WO2019223202A1 - 面光源背光模组及液晶显示面板 - Google Patents

面光源背光模组及液晶显示面板 Download PDF

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Publication number
WO2019223202A1
WO2019223202A1 PCT/CN2018/107139 CN2018107139W WO2019223202A1 WO 2019223202 A1 WO2019223202 A1 WO 2019223202A1 CN 2018107139 W CN2018107139 W CN 2018107139W WO 2019223202 A1 WO2019223202 A1 WO 2019223202A1
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WIPO (PCT)
Prior art keywords
light source
backlight module
mini led
surface light
source backlight
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PCT/CN2018/107139
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English (en)
French (fr)
Inventor
杨勇
查国伟
崔宏青
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武汉华星光电技术有限公司
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Application filed by 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to US16/096,298 priority Critical patent/US20190361294A1/en
Publication of WO2019223202A1 publication Critical patent/WO2019223202A1/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
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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 present invention relates to the field of display technology, and in particular, to a surface light source backlight module and a liquid crystal display panel.
  • liquid crystal display devices Liquid Crystal Display, LCD
  • LCD liquid crystal display devices
  • other flat display devices are widely used in mobile phones, TVs, and other applications due to their advantages such as high picture quality, power saving, thin body, and wide application range.
  • Various consumer electronic products such as personal digital assistants, digital cameras, notebook computers, and desktop computers have become mainstream in display devices.
  • Most of the liquid crystal display devices on the existing market are backlight-type liquid crystal display devices, which include a liquid crystal display panel and a backlight module.
  • the working principle of a liquid crystal display panel is to place liquid crystal molecules in two parallel glass substrates. There are many small vertical and horizontal wires in the middle of the two glass substrates.
  • the liquid crystal molecules are controlled to change direction by turning on or off, and the light of the backlight module is changed.
  • the backlight module is divided into a side-type backlight module and a direct-type backlight module according to the incident position of the light source.
  • the direct type backlight module includes an LED substrate 100, an LED light emitting chip 200, a fluorescent film 300, Since the diffusion sheet 400 and the brightness enhancement film 500 are close to a Lambertian distribution, the central brightness is high, and the surrounding brightness is low. The brightness unevenness is extremely likely to occur during the direct-lit backlight module lighting process.
  • people often use diffusion sheets to mix light or add scattering haze particles to the fluorescent film to mix light, but the addition of the film layer will reduce the overall surface light source's transmittance and affect the overall brightness of the surface light source.
  • the haze particles in the fluorescent film also Cannot achieve better light mixing effect.
  • An object of the present invention is to provide a surface light source backlight module, which has a better light mixing effect of the surface light source, can achieve uniform light emission, and ensures uniformity of the brightness of the surface light source.
  • the present invention provides a surface light source backlight module including a Mini LED substrate, a plurality of Mini LED chips spaced on the Mini LED substrate, and a fluorescent film covering the plurality of Mini LED chips;
  • a plurality of microstructures are provided on a surface of the fluorescent film remote from the plurality of Mini LED chips.
  • the shape of the microstructure is an incomplete sphere that is recessed toward the side of the Mini LED chip.
  • the curvature radius of the incomplete spherical microstructure is 50 ⁇ m to 1000 ⁇ m
  • the distance between the MiniLED chip and the bottom of the microstructure is 150 ⁇ m to 250 ⁇ m
  • the distance between two adjacent microstructures is 700 ⁇ m to 1500 ⁇ m.
  • the length of the microstructure is 100 ⁇ m to 1000 ⁇ m.
  • the flat fluorescent film surface is formed into a microstructure with a light mixing effect by an imprinting or etching process.
  • the microstructure is set corresponding to a Mini LED chip.
  • the plurality of microstructures are respectively located directly above the plurality of Mini LED chips.
  • Each microstructure covers the corresponding Mini LED chip.
  • the Mini LED substrate is a rigid circuit board or a flexible circuit board.
  • the Mini LED chips are evenly arranged in an array on the Mini LED substrate.
  • the surface light source backlight module further includes a diffusion sheet and a brightness enhancement film which are sequentially disposed on the fluorescent film.
  • the present invention also provides a liquid crystal display panel including the above-mentioned surface light source backlight module.
  • a surface light source backlight module provided by the present invention includes a Mini LED substrate, a plurality of Mini LED chips spaced on the Mini LED substrate, and a fluorescent film covering the plurality of Mini LED chips.
  • the plurality of Mini LEDs can achieve a greater angle of light output and improve the uniform light mixing of the surface light source backlight module. It can achieve the purpose of achieving uniform light mixing by saving the optical film, thereby improving the transmittance and brightness of the surface light source, and at the same time conducive to the thin design of the backlight module of the surface light source.
  • a liquid crystal display panel provided by the present invention includes the above-mentioned surface light source backlight module, which is thinner and has better color saturation and brightness.
  • FIG. 1 is a schematic diagram of a conventional LED surface light source
  • FIG. 2 is a schematic diagram of a direct type backlight module of the prior art
  • FIG. 3 is a schematic diagram of a first embodiment of a surface light source backlight module according to the present invention.
  • FIG. 4 is a schematic diagram of a second embodiment of a surface light source backlight module according to the present invention.
  • FIG. 5 is a schematic diagram of a front luminance distribution when a surface of a fluorescent film of a surface light source backlight module is provided with a microstructure
  • FIG. 6 is a schematic diagram of a front luminance distribution when a surface of a fluorescent film of a surface light source backlight module is not provided with a microstructure.
  • FIG. 3 is a schematic diagram of a first embodiment of a surface light source backlight module according to the present invention, including a Mini LED substrate 10, a plurality of Mini LED chips 20 spaced on the Mini LED substrate 10, and covering the data.
  • the fluorescent film 30 of each Mini LED chip 20 is provided with a plurality of microstructures 31 on the surface away from the Mini LED chips 20 to improve the mixing effect of the surface light source backlight module and increase the in-plane brightness. Uniformity. Therefore, compared with the conventional backlight module, it is not necessary to provide an optical film on the fluorescent film 30 to achieve the effect of uniform light emission.
  • FIG. 3 is a schematic diagram of a first embodiment of a surface light source backlight module according to the present invention, including a Mini LED substrate 10, a plurality of Mini LED chips 20 spaced on the Mini LED substrate 10, and covering the data.
  • the fluorescent film 30 of each Mini LED chip 20 is provided with a plurality of microstructures 31 on the surface away from the Mini LED chips 20 to improve the mixing effect of the surface light source
  • FIG. 4 is a schematic diagram of a second embodiment of a surface light source backlight module according to the present invention.
  • An optical film group can be provided on the fluorescent film 30 to further achieve uniform light emission.
  • the sheet group includes a diffusion sheet 40 and a brightness enhancement sheet 50 disposed on the fluorescent film 30 in this order, so that light can be diffused uniformly and concentrated in a positive viewing direction.
  • the shape of the microstructure 31 is an incomplete spherical shape recessed toward the Mini LED chip 20 side, which can change the astigmatism characteristics of the Mini LED chip 20 of the surface light source backlight module and achieve the purpose of uniform light mixing.
  • the shape of the microstructure 31 may also be other shapes with a light mixing effect.
  • the curvature radius R of the incomplete spherical microstructure 31 is 50 ⁇ m to 1000 ⁇ m, and the distance D between the Mini LED chip 20 and the bottom surface of the microstructure 31 is 150 ⁇ m to 250 ⁇ m.
  • the interval G is 700 ⁇ m to 1500 ⁇ m, and the length L of the microstructure 31 is 100 ⁇ m to 1000 ⁇ m.
  • the entire surface of the Mini LED substrate 10 is coated with a fluorescent film 30, and the surface of the flat fluorescent film 30 is embossed into a microstructure with a light mixing effect by using an embossing mold on the fluorescent film 30 through an embossing process.
  • the surface of the flat fluorescent film 30 can also be formed into a microstructure 31 with a light mixing effect by an etching process.
  • the microstructure 31 is provided corresponding to the Mini LED chip 20. Further, the plurality of microstructures 31 are respectively located directly above the plurality of Mini LED chips 20, and each microstructure 31 covers a corresponding Mini LED chip 20.
  • the Mini LED substrate 10 is a printed circuit board (Printed Circuit Board, PCB). Further, the Mini LED substrate 10 is a rigid circuit board or a flexible circuit board. Of course, according to actual use conditions, the Mini LED substrate 10 may also be a soft-hard combined board, which does not affect the implementation of the technical solution of the present invention.
  • a surface of the Mini LED substrate 10 near one of the Mini LED chips 20 is provided with a circuit trace (not shown) and is electrically connected to the circuit trace and corresponds to the Minis respectively.
  • the plurality of pads 13 of the LED chip 20 are each electrically connected to a corresponding Mini LED chip 20 to implement power supply to the Mini LED chip 20.
  • the Mini LED chip 20 has an inverted core structure.
  • Each Mini LED chip 20 includes a P pole 21 and an N pole 22 spaced apart, and each pad 13 includes a first contact point 11 and a second contact spaced apart.
  • Point 12 the P pole 21 and N pole 22 of each Mini LED chip 20 and the first contact point 11 and the second contact point 12 of the corresponding pad 13 are respectively soldered with solder paste to achieve electrical connection, so that the said When the Mini LED chip 20 emits light, the generated heat can be quickly conducted to the Mini LED substrate 10 through the pad 13, has good heat dissipation ability, and can effectively avoid the problem of light quenching.
  • the fluorescent film 30 is a wavelength conversion film layer, which can convert short-wavelength blue light into long-wavelength red light and green light.
  • a surface of the Mini LED substrate 10 near the plurality of Mini LED chips 20 is coated with a high reflectivity material, which is beneficial to improving the utilization rate of light.
  • a high-reflectivity material is coated on an area other than the plurality of pads 13 of the Mini LED substrate 10, that is, the high-reflective material does not cover the plurality of pads 13 of the Mini LED substrate 10 to prevent Mini LED
  • the chip 20 is in poor contact with the corresponding electrically connected pad 13.
  • the Mini LED chips 20 are evenly arranged on the Mini LED substrate 10 in an array arrangement, which is beneficial to achieving uniform light emission of the surface light source backlight module.
  • FIG. 5 is a schematic diagram of the front brightness distribution when the surface of the fluorescent film 30 of the surface light source backlight module is provided with a microstructure 31, and FIG. 6 is a front view of the fluorescent film 30 of the surface light source backlight module when the microstructure 31 is not provided on the surface Schematic diagram of the brightness distribution.
  • the surface light source backlight modules corresponding to Figures 5 and 6 both use the array structure of 5 ⁇ 5 Mini LED light-emitting chips. Among them, the size of the Mini LED is 0620, and the brightness angle of the front LED is 120 °.
  • the incomplete spherical microstructure 31 has a radius of curvature R of 780 ⁇ m, a length L of 600 ⁇ m, a height H of the microstructure 31 of 60 ⁇ m, a distance D between the mini LED and the bottom of the microstructure 31 is 240 ⁇ m, and the distance between two adjacent microstructures 31
  • the pitch G is 1150 ⁇ m.
  • the mean square error of the front luminance of the module is 0.12, and the mean square error of the front luminance of the surface light source backlight module corresponding to FIG. 6 is 0.147, which indicates that the front luminance distribution is more uniform when the fluorescent film 30 has the microstructure 31.
  • the present invention also provides a liquid crystal display panel including the above-mentioned surface light source backlight module.
  • the surface light source backlight module of the present invention includes a Mini LED substrate, a plurality of Mini LED chips spaced on the Mini LED substrate, and a fluorescent film covering the plurality of Mini LED chips.
  • the surface of the fluorescent film away from the Mini LED chips is provided with several microstructures, so that the Mini LEDs can achieve a greater angle of light output, improve the uniformity of light mixing of the surface light source backlight module, and achieve optical savings.
  • the film can achieve the purpose of uniform light mixing, thereby improving the transmittance and brightness of the surface light source, and at the same time conducive to the thin design of the backlight module of the surface light source.
  • the liquid crystal display panel of the present invention includes the above-mentioned surface light source backlight module, which is thinner and has better color saturation and brightness.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

一种面光源背光模组及液晶显示面板。面光源背光模组包括Mini LED基板（10）、间隔设于Mini LED基板（10）上的数个Mini LED芯片（20）以及覆盖数个Mini LED芯片（20）的荧光膜（30），通过在荧光膜（30）远离数个Mini LED芯片（20）一侧的表面设有数个微结构（31），使数个Mini LED可以实现更大角度的出光，改善面光源背光模组的混光均匀性，达到节省光学膜片即可实现均匀混光的目的，从而提高面光源的穿透率和亮度，同时有利于面光源背光模组的薄化设计。

Description

面光源背光模组及液晶显示面板 技术领域
本发明涉及显示技术领域，尤其涉及一种面光源背光模组及液晶显示面板。
背景技术
随着显示技术的发展，液晶显示装置(Liquid Crystal Display，LCD)等平面显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。现有市场上的液晶显示装置大部分为背光型液晶显示装置，其包括液晶显示面板及背光模组(Backlight Module)。液晶显示面板的工作原理是在两片平行的玻璃基板当中放置液晶分子，两片玻璃基板中间有许多垂直和水平的细小电线，通过通电与否来控制液晶分子改变方向，将背光模组的光线折射出来产生画面。由于液晶显示面板本身不发光，需要借由背光模组提供的光源来正常显示影像，因此，背光模组成为液晶显示装置的关键组件之一。背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光模组两种。
如图1和图2所示，现有技术中存在一种直下式背光模组，其采用阵列式LED面光源，该直下式背光模组包括LED基板100、LED发光芯片200、荧光膜300、扩散片400及增亮膜片500，由于LED光接近朗伯型分布，中心亮度较高，周围亮度较低，在直下式背光模组发光过程中极易产生亮度不均的现象。目前人们多采用扩散片混光或者在荧光膜中加入散射雾度粒子混光，但膜层的加入会降低整体面光源的穿透率，影响面光源的整体亮度，荧光膜中雾度粒子也无法达到较好的混光效果。
发明内容
本发明的目的在于提供一种面光源背光模组，其面光源的混光效果较好，能够实现均匀发光，保证面光源的亮度的均一性。
本发明的目的还在于提供一种液晶显示面板，厚度较薄且具有较佳的色彩饱和度。
为实现上述目的，本发明提供了一种面光源背光模组，包括Mini LED基板、间隔设于所述Mini LED基板上的数个Mini LED芯片以及覆盖所述 数个Mini LED芯片的荧光膜；
所述荧光膜远离所述数个Mini LED芯片一侧的表面设有数个微结构。
所述微结构的形状为朝Mini LED芯片一侧凹陷的不完整球状。
所述形状为不完整球状的微结构的曲率半径为50μm～1000μm，所述Mini LED芯片与微结构底面的距离为150μm～250μm，相邻两个微结构之间的间距为700μm～1500μm，所述微结构的长度为100μm～1000μm。
通过压印或蚀刻工艺将平整的荧光膜表面形成具有混光作用的微结构。
所述微结构对应Mini LED芯片设置。
所述数个微结构分别位于所述数个Mini LED芯片正上方。
每一微结构覆盖对应的Mini LED芯片。
所述Mini LED基板为刚性电路板或柔性电路板。
所述数个Mini LED芯片呈阵列排列均匀地设置在所述Mini LED基板上。
所述面光源背光模组还包括依次设于所述荧光膜上的扩散片和增亮膜片。
本发明还提供一种液晶显示面板，包括如上所述的面光源背光模组。
本发明的有益效果：本发明提供的一种面光源背光模组，包括Mini LED基板、间隔设于所述Mini LED基板上的数个Mini LED芯片以及覆盖所述数个Mini LED芯片的荧光膜，通过在所述荧光膜远离所述数个Mini LED芯片一侧的表面设有数个微结构，使所述数个Mini LED可以实现更大角度的出光，改善面光源背光模组的混光均匀性，达到节省光学膜片即可实现均匀混光的目的，从而提高面光源的穿透率和亮度，同时有利于面光源背光模组的薄化设计。本发明提供的一种液晶显示面板，包括上述面光源背光模组，厚度较薄且具有较佳的色彩饱和度和亮度。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为现有技术的LED面光源的示意图；
图2为现有技术的直下式背光模组的示意图；
图3为本发明的面光源背光模组的第一实施例的示意图；
图4为本发明的面光源背光模组的第二实施例的示意图；
图5为面光源背光模组的荧光膜表面设有微结构时的正面亮度分布示意图；
图6为面光源背光模组的荧光膜表面未设置微结构时的正面亮度分布示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图3，为本发明的面光源背光模组的第一实施例的示意图，包括Mini LED基板10、间隔设于所述Mini LED基板10上的数个Mini LED芯片20以及覆盖所述数个Mini LED芯片20的荧光膜30，所述荧光膜30远离所述数个Mini LED芯片20一侧的表面设有数个微结构31以改善面光源背光模组的混光效果，提升面内亮度的均一性。因此相比于传统的背光模组，不需要在荧光膜30上设置光学膜片，即可实现均匀发光的效果。当然，根据实际使用情况，请参阅图4，为本发明的面光源背光模组的第二实施例的示意图，可在荧光膜30上设置光学膜片组以进一步实现均匀发光，所述光学膜片组包括依次设于荧光膜30上的扩散片40和增亮膜片50，使光能够扩散均匀并在正视角方向聚集。
具体地，所述微结构31的形状为朝Mini LED芯片20一侧凹陷的不完整球状，能够改变面光源背光模组的Mini LED芯片20的散光特性，达到均匀混光的目的。当然，根据实际使用情况，所述微结构31形状也可为其他具有混光效果的形状。
具体地，所述形状为不完整球状的微结构31的曲率半径R为50μm～1000μm，所述Mini LED芯片20与微结构31底面的距离D为150μm～250μm，相邻两个微结构31之间的间距G为700μm～1500μm，所述微结构31的长度L为100μm～1000μm。
具体地，在所述Mini LED基板10上整面涂布形成荧光膜30，通过压印工艺在荧光膜30上利用压印模具将平整的荧光膜30表面压印成具有混光作用的微结构31。也可以通过蚀刻工艺将平整的荧光膜30表面形成具有混光作用的微结构31。
具体地，所述微结构31对应Mini LED芯片20设置。进一步地，所述数个微结构31分别位于所述数个Mini LED芯片20正上方，且每一微结构31覆盖对应的Mini LED芯片20。
具体地，所述Mini LED基板10为印刷电路板(Printed Circuit Board， PCB)，进一步地，所述Mini LED基板10为刚性电路板或柔性电路板。当然，根据实际使用情况，所述Mini LED基板10也可为软硬结合板，这并不影响本发明的技术方案的实施。
具体地，所述Mini LED基板10靠近所述数个Mini LED芯片20一侧的表面设有电路走线(未图示)以及与所述电路走线电性连接且分别对应所述数个Mini LED芯片20的数个焊盘13，每一个焊盘13与对应的Mini LED芯片20电性连接，以实现对所述Mini LED芯片20供电。
具体地，所述Mini LED芯片20为倒芯结构，每一个Mini LED芯片20包括间隔设置的P极21与N极22，每一个焊盘13包括间隔设置的第一接触点11与第二接触点12，每一个Mini LED芯片20的P极21与N极22分别与对应的焊盘13的第一接触点11与第二接触点12通过锡膏焊接以实现电性连接，从而使得所述Mini LED芯片20发光时，产生的热量能够迅速通过所述焊盘13传导至所述Mini LED基板10，具有良好的散热能力，能够有效避免光猝灭的问题。
具体地，所述荧光膜30为波长转换膜层，能够实现将短波长蓝光转换为长波长红光和绿光。
具体地，所述Mini LED基板10靠近所述数个Mini LED芯片20一侧的表面涂布有高反射率材料，有利于提高光线的利用率。优选地，在所述Mini LED基板10的数个焊盘13以外的区域涂布高反射率材料，即所述高反射材料不覆盖所述Mini LED基板10的数个焊盘13，防止Mini LED芯片20与对应电性连接的焊盘13接触不良。
具体地，所述数个Mini LED芯片20呈阵列排列均匀地设置在所述Mini LED基板10上，有利于实现面光源背光模组的均匀发光。
图5为所述面光源背光模组的荧光膜30表面设有微结构31时的正面亮度分布示意图，图6为所述面光源背光模组的荧光膜30表面未设置微结构31时的正面亮度分布示意图，图5和图6对应的面光源背光模组均采用5×5的Mini LED发光芯片的阵列结构，其中，Mini LED大小以0620为例，Mini LED正面发光亮度角为120°，形状为不完整球状的微结构31曲率半径R为780μm，长度L为600μm，微结构31高度H为60μm，Mini LED到微结构31底面距离D为240μm，相邻两个微结构31之间的间距G为1150μm。可以看出，图5对应的面光源背光模组的正面亮度均一性明显好于图6对应的面光源背光模组的正面亮度均一性，通过对数据进一步分析，得到图5对应的面光源背光模组的正面亮度均方差为0.12，图6对应的面光源背光模组的正面亮度均方差为0.147，说明荧光膜30有微结构31时正 面亮度分布更加均匀。
基于上述面光源背光模组，本发明还提供一种液晶显示面板，包括如上所述的面光源背光模组。
综上所述，本发明的面光源背光模组包括Mini LED基板、间隔设于所述Mini LED基板上的数个Mini LED芯片以及覆盖所述数个Mini LED芯片的荧光膜，通过在所述荧光膜远离所述数个Mini LED芯片一侧的表面设有数个微结构，使所述数个Mini LED可以实现更大角度的出光，改善面光源背光模组的混光均匀性，达到节省光学膜片即可实现均匀混光的目的，从而提高面光源的穿透率和亮度，同时有利于面光源背光模组的薄化设计。本发明的液晶显示面板包括上述面光源背光模组，厚度较薄且具有较佳的色彩饱和度和亮度。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种面光源背光模组，包括Mini LED基板、间隔设于所述Mini LED基板上的数个Mini LED芯片以及覆盖所述数个Mini LED芯片的荧光膜；
    所述荧光膜远离所述数个Mini LED芯片一侧的表面设有数个微结构。
  2. 如权利要求1所述的面光源背光模组，其中，所述微结构的形状为朝Mini LED芯片一侧凹陷的不完整球状。
  3. 如权利要求2所述的面光源背光模组，其中，所述形状为不完整球状的微结构的曲率半径为50μm～1000μm，所述Mini LED芯片与微结构底面的距离为150μm～250μm，相邻两个微结构之间的间距为700μm～1500μm，所述微结构的长度为100μm～1000μm。
  4. 如权利要求1所述的面光源背光模组，其中，通过压印或蚀刻工艺将平整的荧光膜表面形成具有混光作用的微结构，所述微结构对应Mini LED芯片设置。
  5. 如权利要求4所述的面光源背光模组，其中，所述数个微结构分别位于所述数个Mini LED芯片正上方。
  6. 如权利要求5所述的面光源背光模组，其中，每一微结构覆盖对应的Mini LED芯片。
  7. 如权利要求1所述的面光源背光模组，其中，所述Mini LED基板为刚性电路板或柔性电路板。
  8. 如权利要求1所述的面光源背光模组，其中，所述数个Mini LED芯片呈阵列排列均匀地设置在所述Mini LED基板上。
  9. 如权利要求1所述的面光源背光模组，还包括依次设于所述荧光膜上的扩散片和增亮膜片。
  10. 一种液晶显示面板，包括如权利要求1所述的面光源背光模组。
PCT/CN2018/107139 2018-05-22 2018-09-22 面光源背光模组及液晶显示面板 WO2019223202A1 (zh)

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