WO2013026214A1 - 导光板及其制造方法 - Google Patents

导光板及其制造方法 Download PDF

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Publication number
WO2013026214A1
WO2013026214A1 PCT/CN2011/079135 CN2011079135W WO2013026214A1 WO 2013026214 A1 WO2013026214 A1 WO 2013026214A1 CN 2011079135 W CN2011079135 W CN 2011079135W WO 2013026214 A1 WO2013026214 A1 WO 2013026214A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
scattering
plate body
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PCT/CN2011/079135
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English (en)
French (fr)
Inventor
胡哲彰
黄建发
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深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/378,045 priority Critical patent/US20130050831A1/en
Publication of WO2013026214A1 publication Critical patent/WO2013026214A1/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
    • G02B6/0035—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
    • G02B6/0058—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
    • G02B6/0065—Manufacturing aspects; Material aspects

Definitions

  • the present invention relates to a light guide plate, and more particularly to a light guide plate capable of reducing chromatic aberration and improving light exit efficiency, and a method of manufacturing the same.
  • the liquid crystal display needs to further have a backlight module to supply a surface light source with sufficient and uniform distribution of the liquid crystal panel.
  • the backlight module can be mainly divided into a direct type and a side-in type, wherein the light guide plate is a key component of the side-mounted backlight module to provide a uniform surface light source.
  • the light guide plate transmits light entering from the side of the light guide plate to the distal end of the light guide plate by using the principle of total reflection.
  • a light guide plate design may set the ink dot on the surface of the light guide plate by printing.
  • the ink dot is used to destroy total reflection of incident light, and to scatter incident light to the light exiting surface.
  • Another light guide plate design is to form a microstructure on the surface of the light guide plate, and the micro structure is used to achieve the effect of destroying the total reflection of the incident light.
  • FIG. 1 is a side view showing a light guide plate which is warped by a drying process.
  • the light guide plate 9 printed with ink dots must undergo a drying process to dry the ink dots.
  • the structure of the light guide plate 9 is easily deformed by heat. The deformed light guide structure will affect its optical function.
  • the microstructure is susceptible to its optical function due to scratching.
  • For a large-size backlight module when the micro-structure light guide plate is manufactured by a conventional injection molding device, there is inevitably a problem of uniformity of product quality and microstructure.
  • the invention provides a light guide plate and a manufacturing method thereof, which solve the problems existing in a conventional light guide plate printed with an ink dot or a microstructure.
  • the main object of the present invention is to provide a light guide plate comprising:
  • a light guide plate body having a first side for receiving incident light, and a second side opposite to the first side;
  • a plurality of light guiding scattering portions are formed inside the light guiding plate body and located between the first side and the second side.
  • the laser light is focused by the lens into the light guide plate body, and the laser light is ablated inside the light guide plate body to form the light guiding scattering portion.
  • the light guiding scattering portion is formed by a plurality of scattering columns, and the scattering column is parallel to the first side and the second side of the light guiding plate body, wherein the light guiding scattering in the same scattering column
  • the portions are the same in size, and the direction of the light guiding scattering portion of the scattering column farther from the first side is larger in the direction from the first side to the second side.
  • each of the light guiding scattering portions has the same size, and the light guiding scattering in a unit area away from the first side is in a direction from the first side to the second side. The higher the density of the cloth.
  • the material of the light guide plate body is selected from polymethyl methacrylate or polycarbonate.
  • the invention further provides a method for manufacturing a light guide plate, comprising the following steps:
  • a plurality of light guiding scattering portions are formed inside the light guiding plate body.
  • the laser light is focused by the lens into the light guide plate body, and the laser light is ablated inside the light guide plate body to form the light guiding scattering portion.
  • the light guide plate body has a first side and a second side, the first side is for receiving incident light, and the second side is opposite to the first side;
  • the light guiding portion is formed into a plurality of scattering columns, the scattering columns being parallel to the first side and the second side of the light guiding plate body, wherein the light guiding scattering portions located in the same scattering column are the same size, and in the first The direction of the light guiding scattering portion of the scattering column farther from the first side in the direction toward the second side is larger.
  • the light guide plate body has a first side and a second side, the first side is for receiving incident light, and the second side is opposite to the first side;
  • the light guiding scattering portion has the same size, and in the direction from the first side to the second side, the density of the light guiding scattering portion in the unit area farther from the first side is higher.
  • the material of the light guide plate body is selected from polymethyl methacrylate or polycarbonate.
  • the invention mainly forms a light guide plate body first, and then forms a plurality of light guiding scattering portions by laser ablation inside the light guide plate body, wherein the light guiding scattering portions are arranged according to a certain rule.
  • the light-scattering portion formed by the ablation can reduce the color difference of the light guide plate, avoid the occurrence of bad points, and can improve the light-emitting efficiency.
  • Fig. 1 is a side view showing a light guide plate which is warped by a drying process.
  • Figure 2 is a side cross-sectional view showing a first embodiment of a light guide plate of the present invention.
  • Figure 3 is a perspective view of a first embodiment of a light guide plate of the present invention.
  • Figure 4 is a side cross-sectional view showing a second embodiment of the light guide plate of the present invention.
  • Fig. 5 is a flow chart showing a preferred embodiment of a method of manufacturing a light guide plate according to the present invention.
  • FIG. 2 is a side cross-sectional view showing a first embodiment of a light guide plate according to the present invention
  • FIG. 3 is a perspective view showing a first embodiment of the light guide plate of the present invention.
  • the light guide plate of the present invention mainly comprises a light guide plate body 1 and a plurality of light guiding and scattering portions 2.
  • the light guide plate of the present invention is preferably applied to a side-input type backlight module.
  • the light guide plate body 1 is preferably an injection molded member, and the light guide plate body material is preferably selected from polymethyl methacrylate or polycarbonate, but is not limited thereto.
  • the light guide plate body 1 has a first side 11 and a second side 12.
  • the first side 11 is a light incident side that faces an illumination source for receiving incident light.
  • the second side 12 is opposite the first side 11.
  • the plurality of light guiding and scattering portions 2 are formed in the light guide plate body 1 and located between the first side 11 and the second side 12 .
  • the light guiding and scattering unit 2 can reflect the light incident from the first side 11 into the light guide plate body 1 to a light emitting surface of the light guide plate body 1 .
  • the light guiding scattering portion 2 is preferably formed by ablation of the laser light 3 into the light guide plate body 1 through the lens 30, but the light guiding scattering portion 2 is not limited thereto.
  • the light guiding scattering portion 2 may be disposed inside the light guiding plate body 1 by introducing gas bubbles during the process of forming the light guiding plate body 1.
  • each of the light guiding and scattering portions 2 has the same size, and in the direction from the first side 11 to the second side 12, the farther away from the first side
  • the light-scattering portion 2 per unit area of 11 has a higher distribution density.
  • the light is reflected by the light-scattering portion 2 having a high distribution density, and the amount of light reflected from a region farther from the incident light source can be close to the amount of light reflected from a region closer to the incident light source, thereby averaging the light of the light-emitting surface. dispersion.
  • FIG. 4 it is a side cross-sectional view of a second embodiment of the light guide plate of the present invention.
  • the light guiding scattering portion 2 is divided into a plurality of scattering columns 20, and the scattering columns 20 are parallel to the first side 11 and the second side 12 of the light guiding plate body 1, wherein the light guiding scattering portion 2 of the same scattering column 20 is located.
  • the size is the same, and in the direction from the first side 11 to the second side 12, the size of the light guiding scattering portion 2 that is farther away from the scattering column 20 of the first side 11 is larger.
  • the light is reflected by the large-sized light guiding scattering portion 2, and the amount of light reflected from the region farther from the incident light source can be close to the amount of light reflected from the region closer to the incident light source, thereby evenly distributing the light of the light emitting surface.
  • the arrangement of the light guiding scattering portion 2 of the present invention is not limited to the above two embodiments.
  • FIG. 5 for the manufacturing method of the foregoing light guide plate, which mainly includes the following steps:
  • the light guiding scattering portion 2 is preferably ablated by the laser light 3 by the lens 30, but is not limited thereto.
  • the light guiding scattering portion 2 may be disposed inside the light guiding plate body 1 by introducing gas bubbles during the process of forming the light guiding plate body 1.
  • the light guide plate which is printed with the ink dot is easier to drop ink and has a large chromatic aberration, and the light guide plate having a microstructure on the surface is likely to be affected by scratches to affect its optical function.
  • the light plate forms a light guiding scattering portion inside the light guiding plate body by a laser or the like to avoid scratching, and there is no chromatic aberration problem caused by light absorption loss due to the absence of printing ink. Therefore, the present invention can avoid bad points (dot Mura) produces and improves light emission efficiency and improves energy utilization efficiency.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

一种导光板及其制造方法。所述导光板制造方法主要是先成型一导光板体（1），再于所述导光板体（1）内部形成多个导光散射部（2），其中所述导光散射部（2）按照一定规则排列。所述导光散射部（2）可减少导光板色差，避免坏点产生，还可提高光出射效率。

Description

导光板及其制造方法 技术领域
本发明是有关于一种导光板，特别是有关于一种可减少色差及提高光出射效率的导光板及其制造方法。
 背景技术
由于液晶显示器的液晶面板不具自主发光的功能，因此液晶显示器需要进一步具备背光模块以供应液晶面板充分且分布均匀的面光源。一般而言，背光模块主要可分成直下式与侧入式两种形态，其中导光板是侧入式的背光模块得以提供均匀面光源的关键元件。导光板是利用全反射的原理将从导光板侧边进入的光线传递至所述导光板的远端。
为了让光线能均匀地从导光板的出光面射出，一种导光板设计会于导光板的表面通过印刷的方式设置油墨网点。所述油墨网点是用于破坏入射光的全反射，而使入射光散射至出光面。另有一种导光板设计是于导光板的表面形成微结构，利用此微结构达到破坏入射光的全反射的效果。
然而，由于油墨网点会有掉油墨的缺陷，且因为油墨网点对蓝光的吸收较其他可见光波段更强，因此导致导光板出光面形成较大的色差，即产生背光色差不均现象。再者，如图1所示，图1是显示经过干燥过程而翘曲变形的导光板的侧视图。印刷有油墨网点的导光板9必须经过一道干燥过程，以烘干油墨网点。但在此干燥过程中，导光板9的结构容易因受热而变形。变形的导光板结构将会影响其光学功能。
所述微结构容易因刮伤而影响其光学功能。而对于大尺寸背光模组来说，以传统射出成型装置制造所述微结构导光板时，不可避免地会有产品品质与微结构的均匀度问题产生。
故，有必要提供一种导光板及其制造方法，以解决现有技术所存在的问题。
 技术问题
本发明提供一种导光板及其制造方法，以解决传统印刷有油墨网点或是具有微结构的导光板所存在的问题。
 技术解决方案
本发明的主要目的在于提供一种导光板，其包括：
导光板体，具有一第一侧及一第二侧，所述第一侧用以接受入射光，所述第二侧相对于所述第一侧；以及
多个导光散射部，成形于所述导光板体内部，并位于第一侧与第二侧之间。
在本发明的一实施例中，通过透镜将激光聚焦至所述导光板体内部，进而激光在所述导光板体内部烧蚀而形成所述导光散射部。
在本发明的一实施例中，所述导光散射部分成数个散射列，所述散射列与所述导光板体的第一侧与第二侧平行，其中位于同一散射列的导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的散射列的导光散射部尺寸越大。
在本发明的一实施例中，每一所述导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的单位面积内的导光散射部布密度越高。
在本发明的一实施例中，所述导光板体的材质是选自聚甲基丙烯酸甲酯或聚碳酸酯。
本发明另提供一种导光板制造方法，其包括下列步骤：
成型一导光板体；以及
于所述导光板体的内部成形多个导光散射部。
在本发明的一实施例中，通过透镜将激光聚焦至所述导光板体内部，进而激光在所述导光板体内部烧蚀而形成所述导光散射部。
在本发明的一实施例中，所述导光板体具有一第一侧及一第二侧，所述第一侧用以接受入射光，所述第二侧相对于所述第一侧；所述导光散射部分成数个散射列，所述散射列与所述导光板体的第一侧与第二侧平行，其中位于同一散射列的导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的散射列的导光散射部尺寸越大。
在本发明的一实施例中，所述导光板体具有一第一侧及一第二侧，所述第一侧用以接受入射光，所述第二侧相对于所述第一侧；每一所述导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的单位面积内的导光散射部布密度越高。
在本发明的一实施例中，所述导光板体的材质是选自聚甲基丙烯酸甲酯或聚碳酸酯。
 有益效果
本发明主要是先成型一导光板体，再于所述导光板体内部通过激光烧蚀形成多个导光散射部，其中所述导光散射部照一定规则排列。所述烧蚀形成的导光散射部可减少导光板色差，避免坏点产生，还可提高光出射效率。
 附图说明
图1是显示经过干燥过程而翘曲变形的导光板的侧视图。
图2是本发明导光板第一实施例的侧面剖视图。
图3是本发明导光板第一实施例的立体图。
图4是本发明导光板第二实施例的侧面剖视图。
图5是本发明导光板制造方法一较佳实施例的流程图。
 本发明的最佳实施方式
为让本发明上述目的、特征及优点更明显易懂，下文特举本发明较佳实施例，并配合附图，作详细说明如下。再者，本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
请参考图2及图3所示，图2为本发明导光板第一实施例的侧面剖视图，图3是本发明导光板第一实施例的立体图。本发明导光板主要包含一导光板体1及多个导光散射部2。本发明导光板优选是应用于侧入光式背光模组。
所述导光板体1优选是一射出成形的构件，且所述导光板体材质优选是选自聚甲基丙烯酸甲酯或聚碳酸酯，但不限于此。所述导光板体1具有一第一侧11及一第二侧12。所述第一侧11即为入光侧，其面对一发光源而用以接受入射光。所述第二侧12相对于所述第一侧11。
所述多个导光散射部2是成形于所述导光板体1内，并位于第一侧11与第二侧12之间。所述导光散射部2可将从第一侧11入射进入导光板体1的光线反射至所述导光板体1的一出光面。如图2所示，本实施例中，所述导光散射部2优选是激光3通过透镜30聚焦至所述导光板体1内烧蚀成形的，但所述导光散射部2不限于此种成形方法，例如，所述导光散射部2也可在成形导光板体1的过程中，通过引入气体气泡的方式设置于所述导光板体1内部。
再者，如图2所示，本实施例中，每一所述导光散射部2大小相同，且在所述第一侧11往第二侧12的方向上，越远离所述第一侧11的单位面积内的导光散射部2分布密度越高。如此，通过分布密度较高的导光散射部2反射光线，距离入射光源较远的区域所反射的光量可与距离入射光源较近的区域所反射的光量相接近，进而使出光面的光线平均分散。
又或者，如图4所示，为本发明导光板第二实施例的侧面剖视图。所述导光散射部2分成数个散射列20，所述散射列20与所述导光板体1的第一侧11与第二侧12平行，其中位于同一散射列20的导光散射部2大小相同，且在所述第一侧11往第二侧12的方向上，越远离所述第一侧11的散射列20的导光散射部2尺寸越大。如此，通过尺寸较大的导光散射部2反射光线，距离入射光源较远的区域所反射的光量可与距离入射光源较近的区域所反射的光量相接近，进而使出光面的光线平均分散。
有关本发明导光散射部2的排列并不局限于上述两种实施例。
有关前述导光板的制造方法请参考图5所示，主要包含下列步骤：
S100：成型一导光板体1；以及
S200：于所述导光板体1的内部成形多个导光散射部2，同上述说明，所述导光散射部2优选是激光3通过透镜30聚焦而烧蚀成形的，但不限于此种成形方法，例如，所述导光散射部2也可在成形导光板体1的过程中，通过引入气体气泡的方式设置于所述导光板体1内部。
由上述说明可知，相较于传统印刷有油墨网点的导光板具有容易掉油墨及显示色差较大的缺陷，以及表面设置微结构的导光板容易因刮伤而影响其光学功能，本发明的导光板通过激光等方法于导光板体的内部形成导光散射部，可避免刮伤，且因为无印刷油墨的关系而无光线吸收损耗所导致的色差问题产生。因此，本发明可避免坏点(dot mura)产生，并且提高光出射效率，提升能量利用效率。
本发明已由上述相关实施例加以描述，然而上述实施例仅为实施本发明的范例。必需指出的是，已公开的实施例并未限制本发明的范围。相反地，包含于权利要求书的精神及范围的修改及均等设置均包括于本发明的范围内。
 本发明的实施方式
工业实用性
序列表自由内容

Claims (11)

  1. 一种导光板，其特征在于：所述导光板包含：
    导光板体，具有一第一侧及一第二侧，所述第一侧用以接受入射光，所述第二侧相对于所述第一侧；以及
    多个导光散射部，成形于所述导光板体内部，并位于第一侧与第二侧之间；所述导光散射部是通过透镜将激光聚焦至所述导光板体内部，进而激光在所述导光板体内部烧蚀而形成，且所述导光散射部分成数个散射列，所述散射列与所述导光板体的第一侧与第二侧平行，其中位于同一散射列的导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的散射列的导光散射部尺寸越大。
  2. 一种导光板，其特征在于：所述导光板包含：
    导光板体，具有一第一侧及一第二侧，所述第一侧用以接受入射光，所述第二侧相对于所述第一侧；以及
    多个导光散射部，成形于所述导光板体内部，并位于第一侧与第二侧之间。
  3. 如权利要求2所述的导光板，其特征在于：通过透镜将激光聚焦至所述导光板体内部，进而激光在所述导光板体内部烧蚀而形成所述导光散射部。
  4. 如权利要求2所述的导光板，其特征在于：所述导光散射部分成数个散射列，所述散射列与所述导光板体的第一侧与第二侧平行，其中位于同一散射列的导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的散射列的导光散射部尺寸越大。
  5. 如权利要求3所述的导光板，其特征在于：每一所述导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的单位面积内的导光散射部布密度越高。
  6. 如权利要求2所述的导光板，其特征在于：所述导光板体的材质是选自聚甲基丙烯酸甲酯或聚碳酸酯。
  7. 一种导光板制造方法，其特征在于：所述导光板制造方法包含下列步骤：
    成型一导光板体；以及
    于所述导光板体的内部成形多个导光散射部。
  8. 如权利要求7所述的导光板制造方法，其特征在于：通过透镜将激光聚焦至所述导光板体内部，进而激光在所述导光板体内部烧蚀而形成所述导光散射部。
  9. 如权利要求7所述的导光板制造方法，其特征在于：
    所述导光板体具有一第一侧及一第二侧，所述第一侧用以接受入射光，所述第二侧相对于所述第一侧；以及
    所述导光散射部分成数个散射列，所述散射列与所述导光板体的第一侧与第二侧平行，其中位于同一散射列的导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的散射列的导光散射部尺寸越大。
  10. 如权利要求7所述的导光板制造方法，其特征在于：
    所述导光板体具有一第一侧及一第二侧，所述第一侧用以接受入射光，所述第二侧相对于所述第一侧；以及
    每一所述导光散射部大小相同，且在所述第一侧往第二侧的方向上，越远离所述第一侧的单位面积内的导光散射部布密度越高。
  11. 如权利要求7所述的导光板制造方法，其特征在于：所述导光板体的材质是选自聚甲基丙烯酸甲酯或聚碳酸酯。
PCT/CN2011/079135 2011-08-24 2011-08-30 导光板及其制造方法 WO2013026214A1 (zh)

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