07.
  • the light guide plate 01 is provided with a dot 011 on the surface of the reflection sheet 02, and the reflection sheet 02 is located on a side of the light guide plate 01 facing away from the diffusion plate 05.
  • the light guide plate 01 is located outside the light guide plate 01 on the surface of the reflective sheet 02. After the backlight module is assembled, the dot 011 on the light guide plate 01 is in direct contact with the reflective sheet 02. When the backlight module is relatively moved due to vibration during transportation or use, the dot 011 and the reflection sheet 02 on the light guide plate 01 are scratched each other, thereby causing the backlight module to have a short service life and affecting the backlight module. Brightness uniformity.
  • the embodiment of the invention provides a light guide plate, a preparation method thereof and a backlight module, which can extend the service life of the backlight module and ensure the uniformity of the light output of the backlight module.
  • a light guide plate of a backlight module comprising: a light guide plate body and a mesh point, wherein the light guide plate body is provided with a light-emitting surface, and a surface of the light guide plate body facing away from the light-emitting surface thereof is formed with a receiving groove for accommodating the light source, and the receiving
  • the side surface and the bottom surface of the groove form a light incident surface
  • the mesh dots are distributed inside the light guide plate body along a plane parallel to the light exit surface, and the distribution density of the mesh dots is larger as the distance from the light incident surface is larger.
  • the light source When the light guide plate is in use, the light source is located in a receiving groove formed on a surface of the light guide plate body facing away from the light emitting surface thereof, and the light emitted by the light source is introduced into the light guide plate through the side surface and the bottom surface of the receiving groove, and The greater the distribution density of the far-point dots, the uniformity of the light emitted from the light-emitting surface of the light guide plate body can be ensured; and since the dots are located at the guide Inside the light board body, the dot of the light guide plate and the reflection sheet of the backlight module do not rub against each other, thereby prolonging the service life of the backlight module.
  • a line connecting a center point of the bottom surface of the receiving groove and a center point of the light-emitting surface is perpendicular to the light-emitting surface.
  • each of said dots satisfies the following formula:
  • D is the distance between the mesh point and the light exit surface
  • d is the distance between the mesh point and the surface of the light guide plate body that faces away from the light exit surface.
  • the embodiment of the present invention further provides a backlight module, including a reflective sheet and a light source, and further includes any one of the light guide plates provided by the above technical party, and the light emitting direction of the light source is opposite to the light incident surface of the light guide plate, and
  • the reflective sheet is located on a side of the light guide plate that faces away from the light exit surface of the light guide plate.
  • the embodiment of the invention further provides a method for preparing a light guide plate provided in the above technical solution, comprising:
  • the pulse laser component is turned on, and the light guide plate body is driven by the worktable to melt the material in the light guide plate and the position of the focus of the laser pulse to form a mesh point, and the distribution density of the mesh point is larger as the distance from the light incident surface of the light guide plate is larger.
  • the pulsed laser assembly comprises a pulsed laser emitter and a collecting lens, the collecting lens being located between the pulsed laser emitter and the table; the adjusting pulsed laser assembly for emitting the pulsed laser component
  • the focus of the laser pulse is located in the body of the light guide plate for forming the height of the dot, and specifically includes:
  • the position of the collecting lens is adjusted in a direction perpendicular to the light emitting surface of the light guide plate body to adjust the height of the spot in the light guide plate body after the laser pulse emitted by the pulsed laser emitter passes through the collecting lens.
  • the workbench includes a fixing base, a translation stage mounted on the fixing seat and slidable relative to the fixing seat in a direction parallel to the light emitting surface of the light guide plate body, mounted on the translation stage and translatable relative to the translation
  • the table rotates along an axis perpendicular to the light exit surface of the light guide body
  • the adjustment workbench to adjust the initial position of the focus of the laser pulse emitted by the pulsed laser component relative to the light guide body, specifically includes:
  • the position of the translation stage relative to the fixed seat is adjusted such that the line between the focus of the laser pulse emitted by the pulsed laser assembly and the center point of the bottom surface of the light receiving plate body is perpendicular to the light exit surface of the light guide plate body.
  • the pulse laser component is turned on, and the light guide plate body is driven by the worktable to melt the material in the light guide plate and the position of the focus of the laser pulse to form a mesh point, and the farther from the light incident surface of the light guide plate, the dot point
  • the specifics include:
  • the pulsed laser assembly emits a laser pulse at a constant frequency
  • n is the rotational speed of the turntable
  • k is the set constant
  • v is the moving speed of the translation stage
  • m is the set constant
  • L1 is the length of the diagonal of the light guide plate
  • d1 is the focus of the laser pulse emitted by the pulsed laser component. The distance between the straight line passing through the center point of the bottom surface of the receiving groove and perpendicular to the light exit surface of the light guide plate.
  • the pulse laser component is turned on, and the light guide plate body is driven by the worktable to melt the material in the light guide plate and the position of the focus of the laser pulse to form a mesh point, and the farther from the light incident surface of the light guide plate, the dot point
  • the specifics include:
  • the pulsed laser assembly emits a laser pulse at a constant frequency
  • n is the rotation speed of the turntable
  • D1 is the distance moved by the translation stage
  • k is the set constant
  • j is the set constant
  • L1 is the length of the diagonal of the light guide plate
  • d1 is the pulse laser component emission before each movement. The distance between the focus of the laser pulse and the line passing through the center point of the bottom surface of the receiving groove and perpendicular to the light exit surface of the light guide plate.
  • FIG. 1 is a schematic structural view of a backlight module in the prior art
  • FIG. 2 is a schematic structural diagram of a light guide plate according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of distribution of dots in a light guide plate according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of distribution of dots in a light guide plate according to another embodiment of the present invention.
  • FIG. 5 is a schematic flow chart of a method for preparing a light guide plate according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of an apparatus used in a method for preparing a light guide plate according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a light guide plate according to an embodiment of the present invention.
  • the light guide plate 1 of the backlight module provided by the embodiment of the present invention includes a light guide plate body 11 and a mesh point 113.
  • the light guide plate body 11 is provided with a light emitting surface 112.
  • the surface of the light guide plate body 11 facing away from the light emitting surface 112 thereof
  • a receiving groove for accommodating the light source is formed, and the side surface and the bottom surface of the receiving groove form a light incident surface 111, as shown in FIG. 2;
  • the mesh point 113 of the light guide plate is distributed on the light guide plate body 11 along a plane parallel to the light exit surface 112. The greater the distribution density of the mesh points 113, the greater the distance from the light entrance surface 111, as shown in FIGS. 3 and 4.
  • the light source When the light guide plate 1 is in use, the light source is located in a receiving groove formed on the surface of the light guide plate body 11 facing away from the light emitting surface thereof, and the light emitted by the light source is introduced into the light guide plate through the side surface and the bottom surface of the receiving groove, and The farther the surface 111 is, the greater the distribution density of the dots 113 (as shown in FIG. 3 and FIG. 4), so that the uniformity of the light emitted from the light-emitting surface 112 of the light guide body 11 can be ensured.
  • the light source in the backlight module is embedded in the accommodating groove, and the light source may be an LED lamp.
  • the light emitted by the LED lamp is introduced into the light guide plate 1 from the bottom surface and the side surface of the accommodating groove, and the light is propagated in the light guide plate 1 and guided.
  • the upper surface (ie, the light exit surface) of the light plate 1 is transmitted and reflected; part of the reflected light propagates to the mesh point 113 of the light guide plate 1 to be scattered, and a part of the light is emitted from the light guide plate 1 and is reflected back to the light guide plate 1 by the reflective sheet 1 It continues to propagate inside the light guide plate 1 until it is scattered by the mesh point 113 out of the light guide plate 1.
  • the dot 113 is located inside the light guide body 11, the dot 113 of the light guide plate 1 and the reflective sheet of the backlight module do not rub against each other, thereby prolonging the service life of the backlight module.
  • the backlight module using the above-mentioned light guide plate requires less light sources, has low power consumption, and can simplify the structure of the periphery of the light guide plate 1 in the backlight module.
  • the light source is embedded in the receiving groove without increasing the thickness of the backlight module.
  • the line between the center point of the bottom surface of the receiving groove and the center point of the light-emitting surface 112 is perpendicular to the light-emitting surface 112.
  • the axis line of the receiving groove coincides with the axis line of the light guide plate body 11, so that the light source is located on the light guide plate body.
  • the positive center can reduce the complexity of providing the dots 113 in the light guide body 11, and is beneficial to improve the brightness uniformity of the light-emitting surface of the light guide.
  • each of the dots 113 satisfies the following formula:
  • D is the distance between the mesh point 113 and the light-emitting surface 112
  • d is the distance between the mesh point 113 and the surface of the light guide plate body 11 that faces away from the light-emitting surface 112.
  • the obstruction of the light transmission in the light guide plate body 11 by the dots 113 can be reduced, thereby improving the utilization of the light introduced into the light guide plate body 11 by the light source. Improve the brightness uniformity of the backlight module.
  • the embodiment of the present invention further provides a backlight module, including a reflective sheet and a light source, and further includes any one of the light guide plates provided in the above embodiments, the light emitting direction of the light source is opposite to the light incident surface of the light guide plate, and the reflective sheet is located The side of the light guide plate that faces away from the light exit surface of the light guide plate.
  • an embodiment of the present invention further provides a method for preparing a light guide plate 1 provided in the above embodiments, including:
  • step S501 the light guide plate body is fixed to the worktable 3, and the surface of the light guide plate body facing away from the work surface is a light-emitting surface, and the surface of the light guide plate body facing away from the light-emitting surface thereof is provided with the above-mentioned receiving groove for accommodating the light source;
  • Step S502 adjusting the pulsed laser assembly 2 so that the focus of the laser pulse emitted by the pulsed laser assembly 2 is located in the light guide body for forming the height of the dot, and adjusting the table 3 to adjust the laser pulse emitted by the pulsed laser assembly 2.
  • Step S503 the pulse laser component is turned on, and the light guide plate body is driven by the worktable to melt the material in the light guide plate and the position of the focus of the laser pulse to form a mesh point. And the farther away from the light incident surface of the light guide plate, the greater the distribution density of the dots.
  • the dot 113 of the light guide plate 1 can be prepared in the light guide plate body 11; therefore, the dot 113 of the light guide plate 1 and the reflection sheet of the backlight module do not rub against each other, thereby extending the backlight. The service life of the module.
  • the pulse laser component 2 used in the above step S502 includes a pulsed laser emitter 21 and a collecting lens 22, and the collecting lens 22 is located between the pulsed laser emitter 21 and the table 3; at this time, step S502
  • the adjustment of the pulsed laser assembly 2 is performed such that the focus of the laser pulse emitted by the pulsed laser assembly 2 is located in the body of the light guide plate for forming the height of the dot, and specifically includes:
  • the position of the collecting lens 22 is adjusted in a direction perpendicular to the light emitting surface of the light guide plate body to adjust the height at which the focus is located in the light guide plate body after the laser pulse emitted from the pulsed laser emitter 21 passes through the collecting lens 22.
  • the table 3 includes a fixing base 33 , a translation table 32 mounted on the fixing base 33 and slidable relative to the fixing seat 33 in a direction parallel to the light emitting surface of the light guide body, and mounted on the sliding table 32
  • the translation stage 32 is rotatable relative to the translation stage 32 along an axis perpendicular to the axis of the light exit surface of the light guide plate.
  • the moving direction of the translation stage 32 relative to the fixed base 33 is as shown in the direction b in FIG.
  • the rotation direction of the table 32 is as shown in the direction a in FIG.
  • the adjustment table 3 performed in the above step S502 To adjust the initial position of the focus of the laser pulse emitted by the pulsed laser component 2 relative to the body of the light guide plate, specifically:
  • the position of the translation stage 32 relative to the fixed seat 33 is adjusted such that the line between the focus of the laser pulse emitted by the pulsed laser unit 2 and the center point of the bottom surface of the light receiving plate body is perpendicular to the light exit surface of the light guide plate body.
  • the pulse laser unit 2 is turned on in step S503, and the light guide plate body is driven by the worktable 3 to The material in the light guide plate and the position of the focus of the laser pulse is melted to form a mesh point, and the farther away from the light incident surface of the light guide plate, the greater the distribution density of the dot, specifically including:
  • the pulsed laser assembly 2 emits a laser pulse at a constant frequency
  • n is the rotational speed of the turntable
  • k is the set constant
  • v is the moving speed of the translation stage
  • m is the set constant
  • L1 is the length of the diagonal of the light guide plate
  • d1 is the focus of the laser pulse emitted by the pulsed laser component. The distance between the straight line passing through the center point of the bottom surface of the receiving groove and perpendicular to the light exit surface of the light guide plate.
  • the distribution of the dots 113 in the light guide plate 1 obtained at this time is as shown in FIG.
  • the pulse laser unit 2 is turned on in step S503, and the light guide plate body is driven by the worktable 3,
  • the material in the light guide plate and the position of the focus of the laser pulse is melted to form a dot, and the distribution density of the dot is further away from the light incident surface of the light guide plate, and specifically includes:
  • the pulsed laser assembly 2 emits a laser pulse at a constant frequency
  • n is the rotational speed of the turntable 31
  • D1 is the distance moved by the translation stage 32
  • k is the set constant
  • j is the set constant
  • L1 is the length of the diagonal of the light guide plate
  • d1 is the pulse laser before each movement. The distance between the focus of the laser pulse emitted by the assembly 2 and a line passing through the center point of the bottom surface of the receiving groove and perpendicular to the light exit surface of the light guide plate.
  • the distribution of the dots 113 in the light guide plate 1 obtained at this time is as shown in FIG.

Abstract

一种导光板及其制备方法、背光模组；导光板包括导光板本体（11）和网点（113），导光板本体（11）设有出光面（112），导光板本体（11）的背离其出光面（112）的表面形成有用于容纳光源的容纳槽，容纳槽的侧面和底面形成入光面（111），网点（113）沿与出光面（112）平行的平面分布于导光板本体（11）内部，且距离入光面（111）越远网点（113）的分布密度越大。上述导光板在使用时，光源发射的光通过容纳槽的侧面和底面导入导光板内，并且，由于距离入光面（111）越远网点（113）的分布密度越大，从而能够保证导光板本体（11）的出光面（112）出射光线的均匀性；并且，由于网点（113）位于导光板本体（11）的内部，导光板的网点（113）与背光模组的反射片不会相互摩擦，进而延长了背光模组的使用寿命。

Description

一种导光板及其制备方法、背光模组 技术领域
本发明涉及显示技术领域，特别涉及一种导光板及其制备方法、背光模组。
背景技术
现有技术中，背光模组的结构如图1所示，背光模组包括导光板01、反射片02、光源03、光源反射罩04、扩散板05、下棱镜膜06、上棱镜膜07。导光板01朝向反射片02的表面上设有网点011，反射片02位于导光板01背离扩散板05的一侧。
现有的背光模组中，导光板01朝向反射片02的表面上的网点011位于导光板01的外部，背光模组组装之后，导光板01上的网点011会与反射片02直接接触，从而导致背光模组在运输或者使用过程中因振动而发生相对移动时，导光板01上的网点011与反射片02会彼此划伤，从而导致背光模组的使用寿命较短，且影响背光模组的亮度均匀性。
发明内容
本发明实施例提供了一种导光板及其制备方法、背光模组，该导光板能够延长背光模组的使用寿命，且能够保证背光模组出光的均匀性。
为达到上述目的，本发明实施例提供以下技术方案：
一种背光模组的导光板，包括导光板本体和网点，所述导光板本体设有出光面，所述导光板本体的背离其出光面的表面形成有用于容纳光源的容纳槽，所述容纳槽的侧面和底面形成入光面，所述网点沿与所述出光面平行的平面分布于所述导光板本体内部，且距离所述入光面越远所述网点的分布密度越大。
上述导光板在使用时，光源位于导光板本体的背离其出光面的表面上形成的容纳槽内，光源发射的光通过容纳槽的侧面和底面导入导光板内，并且，由于距离入光面越远网点的分布密度越大，从而能够保证导光板本体的出光面出射光线的均匀性；并且，由于网点位于导 光板本体的内部，导光板的网点与背光模组的反射片不会相互摩擦，进而延长了背光模组的使用寿命。
优选地，所述容纳槽底面的中心点与所述出光面的中心点之间的连线与所述出光面垂直。
优选地，每一个所述网点满足下述公式：
D≥4d；其中：
D为网点与出光面之间的距离，d为网点与导光板本体中背离出光面的表面之间的距离。
本发明实施例还提供了一种背光模组，包括反射片、光源，还包括上述技术方那种提供的任意一种导光板，所述光源的出光方向与导光板的入光面相对，且所述反射片位于所述导光板的背离导光板出光面的一侧。
本发明实施例还提供了一种上述技术方案中提供的任意一种导光板的制备方法，包括：
将导光板本体固定于工作台，且导光板本体的背离工作台的表面为出光面，导光板本体的背离其出光面的表面形成有所述容纳槽；
调整脉冲激光器组件、以使脉冲激光器组件发射的激光脉冲的焦点位于导光板本体内用于形成网点的高度，且调整工作台、以调整脉冲激光器组件发射的激光脉冲的焦点相对于导光板本体的初始位置；
开启脉冲激光器组件、且通过工作台带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大。
优选地，所述脉冲激光器组件包括脉冲激光发射器和聚光透镜，所述聚光透镜位于所述脉冲激光发射器和工作台之间；所述调整脉冲激光器组件、以使脉冲激光器组件发射的激光脉冲的焦点位于导光板本体内用于形成网点的高度，具体包括：
沿垂直于导光板本体出光面的方向调整聚光透镜的位置，以调整脉冲激光发射器发射的激光脉冲透过聚光透镜之后焦点位于导光板本体内用于形成网点的高度。
优选地，所述工作台包括固定座、安装于所述固定座且可相对所述固定座沿与所述导光板本体出光面平行的方向滑动的平移台、安装于平移台且可相对于平移台沿垂直于导光板本体出光面的轴心线旋转 的转台，所述导光板本体安装于所述转台；所述调整工作台、以调整脉冲激光器组件发射的激光脉冲的焦点相对于导光板本体的初始位置，具体包括：
调整平移台相对于固定座的位置，以使脉冲激光器组件发射的激光脉冲的焦点与导光板本体上容纳槽底面的中心点之间的连线垂直于导光板本体的出光面。
优选地，所述开启脉冲激光器组件、且通过工作台带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大，具体包括：
所述脉冲激光器组件以恒定频率发射激光脉冲；
按照公式n＝k/d1控制所述转台的转速；
按照公式v＝m*(L1-d1)控制平移台的移动速度；
其中：
n为转台的转速，k为设定的常数，v为平移台的移动速度，m为设定的常数，L1为导光板对角线的长度，d1为脉冲激光器组件发射的激光脉冲的焦点与经过容纳槽底面的中心点、且与导光板出光面垂直的直线之间的距离。
优选地，所述开启脉冲激光器组件、且通过工作台带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大，具体包括：
所述脉冲激光器组件以恒定频率发射激光脉冲；
按照公式n＝k/d1控制所述转台的转速；
所述转台每旋转一周，按照公式D1＝j*(L1-d1)控制平移台向远离容纳槽底面中心点的方向移动一次；
其中：
n为转台的转速，D1为平移台移动的距离，k为设定的已知常数，j为设定的常数，L1为导光板对角线的长度，d1为每次移动之前脉冲激光器组件发射的激光脉冲的焦点与经过容纳槽底面的中心点、且与导光板出光面垂直的直线之间的距离。
附图说明
图1为现有技术中一种背光模组的结构示意图；
图2为本发明一种实施例提供的导光板的结构示意图；
图3为本发明一种实施例提供的导光板中网点的分布示意图；
图4为本发明另一种实施例提供的导光板中网点的分布示意图；
图5为本发明一种实施例提供的导光板制备方法的流程示意图；
图6为本发明一种实施例中提供的导光板制备方法中采用的设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参考图2，图2为本发明一种实施例提供的导光板的结构示意图。
如图2所示，本发明实施例提供的背光模组的导光板1包括导光板本体11和网点113，导光板本体11设有出光面112；导光板本体11的背离其出光面112的表面形成有用于容纳光源的容纳槽，容纳槽的侧面和底面形成入光面111，如图2中所示；导光板设有的网点113沿与出光面112平行的平面分布于导光板本体11的内部，且距离入光面111越远网点113的分布密度越大，具体可以如图3和图4中所示。
上述导光板1在使用时，光源位于导光板本体11的背离其出光面的表面上形成的容纳槽内，光源发射的光通过容纳槽的侧面和底面导入导光板内，并且，由于距离入光面111越远网点113的分布密度越大(具体可以如图3和图4中所示)从而能够保证导光板本体11的出光面112出射光线的均匀性。背光模组中的光源嵌设在容纳槽内，上述光源可以为LED灯，LED灯发射的光线自容纳槽的底面和侧面导入导光板1中，光线在导光板1中进行传播，并在导光板1的上表面(即，出光面)发生透射和反射；反射的光线中，一部分光线传播至导光板1的网点113上发生散射，一部分光线射出导光板1后被反射片反射回导光板1内并继续在导光板1内传播，直至被网点113散射出导光板1。并且，由于网点113位于导光板本体11的内部，导光板1的网点113与背光模组的反射片不会相互摩擦，进而延长了背光模组的使用寿命。
另外，使用上述导光板的背光模组中需要的光源较少，能耗低，并且能够简化背光模组中导光板1周边的结构。同时，光源嵌设在容纳槽内，不会增加背光模组的厚度。
更优选地，容纳槽底面的中心点与出光面112的中心点之间的连线与出光面112垂直。当容纳槽底面的中心点与出光面112的中心点之间的连线与出光面112垂直时，容纳槽的轴心线与导光板本体11的轴心线重合，从而使光源位于导光板本体的正中心，能够减小导光板本体11内设置网点113的复杂程度，并且有利于提高导光板出光面的亮度均匀性。
一种优选实施方式中，为了减小网点113对光线在导光板本体11内传播的阻碍，每一个网点113满足下述公式：
D≥4d；其中：
D为网点113与出光面112之间的距离，d为网点113与导光板本体11中背离出光面112的表面之间的距离。
当导光板本体11内的每一个网点113的分布位置满足上述条件时，能够减小网点113对导光板本体11内光线传播的阻碍，进而提高对光源导入导光板本体11内的光线的利用率，提高背光模组的亮度均匀性。
本发明实施例还提供了一种背光模组，包括反射片、光源，还包括上述实施例中提供的任意一种导光板，光源的出光方向与导光板的入光面相对，且反射片位于导光板的背离导光板出光面的一侧。
如图5和图6所示，本发明一种实施例中还提供了一种上述实施例中提供的任意一种导光板1的制备方法，包括：
步骤S501，将导光板本体固定于工作台3，且导光板本体的背离工作台的表面为出光面，导光板本体的背离其出光面的表面上设有上述用于容置光源的容纳槽；
步骤S502，调整脉冲激光器组件2、以使脉冲激光器组件2发射的激光脉冲的焦点位于导光板本体内用于形成网点的高度，且调整工作台3、以调整脉冲激光器组件2发射的激光脉冲的焦点相对于导光板本体的初始位置；
步骤S503，开启脉冲激光器组件、且通过工作台带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点， 且距离导光板的入光面越远网点的分布密度越大。
采用上述制备方法制备导光板1时，可以将导光板1的网点113制备在导光板本体11内；因此，导光板1的网点113与背光模组的反射片不会相互摩擦，进而延长了背光模组的使用寿命。
请参考图6，上述步骤S502中用到的脉冲激光器组件2包括脉冲激光发射器21和聚光透镜22，聚光透镜22位于脉冲激光发射器21和工作台3之间；此时，步骤S502中进行的调整脉冲激光器组件2、以使脉冲激光器组件2发射的激光脉冲的焦点位于导光板本体内用于形成网点的高度，具体包括：
沿垂直于导光板本体出光面的方向调整聚光透镜22的位置，以调整脉冲激光发射器21发射的激光脉冲透过聚光透镜22之后焦点位于导光板本体内用于形成网点的高度。
请继续参考图6，一种优选实施方式中，工作台3包括固定座33、安装于固定座33且可相对固定座33沿与导光板本体出光面平行的方向滑动的平移台32、安装于平移台32且可相对于平移台32沿垂直于导光板本体出光面的轴心线旋转的转台31，平移台32相对于固定座33的移动方向如图6中方向b，转台31相对于平移台32的旋转方向如图6中所示方向a(即，以图中所示点划线为旋转轴)，导光板本体安装于转台31；此时，上述步骤S502中进行的调整工作台3、以调整脉冲激光器组件2发射的激光脉冲的焦点相对于导光板本体的初始位置，具体包括：
调整平移台32相对于固定座33的位置，以使脉冲激光器组件2发射的激光脉冲的焦点与导光板本体上容纳槽底面的中心点之间的连线垂直于导光板本体的出光面。
一种具体实施方式中，当工作台为具有固定座33、平移台32以及转台31的上述结构时，步骤S503中进行的开启脉冲激光器组件2、且通过工作台3带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大，具体包括：
脉冲激光器组件2以恒定频率发射激光脉冲；
按照公式n＝k/d1控制转台的转速；
按照公式v＝m*(L1-d1)控制平移台的移动速度；
其中：
n为转台的转速，k为设定的常数，v为平移台的移动速度，m为设定的常数，L1为导光板对角线的长度，d1为脉冲激光器组件发射的激光脉冲的焦点与经过容纳槽底面的中心点、且与导光板出光面垂直的直线之间的距离。
此时获得的导光板1中网点113的分布如图3中所示。
另一种具体实施方式中，当工作台为具有固定座33、平移台32以及转台31的上述结构时，步骤S503中进行的开启脉冲激光器组件2、且通过工作台3带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大，具体包括：
脉冲激光器组件2以恒定频率发射激光脉冲；
按照公式n＝k/d1控制转台31的转速；
转台31每旋转一周，按照公式D1＝j*(L1-d1)控制平移台32向远离容纳槽底面中心点的方向移动一次；
其中：
n为转台31的转速，D1为平移台32移动的距离，k为设定的已知常数，j为设定的常数，L1为导光板对角线的长度，d1为每次移动之前脉冲激光器组件2发射的激光脉冲的焦点与经过容纳槽底面的中心点、且与导光板出光面垂直的直线之间的距离。
此时获得的导光板1中网点113的分布如图4所示。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (9)

  1. 一种背光模组的导光板，包括导光板本体和网点，所述导光板本体设有出光面，其特征在于，所述导光板本体的背离其出光面的表面形成有用于容纳光源的容纳槽，所述容纳槽的侧面和底面形成入光面，所述网点沿与所述出光面平行的平面分布于所述导光板本体内部，且距离所述入光面越远所述网点的分布密度越大。
  2. 根据权利要求1所述的导光板，其特征在于，所述容纳槽底面的中心点与所述出光面的中心点之间的连线与所述出光面垂直。
  3. 根据权利要求1或2所述的导光板，其特征在于，每一个所述网点满足下述公式：
    D≥4d；其中：
    D为网点与出光面之间的距离，d为网点与导光板本体的背离出光面的表面之间的距离。
  4. 一种背光模组，包括反射片、光源，其特征在于，还包括如权利要求1～3任一项所述的导光板，所述光源的出光方向与导光板的入光面相对，且所述反射片位于所述导光板的背离导光板出光面的一侧。
  5. 一种如权利要求1～3任一项所述的导光板的制备方法，其特征在于，包括：
    将导光板本体固定于工作台，且导光板本体的背离工作台的表面为出光面，导光板本体的背离其出光面的表面形成有容纳槽；
    调整脉冲激光器组件、以使脉冲激光器组件发射的激光脉冲的焦点位于导光板本体内用于形成网点的高度，且调整工作台、以调整脉冲激光器组件发射的激光脉冲的焦点相对于导光板本体的初始位置；
    开启脉冲激光器组件、且通过工作台带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大。
  6. 根据权利要求5所述的制备方法，其特征在于，所述脉冲激光器组件包括脉冲激光发射器和聚光透镜，所述聚光透镜位于所述脉冲激光发射器和工作台之间；所述调整脉冲激光器组件、以使脉冲激光器组件发射的激光脉冲的焦点位于导光板本体内用于形成网点的高度，具体包括：
    沿垂直于导光板本体出光面的方向调整聚光透镜的位置，以调整脉冲激光发射器发射的激光脉冲透过聚光透镜之后焦点位于导光板本体内用于形成网点的高度。
  7. 根据权利要求5所述的制备方法，其特征在于，所述工作台包括固定座、安装于所述固定座且可相对所述固定座沿与所述导光板本体出光面平行的方向滑动的平移台、安装于平移台且可相对于平移台沿垂直于导光板本体出光面的轴心线旋转的转台，所述导光板本体安装于所述转台；所述调整工作台、以调整脉冲激光器组件发射的激光脉冲的焦点相对于导光板本体的初始位置，具体包括：
    调整平移台相对于固定座的位置，以使脉冲激光器组件发射的激光脉冲的焦点与导光板本体上容纳槽底面的中心点之间的连线垂直于导光板本体的出光面。
  8. 根据权利要求7所述的制备方法，其特征在于，所述开启脉冲激光器组件、且通过工作台带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大，具体包括：
    所述脉冲激光器组件以恒定频率发射激光脉冲；
    按照公式n＝k/d1控制所述转台的转速；
    按照公式v＝m*(L1-d1)控制平移台的移动速度；
    其中：
    n为转台的转速，k为设定的常数，v为平移台的移动速度，m为设定的常数，L1为导光板对角线的长度，d1为脉冲激光器组件发射的激光脉冲的焦点与经过容纳槽底面的中心点、且与导光板出光面垂直的直线之间的距离。
  9. 根据权利要求7所述的制备方法，其特征在于，所述开启脉冲激光器组件、且通过工作台带动导光板本体动作，以使导光板内与激光脉冲的焦点所在位置的材料融化形成网点，且距离导光板的入光面越远网点的分布密度越大，具体包括：
    所述脉冲激光器组件以恒定频率发射激光脉冲；
    按照公式n＝k/d1控制所述转台的转速；
    所述转台每旋转一周，按照公式D1＝j*(L1-d1)控制平移台向远离容纳槽底面中心点的方向移动一次；
    其中：
    n为转台的转速，D1为平移台移动的距离，k为设定的已知常数，j为设定的常数，L1为导光板对角线的长度，d1为每次移动之前脉冲激光器组件发射的激光脉冲的焦点与经过容纳槽底面的中心点、且与导光板出光面垂直的直线之间的距离。
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