WO2013120279A1 - 一种导光板、背光模组及液晶显示装置 - Google Patents

一种导光板、背光模组及液晶显示装置 Download PDF

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Publication number
WO2013120279A1
WO2013120279A1 PCT/CN2012/071653 CN2012071653W WO2013120279A1 WO 2013120279 A1 WO2013120279 A1 WO 2013120279A1 CN 2012071653 W CN2012071653 W CN 2012071653W WO 2013120279 A1 WO2013120279 A1 WO 2013120279A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
phosphor
backlight module
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Application number
PCT/CN2012/071653
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English (en)
French (fr)
Inventor
王烨文
Original Assignee
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 US13/503,951 priority Critical patent/US20130215361A1/en
Publication of WO2013120279A1 publication Critical patent/WO2013120279A1/zh

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Classifications

    • 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
    • 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
    • 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
    • G02F1/133621—Illuminating devices providing coloured light

Definitions

  • Light guide plate, backlight module and liquid crystal display device are Light guide plate, backlight module and liquid crystal display device
  • the present invention relates to the field of liquid crystal display, and more particularly to a light guide plate, a backlight module, and a liquid helium display device.
  • a backlight module is required to provide a light source, which is distinguished by light entering mode.
  • the group is divided into a direct type and a side light type.
  • the light source of the edge-lit backlight module includes a light guide plate and a light bar disposed on a side of the light guide plate, and a plurality of WLEDs (white light-emitting diodes) are disposed on the light bar, and a CCFL (cold cathode tube) is also used as a backlight module.
  • WLED white light-emitting diodes
  • CCFL cold cathode tube
  • the heat generated by the LED chip is likely to cause the phosphor to be thermally degraded, thereby affecting the light-emitting efficiency and affecting the light intensity of the backlight module.
  • the technical problem to be solved by the present invention is to provide a light guide plate, a backlight module, and a liquid crystal display device which improve the display effect of the liquid crystal display device.
  • the light-incident surface of the light guide plate has a plurality of side-by-side convex structures.
  • the convex structure reduces the refractive concentration of the incident light in the light guide plate, thereby improving the light-wattering of the light guide plate, and making the light path of the chip reach the same level of the phosphor layer, thereby reducing the occurrence of color shift.
  • the light interference between the LEDs is avoided, and the light mixing between the LEDs is made uniform.
  • the light-incident surface of the light guide plate has a plurality of side-by-side concave structures. Cylindrical structure The refracting concentration of the ray in the light guide plate is reduced, thereby increasing the light smearing of the light guide plate, and causing the light path of the chip to reach the phosphor layer to have the same optical path, thereby reducing the occurrence of color shift, and additionally Light interference between the LEDs is avoided, and the light mixing between the LEDs is made uniform.
  • the light guide plate further includes a light guide plate body and a carrier film disposed on the light incident surface of the light guide plate body, and the phosphor is coated on the carrier film.
  • the phosphor is coated on the carrier film, and the carrier film is attached to the light guide plate, which is convenient for processing and improves production efficiency.
  • one side of the carrier film has a plurality of side-by-side cylindrical structures, and the phosphor is coated on the surface having a plurality of side-by-side convex structures.
  • Forming a convex structure on the carrier film is more convenient to process than forming a cylindrical structure on the light guide plate.
  • one side of the carrier film has a plurality of side-by-side surface structures, and the phosphor is coated on the surface having a plurality of side-by-side concave structures.
  • Forming a concave structure on the carrier film is more convenient to process than forming a concave structure on the light guide plate.
  • a backlight module includes a primary color light source and the above light guide plate.
  • the primary color light source is a blue light emitting diode.
  • Blue LEDs are light-emitting diodes that are superior and easy to manufacture.
  • a liquid crystal display device includes the above backlight module.
  • the primary color light emitting diode is a blue light emitting diode.
  • Blue LEDs are light-emitting diodes that are superior and easy to manufacture.
  • the invention applies a layer of phosphor on the light incident surface of the light guide plate, so that in the package of the primary color light source such as the light emitting diode, it is no longer necessary to add a phosphor coating process to manufacture white light, and the non-white light of the primary color light source enters.
  • the color requirement of the light is ensured, and the phosphor is kept away from the chip of the light emitting diode, thereby avoiding the light decay caused by the heat generated by the light source such as the light emitting diode chip. Therefore, the luminous efficiency of the light source is prevented from being reduced by the influence of the phosphor change, thereby improving the light intensity of the backlight module and the display effect of the liquid crystal display device.
  • FIG. 1 is a structural view of a light guide plate and a light bar in a backlight module according to Embodiment 1 of the present invention
  • FIG. 2 is an enlarged view of A in Figure 1
  • FIG. 3 is a structural view of a light guide plate and a light bar in a backlight module according to Embodiment 2 of the present invention.
  • Figure 4 is an enlarged view of B in Figure 3.
  • FIG. 5 is a structural view of a light guide plate and a light bar in a backlight module according to Embodiment 3 of the present invention.
  • FIG. 6 is a structural view of a light guide plate and a light bar in a backlight module according to Embodiment 4 of the present invention.
  • the backlight module includes: a light guide plate 20 and an LED 10 , wherein the LED 10 is a primary color light emitting diode that is not coated with phosphor in the package.
  • the light source of the module uses a blue light emitting diode. Of course, other light sources such as a cold cathode tube can also be used.
  • the light emitted by the blue light emitting diode is non-white light but blue light, and the light guide plate 20 A phosphor 22 is disposed on the body surface to convert the blue light emitted by the LED 10 into white light, and then enters the inside of the light guide plate.
  • the phosphor is far away from the chip of the light-emitting diode, thereby avoiding the light decay caused by the heat generated by the chip of the light-emitting diode, thereby preventing the light-emitting efficiency of the LED from being reduced by the influence of the phosphor change, thereby improving the backlight.
  • the light intensity of the module and the display effect of the liquid crystal display device are very small.
  • the phosphor 22 is first coated on the carrier film 21, and then the carrier film 21 is attached to the light incident surface of the light guide plate 20.
  • the surface of the carrier film 21 opposite to the LED 10 ie, coated with the phosphor 22
  • the light incident surface of the light guide plate body should also be a flat surface.
  • the convex structure on the carrier film 21 reduces the concentration ratio of incident light rays in the light guide plate 20, thereby improving the light uniformity of the light guide plate, and causing the light emitted by the LED 10 to reach the optical path of the phosphor layer.
  • the same thereby reducing the degree of occurrence of color shift, in addition, due to the existence of the cylindrical structure, the incident angle of the light is changed, thereby avoiding the hotspot generated by the light interference between the LEDs, so as to The mixed light is uniform.
  • FIG. 3 and FIG. 4 show a second embodiment of the present invention.
  • one side of the carrier film 21 coated with the phosphor 22 has a plurality of side-by-side concave structures, and the concave structure also makes incident light.
  • the refractive concentration ratio in the light guide plate 20 is reduced, thereby improving the light uniformity of the light guide plate, and making the light path of the LED 10 reach the same optical path of the phosphor layer, thereby reducing the occurrence of color shift, and
  • the existence of the surface structure changes the incident angle of the light, thereby avoiding the hotspot generated by the light interference between the LEDs, and making the mixed light between the LEDs uniform.
  • the package of the LED on the light bar does not need to be coated with the phosphor, thereby encapsulating the packaging process of the LED.
  • the third embodiment and the fourth embodiment of the present invention may directly apply the phosphor 22 directly on the light incident surface of the light guide plate 20. Without coating on the carrier film.
  • the convex structure and the concave structure may be directly formed on the light-incident surface of the light guide plate 20, but the convexity is set on the carrier film due to the material characteristics of the light guide plate and the thinness of the light guide plate. And the concave structure is more convenient for the processing process. Use high lumen LEDs without uneven lighting.
  • the convex and concave structures described in the two embodiments of the present invention may have various forms, such as the convex structure in the embodiment, and may be a plurality of side-by-side convex cylinders on the light guide plate body.
  • the concave structure may be a plurality of equal-diameter holes arranged side by side on the light guide plate body, or may be a plurality of side-by-side light guide plates. The spherical surface on the board.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种导光板（20）、背光模组及液晶显示装置，所述导光板（20）的入光面上涂覆有一层荧光粉（22）。由于将在导光板（20）的入光面上涂覆了一层荧光粉（22），从而在原色光源如发光二极管（10）的封装中不再需要添加荧光粉（22）涂覆工艺制造白光，而原色光源的非白色光线进入导光板（20）内部前先经过荧光粉层（22）转变成白光，保证了光的颜色需求，同时使得荧光粉（22）远离了发光二极管（10）的芯片，避免了由于光源发热如发光二极管（10）的芯片发热使荧光粉（22）受热而发生光衰，也就避免了光源的发光效率受到荧光粉（22）变化的影响而降低，进而提高了背光模组的光强度和液晶显示装置的显示效果。

Description

一种导光板、 背光模组及液晶显示装置
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种导光板、 背光模组及液 曰曰显示装置。
【背景技术】
近年来由于液晶显示器具有体积小， 轻薄， 低耗能的优点得到了很大的发 展， 由于 LCD设备是被动式电子显示设备， 需要一个背光模组来提供光源， 以 入光方式进行区分， 背光模组又分为直下式和侧光式。 侧光式背光模组的光源 包括导光板和设置与该导光板侧面的灯条， 灯条上设置有多颗 WLED (白色发 光二极管）， 此外，也有使用 CCFL (冷阴极管）作为背光模组的光源， 而 WLED 相对更加环保， 效率更高， 目前， 主要使用 WLED作光源。
但是， 背光源的 WLED在使用过程中， 因发光二极管芯片 （LED Chip ) 产生的热量容易使荧光粉受热发生光衰， 进而影响使发光效率降低严重， 影响 背光模组的光强。
【发明内容】
本发明所要解决的技术问题是提供一种提高液晶显示装置的显示效果的导 光板及背光模组以及液晶显示装置。
本发明的目的是通过以下技术方案来实现的： 一种导光板， 所述导光板的 入光面上涂覆有一层荧光粉。
优选的， 所述导光板的入光面上具有多个并排的凸面结构。 凸面结构使入 射光线在导光板内的折射集中率减小， 从而提高导光板的光线均勾度， 并且使 芯片所发出的光线到达荧光粉层的光程相同， 进而减小色偏的发生程度， 另外 还避免了 LED之间的光线干涉， 使 LED之间的混光变的均匀。
优选的， 所述导光板的入光面上具有多个并排的凹面结构。 柱面结构使入 射光线在导光板内的折射集中率减小， 从而提高导光板的光线均勾度， 并且使 芯片所发出的光线到达荧光粉层的光程相同， 进而减小色偏的发生程度， 另外 还避免了 LED之间的光线干涉， 使 LED之间的混光变的均匀。
优选的， 所述导光板还包括导光板板体及设置在导光板板体入光面上的承 载膜， 所述荧光粉涂覆在所述承载膜上。 荧光粉涂覆在承载膜上， 再将承载膜 贴附在导光板上， 这样的便于加工， 提高生产效率。
优选的， 所述承载膜的一面具有多个并排的柱面结构， 所述荧光粉涂覆在 所述具有多个并排的凸面结构的面上。 在承载膜上形成凸面结构， 相对于在导 光板上形成柱面结构要更方便加工。
优选的， 所述承载膜的一面具有多个并排的 面结构， 所述荧光粉涂覆在 所述具有多个并排的凹面结构的面上。 在承载膜上形成凹面结构， 相对于在导 光板上形成凹面结构要更方便加工。
一种背光模组， 包括原色光源及上述的导光板。
优选的， 所述原色光源为蓝色发光二极管。 蓝色发光二极管为较优、 容易 制作成本低的发光二极管。
一种液晶显示装置， 包括上述的背光模组。
优选的， 所述原色发光二极管为蓝色发光二极管。 蓝色发光二极管为较优、 容易制作成本低的发光二极管。
本发明由于将在导光板的入光面上涂覆了一层荧光粉， 从而在原色光源如 发光二极管的封装中不再需要添加荧光粉涂覆工艺制造白光， 而原色光源的非 白色光线进入导光板内部前先经过荧光粉层转变成白光， 保证了光的颜色需求， 同时使得荧光粉远离了发光二极管的芯片， 避免了由于光源发热如发光二极管 的芯片发热使荧光粉受热而发生光衰， 也就避免了光源的发光效率受到荧光粉 变化的影响而降低， 进而提高了背光模组的光强度和液晶显示装置的显示效果。
【附图说明】 图 1是本发明实施例一的背光模组中导光板与灯条的结构筒图，
图 2是图 1中 A的放大图，
图 3是本发明实施例二的背光模组中导光板与灯条的结构筒图，
图 4是图 3中 B的放大图。
图 5是本发明实施例三的背光模组中导光板与灯条的结构筒图，
图 6是本发明实施例四的背光模组中导光板与灯条的结构筒图。
其中： 10、 LED, 20、 导光板， 21、 承载膜， 22、 荧光粉。
【具体实施方式】
下面结合附图和较佳的实施例对本发明作进一步说明。
实施例一
如图 1及图 2所示为本发明的实施例一，背光模组包括：导光板 20以及 LED 10等组件， 其中 LED10为封装中未涂覆荧光粉的原色发光二极管， 本实施例中 背光模组的光源使用蓝色发光二极管， 当然， 也可以使用其它光源如冷阴极管 等， 所述的蓝色发光二极管所发出的光线为非白色光线而是蓝色光线， 在导光 板 20的板体入光面上设置有一层荧光粉 22, 用于将 LED10所发出的蓝色光线 变成白色光线， 进而进入导光板内部。 这样， 荧光粉就远离了发光二极管的芯 片， 避免了由于发光二极管的芯片发热使荧光粉受热而发生光衰， 也就避免了 LED 的发光效率受到荧光粉变化的影响而降低， 进而提高了背光模组的光强度 和液晶显示装置的显示效果。
在本实施例一中， 荧光粉 22先涂覆承载膜 21上， 然后再将承载膜 21贴附 到导光板 20的入光面上。承载膜 21与 LED10相对的一面（即涂覆有荧光粉 22 ) 的表面上具有多个并排的凸面结构， 而另一面为平坦的表面， 该平坦表面贴合 在导光板板体的入光面上， 相应的， 导光板板体的的入光面也应当为平坦的表 面。 承载膜 21上的凸面结构使入射光线在导光板 20内的折射集中率减小， 从 而提高导光板的光线均匀度， 并且使 LED10所发出的光线到达荧光粉层的光程 相同， 进而减小色偏的发生程度， 另外， 由于柱面结构的存在， 使得光线的入 射角发生改变， 从而避免了 LED之间的光线干涉所产生的亮点 （hotspot ), 使 LED之间的混光变的均匀。
实施例二
如图 3及图 4所示为本发明的实施例二， 与实施例一不同的是， 承载膜 21 涂覆有荧光粉 22的一面为具有多个并排的凹面结构， 凹面结构同样使入射光线 在导光板 20内的折射集中率减小，从而提高导光板的光线均匀度，并且使 LED10 所发出的光线到达荧光粉层的光程相同， 进而减小色偏的发生程度， 另外， 由 于柱面结构的存在， 使得光线的入射角发生改变， 从而避免了 LED之间的光线 干涉所产生的亮点 （ hotspot ) , 使 LED之间的混光变的均匀。
在本发明中， 由于荧光粉设置在导光板上， 所以灯条上的 LED的封装不需 要再涂覆荧光粉， 因而筒化了 LED的封装工艺。
在本发明中， 如图 5及图 6所示分别为本发明的实施例三及实施例四， 由 图中所示， 也可以直接在导光板 20的入光面上直接涂覆荧光粉 22, 而不需要在 承载膜上涂覆。 同样的， 所述的凸面结构以及凹面结构也可以直接在导光板 20 的板体入光面上加工形成， 但是由于导光板的材质特性以及其尺寸较薄不易加 工， 而通过在承载膜设置凸面及凹面结构更则方便加工的过程。 使用高流明 LED, 而不会产生光线不均匀的状况。
当然， 本发明中两个实施例中所述的凸面及凹面结构可以有多种形式， 如 实施例以中的凸面结构， 可以是多个并排的在导光板板体上的凸出的柱面， 也 可以多个并排在导光板板体上的凸球面； 而实施例二中， 凹面结构可以是多个 并排在导光板板体上的等直径孔面， 也可以是多个并排在导光板板体上的 球 面。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通 技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替 换， 都应当视为属于本发明的保护范围。

Claims

权利要求
1、 一种导光板， 所述导光板的入光面上涂覆有一层荧光粉。
2、 如权利要求 1所述的一种导光板， 其特征在于， 所述导光板的入光面上 具有多个并排的凸面结构。
3、 如权利要求 1所述的一种导光板， 其特征在于， 所述导光板的入光面上 具有多个并排的凹面结构。
4、 如权利要求 1所述的一种导光板， 其特征在于， 所述导光板还包括导光 板板体及设置在导光板板体入光面上的承载膜， 所述荧光粉涂覆在所述承载膜 上。
5、 如权利要求 4所述的一种导光板， 其特征在于， 所述承载膜的一面具有 多个并排的凸面结构， 所述荧光粉涂覆在所述具有多个并排的柱面结构的面上。
6、 如权利要求 4所述的一种导光板， 其特征在于， 所述承载膜的一面具有 多个并排的凹面结构， 所述荧光粉涂覆在所述具有多个并排的凹面结构的面上。
7、 一种背光模组， 包括原色光源及导光板， 所述导光板的入光面上涂覆有 一层荧光粉。
8、 如权利要求 7所述的一种背光模组， 其特征在于， 所述导光板的入光面 上具有多个并排的凸面结构。
9、 如权利要求 7所述的一种背光模组， 其特征在于， 所述导光板的入光面 上具有多个并排的凹面结构。
10、 如权利要求 7所述的一种背光模组， 其特征在于， 所述导光板还包括 导光板板体及设置在导光板板体入光面上的承载膜， 所述荧光粉涂覆在所述承 载膜上。
11、 如权利要求 10所述的一种背光模组， 其特征在于， 所述承载膜的一面 具有多个并排的凸面结构， 所述荧光粉涂覆在所述具有多个并排的柱面结构的 面上。
12、 如权利要求 10所述的一种背光模组， 其特征在于， 所述承载膜的一面 具有多个并排的 W面结构， 所述荧光粉涂覆在所述具有多个并排的 面结构的 面上。
13、 如权利要求 7所述的一种背光模组， 其特征在于， 所述原色光源为蓝 色发光二极管。
14、 一种液晶显示装置， 包括背光模组， 所述背光模组包括导光板， 所述 导光板的入光面上涂覆有一层荧光粉。
15、 如权利要求 14所述的一种液晶显示装置， 其特征在于， 所述导光板的 入光面上具有多个并排的凸面结构。
16、 如权利要求 14所述的一种液晶显示装置， 其特征在于， 所述导光板的 入光面上具有多个并排的凹面结构。
17、 如权利要求 14所述的一种液晶显示装置， 其特征在于， 所述导光板还 包括导光板板体及设置在导光板板体入光面上的承载膜， 所述荧光粉涂覆在所 述承载膜上。
18、 如权利要求 17所述的一种液晶显示装置， 其特征在于， 所述承载膜的 一面具有多个并排的凸面结构， 所述荧光粉涂覆在所述具有多个并排的柱面结 构的面上。
19、 如权利要求 17所述的一种液晶显示装置， 其特征在于， 所述承载膜的 一面具有多个并排的 面结构， 所述荧光粉涂覆在所述具有多个并排的 面结 构的面上。
PCT/CN2012/071653 2012-02-16 2012-02-27 一种导光板、背光模组及液晶显示装置 WO2013120279A1 (zh)

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