WO2022233207A1 - 面光源装置和平板显示装置 - Google Patents

面光源装置和平板显示装置 Download PDF

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WO2022233207A1
WO2022233207A1 PCT/CN2022/084746 CN2022084746W WO2022233207A1 WO 2022233207 A1 WO2022233207 A1 WO 2022233207A1 CN 2022084746 W CN2022084746 W CN 2022084746W WO 2022233207 A1 WO2022233207 A1 WO 2022233207A1
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Prior art keywords
layer
refractive index
guide body
light guide
structural
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PCT/CN2022/084746
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English (en)
French (fr)
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陈怡敏
武鹏
李同
周淑金
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苏州晶智科技有限公司
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Priority to JP2023555144A priority Critical patent/JP2024511733A/ja
Publication of WO2022233207A1 publication Critical patent/WO2022233207A1/zh

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    • 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
    • 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
    • G02B6/005—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
    • 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
    • G02B6/0065—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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • the invention belongs to the technical field of liquid crystal display, and in particular relates to a surface light source device and a flat panel display device, in particular to a liquid crystal reflection type or transmission type display device.
  • the structure of the light guide film in the Chinese patent application CN109031512A is a trapezoidal structure.
  • the light guide film and the light guide plate are bonded together with an adhesive layer, which is equivalent to an inverted trapezoid structure on the surface of the light guide plate, and the light enters the side of the inverted trapezoid structure and diverges. After total reflection, light emerges from the bottom surface of the trapezoid.
  • the multi-layer interface causes the system reflectivity to be high, resulting in too low contrast of the screen.
  • the purpose of the present invention is to provide a surface light source device and a liquid crystal display device to solve the problem of low contrast of the front light source in the prior art.
  • a surface light source device includes:
  • a light guide body including an incident surface, a front exit surface and a rear exit surface respectively extending from opposite sides of the incident surface;
  • a luminous body arranged along the incident surface side of the light guide body
  • the structural layer that is arranged on the back exit surface side this structural layer is used to change the direction of the light that the light guide body emits to the structural layer, and is emitted in a direction away from the back exit surface;
  • the refractive index of the material of the structural layer is greater than the refractive index of the material of the second medium layer.
  • the refractive index of the material of the structural layer is 1.65
  • the refractive index of the material of the second medium layer is 1.33.
  • the surface light source device further comprises a first dielectric layer formed between the rear exit surface and the structural layer, and the refractive index of the material of the light guide body is greater than or equal to the material of the first dielectric layer the index of refraction.
  • the refractive index of the material of the light guide body is 1.58, and the refractive index of the material of the first medium layer is 1.48.
  • the cross section of each second dielectric layer perpendicular to the plane direction of the structural layer is a trapezoid, and the side of the trapezoid close to the light guide body is a long side, so A side of the trapezoid away from the light guide body is a short side.
  • the light guide body includes a reflecting surface opposite to the incident surface, the angle between the reflecting surface and the rear exit surface is an acute angle, and the light guide body also includes Reflector provided on the side of the reflective surface.
  • a plurality of superimposed structural layers are arranged on the rear exit surface side, and the structural layers are used to change the direction of the light emitted by the light guide body to the structural layer, and to move away from the light guide body.
  • the direction of the rear exit surface is emitted; each structural layer is respectively covered with a second medium layer, and the refractive index of the material of the structural layer is greater than the refractive index of the material of the second medium layer.
  • each of the second dielectric layers has a rectangular cross section perpendicular to the plane direction where the structural layer is located.
  • a first medium layer is provided between adjacent structural layers and between the structural layer and the light guide body, and the refractive index of the material of the light guide body is greater than that of the first medium The refractive index of the layer material.
  • a flat panel display device includes:
  • a flat panel display panel arranged on the rear exit surface side.
  • the present invention wraps the second medium layer in a structural layer with a certain refractive index, and proposes a structural scheme with matching refractive indices, which can Significantly increases contrast, improving the visual effect of existing front light sources.
  • FIG. 1 is a schematic structural diagram of a surface light source device in a first embodiment of the present application
  • FIG. 2 is a schematic diagram of the optical path of the vertically incident light in the first embodiment of the present application
  • FIG. 3 is a schematic diagram of the optical path of the incident light on the incident surface in the first embodiment of the present application.
  • FIG. 4 is a schematic diagram of the structure and optical path of the surface light source device in the second embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a flat panel display device according to an embodiment of the present application.
  • an embodiment of the present application provides a surface light source device 10 , which includes a light guide body 11 and a light-emitting body 12 that transmits light to the light guide body 11 . It also includes a first dielectric layer 13 , a structural layer 14 and a second dielectric layer 15 that are sequentially arranged on the exit surface of the light guide 11 , and the second dielectric layer is wrapped in the structural layer 14 .
  • the structure layer is used to change the direction of the light emitted by the light guide body to the structure layer, and emit light in a direction away from the rear exit surface.
  • the light guide body 11 mainly transmits light and emits light, preferably a flat plate structure, including an incident surface 111 , a front exit surface 112 and a rear exit surface 113 respectively extending from opposite sides of the incident surface 111 , and a reflection opposite to the incident surface 111 .
  • the front emitting surface 112 and the rear emitting surface 113 are arranged in parallel, and the included angle between the reflective surface 114 and the rear emitting surface 113 is an acute angle.
  • a reflection sheet 16 is provided on the side of the reflection surface 114 , and the reflection sheet 16 is a diaphragm having a certain reflectivity.
  • the light guide body 11 is preferably a material with low internal light absorption, such as an acrylic sheet and preferably includes acrylate, PMMA (polymethyl methacrylate), PC (polycarbonate), polyethylene, optical glass, and the like.
  • the shape of the light guide body 11 may be any suitable shape, and is not limited to a plate shape.
  • the light guide body 11 may also adopt a structure such as a wedge-shaped plate, which is not limited in this case.
  • the light-emitting body 12 is provided along the incident surface 111 side of the light guide body 11 .
  • the light-emitting body 12 is a line light source, for example, a light bar formed by arranging a plurality of LED lights.
  • the light emitted by the light-emitting body 12 enters the light-guiding body 11 through the incident surface 111 of the light-guiding body 11 .
  • the first dielectric layer 13 is made of an optical material, and the refractive index n2 of the light guide body 11 is greater than the refractive index n3 of the first dielectric layer 13 , satisfying 1 ⁇ n3 ⁇ n2.
  • the first dielectric layer 13 is bonded to the rear exit surface 113 of the light guide body 11 by gluing.
  • the structure layer 14 is made of optical material. In a preferred embodiment, the structure layer 14 is bonded to the surface of the first dielectric layer 13 by gluing.
  • the interior of the structural layer 14 is provided with a plurality of cavities along its plane direction, and each cavity is filled with a second dielectric layer 15 respectively.
  • the second dielectric layer 15 may be a liquid or colloid with optical properties such as water, silica gel, UV glue, etc., but is not limited thereto.
  • the refractive index n4 of the structural layer 14 is greater than the refractive index n5 of the second dielectric layer 15, and satisfies 1 ⁇ n5 ⁇ n4.
  • a plurality of strip-shaped channels may be formed in the structure layer 14 along the plane direction of the structure layer 14 first, and then a liquid or colloid having a certain refractive index is filled in the channels. Finally, the structure layer 14 is integrally glued on the surface of the first dielectric layer 13 .
  • the cross section of the second dielectric layer 15 perpendicular to the plane direction of the structure 14 is a trapezoid
  • the side of the trapezoid close to the light guide body 11 is the long side 151
  • the trapezoid is far from the guide
  • One side of the light body 11 is the short side 152 .
  • the cross section of the second dielectric layer is an isosceles trapezoid.
  • the refractive index n2 of the light guide body 11 is 1.58, the refractive index n3 of the first dielectric layer 13 is 1.48, the refractive index n4 of the structural layer 14 is 1.65, and the second dielectric layer 15
  • the refractive index n5 is 1.33.
  • the interface reflection can be ignored, that is, the reflected light mainly comes from the gap between the structural layers. If the second dielectric layer 15 is air, the refractive index is 1, and the reflectivity is 6% when incident on the surfaces 151 and 152. If the refractive index of the second dielectric layer 15 is 1.33, the reflectivity is as low as 1.2%. The brightness caused by the interface reflection is greatly reduced.
  • an optical path trace of the light passing through the light guide body 11 , the first dielectric layer 13 , the structural layer 14 , and the second dielectric layer 15 in sequence is provided.
  • the inclination angle ⁇ of the second dielectric layer 15 is 56°, and the cross section is an isosceles trapezoid structure.
  • the light is incident on the incident surface 111 of the light guide body 11, and when the light travels in the light guide body 11, it follows Snell's law of refraction:
  • N1sin ⁇ 1 N2sin ⁇ 2
  • N1 is the refractive index of medium 1
  • ⁇ 1 is the incident angle
  • N2 is the refractive index of medium 2
  • ⁇ 2 is the refraction angle
  • light 03 is an edge 40° light
  • the angle of incidence to the rear exit surface 113 is 50°, which can be emitted, and is incident on the structural layer 14 through the first dielectric layer 13, and the angle of incidence on the long side 151 is 47°.
  • the second dielectric layer 15 fills the cavity of the structural layer 14, the second dielectric layer 15 is located between the long side 151 and the short side 152, and the refractive index is 1.33.
  • the light rays incident from the structural layer 14 with a refractive index of 1.65 to the second dielectric layer 15 with a refractive index of 1.33 have total reflection, and the total reflection angle is 54°, so the light 03 can exit.
  • the angle of light incident on the side surface 153 of the second dielectric layer 15 is 60°, which is greater than the total reflection angle, total reflection occurs, and exits from the surface of the structural layer 14 at a small angle to achieve a certain collimation effect.
  • the light ray 04 which is incident on the rear exit surface 113 at an angle of 69°, just exits, and is incident on the side surface 153 of the second dielectric layer 15 at an angle of 61°, and full emission occurs.
  • the light 05 is incident on the long side 151, undergoes total reflection, returns to the light guide body 11, and is reflected back and forth to the tail end which is inclined to have a reflective effect.
  • Other small-angle light rays can be adjusted by tilting the tail end with reflective effect and then circulated out.
  • a plurality of superimposed structural layers 14 are provided on the rear exit surface 113 , and each structural layer 14 is respectively coated with a second medium layer 15, the second dielectric layer 15 is used to change the direction of the light emitted by the light guide body 11 to the second dielectric layer 15, and emit light in a direction away from the rear exit surface.
  • the structural layer 14 The index of refraction is greater than the index of refraction of the second dielectric layer 15 .
  • each of the second dielectric layers 15 has a rectangular cross-section perpendicular to the plane of the structural layer.
  • a first dielectric layer 13 is disposed between adjacent structural layers 14 and between the structural layers 14 and the light guide body 11 , and the refractive index of the light guide body 11 is greater than the refractive index of the first dielectric layer 13 .
  • the structural layer 14 is an optical material with a high refractive index
  • the second dielectric layer 15 is an optical material with a low refractive index.
  • the first dielectric layer 13 is also a low-refractive-index optical material layer
  • the second dielectric layer 15 is a right-angled square.
  • the light 06 is emitted from the light guide body 11 whose refractive index is lower than that of the structural layer, and is deflected upward through the transmission through the side surfaces 154 and 155 of the second dielectric layer. After passing through the next structural layer 14, the emitted light will be more collimated. There are multiple combinations of sandwich-like structures.
  • an embodiment of the present application discloses a flat panel display device 100 , including the surface light source device 10 shown in FIGS. 1 to 4 , and a panel 20 disposed on the rear exit surface.
  • the structure of the present invention can effectively reduce the light leakage caused by reflection and improve the CR of the front light source, without affecting the transparency, and the process feasibility is high.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Liquid Crystal (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

一种面光源装置（10），包括：导光体（11），包括入射面（111）、由入射面（111）的相对两侧分别延伸的前出射面（112）及后出射面（113）；发光体（12），沿着导光体（11）的入射面（111）侧设置；设置于后出射面（113）侧的结构层（14），结构层（14）用于改变导光体（11）射向结构层（14）的光的方向，并向远离后出射面（113）的方向发射出去；第二介质层（15）被结构层（14）包裹，第二介质层（15）材质小于结构层（14）材质的折射率。一种平板显示装置（100）包括面光源装置（10）。将第二介质层（15）包覆在具有一定折射率的结构层（14）内，并提出一种折射率搭配的结构方案，可以显著提高对比度，改善前置光源的视觉效果。

Description

面光源装置和平板显示装置
本发明要求2021年05月06日向中国专利局提交的、申请号为2021104901789、发明名称为“面光源装置和平板显示装置”的中国专利申请的优先权，该申请的全部内容通过引用结合在本文中。
技术领域
本发明属于液晶显示技术领域，具体涉及一种面光源装置和平板显示装置，特别是液晶反射式或透射式显示装置。
背景技术
目前，低功耗显示成为一种趋势，因此反射式液晶显示器以及透射式显示器应运而生。这类显示器不仅功耗较低，而且具有轻薄化，小型化的优点；但是他们有一个缺点，在较暗的环境下，会使显示亮度降低，影响观看感受。为了解决这种问题，通常会在模组里增加前置光源。由于使用场景的特殊性，前置光源需要有很高的透明度，并且具有一定的对比度，才能让使用者看到足够亮度且清晰的画面。
中国专利申请CN109031512A中导光膜结构为梯形结构，将此导光膜与导光板用胶层粘结在一起，相当于在导光板表面存在一倒梯形结构，光线射入到倒梯形结构侧面发散全反射后，在梯形底面出光。但是因为空气隙的存在，外界自然光照射之后，多层界面造成系统反射率较高，造成屏幕的对比度过低。
因此，针对上述技术问题，有必要提供一种新型的光源结构。
发明内容
本发明的目的在于提供一种面光源装置和液晶显示装置，以解决现有技术中前置光源对比度低的问题。
为了实现上述目的，本实用新型一实施例提供的技术方案如下：
一实施例中，一种面光源装置，包括：
导光体，包括入射面、由入射面的相对两侧分别延伸的前出射面及后出射面；
发光体，沿着所述导光体的入射面侧设置；
设置于所述后出射面侧的结构层，该结构层用于改变所述导光体射向所述结构层的光 的方向，并向远离所述后出射面的方向发射出去；
被所述结构层包覆的第二介质层，所述结构层材质的折射率大于所述第二介质层材质的折射率。
优选的，在上述的面光源装置中，所述结构层材质的折射率为1.65，所述第二介质层材质的折射率为1.33。
优选的，在上述的面光源装置中，还包括形成于所述后出射面和结构层之间的第一介质层，所述导光体材质的折射率大于或等于所述第一介质层材质的折射率。
优选的，在上述的面光源装置中，所述导光体材质的折射率为1.58，所述第一介质层材质的折射率为1.48。
优选的，在上述的面光源装置中，每个所述第二介质层，其垂直于结构层所在平面方向的截面为梯形，所述梯形的接近所述导光体的一边为长边，所述梯形的远离所述导光体的一边为短边。
优选的，在上述的面光源装置中，所述导光体包括与所述入射面相对的反射面，所述反射面与所述后出射面之间夹角为锐角，还包括沿着所述反射面侧设置的反射片。
优选的，在上述的面光源装置中，后出射面侧设置有多个叠加设置的结构层，该结构层用于改变所述导光体射向所述结构层的光的方向，并向远离所述后出射面的方向发射出去；每个结构层内分别包覆有第二介质层，所述结构层材质的折射率大于所述第二介质层材质的折射率。
优选的，在上述的面光源装置中，每个所述第二介质层，其垂直于结构层所在平面方向的截面为矩形。
优选的，在上述的面光源装置中，相邻的结构层之间、以及结构层和导光体之间设置有第一介质层，所述导光体材质的折射率大于所述第一介质层材质的折射率。
一实施例中，一种平板显示装置，包括：
所述的面光源装置；
设置于后出射面侧的平板显示面板。
与现有技术相比，针对现有的前置光源对比度低的问题，本发明将第二介质层包覆在具有一定折射率的结构层内，并提出一种折射率搭配的结构方案，可以显著提高对比度，改善现有前置光源的视觉效果。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请中记载的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请第一实施方式中面光源装置的结构示意图；
图2是本申请第一实施方式中垂直入射光线的光路示意图；
图3是本申请第一实施方式中入射面入射光线的光路示意图；
图4是本申请第二实施方式中面光源装置的结构和光路示意图；
图5是本申请一实施例中平板显示装置的结构示意图。
具体实施方式
以下将结合附图所示的各实施方式对本发明进行详细描述。但该等实施方式并不限制本发明，本领域的普通技术人员根据该等实施方式所做出的结构、方法、或功能上的变换均包含在本发明的保护范围内。
结合图1所示，本申请实施例提供了一种面光源装置10，包括导光体11以及向导光体11送光的发光体12。还包括依次设置于导光体11出射面一侧的第一介质层13、结构层14和第二介质层15，第二介质层包覆于结构层14内。该结构层用于改变所述导光体射向所述结构层的光的方向，并向远离所述后出射面的方向发射出去。
导光体11主要进行光线传输并出光，优选为平板结构，包括入射面111、由入射面111的相对两侧分别延伸的前出射面112及后出射面113，以及与入射面111相对的反射面114，前出射面112和后出射面113平行设置，反射面114与所述后出射面113之间夹角为锐角。
反射面114侧设置有反射片16，反射片16为具有一定反射率的膜片。
导光体11优选内部光吸收低的材料，例如丙烯酸薄片并且优选包括丙烯酸酯、PMMA(聚甲基丙烯酸甲酯)、PC(聚碳酸酯)、聚乙烯、光学玻璃等。
导光体11的形状可为适宜使用的任何形状，而并不局限于板状，例如导光体11也可以采用楔形板等结构，本案并不限制。
发光体12沿着导光体11的入射面111侧设置。发光体12为线光源，例如是多个LED灯排列成的灯条。发光体12发出的光经导光体11的入射面111进入导光体11，通过对发光体12的出射光线的角度进行设计，可使得其中大部分光在导光体11内发生全反射。
第一介质层13采用光学材料，导光体11的折射率n2大于第一介质层13的折射率n3，满足1<n3<n2。在优选的实施例中，第一介质层13通过胶合的方式结合于导光体11的后出射面113上。
结构层14采用光学材料，在优选的实施例中，结构层14通过胶合的方式结合于第一介质层13的表面。
结构层14的内部沿其平面方向开设有多个腔体，每个腔体内分别填充有一第二介质层15。第二介质层15可以是水、硅胶、UV胶等具有光学特性的液体、胶体，但不限于此。结构层14的折射率n4大于第二介质层15的折射率n5，满足1<n5<n4。
在制作时，可以沿着结构层14的平面方向，先在结构层14内加工形成多个条形的通道，然后在该通道内填充具有一定折射率的液体或胶体。最后将该结构层14整体胶合在第一介质层13的表面。
在优选的实施例中，第二介质层15垂直于结构14所在平面方向的截面为梯形，所述梯形的接近所述导光体11的一边为长边151，所述梯形的远离所述导光体11的一边为短边152。更优选的，第二介质层的截面为等腰梯形。
结合图2所示，在一具体实施例中，导光体11的折射率n2为1.58、第一介质层13的折射率n3为1.48、结构层14折射率n4为1.65、第二介质层15的折射率n5为1.33。前置光源关灯状态下对比度，黑态亮度主要由自然光入射造成。以垂直入射的01和02光线为例，根据菲涅尔反射定律：垂直入射的光线，反射率为：R＝(n1-n2)2/(n1+n2)2。由于其他各层折射率相差很小，界面反射可忽略，即反射光主要来自结构层的间隙。第二介质层15如果是空气，折射率为1，入射到面151和152时反射率为6％，如果第二介质层15折射率为1.33，反射率则低至1.2％。由界面反射导致的亮度大幅度下降。
进一步结合图3所示，提供了光线依次经过导光体11、第一介质层13、结构层14、第二介质层15的光路轨迹。
第二介质层15的倾角β为56°，截面为等腰梯形结构。光线由导光体11的入射面111入射，光线在导光体11中传播时，遵循斯涅耳折射定律：
N1sinθ1＝N2sinθ2
式中N1为介质1的折射率，θ1为入射角，N2为介质2的折射率，θ2为折射角。
本实施例的原理在于，光线从入射面111入射进导光体11后角度范围为α＝±arcsin(1/1.58)＝±40°，导光体11与第一介质层13的全反射角为γ＝arcsin(1.48/1.58)＝69.5°。其中光线03为边缘40°光线，入射到后出射面113的角度为50°，可以出射，经由 第一介质层13入射进结构层14，入射到长边151上角度为47°。由于第二介质层15充满结构层14的腔体，所以长边151和短边152之间为第二介质层15，折射率为1.33。光线从折射率为1.65的结构层14入射到折射率为1.33的第二介质层15中存在全反射，全反射角为54°，所以光线03可以出射。03光线入射到第二介质层15的侧面153角度为60°，大于全反射角，发生全反射，以小角度从结构层14的表面出射，实现一定的准直效果。光线04，入射到后出射面113上为69°，刚好出射，入射到第二介质层15的侧面153上角度为61°，发生全发射。光线05入射到长边151，发生全反射，返回到导光体11，来回反射至倾斜具有反射作用的尾端，角度进行一定调节，后续即可有机会出射。其他小角度光线，均可由倾斜具有反射作用的尾端进行调节进而循环出射。
结合图4所示，在第二实施例中，与图1的结构相比，后出射面113侧设置有多个叠加设置的结构层14，每个结构层14内分别包覆有第二介质层15，该第二介质层15用于改变所述导光体11射向所述第二介质层15的光的方向，并向远离所述后出射面的方向发射出去，所述结构层14的折射率大于所述第二介质层15的折射率。
在优选的实施例中，每个所述第二介质层15，其垂直于结构层所在平面方向的截面为矩形。
进一步地，相邻的结构层14之间、以及结构层14和导光体11之间设置有第一介质层13，导光体11的折射率大于所述第一介质层13的折射率。
本实施例中，结构层14是高折射率的光学材料，第二介质层15是低折射率的光学材料。第一介质层13也是低折射率的光学材料层，第二介质层15为直角方形。光线06由低于折射率低于结构层的导光体11中出射，经由第二介质层的侧面154、155的透射，向上偏折。再经过下一个结构层14，出光将更加准直。类似三明治的结构搭配，可以有多个组合。
结合图5所示，本申请实施例披露了一种平板显示装置100，包括图1至4所示的面光源装置10，以及设置于后出射面侧的面板20。
综上所述，本发明中的结构可以有效的降低由反射导致的漏光，提高前置光源的CR，并不会影响透明度，工艺可行性高。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有 变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
此外，应当理解，虽然本说明书按照实施例加以描述，但并非每个实施例仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。

Claims (18)

  1. 一种面光源装置，其特征在于，包括：
    导光体，包括入射面、由入射面的相对两侧分别延伸的前出射面及后出射面；
    发光体，沿着所述导光体的入射面侧设置；
    设置于所述后出射面侧的结构层，该结构层用于改变所述导光体射向所述结构层的光的方向，并向远离所述后出射面的方向发射出去；
    被所述结构层包覆的第二介质层，
    所述结构层材质的折射率大于所述第二介质层第二介质层材质的折射率。
  2. 根据权利要求1所述的面光源装置，其特征在于，所述结构层材质的折射率为1.65，所述第二介质层材质的折射率为1.33。
  3. 根据权利要求1所述的面光源装置，其特征在于，还包括形成于所述后出射面和结构层之间的第一介质层，
    所述导光体材质的折射率大于或等于所述第一介质层材质的折射率。
  4. 根据权利要求3所述的面光源装置，其特征在于，所述导光体材质的折射率为1.58，所述第一介质层材质的折射率为1.48。
  5. 根据权利要求1所述的面光源装置，其特征在于，每个所述第二介质层，其垂直于结构层所在平面方向的截面为梯形，
    所述梯形的接近所述导光体的一边为长边，所述梯形的远离所述导光体的一边为短边。
  6. 根据权利要求1所述的面光源装置，其特征在于，所述导光体包括与所述入射面相对的反射面，所述反射面与所述后出射面之间夹角为锐角，同上
    还包括沿着所述反射面侧设置的反射片。
  7. 根据权利要求1所述的面光源装置，其特征在于，后出射面侧设置有多个叠加设置的结构层，该结构层用于改变所述导光体射向所述结构层的光的方向，并向远离所述后出射面的方向发射出去；
    每个结构层内分别包覆有第二介质层，
    所述结构层材质的折射率大于所述第二介质层材质的折射率。
  8. 根据权利要求7所述的面光源装置，其特征在于，每个所述第二介质层，其垂直于结构层所在平面方向的截面为矩形。
  9. 根据权利要求7所述的面光源装置，其特征在于，相邻的结构层之间、以及 结构层和导光体之间设置有第一介质层，
    所述导光体材质的折射率大于所述第一介质层材质的折射率。
  10. 一种平板显示装置，其特征在于，包括面光源装置和设置于后出射面侧的平板显示面板，所述面光源装置包括：
    导光体，包括入射面、由入射面的相对两侧分别延伸的前出射面及后出射面；
    发光体，沿着所述导光体的入射面侧设置；
    设置于所述后出射面侧的结构层，该结构层用于改变所述导光体射向所述结构层的光的方向，并向远离所述后出射面的方向发射出去；
    被所述结构层包覆的第二介质层，
    所述结构层材质的折射率大于所述第二介质层第二介质层材质的折射率。
  11. 根据权利要求10所述的平板显示装置，其特征在于，所述结构层材质的折射率为1.65，所述第二介质层材质的折射率为1.33。
  12. 根据权利要求10所述的平板显示装置，其特征在于，还包括形成于所述后出射面和结构层之间的第一介质层，
    所述导光体材质的折射率大于或等于所述第一介质层材质的折射率。
  13. 根据权利要求12所述的平板显示装置，其特征在于，所述导光体材质的折射率为1.58，所述第一介质层材质的折射率为1.48。
  14. 根据权利要求10所述的平板显示装置，其特征在于，每个所述第二介质层，其垂直于结构层所在平面方向的截面为梯形，
    所述梯形的接近所述导光体的一边为长边，所述梯形的远离所述导光体的一边为短边。
  15. 根据权利要求10所述的平板显示装置，其特征在于，所述导光体包括与所述入射面相对的反射面，所述反射面与所述后出射面之间夹角为锐角，同上
    还包括沿着所述反射面侧设置的反射片。
  16. 根据权利要求10所述的平板显示装置，其特征在于，后出射面侧设置有多个叠加设置的结构层，该结构层用于改变所述导光体射向所述结构层的光的方向，并向远离所述后出射面的方向发射出去；
    每个结构层内分别包覆有第二介质层，
    所述结构层材质的折射率大于所述第二介质层材质的折射率。
  17. 根据权利要求16所述的平板显示装置，其特征在于，每个所述第二介质层， 其垂直于结构层所在平面方向的截面为矩形。
  18. 根据权利要求16所述的平板显示装置，其特征在于，相邻的结构层之间、以及结构层和导光体之间设置有第一介质层，
    所述导光体材质的折射率大于所述第一介质层材质的折射率。
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JP2024511733A (ja) 2024-03-15
CN113156707B (zh) 2022-09-09

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