WO2018157527A1 - 一种背光模组及液晶显示器 - Google Patents

一种背光模组及液晶显示器 Download PDF

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WO2018157527A1
WO2018157527A1 PCT/CN2017/090636 CN2017090636W WO2018157527A1 WO 2018157527 A1 WO2018157527 A1 WO 2018157527A1 CN 2017090636 W CN2017090636 W CN 2017090636W WO 2018157527 A1 WO2018157527 A1 WO 2018157527A1
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layer
light
quantum dot
light source
backlight module
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English (en)
French (fr)
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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 US15/553,498 priority Critical patent/US10268072B2/en
Publication of WO2018157527A1 publication Critical patent/WO2018157527A1/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
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the invention belongs to the technical field of liquid crystal display, and in particular relates to a novel backlight module and a liquid crystal display.
  • Quantum dots have adjustable luminescence spectrum, narrow full width at half maximum (FWHM), high luminous efficiency, etc., which can be used in LCDs to greatly enhance the display color gamut of LCDs.
  • quantum dots it can be divided into quantum dots containing cadmium materials and quantum dots without cadmium.
  • Cadmium-containing quantum dots have higher luminescence efficiency than quantum dots without cadmium, and the luminescence spectrum FWHM is narrower, so cadmium is contained.
  • Quantum dot displays can be more energy efficient and more vibrant colors.
  • cadmium is a material that is specifically required to limit the concentration in the ROHS (Restriction of Hazardous Substances) standard. Therefore, while using cadmium-containing quantum dot materials to achieve a more vivid and energy-saving display, how to reduce the content of cadmium and achieve ROHS specifications has become an important research direction.
  • the present invention provides a backlight module including: a reflective sheet, a light guide plate, and an optical film group disposed from the bottom to the top;
  • a quantum dot film group is further disposed between the light guide plate and the optical film group;
  • the light source comprises: an excitation light source and a compensation light source; the excitation light source is configured to provide excitation light, and the quantum dot film group is emitted with excitation red light and excitation green light to enter The optical film group; the compensation light source is configured to provide compensation for blue light, and the quantum dot film group emits blue light into the optical film group.
  • the excitation light source is a blue LED or a near ultraviolet LED.
  • the excitation light source has an operating wavelength of 350 to 430 nm.
  • the compensation light source has an operating wavelength of 445 to 470 nm.
  • the quantum dot film group comprises:
  • quantum dot layer connected to the surface of the lower base layer by a bonding layer, the quantum dot layer comprising red quantum dots and/or green quantum dots;
  • a selective transmission layer connected to the surface of the quantum dot layer by a bonding layer, the selective transmission layer comprising a first refractive layer and a second refractive layer periodically alternately stacked; the first refractive layer, the second refractive layer
  • the parameters of the layer satisfy: a(xHLxH)b(yHLyH);
  • a and b represent the integer numbers of the periodic structures of the first refractive layer and the second refractive layer, respectively, and the ranges of a and b are all greater than 5;
  • x and y represent the refractive indices of the first refractive layer and the second refractive layer, respectively. Value;
  • x, y range from 0.01 to 2, x > y;
  • L 1/4 * ⁇ / y, ⁇ represents The center wavelength of the visible light band;
  • the upper base layer is connected to the surface of the selective transmission layer by a bonding layer.
  • the material of the quantum dot layer is at least one selected from the group consisting of CdSe, CdSe/ZnS, CdSe/CdS, CdSe/ZnSe, CuInS, InS, CH3PbX3, and CSPbX3, wherein the X represents Cl, Br or I.
  • the quantum dot layer further comprises a fluorescent material, and the fluorescent material is selected from the group consisting of:
  • A2A'M1-xF6 xMn4+, 0 ⁇ x ⁇ 0.3, wherein x is a molar percentage coefficient of doped Mn4+ ions with respect to M; wherein A is at least one of K, Rb, Cs; A' is Li At least one of Na, K, and Rb; and M is at least one of Al, Sc, V, Ga, Y, In, Gd, Lu, and Bi.
  • the material of the first refractive layer is selected from the group consisting of polyethylene naphthalate or polyethylene terephthalate; the material of the second refractive layer is selected from polymethyl methacrylate or poly Ethylene terephthalate.
  • the material of the lower base layer and the upper base layer is selected from the group consisting of polyethylene terephthalate.
  • the backlight module provided by the present invention is configured by combining a light source of two working wavelengths and a quantum dot film group of a plurality of organic films, on the one hand, the quantum dot film group transmits long-wave blue light, and on the other hand, the quantum dot film group is subjected to short-wavelength.
  • the excitation of blue light emits red and green light, thereby obtaining three-color light that can be mixed into white light.
  • the invention can improve the excitation efficiency of the quantum dots, reduce the amount of quantum dots, reduce the Cd content, and improve the utilization of light energy.
  • the quantum dot layer is between the upper base layer and the lower base layer, the effect of blocking water and oxygen can be achieved, and the quality and stability of the quantum dot layer are well trusted. .
  • the selection of the transmission layer is made of high and low refractive index organic materials, so that the backlight film group can achieve high transmittance (over 95%) for short-wave blue light and near-ultraviolet light without collimating light treatment, for long-wave blue light.
  • Green light and red light have a high reflectivity (more than 95%), which can further improve the utilization of light energy and save costs.
  • FIG. 1 is a schematic structural view of a backlight module according to an embodiment of the present invention.
  • Figure 2 is an enlarged plan view showing the area inside the ring of Figure 1.
  • FIG. 3 is a schematic view showing the working principle of a backlight module according to an embodiment of the present invention.
  • Fig. 5 is a view showing the reflection spectrum of the quantum dot film group of the embodiment of the present invention at an incident angle of 0°.
  • Fig. 6 is a view showing the reflection spectrum of the quantum dot film group of the embodiment of the present invention at an incident angle of 40°.
  • the present embodiment includes at least two light sources, an excitation light source 51 and a compensation light source 52.
  • the excitation light source 51 is configured to provide excitation light, and the quantum dot film group 30 is emitted with excitation red light and excitation green light into the optical film group 40;
  • the compensation light source 52 is configured to provide compensation for blue light,
  • the quantum dot film group 30 emits blue light into the optical film group 40.
  • the compensation light source 52 and the excitation light source 51 are disposed on the left and right sides of the light guide plate 20, corresponding to the light guide plate 20; of course, the positions of the compensation light source 52 and the excitation light source 51 may be reversed, or other positions that can satisfy the purpose of the present invention. the way.
  • the working wavelength of the excitation light source 51 falls within the range of short-wave blue light and near-ultraviolet light.
  • the excitation light source is preferably a blue LED or a near-ultraviolet light LED, and the working wavelength may be 350-470 nm, preferably 350-430 nm.
  • the working wavelength of the compensation light source is long-wave blue light that can penetrate the quantum dot film group 30, preferably 445 to 470 nm.
  • the working wavelength of the compensation light source can also be shifted to the short-wave blue light, that is, the working wavelength of the compensation light source spans two bands, which can provide compensation for the blue light, and can also utilize the short-wave blue light to re-make the quantum dot film group. excitation.
  • the intensity and proportion of the two light sources are determined according to the final screen color of the LCD panel.
  • the quantum dot film group 30 of the present embodiment is formed by laminating a plurality of organic materials, and the quantum dot film group 30 includes four functional layers from bottom to top: a lower base layer 31, a quantum dot layer 32, and selective transmission. Layer 33, upper base layer 34; is connected between each functional layer by a bonding layer 35.
  • the lower base layer 31 located at the lowermost layer is directly in contact with the light guide plate 20, and is prepared by using a polyethylene terephthalate (PET) material having a waterproof oxygen barrier effect; similarly, it is located at the uppermost layer.
  • the upper base layer 34 is in direct contact with the optical film group 40, and is also prepared by using a polyethylene terephthalate (PET) material having a waterproof and oxygen barrier effect.
  • the quantum dot versus wavelength is compared for the absorption and luminescence properties of red light R and green light G.
  • the short green light G has better absorption characteristics and can emit high-intensity red light R and green light G. This property is more conducive to improving light energy utilization and lowering the content of cadmium-containing quantum dots.
  • the quantum dot layer 32 is connected to the surface of the lower base layer 31 through a bonding layer 35, and it is the use of the characteristics of selective absorption of light and cooperation with the above-mentioned light source to achieve the object of the invention.
  • the quantum dot layer 32 reflects near-ultraviolet light, short-wave blue light or part of long-wave blue light, and is simultaneously excited by near-ultraviolet light, short-wave blue light or part of long-wave blue light to excite red quantum dots and green quantum dots in the quantum dot layer. Improve the transmittance of red and green light.
  • the quantum dot layer comprises red quantum dots and/or green quantum dots (not shown) capable of being excited; the material of the quantum dot layer may be selected from the group consisting of CdSe, CdSe/ZnS, CdSe/ At least one of CdS, CdSe/ZnSe, CuInS, InS, CH 3 PbX 3 , CSPbX 3 wherein the X represents Cl, Br or I.
  • a fluorescent material is further included, and the fluorescent material may be selected from:
  • the quantum dot layer has quite a "bullet” and needs to be prepared for a "gun.”
  • the transmission layer 33 is selectively connected to the surface of the quantum dot layer 32 through a bonding layer, which can accurately screen the light, Short-wave blue light, ultraviolet light, only long-wave blue light, red light and green light can be transmitted.
  • the selective transmission layer 33 includes a first refractive layer and a second refractive layer which are periodically alternately stacked.
  • the selective transmission layer 33 is formed by alternately laminating high and low refractive index organic materials.
  • the first refractive layer is a high refractive index material, which may be selected from polyethylene naphthalate (PEN) or polyethylene terephthalate (PET); the second refractive layer is low.
  • the refractive index material may be selected from polymethyl methacrylate (PMMA) or copolymerized with a substance such as ethylene glycol, naphthalene dicarboxylic acid, and decanoate (coPEN).
  • first refractive layer and the second refractive layer satisfy a parameter: a(xHLxH)b(yHLyH);
  • a and b represent the integer number of the periodic structure of the first refractive layer and the second refractive layer, respectively, and the ranges of a and b are all greater than 5;
  • x, y respectively represent the refractive index values of the first refractive layer and the second refractive layer; x and y are in the range of 0.01 to 2, x>y;
  • H 1/4 * ⁇ / x
  • ⁇ represents the center wavelength of the visible light band
  • L 1/4 * ⁇ / y
  • ⁇ represents the center wavelength of the visible light band.
  • ⁇ ranges from 500 to 550 nm in order to allow as much visible light as possible to pass through the selective transmission layer.
  • the excitation light source 51 provides short-wave blue light B1 (for example, a peak wavelength of 350 to 430 nm) into the light guide plate 20, and the short-wave blue light B1 is reflected by the reflection plate 10, and then exits on the surface of the light guide plate 20 and reaches the quantum dot.
  • the short-wave blue light B1 cannot penetrate the quantum dot film group 30 and is reflected back, and the quantum dot material or other color phosphors are excited in the quantum dot layer 32 to emit the excitation red light R and the excitation green light G.
  • R and the excitation green light G are sources of red light and green light that can transmit the selective transmission layer 33 into the optical film group 40.
  • the compensation light source 52 provides long-wave blue light B2 (for example, a peak wavelength of 445 to 470 nm), and a part of the long-wave blue light B2 can enter the optical film group 40 through the selective transmission layer 33 to become blue light.
  • Source thereby achieving white light mixed with the previous excitation red light R and excitation green light G; part of the long-wave blue light B2 can also excite a small portion of the quantum dots and the phosphor to emit the red light R, and the green light G further enhances the red light, The intensity of green light.
  • the working wavelength of the preset excitation light source is short-wave blue light, specifically 380 nm; the working wavelength of the compensation light source is long-wave blue light, specifically 455 nm; the first refractive layer material is PEN, the refractive index is 0.32; the second refractive layer material is PMMA, refraction The ratio is 0.25; the first refractive layer and the second refractive layer are periodically alternately stacked, preferably alternately 20 times, and the material layer of the quantum dot layer 32 generally disposed at a low refractive index is formed, and the high refractive index is thus formed.
  • the structure of the period is: 20 (0.32 HL 0.32H) 20 (0.25 HL 0.25 H), and finally a selective transmission layer 33 having a thickness of about 10 ⁇ m is formed.
  • the quantum dot film group of the present embodiment has good transmission characteristics for long-wave blue light and red-green light (wavelength greater than 440 nm), and the average transmittance is greater than 95%. And in the short-wave blue light (wavelength 360nm ⁇ 430nm) band has a reflectivity greater than 95%.
  • the selective transmission layer of the present embodiment still has excellent blue light transmittance and red-green light reflection characteristics for light incident at a large angle.
  • the quantum dot film group of the present embodiment has good transmission characteristics in the long-wave blue light and red-green light (wavelength greater than 440 nm) band, and the average thereof is shown.
  • the transmittance is greater than 95%
  • the reflectance is greater than 95% in the short-wave blue (wavelength 380 nm) band. Therefore, the quantum dot film group of the embodiment combines the technical solutions of the working light sources of two wavelengths, so that the backlight can achieve high transmittance to short-wave blue light without collimating light treatment, and long-wave blue light and green light.
  • red light has a high reflectivity, which can greatly improve the utilization of light energy and save costs.

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Abstract

一种背光模组，包括：从下至上设置的反射片（10）、导光板（20）和光学膜组（40）；导光板（20）和光学膜组（40）之间还设置一量子点膜组（30）；对应于导光板（20）侧部设置的光源（50），光源（50）包括：激发光源（51）和补偿光源（52）；激发光源（51）用于提供激发光，使量子点膜组（30）出射有激发红光和激发绿光进入光学膜组（40）；补偿光源（52）用于提供补偿蓝光，使量子点膜组（30）出射有蓝光进入光学膜组（40）。该背光模组能够提升量子点的激发效率，降低量子点的用量，降低Cd含量，提升光能利用率。

Description

一种背光模组及液晶显示器 技术领域
本发明属于液晶显示技术领域，具体地讲，涉及一种新型的背光模组及液晶显示器。
背景技术
随着技术的不断进步和人们对生活要求不断提高，人们对液晶显示器的画面品质要求也越来越高。量子点具有发光光谱可调，半高宽(FWHM，full width at half maximum)窄，发光效率高等特点应用于LCD，可大幅提升LCD的显示色域。
对于量子点而言，可分为含镉材料的量子点和不含镉的量子点，含镉量子点由于比不含镉的量子点发光效率更高，且发光光谱FWHM更窄，故含镉量子点的显示器可以更好地具有节能效果和更鲜艳的颜色。但是，由于镉元素是全世界各国ROHS((Restriction of Hazardous Substances))标准中明确要求限制浓度的材料。故，在使用含镉量子点材料实现更鲜艳更节能的显示的同时，如何降低镉元素的含量，达成ROHS的规范，成为重要的研究方向。
发明内容
为了解决上述现有技术存在的问题，本发明提供一种背光模组，包括：从下至上设置的反射片、导光板和光学膜组；以及，
所述导光板和所述光学膜组之间还设置一量子点膜组；
对应于所述导光板侧部设置的光源，所述光源包括：激发光源和补偿光源；所述激发光源用于提供激发光，使所述量子点膜组出射有激发红光和激发绿光进入所述光学膜组；所述补偿光源用于提供补偿蓝光，使所述量子点膜组出射有蓝光进入所述光学膜组。
其中，所述激发光源为蓝光LED或近紫外光LED。
其中，所述激发光源的工作波长为350～430nm。
其中，所述补偿光源的工作波长为445～470nm。
其中，所述量子点膜组包括：
下基层；
通过一连接胶层连接于所述下基层表面的量子点层，所述量子点层包括红色量子点和/或绿色量子点；
通过一连接胶层连接于所述量子点层表面的选择透射层，所述选择透射层包括周期性交替层叠设置的第一折射层和第二折射层；所述第一折射层、第二折射层的参数满足：a(xHLxH)b(yHLyH)；
其中a、b分别表示第一折射层、第二折射层周期结构的整数数目，a、b取值范围均为大于5；x、y分别表示所述第一折射层、第二折射层折射率数值；x、y取值范围均为0.01～2之间，x>y；H＝1/4*λ/x，λ表示可见光波段的中心波长；L＝1/4*λ/y，λ表示可见光波段的中心波长；
上基层，所述上基层通过一连接胶层连接于所述选择透射层表面。
其中，所述量子点层的材质选自CdSe、CdSe/ZnS、CdSe/CdS、CdSe/ZnSe、CuInS、InS、CH3PbX3、CSPbX3中的至少一种，其中所述X代表Cl、Br或I。
其中，所述量子点层中还包括有荧光材料，所述荧光材料选自：
氟化物A2[MF6]:Mn4+，其中A选自Li、Na、K、Rb、Cs、NH4至少一种，M选自Ge、Si、Sn、Ti、Zr和Hf中的至少一种四价元素；
或者，A2A’M1-xF6:xMn4+，0<x≤0.3，其中x为掺杂Mn4+离子相对M所占的摩尔百分比系数；其中A为K、Rb、Cs中的至少一种；A’为Li、Na、K、Rb中的至少一种；M为Al、Sc、V、Ga、Y、In、Gd、Lu、Bi中的至少一种。
其中，所述第一折射层的材质选自聚萘二甲酸乙二醇酯或聚对苯二甲酸乙二醇酯；所述第二折射层的材质选自聚甲基丙烯酸甲酯、或者聚对苯二甲酸乙二醇酯。
其中，所述下基层、所述上基层的材质选自聚对苯二甲酸乙二醇酯。
有益效果：
(1)本发明提供的背光模组，通过两种工作波长的光源和多层有机膜的量子点膜组配合，一方面量子点膜组透射长波蓝光，另一方面，量子点膜组受到短波蓝光的激发，发射红光和绿光，从而获得能混为白光的三色光。本发明能够提升量子点的激发效率，降低量子点的用量，降低Cd含量，提升光能利用率。
(2)具有多层有机膜的量子点膜组中，由于量子点层处于上基层、下基层之间，能够达到隔水隔氧的效果，量子点层的质量和稳定性得到很好的信赖。
(3)此外，选择透射层为采用高低折射率有机材料，使背光膜组无需准直光处理即可实现对短波蓝光和近紫外光很高的透过率(超过95％)，对长波蓝光、绿光和红光具有很高的反射率(超过95％)，进一步可以大幅提升光能利用率和节省成本。
附图说明
通过结合附图进行的以下描述，本发明的实施例的上述和其它方面、特点和优点将变得更加清楚，附图中：
图1是本发明实施例背光模组的结构示意图。
图2是图1中圆环内区域的结构放大图。
图3是本发明实施例背光模组的工作原理示意图。
图4是现有技术中量子点对红色光、绿色光的吸收频谱图(a)和发光频谱图(b)。
图5是本发明实施例量子点膜组在入射角为0°时的反射频谱图。
图6是本发明实施例量子点膜组在入射角为40°时的反射频谱图。
具体实施方式
以下，将参照附图来详细描述本发明的实施例。然而，可以以许多不同的形式来实施本发明，并且本发明不应该被解释为限制于这里阐述的具体实施例。相反，提供这些实施例是为了解释本发明的原理及其实际应用，从而使本领域的其他技术人员能够理解本发明的各种实施例和适合于特定预期应用的各种修改。
结合图1所示，本发明提供的背光模组，包括：从下至上设置的反射片10、导光板20、量子点膜组30和光学膜组40；对应于所述导光板20侧部设置的光源50。
本实施例的至少包括两种光源，激发光源51和补偿光源52。所述激发光源51用于提供激发光，使所述量子点膜组30出射有激发红光和激发绿光进入所述光学膜组40；所述补偿光源52用于提供补偿蓝光，使所述量子点膜组30出射有蓝光进入所述光学膜组40。补偿光源52、激发光源51分设于导光板20的左右两侧，对应于所述导光板20；当然，补偿光源52、激发光源51的位置也可以对调，或者其他能满足本发明目的的摆放方式。
其中，激发光源51的工作波长均落入短波蓝光、近紫外光的波段范围，实际上所述激发光源优选为蓝光LED或近紫外光LED，工作波长可为350～470nm，优选为350～430nm。所述补偿光源的工作波长为可以穿透量子点膜组30的长波蓝光，优选为445～470nm。实际上，补偿光源的工作波长也可以往短波蓝光偏移，即补偿光源的工作波长横跨两个波段，这样可以提供补偿蓝光之余，还可以利用部分的短波蓝光对量子点膜组进行再次激发。
另外，两种光源的强度和比例是根据最后搭配液晶面板的出屏色度再决定的，比如要求出屏后白点色度为x＝0.28±0.030，y＝0.29±0.030；LED的色度需要满足x＝0.26±0.015，y＝0.23±0.015；只需要调配两种光源的强度和红色、绿色荧光粉的比例，达到要求的LED色度范围即可。
结合图2所示，本实施例的量子点膜组30是由多层有机材料层叠而成，量子点膜组30从下至上包括4个功能层：下基层31、量子点层32、选择透射 层33、上基层34；在每个功能层之间通过一连接胶层35相连。
具体地，位于最下层的下基层31与所述导光板20直接接触，采用具有防水隔氧作用的聚对苯二甲酸乙二醇酯(PET)材质制备而成；类似地，位于最上层的上基层34与光学膜组40直接接触，也采用具有防水隔氧作用的聚对苯二甲酸乙二醇酯(PET)材质制备而成。
在现有的研究可发现：由于量子点的吸收特性(如图4的(a)(b)所示)表明，对于红色光R和绿色光G的吸收和发光性能比较，量子点对波长较短的绿色光G的吸收特性更佳，且能发出高强度的红色光R和绿色光G，这种特性更有利于提升光能利用率和降低含镉量子点含量。
本实施例量子点层32通过一连接胶层35连接于所述下基层31的表面，正是利用其对光选择性吸收的特性、并与上述光源相配合工作而达到发明目的的。本实施例量子点层32的作用反射近紫外光、短波蓝光或部分的长波蓝光，同时被反射近紫外光、短波蓝光或部分的长波蓝光激发量子点层中的红色量子点、绿色量子点，提升红光、绿光的透过率。根据该作用设置，所述量子点层包括能够被激发的红色量子点和/或绿色量子点(图中未示出)；所述量子点层的材质可选自CdSe、CdSe/ZnS、CdSe/CdS、CdSe/ZnSe、CuInS、InS、CH3PbX3、CSPbX3中的至少一种，其中所述X代表Cl、Br或I。
为了增强所述量子点层的激发效率，其中还包括有荧光材料，所述荧光材料可选自：
氟化物A2[MF6]:Mn4+，其中A选自Li、Na、K、Rb、Cs、NH4至少一种，M选自Ge、Si、Sn、Ti、Zr和Hf中的至少一种四价元素；
或者，A2A’M1-xF6:xMn4+，0<x≤0.3，其中x为掺杂Mn4+离子相对M所占的摩尔百分比系数；其中A为K、Rb、Cs中的至少一种；A’为Li、Na、K、Rb中的至少一种；M为Al、Sc、V、Ga、Y、In、Gd、Lu、Bi中的至少一种。
具有了量子点层相当具有了“子弹”，还需要准备“枪”。选择透射层33通过一连接胶层连接于所述量子点层32表面，它能够对光进行准确筛选，反 射短波蓝光、紫外光，只有长波蓝光、红光和绿光才可以透射出来。所述选择透射层33包括周期性交替层叠设置的第一折射层和第二折射层。
选择透射层33采用高低折射率有机材料交替层叠形成。例如，所述第一折射层为高折射率材料，可选自聚萘二甲酸乙二醇酯(PEN)或聚对苯二甲酸乙二醇酯(PET)；所述第二折射层采用低折射率材料，可选自聚甲基丙烯酸甲酯(PMMA)、或者由乙二醇、萘二甲酸以及酞酸盐之类的物质共聚而成共聚物(coPEN)。
进一步地，第一折射层和第二折射层满足参数：a(xHLxH)b(yHLyH)；
其中a、b分别表示第一折射层、第二折射层周期结构的整数数目，a、b取值范围均为大于5；
x、y分别表示所述第一折射层、第二折射层折射率数值；x、y取值范围均为0.01～2之间，x>y；
H、L表示该材料层的光学厚度，H＝1/4*λ/x，λ表示可见光波段的中心波长；L＝1/4*λ/y，λ表示可见光波段的中心波长。一般地，λ的取值范围为500～550nm，目的是为了让尽可能多的可见光从选择透射层中透过。
下面结合图3介绍本发明背光模组的工作原理；
结合图2、图3所示，激发光源51提供短波蓝光B1(例如峰值波长350～430nm)进入导光板20中，短波蓝光B1经过反射板10反射后在导光板20表面出射、并到达量子点膜组30，短波蓝光B1不能穿透量子点膜组30而被反射回来，在量子点层32中激发量子点材料或其他颜色荧光粉发出激发红光R和激发绿光G，这些激发红光R和激发绿光G成为能够透射出选择透射层33进入光学膜组40的红光、绿光的来源。进一步地，一部分反射回到导光板20的短波蓝光B1经过反射板10反射继续之前的路线，由于始终不能穿过选择透射层33，而再次反射到量子点层32对量子点材料和荧光粉再次进行激发，直到这一束短波蓝光B1的能量被消耗殆尽。
另一方面，补偿光源52提供长波蓝光B2(例如，峰值波长445～470nm)，一部分的长波蓝光B2能够透过选择透射层33进入光学膜组40中成为蓝光来 源，从而实现与之前的激发红光R、激发绿光G混成白光；一部分长波蓝光B2也可激发小部分的量子点和荧光粉同样发出激发红光R、激发绿光G进一步增强红光、绿光的强度。
例如，在本实施例中：
预设激发光源的工作波长为短波蓝光，具体为380nm；补偿光源的工作波长为长波蓝光，具体为455nm；第一折射层材料为PEN，折射率为0.32；第二折射层材料为PMMA，折射率为0.25；第一折射层、第二折射层周期性交替层叠，优选交替20次，最远离于所述量子点层32的一般设置为低折射率的材料层，如此形成的高低折射率的周期的结构为：20(0.32HL0.32H)20(0.25HL0.25H)，最终形成厚度约为10微米的选择透射层33。
结合图5可看出，当入射角为0度时，本实施例的量子点膜组对于长波蓝光和红绿光(波长大于440nm)波段内具有很好的透射特性，平均透射率大于95％，而在短波蓝光(波长360nm～430nm)波段具有大于95％的反射率。
此外，本实施例的选择透射层对于大角度入射的光线仍然具有很好的蓝光透过性和红绿光反射特性。如图6所示，当入射光为40°时的反特性，看出本实施例的量子点膜组在长波蓝光和红绿光(波长大于440nm)波段内具有很好的透射特性，其平均透射率大于95％，而在短波蓝光(波长380nm)的波段具有大于95％的反射率。由此说明，本实施例的量子点膜组结合两种波长的工作光源的技术方案，可以使背光无需准直光处理即可实现对短波蓝光很高的透过率，对长波蓝光、绿光和红光具有很高的反射率，从而可以大幅提升光能利用率和节省成本。
虽然已经参照特定实施例示出并描述了本发明，但是本领域的技术人员将理解：在不脱离由权利要求及其等同物限定的本发明的精神和范围的情况下，可在此进行形式和细节上的各种变化。

Claims (12)

  1. 一种背光模组，包括：从下至上设置的反射片、导光板和光学膜组，其中，
    所述导光板和所述光学膜组之间还设置一量子点膜组；以及，
    对应于所述导光板侧部设置的光源，所述光源包括：激发光源和补偿光源；所述激发光源用于提供激发光，使所述量子点膜组出射有激发红光和激发绿光进入所述光学膜组；所述补偿光源用于提供补偿蓝光，使所述量子点膜组出射有蓝光进入所述光学膜组。
  2. 根据权利要求1所述背光模组，其中，所述激发光源为蓝光LED或近紫外光LED。
  3. 根据权利要求1所述背光模组，其中，所述激发光源的工作波长为350～430nm。
  4. 根据权利要求2所述背光模组，其中，所述激发光源的工作波长为350～430nm。
  5. 根据权利要求1所述背光模组，其中，所述补偿光源的工作波长为445～470nm。
  6. 根据权利要求1所述背光模组，其中，所述量子点膜组包括：
    下基层；
    通过一连接胶层连接于所述下基层表面的量子点层，所述量子点层包括红色量子点和/或绿色量子点；
    通过一连接胶层连接于所述量子点层表面的选择透射层，所述选择透射层包括周期性交替层叠设置的第一折射层和第二折射层；所述第一折射层、第二折射层的参数满足：a(xHLxH)b(yHLyH)；
    其中a、b分别表示第一折射层、第二折射层周期结构的整数数目，a、b取值范围均为大于5；x、y分别表示所述第一折射层、第二折射层折射率数值；x、y取值范围均为0.01～2之间，x>y；H＝1/4*λ/x，λ表示可见光波段的中心波长；L＝1/4*λ/y，λ表示可见光波段的中心波长；
    上基层，所述上基层通过一连接胶层连接于所述选择透射层表面。
  7. 根据权利要求6所述背光模组，其中，所述量子点层的材质选自CdSe、CdSe/ZnS、CdSe/CdS、CdSe/ZnSe、CuInS、InS、CH3PbX3、CSPbX3中的至少一种，其中所述X代表Cl、Br或I。
  8. 根据权利要求6所述背光模组，其中，所述量子点层中还包括有荧光材料，所述荧光材料选自：
    氟化物A2[MF6]:Mn4+，其中A选自Li、Na、K、Rb、Cs、NH4至少一种，M选自Ge、Si、Sn、Ti、Zr和Hf中的至少一种四价元素；
    或者，A2A’M1-xF6:xMn4+，0<x≤0.3，其中x为掺杂Mn4+离子相对M所占的摩尔百分比系数；其中A为K、Rb、Cs中的至少一种；A’为Li、Na、K、Rb中的至少一种；M为Al、Sc、V、Ga、Y、In、Gd、Lu、Bi中的至少一种。
  9. 根据权利要求7所述背光模组，其中，所述量子点层中还包括有荧光材料，所述荧光材料选自：
    氟化物A2[MF6]:Mn4+，其中A选自Li、Na、K、Rb、Cs、NH4至少一种，M选自Ge、Si、Sn、Ti、Zr和Hf中的至少一种四价元素；
    或者，A2A’M1-xF6:xMn4+，0<x≤0.3，其中x为掺杂Mn4+离子相对M所占的摩尔百分比系数；其中A为K、Rb、Cs中的至少一种；A’为Li、Na、K、Rb中的至少一种；M为Al、Sc、V、Ga、Y、In、Gd、Lu、Bi中的至少一种。
  10. 根据权利要求6所述背光模组，其中，所述第一折射层的材质选自聚萘二甲酸乙二醇酯或聚对苯二甲酸乙二醇酯；所述第二折射层的材质选自聚甲 基丙烯酸甲酯、或者聚对苯二甲酸乙二醇酯。
  11. 根据权利要求6所述背光模组，其中，所述下基层、所述上基层的材质选自聚对苯二甲酸乙二醇酯。
  12. 一种液晶显示器，其中，包括权利要求1所述的背光模组。
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Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10268072B2 (en) 2017-02-28 2019-04-23 Shenzhen China Star Optoelectronics Technology Co., Ltd. Backlight module and liquid crystal display
CN106597753B (zh) * 2017-02-28 2020-04-10 深圳市华星光电技术有限公司 一种背光模组
CN107703674A (zh) * 2017-05-04 2018-02-16 深圳市华星光电技术有限公司 一种用于背光模组的光学膜、背光模组及显示设备
CN107247362A (zh) * 2017-06-19 2017-10-13 深圳市华星光电技术有限公司 量子点光学组件、量子点透镜及其制造方法
CN107424524B (zh) * 2017-07-25 2020-10-02 深圳市华星光电技术有限公司 一种微型led显示面板
KR102433161B1 (ko) * 2017-08-18 2022-08-17 삼성디스플레이 주식회사 광학 부재 및 이를 포함하는 표시 장치
CN107526214A (zh) * 2017-08-21 2017-12-29 深圳市华星光电技术有限公司 荧光粉薄膜组件及其制作方法、背光模组
KR102613049B1 (ko) * 2017-10-10 2023-12-12 삼성전자주식회사 양자점 광변조기 및 이를 포함하는 장치
CN109696719A (zh) * 2017-10-23 2019-04-30 苏州艾科迪新材料科技有限公司 一种反射型近紫外截止量子点膜
CN107894679B (zh) * 2017-12-29 2023-01-10 苏州九骏电子科技有限公司 背光模组及液晶显示装置
CN108957860A (zh) * 2018-08-22 2018-12-07 京东方科技集团股份有限公司 显示装置及其制备方法
CN109814310A (zh) * 2019-03-21 2019-05-28 深圳市华星光电技术有限公司 背光模组及显示装置
CN114576572A (zh) * 2022-03-09 2022-06-03 深圳扑浪量子半导体有限公司 一种健康照明装置
CN114576573A (zh) * 2022-03-09 2022-06-03 深圳扑浪量子半导体有限公司 一种量子点照明装置
CN114545686A (zh) * 2022-03-09 2022-05-27 深圳扑浪量子半导体有限公司 一种量子点显示装置
US12340769B2 (en) 2022-03-31 2025-06-24 Beijing Boe Display Technology Co., Ltd. Backlight module and driving method thereof, and displaying module
CN114755861B (zh) * 2022-06-15 2023-01-06 广东欧迪明光电科技股份有限公司 一种高效率量子点光学基片及其制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101451673A (zh) * 2007-12-07 2009-06-10 索尼株式会社 照明装置、颜色转换元件以及显示装置
CN203069818U (zh) * 2013-02-22 2013-07-17 京东方科技集团股份有限公司 导光板、阵列基板、背光源及液晶模组
CN103278961A (zh) * 2013-04-28 2013-09-04 京东方科技集团股份有限公司 一种液晶显示装置
CN103698937A (zh) * 2013-12-04 2014-04-02 苏州佳世达电通有限公司 显示装置及其背光模组
US20150029439A1 (en) * 2013-07-29 2015-01-29 Samsung Display Co., Ltd. Backlight assembly and liquid crystal display having the same
CN106597753A (zh) * 2017-02-28 2017-04-26 深圳市华星光电技术有限公司 一种背光模组

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103365049B (zh) * 2012-03-27 2015-06-24 台达电子工业股份有限公司 用于一投影装置的光学模块及投影装置
US20140211507A1 (en) * 2013-01-31 2014-07-31 Innolux Corporation Electronic device
JP6153813B2 (ja) * 2013-08-12 2017-06-28 富士フイルム株式会社 液晶表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101451673A (zh) * 2007-12-07 2009-06-10 索尼株式会社 照明装置、颜色转换元件以及显示装置
CN203069818U (zh) * 2013-02-22 2013-07-17 京东方科技集团股份有限公司 导光板、阵列基板、背光源及液晶模组
CN103278961A (zh) * 2013-04-28 2013-09-04 京东方科技集团股份有限公司 一种液晶显示装置
US20150029439A1 (en) * 2013-07-29 2015-01-29 Samsung Display Co., Ltd. Backlight assembly and liquid crystal display having the same
CN103698937A (zh) * 2013-12-04 2014-04-02 苏州佳世达电通有限公司 显示装置及其背光模组
CN106597753A (zh) * 2017-02-28 2017-04-26 深圳市华星光电技术有限公司 一种背光模组

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