WO2022241687A1 - 背光模组、显示装置和制作方法 - Google Patents

背光模组、显示装置和制作方法 Download PDF

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Publication number
WO2022241687A1
WO2022241687A1 PCT/CN2021/094697 CN2021094697W WO2022241687A1 WO 2022241687 A1 WO2022241687 A1 WO 2022241687A1 CN 2021094697 W CN2021094697 W CN 2021094697W WO 2022241687 A1 WO2022241687 A1 WO 2022241687A1
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WIPO (PCT)
Prior art keywords
light
pit
guide plate
light guide
backlight module
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PCT/CN2021/094697
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English (en)
French (fr)
Inventor
冯贺
杨同华
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to CN202180001207.9A priority Critical patent/CN115885209A/zh
Priority to PCT/CN2021/094697 priority patent/WO2022241687A1/zh
Publication of WO2022241687A1 publication Critical patent/WO2022241687A1/zh

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • the present disclosure relates to the technical field of semiconductors, and in particular to a backlight module, a display device and a manufacturing method.
  • Liquid crystal display has replaced cathode ray tube display and become the mainstream technology in the field of flat panel display; and because of its Its own advantages make it an ideal display device in the minds of the market and consumers.
  • the light-emitting elements are divided into partitions, and the lighting of the light-emitting elements is controlled by the area to achieve dynamic adjustment.
  • Embodiments of the disclosure provide a backlight module, a display device and a manufacturing method.
  • the backlight module includes:
  • a light guide plate the light guide plate is stacked with the light-emitting substrate, the side of the light guide plate facing away from the light-emitting substrate has a plurality of first pits, the first pits are filled with first fillers, the The interface of the first pit facing the light guide plate has a second filler layer; the refractive index of the second filler layer is lower than that of the first filler.
  • the light guide plate further includes a second pit whose notch faces the first pit and communicates with the first pit, and the second filler layer is filled in the first pit. inside the second pit.
  • the shape of the first pit is roughly spherical, and the shape of the second pit is roughly spherical.
  • the diameter of the second pit is 1/80th to 1/20th of the diameter of the first pit.
  • the first filler includes a matrix, first particles dispersed in the matrix, second particles, and third particles, wherein the first particles emit red light, and the The second particles emit green light, the third particles emit blue light, and the refractive index of the matrix is lower than that of the first filler.
  • the material of the first particle includes: CaAlSiN3:Eu2+; the material of the second particle includes: MSrAl3O7:Eu2+; the material of the third particle includes: Na13Sr2Ta2(PO4)9: xTm3+.
  • the material of the second filler layer includes optical glue.
  • the light-emitting substrate includes a base substrate, and a plurality of light-emitting elements located on a side of the base substrate facing the light guide plate, and the first pit is the same as the light-emitting element.
  • the orthographic projection of the first pit on the base substrate covers the orthographic projection of the light emitting element on the base substrate.
  • the backlight module further includes a covering part located at the opening of the first pit.
  • a sealing frame is further provided in the frame area between the light guide plate and the light-emitting substrate; the side of the light guide plate facing away from the light-emitting substrate further has a diffusion film, and the diffusion film The side away from the light guide plate also has an anti-reflection film.
  • An embodiment of the present disclosure provides a display device, which includes the backlight module provided by the embodiment of the present disclosure.
  • An embodiment of the present disclosure provides a method for manufacturing a backlight module, including:
  • forming a light guide plate on the light emitting side of the light-emitting substrate includes:
  • a first filler is formed in the first pit.
  • the formation of the second filler layer at the interface of the first pit facing the light guide plate includes:
  • the second filler layer is formed within the second recess.
  • the formation of the first pit on the side of the light guide plate away from the light-emitting substrate includes:
  • the second pit forming a plurality of notches on the periphery of the first pit facing the first pit and communicating with the first pit includes:
  • a plurality of the second pits are formed around the first pits by a laser drilling process.
  • the forming the second filler layer in the second pit includes:
  • FIG. 1 is one of the structural schematic diagrams of a backlight module provided by an embodiment of the present disclosure
  • FIG. 2 is the second structural schematic diagram of the backlight module provided by the embodiment of the present disclosure.
  • FIG. 3 is a schematic structural diagram of a first pit and a second pit provided by an embodiment of the present disclosure
  • FIG. 4 is the third structural schematic diagram of the backlight module provided by the embodiment of the present disclosure.
  • FIG. 5 is one of the schematic diagrams of the manufacturing process of the backlight module provided by the embodiment of the present disclosure.
  • FIG. 6 is the second schematic diagram of the manufacturing process of the backlight module provided by the embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of forming a first pit provided by an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of forming a second pit provided by an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of forming a first filler layer according to an embodiment of the present disclosure.
  • the material in the light guide plate (such as quantum dot ink) and the refractive index of the light guide plate are basically equal (the refractive index of both is roughly 1.5), the light cannot be fully reflected in the light guide plate, and the light will go sideways Exit, resulting in light leakage, only light with a small angle will emerge from the light-emitting surface, resulting in a decrease in light-extraction efficiency and light leakage.
  • an embodiment of the present disclosure provides a backlight module, which includes:
  • the light guide plate 2, the light guide plate 2 and the light-emitting substrate 1 are stacked, and the side of the light guide plate 2 facing away from the light-emitting substrate 1 has a plurality of first pits 211, and the first pits 211 are filled with a first filler 221, and the first pits
  • the interface of the pit 211 facing the light guide plate 2 has a second filler layer 222 ; the refractive index of the second filler layer 222 is lower than that of the first filler 221 .
  • the side of the light guide plate 2 facing away from the light-emitting substrate 1 has a plurality of first pits 211, and the interface of the first pits 211 facing the light guide plate 2 has a second filler layer 222; Filled with the first filler 221, the refractive index of the second filler layer 222 is lower than that of the first filler 221, so that the light incident into the first pit 211 can be placed in a position other than the first notch 210 , when it is incident on the second filler layer 222, full emission is emitted, so that most of the light is emitted from the position of the first notch 210, thereby improving the light extraction efficiency and improving the light leakage problem of the light guide plate 2.
  • the light guide plate 2 further includes a second pit 212 whose notch faces the first pit 211 and communicates with the first pit 211 .
  • the material layer 222 is filled in the second cavity 212 .
  • the light guide plate 2 further includes a second pit 212 whose notch faces the first pit 211 and communicates with the first pit 211 .
  • the second cavity 212 is filled with the second filler layer 222 in the second cavity 212 , which facilitates the fabrication of the second filler layer 222 . It should be noted that, FIG.
  • a cavity 211 may be filled with a first filler 221
  • a second cavity 212 may be filled with a second filler layer 222 .
  • the shape of the first dimple 211 is roughly spherical, and the shape of the second dimple 212 is roughly spherical.
  • the shape of the first pit 211 is roughly spherical, and the shape of the second pit 212 is roughly spherical, which is conducive to realizing total reflection of light and improving the light extraction efficiency of the light guide plate 2 .
  • the diameter of the second pit 212 is one-eighth to one-hundred-twentieth of the diameter of the first pit 211 .
  • a plurality of second dimples 212 may be closely arranged around the first dimples 211 .
  • the diameter of the second pit 212 may specifically be 1um ⁇ 10um; the diameter of the first pit 211 may be 100um ⁇ 1mm.
  • the first filler 221 may include a matrix 22, and dispersed in the matrix 22 are first particles 231, second particles 232, and third particles 233, wherein the first The particles 231 emit red light, the second particles 232 emit green light, and the third particles 233 emit blue light.
  • the refractive index of the second filler layer 222 is lower than that of the matrix 22 .
  • the first filler 221 may include a matrix 22, and dispersed in the matrix 22 are first particles 231, second particles 232, and third particles 233.
  • the first particles 231 emit red light, and the second particles 232 emit red light.
  • the third particle 233 emits blue light
  • the first particle 231, the second particle 232, and the third particle 233 can mix to form white light
  • the formed white light contains less light in other wavelength bands except red light, green light, and blue light
  • the red light, green light, and blue light can have higher color purity and improve the color gamut of display.
  • the red, green, and blue light-emitting materials are directly filled in the first pit 211, and there is no need for packaging on the chip, nor for the backlight film material. It is small, which is conducive to thinning, and because of the direct use of red, green, and blue light-emitting materials, the purity of the three-color light in the final spectrum is also improved, and the requirement of high color gamut is achieved.
  • the refractive index of the matrix 22 may be approximately the same as that of the light guide plate 2 .
  • the material of the first particle 231 may include: CaAlSiN3:Eu2+; the material of the second particle 232 includes: MSrAl3O7:Eu2+; the material of the third particle 233 includes: Na13Sr2Ta2(PO4)9:xTm3+.
  • the material of the first particle 231 may include: CaAlSiN3:Eu2+; the material of the second particle 232 includes: MSrAl3O7:Eu2+; the material of the third particle 233 includes: Na13Sr2Ta2(PO4)9:xTm3+, which can make the emission The corresponding light color purity is higher.
  • CaAlSiN3:Eu2+ red fluorescent material can achieve red emission between 637-646nm; MSrAl3O7:Eu2+ series green fluorescent material can achieve green emission at about 517nm; Na13Sr2Ta2(PO4)9:xTm3+ blue fluorescent material can achieve 457nm Left and right blue emit light.
  • the free distribution of light intensity in the three bands can be realized by adjusting the ratio of red, green, and blue light-emitting materials.
  • the material of the second filler layer 222 includes optical glue.
  • the refractive index of the optical glue is generally equal to that of air. In this way, an air-like layer can be formed in the second cavity 212 to achieve total reflection.
  • the light-emitting substrate 1 includes a base substrate 11 and a plurality of light-emitting elements 12 located on the side of the base substrate 11 facing the light guide plate 2 .
  • the elements 12 correspond one to one, and the orthographic projection of the first recess 211 on the base substrate 11 covers the orthographic projection of the light emitting element 12 on the base substrate 11 .
  • the light emitting element 12 may be a Mini-LED or a Micro-LED.
  • the backlight module further includes a covering portion 3 located at the opening of the first pit 211 to seal and protect the luminescent particles in the first pit 211 .
  • the covering part 3 may be a transparent structure, so that the light in the first pit 211 is emitted through this position.
  • a sealing frame 4 is also provided in the frame area between the light guide plate 2 and the light emitting substrate 1, so as to realize the sealing of the light guide plate 2 and the light emitting substrate 1; the light guide plate 2
  • the side away from the light-emitting substrate 1 further has a diffusion film 5
  • the side of the diffusion film 5 away from the light guide plate 2 further has an anti-reflection film 6 .
  • the side of the light-emitting substrate 1 facing away from the light guide plate 2 can also be provided with a reflective film 7 to reflect the light emitted toward the light-emitting substrate 1 back to the light guide plate 2 again, so as to improve light extraction efficiency.
  • a microstructure 8 is provided on the side of the light guide plate 2 facing the light-emitting substrate 1 , and the microstructure 8 can make the light emitted by the light-emitting element 12 evenly incident on the light guide plate 2 .
  • the embodiment of the present disclosure provides a display device, which includes the backlight module provided by the embodiment of the present disclosure.
  • An embodiment of the present disclosure provides a manufacturing method of a backlight module, as shown in FIG. 5 and FIG. 6 , which includes:
  • Step S100 forming a light-emitting substrate
  • Step S200 forming a light guide plate on the light emitting side of the light emitting substrate
  • step S200 forming a light guide plate on the light emitting side of the light-emitting substrate, includes:
  • Step S210 forming a first pit on the side of the light guide plate away from the light-emitting substrate
  • Step S220 forming a second filler layer at the interface where the first pit faces the light guide plate
  • Step S230 forming a first filling in the first pit.
  • step S220 forming a second filler layer at the interface where the first pit faces the light guide plate includes:
  • Step S221 forming a plurality of second pits on the periphery of the first pit with notches facing the first pit and communicating with the first pit;
  • Step S222 forming a second filling layer in the second pit.
  • step S210 forming the first pit on the side of the light guide plate away from the light-emitting substrate includes:
  • Step S211 making a cylindrical pit on the side of the light guide plate facing away from the light-emitting substrate through a laser drilling process
  • Step S212 forming a first pit along the inner wall of the cylindrical pit through a laser etching process
  • step S221 forming a plurality of second pits on the periphery of the first pit with notches facing the first pit and communicating with the first pit, including:
  • a plurality of second pits are formed around the first pits.
  • step S222 forming a second filling layer in the second pit includes:
  • Step 1 The first pit 211 is drilled with a laser.
  • the manufacturing method is shown in FIG. 7 .
  • a cylindrical hole is made, and then a spherical first pit 211 is formed by laser etching along the inner wall of the cylinder;
  • Step 2 The first pit 212 is drilled with a laser.
  • the manufacturing method is shown in FIG. 8 , and laser drilling is performed around the inner wall of the first pit 211 to form a plurality of second pits 212;
  • Step 3 the manufacturing method of the air-like interface is as shown in Figure 9, filling the first pit 211 and the second pit 212 with a material (such as optical glue 9) with the same refractive index as the air layer, and then filling the first pit 211
  • a material such as optical glue 9
  • the optical glue 9 inside is etched away, and only the optical glue 9 inside the second pit 212 remains, thus forming a so-called air-like interface.
  • the side of the light guide plate 2 facing away from the light-emitting substrate 1 has a plurality of first pits 211, and the interface of the first pits 211 facing the light guide plate 2 has a second filler layer 222; Filled with the first filler 221, the refractive index of the second filler layer 222 is lower than that of the first filler 221, so that the light incident into the first pit 211 can be placed in a position other than the first notch 210 , when it is incident on the second filler layer 222, full emission is emitted, so that most of the light is emitted from the position of the first notch 210, thereby improving the light extraction efficiency and improving the light leakage problem of the light guide plate 2.

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Abstract

一种背光模组、显示装置和制作方法,背光模组包括发光基板(1),导光板(2),导光板(2)与发光基板(1)叠置,导光板(2)背离发光基板(1)的一侧具有多个第一凹坑(211),第一凹坑(211)内填充有第一填充物(221),第一凹坑(211)面向导光板(2)的界面具有第二填充物层(222),第二填充物层(222)的折射率低于第一填充物(221)的折射率。

Description

背光模组、显示装置和制作方法 技术领域
本公开涉及半导体技术领域,尤其涉及一种背光模组、显示装置和制作方法。
背景技术
随着薄膜场效应晶体管液晶显示技术的发展和工业技术的进步,液晶显示器件生产成本降低、制造工艺的日益完善,液晶显示已经取代了阴极射线管显示成为平板显示领域的主流技术;且由于其本身所具有的优点,在市场和消费者心中成为理想的显示器件。
目前的动态可调背光,通过使用直下式背光,将发光元件进行分区,区域控制发光元件的开光,实现动态调节。
发明内容
本公开实施例提供一种背光模组、显示装置和制作方法。所述背光模组,包括:
发光基板;
导光板,所述导光板与所述发光基板叠置,所述导光板背离所述发光基板的一侧具有多个第一凹坑,所述第一凹坑内填充有第一填充物,所述第一凹坑面向所述导光板的界面具有第二填充物层;所述第二填充物层的折射率低于所述第一填充物的折射率。
在一种可能的实施方式中,所述导光板还包括凹口朝向所述第一凹坑、且与所述第一凹坑连通的第二凹坑,所述第二填充物层填充于所述第二凹坑内。
在一种可能的实施方式中,所述第一凹坑的形状大致为球形,所述第二凹坑的形状大致为球形。
在一种可能的实施方式中,所述第二凹坑的直径为所述第一凹坑直径的八十分之一~一百二十分之一。
在一种可能的实施方式中,所述第一填充物包括基体,分散于所述基体中第一粒子,第二粒子,以及第三粒子,其中,所述第一粒子出射红光,所述第二粒子出射绿光,所述第三粒子出射蓝光,所述基体的折射率低于所述第一填充物的折射率。
在一种可能的实施方式中,所述第一粒子的材料包括:CaAlSiN3:Eu2+;所述第二粒子的材料包括:MSrAl3O7:Eu2+;所述第三粒子的材料包括:Na13Sr2Ta2(PO4)9:xTm3+。
在一种可能的实施方式中,所述第二填充物层的材料包括光学胶。
在一种可能的实施方式中,所述发光基板包括衬底基板,以及位于所述衬底基板面向所述导光板一侧的多个发光元件,所述第一凹坑与所述发光元件一一对应,所述第一凹坑在所述衬底基板的正投影覆盖所述发光元件在所述衬底基板的正投影。
在一种可能的实施方式中,所述背光模组还包括位于所述第一凹坑开口的覆盖部。
在一种可能的实施方式中,所述导光板与所述发光基板之间在边框区还设置有密封边框;所述导光板背离所述发光基板的一侧还具有扩散膜,所述扩散膜背离所述导光板的一侧还具有增透膜。
本公开实施例提供一种显示装置,其中,包括如本公开实施例提供的所述背光模组。
本公开实施例提供一种背光模组的制作方法,其中,包括:
形成发光基板;
在所述发光基板的出光侧形成导光板;
其中,所述在所述发光基板的出光侧形成导光板,包括:
在所述导光板的背离所述发光基板的一侧形成第一凹坑;
在所述第一凹坑面向所述导光板的界面形成第二填充物层;
在所述第一凹坑内形成第一填充物。
在一种可能的实施方式中,所述在所述第一凹坑面向所述导光板的界面形成第二填充物层,包括:
在所述第一凹坑的外围形成多个凹口朝向所述第一凹坑、且与所述第一凹坑连通的第二凹坑;
在所述第二凹坑内形成所述第二填充物层。
在一种可能的实施方式中,所述在所述导光板背离所述发光基板的一侧形成第一凹坑,包括:
通过激光打孔工艺,在所述导光板背离所述发光基板的一侧制作圆柱坑;
通过激光刻蚀工艺,沿着所述圆柱坑的内壁,形成第一凹坑;
所述在所述第一凹坑的外围形成多个凹口朝向所述第一凹坑、且与所述第一凹坑连通的第二凹坑,包括:
通过激光打孔工艺,围绕所述第一凹坑形成多个所述第二凹坑。
在一种可能的实施方式中,所述在所述第二凹坑内形成所述第二填充物层,包括:
在所述第二凹坑内、所述第一凹坑内填充光学胶;
刻蚀去除所述第一凹坑内的所述光学胶。
附图说明
图1为本公开实施例提供的背光模组结构示意图之一;
图2为本公开实施例提供的背光模组结构示意图之二;
图3为本公开实施例提供的第一凹坑、第二凹坑的结构示意图;
图4为本公开实施例提供的背光模组结构示意图之三;
图5为本公开实施例提供的背光模组制作流程示意图之一;
图6为本公开实施例提供的背光模组制作流程示意图之二;
图7为本公开实施例提供的形成第一凹坑示意图;
图8为本公开实施例提供的形成第二凹坑示意图;
图9为本公开实施例提供的形成第一填充物层示意图。
具体实施方式
为了使得本公开实施例的目的、技术方案和优点更加清楚,下面将结合本公开实施例的附图,对本公开实施例的技术方案进行清楚、完整地描述。显然,所描述的实施例是本公开的一部分实施例,而不是全部的实施例。基于所描述的本公开的实施例,本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例,都属于本公开保护的范围。
除非另外定义,本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性,而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同,而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接,而是可以包括电性的连接,不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系,当被描述对象的绝对位置改变后,则该相对位置关系也可能相应地改变。
为了保持本公开实施例的以下说明清楚且简明,本公开省略了已知功能和已知部件的详细说明。
目前的动态背光设计结构,导光板内物质(如量子点墨水)和导光板的折射率基本相等(二者折射率均大致为1.5),光线在导光板内不能全反射,光会向侧向出射,导致漏光,只有小角度的光会从出光面出射,造成出光效率下降和漏光。
有鉴于此,参见图1所示,本公开实施例提供一种背光模组,其中,包括:
发光基板1;
导光板2,导光板2与发光基板1叠置,导光板2背离发光基板1的一侧 具有多个第一凹坑211,第一凹坑211内填充有第一填充物221,第一凹坑211面向导光板2的界面具有第二填充物层222;第二填充物层222的折射率低于第一填充物221的折射率。
本公开实施例中,导光板2背离发光基板1的一侧具有多个第一凹坑211,第一凹坑211面向导光板2的界面具有第二填充物层222;第一凹坑211内填充有第一填充物221,第二填充物层222的折射率低于第一填充物221的折射率,可以使入射到第一凹坑211内的光在除第一凹口210以外的位置,在入射到第二填充物层222时,发射全发射,使大多数光由第一凹口210位置处出射,进而可以提高出光效率,改善导光板2漏光的问题。
在一种可能的实施方式中,参见图2和图3所示,导光板2还包括凹口朝向第一凹坑211、且与第一凹坑211连通的第二凹坑212,第二填充物层222填充于第二凹坑212内。本公开实施例中,导光板2还包括凹口朝向第一凹坑211、且与第一凹坑211连通的第二凹坑212,可以在具体形成第二填充物层222时,先形成第二凹坑212,在第二凹坑212内填充第二填充物层222,方便第二填充物层222的制作。需要说明的是,图3是为了更清楚地示意第一凹坑211和第二凹坑212的结构,进而未示出第二填充物层222与第一填充物221,在具体实施时,第一凹坑内211可以填充有第一填充物221,第二凹坑212内填充有第二填充物层222。
在一种可能的实施方式中,结合图2或图3所示,第一凹坑211的形状大致为球形,第二凹坑212的形状大致为球形。本公开实施例中,第一凹坑211的形状大致为球形,第二凹坑212的形状大致为球形,有利于光实现全反射,提高导光板2的出光效率。
在一种可能的实施方式中,第二凹坑212的直径为第一凹坑211直径的八十分之一~一百二十分之一。具体的,多个第二凹坑212可以是环绕第一凹坑211紧密排列。具体的,第二凹坑212的直径具体可以为1um~10um;第一凹坑211的直径可以为100um~1mm。
在一种可能的实施方式中,参见图4所示,第一填充物221可以包括基 体22,分散于基体22中第一粒子231,第二粒子232,以及第三粒子233,其中,第一粒子231出射红光,第二粒子232出射绿光,第三粒子233出射蓝光,第二填充物层222的折射率低于基体22的折射率。本公开实施例中,第一填充物221可以包括基体22,分散于基体22中第一粒子231,第二粒子232,以及第三粒子233,第一粒子231出射红光,第二粒子232出射绿光,第三粒子233出射蓝光,第一粒子231,第二粒子232,第三粒子233可以混合形成白光,且形成的白光除含有红光、绿光、蓝光以外,其它波段光含量较少,形成的白光再经过红光滤光膜、绿光滤光膜、蓝光滤光膜时,可以使出来的红光、绿光、蓝光色纯度较高,提高显示时的色域。而且,相比于传统的背光模组,本公开实施例中,在第一凹坑211内直接填充红、绿、蓝发光材料,不需要在芯片上进行封装,也不需要背光膜材,厚度小,利于轻薄化,且由于直接使用红、绿、蓝发光材料,也使得最终光谱中三色光纯度提升,实现高色域的要求。
具体的,基体22的折射率可以与导光板2的折射率大致相同。
在一种可能的实施方式中,第一粒子231的材料可以包括:CaAlSiN3:Eu2+;第二粒子232的材料包括:MSrAl3O7:Eu2+;第三粒子233的材料包括:Na13Sr2Ta2(PO4)9:xTm3+。本公开实施例中,第一粒子231的材料可以包括:CaAlSiN3:Eu2+;第二粒子232的材料包括:MSrAl3O7:Eu2+;第三粒子233的材料包括:Na13Sr2Ta2(PO4)9:xTm3+,可以使出射的相应的光的色纯度较高。具体的,CaAlSiN3:Eu2+红色荧光材料能实现637-646nm间的红色发射光;MSrAl3O7:Eu2+系列绿色荧光材料能实现517nm左右的绿色发射光;Na13Sr2Ta2(PO4)9:xTm3+蓝色荧光材料能实现457nm左右的蓝色发射光。
具体的,可通过调整红、绿、蓝发光材料的比例,实现三波段光强度自由分配。
在一种可能的实施方式中,第二填充物层222的材料包括光学胶。光学胶的折射率一般与空气的折射率大致相等,如此,可以使第二凹坑212内形成一类似空气层,实现全反射。
在一种可能的实施方式中,结合图4所示,发光基板1包括衬底基板11,以及位于衬底基板11面向导光板2一侧的多个发光元件12,第一凹坑211与发光元件12一一对应,第一凹坑211在衬底基板11的正投影覆盖发光元件12在衬底基板11的正投影。
具体的,发光元件12可以为Mini-LED或Micro-LED。
在一种可能的实施方式中,结合图4所示,背光模组还包括位于第一凹坑211开口的覆盖部3,以对第一凹坑211内的发光粒子进行密封保护。具体的,覆盖部3可以为透明结构,以便于第一凹坑211内的光经该位置出射。
在一种可能的实施方式中,结合图4所示,导光板2与发光基板1之间在边框区还设置有密封边框4,以实现对导光板2与发光基板1进行密封;导光板2背离发光基板1的一侧还具有扩散膜5,扩散膜5背离导光板2的一侧还具有增透膜6。
具体的,发光基板1背离导光板2的一侧还可以设置有反射膜7,以将朝向发光基板1出射的光再次反射回导光板2,以提高出光效率。
具体的,导光板2面向发光基板1的一面还设置微结构8,该微结构8可以使发光元件12发光的光均匀入射到导光板2。
本公开实施例提供一种显示装置,其中,包括如本公开实施例提供的背光模组。
本公开实施例提供一种背光模组的制作方法,参见图5和图6所示,其中,包括:
步骤S100、形成发光基板;
步骤S200、在发光基板的出光侧形成导光板;
其中,步骤S200、在发光基板的出光侧形成导光板,包括:
步骤S210、在导光板的背离发光基板的一侧形成第一凹坑;
步骤S220、在第一凹坑面向导光板的界面形成第二填充物层;
步骤S230、在第一凹坑内形成第一填充物。
在一种可能的实施方式中,关于步骤S220、在第一凹坑面向导光板的界 面形成第二填充物层,包括:
步骤S221、在第一凹坑的外围形成多个凹口朝向第一凹坑、且与第一凹坑连通的第二凹坑;
步骤S222、在第二凹坑内形成第二填充物层。
在一种可能的实施方式中,关于步骤S210、在导光板背离发光基板的一侧形成第一凹坑,包括:
步骤S211、通过激光打孔工艺,在导光板背离发光基板的一侧制作圆柱坑;
步骤S212、通过激光刻蚀工艺,沿着圆柱坑的内壁,形成第一凹坑;
相应的,步骤S221、在第一凹坑的外围形成多个凹口朝向第一凹坑、且与第一凹坑连通的第二凹坑,包括:
通过激光打孔工艺,围绕第一凹坑形成多个第二凹坑。
在一种可能的实施方式中,关于步骤S222、在第二凹坑内形成第二填充物层,包括:
在第二凹坑内、第一凹坑内填充光学胶;
刻蚀去除第一凹坑内的光学胶。
为了更清楚地理解本公开实施例提供的背光模组中的第一凹坑和第二凹坑制作方法,以下进一步详细说明:
步骤一、第一凹坑211利用激光打孔,制作方法如图7所示,先制作圆柱孔,再沿着圆柱内壁激光刻蚀形成球形的第一凹坑211;
步骤二、第一凹坑212利用激光打孔,制作方法如图8所示,围绕第一凹坑211内壁进行激光打孔,形成多个第二凹坑212;
步骤三、类空气界面制作方法如图9所示,向第一凹坑211、第二凹坑212内填充折射率同空气层相同的材料(如光学胶9),再将第一凹坑211内的光学胶9刻蚀掉,只保留第二凹坑212内的光学胶9,这样就形成了所谓的类空气界面。
本公开实施例中,导光板2背离发光基板1的一侧具有多个第一凹坑211, 第一凹坑211面向导光板2的界面具有第二填充物层222;第一凹坑211内填充有第一填充物221,第二填充物层222的折射率低于第一填充物221的折射率,可以使入射到第一凹坑211内的光在除第一凹口210以外的位置,在入射到第二填充物层222时,发射全发射,使大多数光由第一凹口210位置处出射,进而可以提高出光效率,改善导光板2漏光的问题。
尽管已描述了本公开的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例作出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本公开范围的所有变更和修改。
显然,本领域的技术人员可以对本公开实施例进行各种改动和变型而不脱离本公开实施例的精神和范围。这样,倘若本公开实施例的这些修改和变型属于本公开权利要求及其等同技术的范围之内,则本公开也意图包含这些改动和变型在内。

Claims (15)

  1. 一种背光模组,其中,包括:
    发光基板;
    导光板,所述导光板与所述发光基板叠置,所述导光板背离所述发光基板的一侧具有多个第一凹坑,所述第一凹坑内填充有第一填充物,所述第一凹坑面向所述导光板的界面具有第二填充物层;所述第二填充物层的折射率低于所述第一填充物的折射率。
  2. 如权利要求1所述的背光模组,其中,所述导光板还包括凹口朝向所述第一凹坑、且与所述第一凹坑连通的第二凹坑,所述第二填充物层填充于所述第二凹坑内。
  3. 如权利要求2所述的背光模组,其中,所述第一凹坑的形状大致为球形,所述第二凹坑的形状大致为球形。
  4. 如权利要求3所述的背光模组,其中,所述第二凹坑的直径为所述第一凹坑直径的八十分之一~一百二十分之一。
  5. 如权利要求1-4任一项所述的背光模组,其中,所述第一填充物包括基体,分散于所述基体中第一粒子,第二粒子,以及第三粒子,其中,所述第一粒子出射红光,所述第二粒子出射绿光,所述第三粒子出射蓝光,所述第二填充物层的折射率低于所述基体的折射率。
  6. 如权利要求5所述的背光模组,其中,所述第一粒子的材料包括:CaAlSiN3:Eu2+;所述第二粒子的材料包括:MSrAl3O7:Eu2+;所述第三粒子的材料包括:Na13Sr2Ta2(PO4)9:xTm3+。
  7. 如权利要求1所述的背光模组,其中,所述第二填充物层的材料包括光学胶。
  8. 如权利要求1所述的背光模组,其中,所述发光基板包括衬底基板,以及位于所述衬底基板面向所述导光板一侧的多个发光元件,所述第一凹坑与所述发光元件一一对应,所述第一凹坑在所述衬底基板的正投影覆盖所述 发光元件在所述衬底基板的正投影。
  9. 如权利要求1所述的背光模组,其中,所述背光模组还包括位于所述第一凹坑开口的覆盖部。
  10. 如权利要求1所述的背光模组,其中,所述导光板与所述发光基板之间在边框区还设置有密封边框;所述导光板背离所述发光基板的一侧还具有扩散膜,所述扩散膜背离所述导光板的一侧还具有增透膜。
  11. 一种显示装置,其中,包括如权利要求1-10任一项所述的背光模组。
  12. 一种背光模组的制作方法,其中,包括:
    形成发光基板;
    在所述发光基板的出光侧形成导光板;
    其中,所述在所述发光基板的出光侧形成导光板,包括:
    在所述导光板的背离所述发光基板的一侧形成第一凹坑;
    在所述第一凹坑面向所述导光板的界面形成第二填充物层;
    在所述第一凹坑内形成第一填充物。
  13. 如权利要求12所述的制作方法,其中,所述在所述第一凹坑面向所述导光板的界面形成第二填充物层,包括:
    在所述第一凹坑的外围形成多个凹口朝向所述第一凹坑、且与所述第一凹坑连通的第二凹坑;
    在所述第二凹坑内形成所述第二填充物层。
  14. 如权利要求13所述的制作方法,其中,所述在所述导光板背离所述发光基板的一侧形成第一凹坑,包括:
    通过激光打孔工艺,在所述导光板背离所述发光基板的一侧制作圆柱坑;
    通过激光刻蚀工艺,沿着所述圆柱坑的内壁,形成第一凹坑;
    所述在所述第一凹坑的外围形成多个凹口朝向所述第一凹坑、且与所述第一凹坑连通的第二凹坑,包括:
    通过激光打孔工艺,围绕所述第一凹坑形成多个所述第二凹坑。
  15. 如权利要求14所述的制作方法,其中,所述在所述第二凹坑内形成 所述第二填充物层,包括:
    在所述第二凹坑内、所述第一凹坑内填充光学胶;
    刻蚀去除所述第一凹坑内的所述光学胶。
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