WO2017028200A1 - 一种导光板及显示装置 - Google Patents

一种导光板及显示装置 Download PDF

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Publication number
WO2017028200A1
WO2017028200A1 PCT/CN2015/087347 CN2015087347W WO2017028200A1 WO 2017028200 A1 WO2017028200 A1 WO 2017028200A1 CN 2015087347 W CN2015087347 W CN 2015087347W WO 2017028200 A1 WO2017028200 A1 WO 2017028200A1
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Prior art keywords
light guide
guide plate
layer
reflective layer
display device
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PCT/CN2015/087347
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English (en)
French (fr)
Inventor
樊勇
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/779,213 priority Critical patent/US10571621B2/en
Publication of WO2017028200A1 publication Critical patent/WO2017028200A1/zh
Anticipated expiration legal-status Critical
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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
    • 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
    • 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
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0093—Means for protecting the light guide

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a light guide plate and a display device.
  • the main material of the light guide plate is the optical acrylic (PMMA) plate, whose chemical name is methyl methacrylate, and its specific gravity is 1190 kg per cubic meter.
  • the transparent acrylic sheet has high light transmittance, strong impact resistance and wide application. Acrylic sheets currently produced have different quality in different processes due to different manufacturers. Especially, although the recycled plates are cheap, they are easy to yellow and have poor transmittance. Moreover, the light guide plate of such materials has a low hardness, and the metal back plate is required to support the light guide plate from the bottom, which increases the component cost and overall thickness of the product and the light guide plate, and is disadvantageous for the thin design of the display device.
  • PMMA optical acrylic
  • the present invention provides a light guide plate and a display device that reduce the cost and overall thickness of components associated with a light guide plate.
  • a light guide plate includes a light guide plate body and a buffer layer and a reflective layer integrally formed on the lower surface of the light guide plate body in sequence, and the upper surface of the light guide plate body is provided with a plurality of scattering mesh points.
  • the light guide plate body is glass.
  • the buffer layer is one of alumina, nickel or chromium.
  • the reflective layer includes a first reflective layer that is in close contact with the lower surface of the buffer layer, and the first reflective layer is a metal layer.
  • the reflective layer further comprises a second reflective layer that is in close contact with the lower surface of the first reflective layer, and the second reflective layer comprises a plurality of dielectric layers composed of two different refractive index materials.
  • the dielectric layer of the second reflective layer is formed by alternately stacking SiO 2 layers and TiO 2 layers.
  • the dielectric layer of the second reflective layer is formed by alternately stacking MgF 2 layers and ZnS layers.
  • the light guide plate further comprises a protective layer that is in close contact with the lower surface of the reflective layer.
  • the protective layer is a SiO 2 material.
  • a display device of the present invention includes an optical film set, a display panel, and the above-described light guide plate.
  • the light guide plate of the invention is integrally formed by the main body of the light guide plate and the reflective layer, and the main body of the light guide plate is made of glass material, and the strength of the light guide plate is effectively improved, thereby eliminating the metal back plate structure matched with the display device, which is beneficial to the light guide plate.
  • the cost of the matched components is reduced and the product is thinned.
  • the reflective layer is composed of a metal layer having a reflective function and a dielectric layer plated at the bottom of the metal layer, so that the light guide plate has an extremely high reflectance.
  • FIG. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention.
  • FIG. 2 is a software simulation result diagram of reflectance of incident light of different wavelengths when the incident angle is 0° according to an embodiment of the present invention.
  • 3 is a software simulation result diagram of reflectance of incident light of different wavelengths when the incident angle is 30° of the light guide plate according to the embodiment of the present invention.
  • FIG. 4 is a software simulation result diagram of reflectance of incident light of different wavelengths at a light incident angle of the light guide plate according to an embodiment of the present invention.
  • a light guide plate of the present invention includes a light guide plate main body 11 and a buffer layer 12, a reflective layer 13 and a protective layer 14 integrally formed on the lower surface of the light guide plate main body 11 from top to bottom, and the upper surface of the light guide plate main body 11.
  • a plurality of scattering dots 100 are provided on the surface.
  • the light guide plate main body 11 is glass, and a plurality of scattering mesh points 100 are formed on the upper surface of the glass by laser dot striking, and the upper surface is a light emitting surface, and light emitted through the upper surface is scattered by the scattering mesh point 100 to emit light. Uniform and consistent.
  • the buffer layer 12 is one of aluminum oxide, nickel or chromium
  • the reflective layer 13 includes a first reflective layer 13a and a second reflective layer 13b which are sequentially adhered to the lower surface of the buffer layer 12, and the first reflective layer 13a is a metal layer.
  • the second reflective layer 13b is a dielectric layer.
  • the first reflective layer 13a is a silver reflective layer plated on the lower surface of the buffer layer 12.
  • the second reflective layer 13b includes a plurality of dielectric layers composed of two different refractive index materials, wherein the dielectric layer is formed by stacking materials having high and low refractive indices, and the number of layers of the dielectric layer may be due to the presence of the first reflective layer 13a. Relatively few, the number of layers is preferably from 3 to 20 layers, such as 3 layers, 8 layers, 16 layers and 20 layers.
  • the dielectric layer of the second reflective layer 13b is a combination of high/low refractive index reflective layers, such as a SiO 2 layer and a TiO 2 layer, or a combination of a MgF 2 layer and a ZnS layer.
  • high refractive index and the low refractive index material are alternately arranged in order from top to bottom to form a composite reflective structure, and the light transmitted from the first reflective layer 13a can be further reflected back through the second reflective layer 13b.
  • the overall brightness and optical utilization of the light guide plate 10 are greatly improved.
  • the protective layer 14 is a 1/2 wavelength SiO 2 material, which is plated on the bottom of the second reflective layer 13b and can be used to protect the reflective layer 13 from damage.
  • the light guide plate 10 of the embodiment of the invention can be applied to various ultra-thin size display devices.
  • the display device includes a light guide plate 10, an optical film set 20, a display panel 30, a middle frame 40, a front frame 50, and a light source.
  • the module 60 wherein the light source module 60 is an LED light source, is integrated with the heat dissipation plate and placed on the light-incident side of the light guide plate 10.
  • the middle frame 40 houses the light guide plate 10 and the light source module 60 therein, and the optical film group 20
  • the multi-layer composite optical film is attached to the upper surface of the middle frame 40 for scattering and deflecting light emitted from the light-emitting surface of the light guide plate 10 to form a predetermined light-emitting effect;
  • the front frame 50 is disposed outside the middle frame 40 The components in the middle frame 40 and the middle frame are protected; the display panel 30 is mounted on the upper surface of the front frame 50 by dispensing or pasting.
  • the upper surface of the middle frame 40 is provided with a step portion having the same height as the optical film group 20 near the inner side, and the end portion of the optical film group 20 is embedded and fitted in the step portion, and the inner surface of the front frame 50 is At the same time, it is in close contact with the upper surfaces of the optical film group 20 and the middle frame 40, so that the overall structure of the display device is more compact and thinner.
  • a light guide plate (sample A in the drawing) having three dielectric layers and a light guide plate (sample B in the figure) having a silver-plated bottom surface of the present embodiment are at different incident angles and different incident wavelengths.
  • Reflectance comparison chart wherein, the incident light source is an LED light source, and the incident surface is a glass surface at the top of the light guide plate.
  • the average reflectance of the sample A in the wavelength range of 435 nm to 680 nm is 99.28%, and the sample B is 97.76%, which is reflected from the silver plated light guide plate alone.
  • the rate increased by 1.52%.
  • sample A is at a wavelength of 435 nm to 680 nm.
  • the average reflectance of the light in the range is 99.23%, while the sample B is 96.11%, which is 3.12% higher than that of the single silver plated light guide.
  • the average reflectance of the sample A in the wavelength range of 435 nm to 680 nm is 98.85% under the same conditions, and the sample B is 97.29%, which is reflected from the silver plated light guide plate alone.
  • the rate increased by 1.56%.
  • the light guide plate of the embodiment of the present invention has better reflection effect than the ordinary light guide plate and the silver-plated reflective layer on the glass surface, and is advantageous for the display device to be ultra-thin, and the light guide plate light utilization rate and brightness can be obviously displayed. The display is even better.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种导光板及一种显示装置，包括导光板主体（11）和依次一体形成于所述导光板主体（11）下表面的缓冲层（12）和反射层（13），所述导光板主体（11）的上表面设有多个散射网点（100）。所述导光板由导光板主体（11）与反射层（13）一体形成，导光板主体（11）采用玻璃材料制成，导光板强度得以有效提升，省去了显示装置中与之配套的金属背板结构，有利于导光板配套的零部件成本降低以及产品的薄形化；同时，反射层（13）由金属层（13a）和金属层（13a）底部镀制的介质层（13b）组成，使得导光板具有极高的反射率。

Description

一种导光板及显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种导光板及显示装置。
背景技术
导光板主要材料为光学压克力(PMMA)板，其化学名称是甲基丙烯酸甲脂，它的比重是每立方米1190kg。透明压克力板材具有很高的透光率，扩冲击能力强，应用非常广泛。目前生产的压克力板材，因其不同厂家不同工艺，在质量上也有差异，特别是再生板虽然价钱便宜，但容易黄化透光度也差。且此类材料的导光板硬度较低，往往需要采用金属背板从底部对导光板进行支撑，增加了产品与导光板配套的零部件成本及整体厚度，且不利于显示装置的薄型化设计。
发明内容
鉴于现有技术存在的不足，本发明提供了一种降低与导光板配套的零部件成本及整体厚度的导光板及显示装置。
为了实现上述的目的，本发明采用了如下的技术方案：
一种导光板，包括导光板主体和依次一体形成于所述导光板主体下表面的缓冲层和反射层，所述导光板主体的上表面设有多个散射网点。
其中，所述导光板主体为玻璃。
其中，所述缓冲层为氧化铝、镍或铬中的一种。
其中，所述反射层包括紧贴于所述缓冲层下表面的第一反射层，所述第一反射层为金属层。
其中，所述反射层还包括紧贴于所述第一反射层下表面的第二反射层，所述第二反射层包括多层由两种不同折射率材料组成的介质层。
其中，所述第二反射层的所述介质层为SiO2层和TiO2层交替堆叠形成。
或者，所述第二反射层的所述介质层为MgF2层和ZnS层交替堆叠形成。
其中，所述导光板还包括紧贴于所述反射层下表面的保护层。
其中，所述保护层为SiO2材料。
本发明一种显示装置，包括光学膜片组、显示面板和上述的导光板。
本发明的导光板由导光板主体与反射层一体形成，导光板主体采用玻璃材料制成，导光板强度得以有效提升，省去了显示装置中与之配套的金属背板结构，有利于导光板配套的零部件成本降低以及产品的薄形化；同时，反射层由具有反射功能的金属层和金属层底部镀制的介质层组成，使得导光板具有极高的反射率。
附图说明
图1为本发明实施例的显示装置结构示意图。
图2为本发明实施例的导光板在入射角为0°时不同波长入射光的反射率的软件模拟结果图。
图3为本发明实施例的导光板在入射角为30°时不同波长入射光的反射率的软件模拟结果图。
图4为本发明实施例的导光板在入射角为70°时不同波长入射光的反射率的软件模拟结果图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
参阅图1，本发明的导光板包括导光板主体11和自上而下依次一体形成于该导光板主体11的下表面的缓冲层12、反射层13和保护层14，导光板主体11的上表面设有多个散射网点100。
其中，导光板主体11为玻璃，若干散射网点100通过激光打点的方式阵列形成在该玻璃的上表面，该上表面即为出光面，通过该上表面发出的光经过散射网点100散射后使得出光均匀，一致性好。
缓冲层12为氧化铝、镍或铬中的一种，反射层13包括依次紧贴于缓冲层 12下表面的第一反射层13a和第二反射层13b，第一反射层13a为金属层，第二反射层13b为介质层。优选第一反射层13a为镀制在缓冲层12下表面的银反射层，缓冲层12的存在使得第一反射层13a能更好地附着在导光板主体11上，避免脱落；第二反射层13b包括多层由两种不同折射率材料组成的介质层，其中，该介质层为具有高低两种折射率的材料堆叠而成，由于第一反射层13a的存在，该介质层的层数可以相对较少，层数在3～20层为宜，如3层、8层、16层和20层等。第二反射层13b的介质层为高/低折射率的反射层搭配组合而成，如SiO2层与TiO2层，或MgF2层与ZnS层的组合。通过这样的设置，高折射率与低折射率材料从上至下依次交替性地布置形成复合的反射结构，从第一反射层13a透过的光线可以进一步通过第二反射层13b反射回，可以大幅提升导光板10的整体亮度和光学利用率。
更进一步地，保护层14为1/2波长的SiO2材料，镀制于第二反射层13b底部，可用于保护反射层13免受损坏。
本发明实施例的导光板10可应用于各种超薄尺寸的显示装置中，具体地，显示装置包括导光板10、光学膜片组20、显示面板30、中框40、前框50和光源模块60，其中，光源模块60为LED光源，与散热板集成在一起放置在导光板10的入光侧一侧，中框40将导光板10与光源模块60容纳于其中，光学膜片组20为多层复合光学膜片，贴合于中框40上表面，用于对导光板10出光面发出的光线进行散射和偏转，以形成预定的出光效果；前框50罩设在中框40外，对中框40及中框内的零部件进行保护；显示面板30通过点胶或粘贴等方式安装在前框50上表面。更具体地，中框40上表面在靠近内侧设有一圈高度与光学膜片组20相同的台阶部，光学膜片组20的端部嵌入并贴合于该台阶部内，前框50的内表面同时紧贴在光学膜片组20和中框40的上表面，这样，显示装置的整体结构更加紧凑，尺寸更薄。
如图2～4，为本实施例的具有3层介质层的导光板(图中样本A)与玻璃底面镀银组成的导光板(图中样本B)在不同入射角与不同入射波长条件下的反射率对比图。其中，入射光源为LED光源，入射面为导光板顶部的玻璃表面。
如图2所示，入射角为0°时，同等条件下，样本A在435nm-680nm波长范围内光线的平均反射率达99.28％，而样本B为97.76％，较单独镀银的导光板反射率提升1.52％。
如图3所示，入射角为30°时，同等条件下，样本A在435nm-680nm波长 范围内光线的平均反射率达99.23％，而样本B为96.11％，较单独镀银的导光板反射率提升3.12％。
如图4所示，入射角为70°时，同等条件下，样本A在435nm-680nm波长范围内光线的平均反射率达98.85％，而样本B为97.29％，较单独镀银的导光板反射率提升1.56％。
因此，本发明实施例的导光板具有比普通导光板和在玻璃表面镀银反射层更好的反射效果，有利于显示装置超薄化的同时，可以明显导光板光线利用率和亮度，显示装置的显示效果更加出色。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (19)

  1. 一种导光板，其中，包括导光板主体和依次一体形成于所述导光板主体下表面的缓冲层和反射层，所述导光板主体的上表面设有多个散射网点。
  2. 根据权利要求1所述的导光板，其中，所述导光板主体为玻璃。
  3. 根据权利要求1所述的导光板，其中，所述缓冲层为氧化铝、镍或铬中的一种。
  4. 根据权利要求1所述的导光板，其中，所述反射层包括紧贴于所述缓冲层下表面的第一反射层，所述第一反射层为金属层。
  5. 根据权利要求4所述的导光板，其中，所述反射层还包括紧贴于所述第一反射层下表面的第二反射层，所述第二反射层包括多层由两种不同折射率的材料层组成的介质层。
  6. 根据权利要求5所述的导光板，其中，所述第二反射层的所述介质层为SiO2层和TiO2层交替堆叠形成。
  7. 根据权利要求5所述的导光板，其中，所述第二反射层的所述介质层为MgF2层和ZnS层交替堆叠形成。
  8. 根据权利要求4所述的导光板，其中，还包括紧贴于所述反射层下表面的保护层。
  9. 根据权利要求8所述的导光板，其中，所述保护层为SiO2材料。
  10. 一种显示装置，其中，包括光学膜片组、显示面板和导光板，所述导光板包括导光板主体和依次一体形成于所述导光板主体下表面的缓冲层和反射层，所述导光板主体的上表面设有多个散射网点。
  11. 根据权利要求10所述的显示装置，其中，所述导光板主体为玻璃。
  12. 根据权利要求10所述的显示装置，其中，所述缓冲层为氧化铝、镍或铬中的一种。
  13. 根据权利要求10所述的显示装置，其中，所述反射层包括紧贴于所述缓冲层下表面的第一反射层，所述第一反射层为金属层。
  14. 根据权利要求13所述的显示装置，其中，所述反射层还包括紧贴于所 述第一反射层下表面的第二反射层，所述第二反射层包括多层由两种不同折射率的材料层组成的介质层。
  15. 根据权利要求14所述的显示装置，其中，所述第二反射层的所述介质层为SiO2层和TiO2层交替堆叠形成。
  16. 根据权利要求14所述的显示装置，其中，所述第二反射层的所述介质层为MgF2层和ZnS层交替堆叠形成。
  17. 根据权利要求13所述的显示装置，其中，所述导光板还包括紧贴于所述反射层下表面的保护层。
  18. 根据权利要求17所述的显示装置，其中，所述保护层为SiO2材料。
  19. 一种显示装置，其中，包括光学膜片组、显示面板和导光板，所述导光板包括导光板主体和依次一体形成于所述导光板主体下表面的缓冲层和反射层，所述导光板主体的上表面设有多个散射网点；所述反射层包括紧贴于所述缓冲层下表面的第一反射层，所述第一反射层为金属层。
PCT/CN2015/087347 2015-08-14 2015-08-18 一种导光板及显示装置 Ceased WO2017028200A1 (zh)

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