WO2019019216A1 - 直下式背光模组以及液晶显示器 - Google Patents

直下式背光模组以及液晶显示器 Download PDF

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Publication number
WO2019019216A1
WO2019019216A1 PCT/CN2017/095885 CN2017095885W WO2019019216A1 WO 2019019216 A1 WO2019019216 A1 WO 2019019216A1 CN 2017095885 W CN2017095885 W CN 2017095885W WO 2019019216 A1 WO2019019216 A1 WO 2019019216A1
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Prior art keywords
micro
backlight module
circuit board
liquid crystal
printed circuit
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English (en)
French (fr)
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程艳
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US15/577,691 priority Critical patent/US10514574B2/en
Publication of WO2019019216A1 publication Critical patent/WO2019019216A1/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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • G02F1/133612—Electrical details
    • 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 technologies, and in particular, to a direct type backlight module, and to a liquid crystal display including the direct type backlight module.
  • LCD Liquid Crystal Display
  • LCD monitors have low power consumption and are characterized by high image quality, small size, and light weight. Therefore, they are favored by everyone and become the mainstream of displays.
  • Most of the liquid crystal displays on the existing market are backlight type liquid crystal displays, including a liquid crystal panel and a backlight module. The liquid crystal panel and the backlight module are oppositely disposed, and the backlight module provides a display light source to the liquid crystal panel to enable the liquid crystal panel to display images.
  • HDR High-Dynamic Range
  • the main board performs brightness analysis on each area according to the brightness algorithm of the image signal in real time, according to The analysis result controls each area in the backlight driving chip to drive the backlight, so as to achieve real-time brightness adjustment of the backlight, which is characterized by brighter and darker areas, thereby improving dynamic contrast and achieving energy saving.
  • the backlight module mainly includes a direct-lit backlight module and a side-in backlight module.
  • the direct-lit backlight module has a one-to-one correspondence between the partition of the LED and the partition of the liquid crystal glass, and the local dimming effect is good, so it becomes the mainstream of the market, especially
  • the spacing of the LED lights is large, the backlight crosstalk between the various partitions is small, and the HDR effect is also good.
  • the spacing of the LED lights in the backlight is small, and an effective multi-partition cannot be achieved, and the crosstalk of light between the partitions is large, and the HDR effect is poor.
  • the present invention provides a direct-lit backlight module, which can effectively reduce crosstalk of light between backlight partitions and improve HDR effect.
  • a direct type backlight module includes a back plate and a light source disposed on the back plate, wherein the light source comprises a printed circuit board and a plurality of micro-LED chips electrically connected to the printed circuit board.
  • the plurality of micro-LED chips are arranged in a matrix array on the printed circuit board, and a light shielding unit is disposed between any two adjacent micro-LED chips; and a backlight driving chip is further connected to the printed circuit board.
  • the backlight driving chip independently drives each of the micro-LED chips.
  • the micro-LED chip is a micro-LED chip emitting a single-color blue light
  • the direct-lit backlight module further includes a quantum dot film layer, and the quantum dot film layer is disposed above the light source, the quantum The dot film layer emits red light and green light under excitation of blue light emitted from the micro-LED chip.
  • the quantum dot film layer has a thickness of 80 to 100 ⁇ m.
  • the height of the light shielding unit protruding from the printed circuit board is not less than a height of the micro-LED chip protruding from the printed circuit board.
  • the material of the light shielding unit is a light shielding glue or a light shielding ink.
  • the spacing between any two adjacent micro-LED chips is 0.15-0.25 mm.
  • the backboard is provided with a heat dissipation plate, and the printed circuit board is disposed on the heat dissipation plate.
  • the plurality of micro-LED chips are divided into a plurality of light control regions on the printed circuit board, and each of the light control regions includes a plurality of the micro-LED chips.
  • a liquid crystal display including a liquid crystal panel and a backlight module.
  • the liquid crystal panel is disposed opposite to the backlight module, and the backlight module provides a display light source to the liquid crystal panel to display an image on the liquid crystal panel.
  • the backlight module is the aforementioned direct type backlight module.
  • the direct-lit backlight module provided by the embodiment of the invention includes a plurality of micro-LED chips arranged in a matrix array on a printed circuit board, and between any two adjacent micro-LED chips A light shielding unit is provided, and the light shielding unit can limit the light exit angle of the micro-LED chip. Therefore, when the partitioning driving of the local dimming is performed, the light between the partitions can be effectively spaced from each other, the crosstalk of the light between the backlight partitions is reduced, and the HDR effect of the display is improved. When the direct type backlight module is applied to a small-sized liquid crystal display, the HDR effect of the display is particularly obvious.
  • FIG. 1 is a schematic structural diagram of a direct type backlight module according to an embodiment of the present invention
  • FIG. 2 is a schematic structural view of a light source in an embodiment of the present invention.
  • FIG. 3 is an exemplary diagram of light emitted by a micro-LED chip in an embodiment of the present invention.
  • FIG. 4 is an exemplary illustration of dividing a light source into a plurality of light control zones in some preferred embodiments of the invention.
  • FIG. 5 is a schematic structural diagram of a liquid crystal display according to an embodiment of the present invention.
  • the direct type backlight module includes a back plate 1 and a light source 2 disposed on the back plate 1.
  • the light source 2 includes a printed circuit board 21 and a plurality of micro-LED (micro light-emitting diode) chips 22 electrically connected to the printed circuit board 21, and the plurality of micro-LED chips 22 are in the printing
  • the circuit board 21 is arranged in a matrix array, and a light shielding unit 23 is disposed between any two adjacent micro-LED chips 22.
  • a backlight driving chip 3 is further connected to the printed circuit board 21, and the backlight driving chip 3 independently drives the opening and closing of each of the micro-LED chips 22.
  • the micro-LED chip 22 is a micro-LED chip that emits a single color blue light.
  • the direct type backlight module further includes a quantum dot film layer 4 , the quantum dot film layer 4 is disposed above the light source 2 , and the quantum dot film layer 4 is at the micro-LED.
  • Chip 22 is issued The blue light is excited to emit red light and green light, and the excited red light and green light are mixed with the blue light emitted by the micro-LED chip 22 to form a white light backlight as a display light source.
  • the light shielding unit 23 can limit the light exit angle of the micro-LED chip 22, so that the light beam 22a emitted by the micro-LED chip 22 is approximately collimated and transmitted to the quantum dot film layer 4, thereby When performing local dimming partition driving, the light between the partitions can be effectively spaced from each other, reducing the crosstalk of light between the backlight partitions.
  • the height of the light-shielding unit 23 protruding from the printed circuit board 21 is set to be not less than that of the micro-LED chip 22 protruding from the printed circuit board 21.
  • the height of the light shielding unit 23 is slightly larger than the height of the micro-LED chip 22.
  • the material of the light shielding unit 23 may be selected as a light shielding glue or a light shielding ink, and the light shielding unit 23 may be formed by a process of screen printing or coating printing.
  • the backlight module applied to the small-sized liquid crystal display has a pitch of 0.15 to 0.25 mm between any two adjacent micro-LED chips 22, and the micro-LED chip arranged in the array A mask is placed over 22, and then the shading unit 23 is prepared by a screen printing or coating printing process in a gap portion between any two adjacent micro-LED chips 22.
  • the thickness of the quantum dot film layer is preferably 80-100 ⁇ m
  • the quantum dot film layer 4 and the light source 2 have a gap 5, and the height of the gap 5 can be set to 0.3- 0.5mm.
  • the quantum dot film layer 4 comprises a transparent encapsulating material and a quantum dot material dispersed in the encapsulating material.
  • Quantum Dots also known as nanocrystals, are nanoparticles composed of II-VI or III-V elements.
  • the quantum dots generally have a particle size between 1 and 20 nm due to electrons.
  • the holes are quantum confined, and the continuous band structure becomes a discrete energy level structure with molecular characteristics, which can emit fluorescence after being excited under photo conditions, for example, red light can be emitted under excitation of blue light. And green light.
  • the luminescence of quantum dots has good fluorescence intensity and stability, and the emission spectrum of quantum dots can be controlled by changing the size of quantum dots.
  • the backboard 1 is provided with a heat dissipation plate 6, and the printed circuit board 21 of the light source 2 is disposed on the heat dissipation plate 6, thereby being more
  • the micro-LED chip 22 of the printed circuit board 21 is well cooled.
  • the direct type backlight module may further include a diffusion sheet disposed above the quantum dot film layer 4 for making the light emitted by the backlight module more uniform.
  • the backlight driving chip 3 can independently drive the opening and closing of each of the micro-LED chips 22, and therefore, when performing partial dimming of the partition driving, it can be a micro
  • the LED chip 22 corresponds to one partition.
  • the plurality of micro-LED chips 22 are divided into a plurality of light control regions 7 on the printed circuit board 21, each of which is
  • the control light zone 7 includes a plurality of the micro-LED chips 22, and all the micro-LED chips 22 in the same light control zone 7 are uniformly controlled by the backlight drive chip 3 to turn on or off and adjust the brightness thereof.
  • the present embodiment further provides a liquid crystal display.
  • the liquid crystal display includes a liquid crystal panel 100 and a backlight module 200.
  • the backlight module 200 adopts a direct type backlight provided by an embodiment of the present invention. Module.
  • the liquid crystal panel 100 is disposed opposite to the backlight module 200.
  • the backlight module 200 provides a display light source to the liquid crystal panel 100 to display the image on the liquid crystal panel 100.
  • the liquid crystal panel 100 includes a lower polarizer 101, an array substrate 102, a filter substrate 103, and an upper polarizer 104, which are sequentially disposed on the backlight module 200, and the array substrate 102 and the filter substrate 103.
  • a liquid crystal layer (not shown) is disposed between them.
  • the direct-lit backlight module provided by the embodiment of the present invention includes a plurality of micro-LED chips arranged in a matrix array on a printed circuit board, and any adjacent two micro-LED chips.
  • the direct type backlight module is applied to a small-sized liquid crystal display, the HDR effect of the display is particularly obvious.

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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)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种直下式背光模组及具有直下式背光模组的液晶显示器，直下式背光模组包括背板（1）以及设置在背板（1）上的光源（2），其中，光源（2）包括印刷电路板（21）以及电性连接在印刷电路板（21）上的多个micro-LED芯片（22），多个micro-LED芯片（22）在印刷电路板（21）上呈矩阵阵列排布，任意相邻的两个micro-LED芯片（22）之间设置有遮光单元（23）；印刷电路板（21）上还连接有背光驱动芯片（3），背光驱动芯片（3）独立地驱动每一个micro-LED芯片（22）。

Description

直下式背光模组以及液晶显示器 技术领域
本发明涉及显示器技术领域,尤其涉及一种直下式背光模组，还涉及包含所述直下式背光模组的液晶显示器。
背景技术
液晶显示器(Liquid Crystal Display，LCD)，为平面超薄的显示设备，它由一定数量的彩色或黑白像素组成，放置于光源或者反射面前方。液晶显示器功耗很低，并且具有高画质、体积小、重量轻的特点，因此倍受大家青睐，成为显示器的主流。现有市场上的液晶显示器大部分为背光型液晶显示器，包括液晶面板及背光模组，液晶面板与背光模组相对设置，背光模组提供显示光源给液晶面板，以使液晶面板显示影像。
近年来，随着高动态范围(High-Dynamic Range，HDR)技术越来越多的应用于数字摄影、电影艺术、电视机等领域。要在液晶显示器中实现HDR技术，对液晶显示器提出了特殊的技术需求，液晶显示器应能够实现分区块控制。液晶显示器的分区越多，local dimming(局部调光)的效果越好，动态对比度越高，画质更佳。而在液晶显示器上引入local dimming技术，通常都会对液晶显示器的背光进行分区处理，几颗灯一区或者一颗灯一区，主板实时根据图像信号的亮度算法对每个区域进行亮度分析，根据分析结果控制背光驱动芯片驱动背光中的每一区，从而达到对背光进行实时亮度调节的目的，表现为亮的区域更亮、暗的地方更暗，从而提高动态对比度并实现节能。
背光模组主要包括直下式背光模组以及侧入式背光模组，直下式背光模组由于LED的分区与液晶玻璃的分区可以一一对应，局部调光的效果好，因此成为市场主流，特别是对于大尺寸的液晶显示器，由于背光的面积较大，LED灯的间距较大，各个分区之间的背光串扰很小，HDR效果也较好。但是对于小尺寸的液晶显示器，背光中LED灯的间距小，无法做到有效的多分区，而且分区之间光线的串扰较大，其HDR效果较差。
发明内容
鉴于现有技术存在的不足，本发明提供了一种直下式背光模组，所述直下式背光模组可以有效地减小背光分区之间光线的串扰，提升HDR效果。
为了达到上述的目的，本发明采用了如下的技术方案：
一种直下式背光模组，包括背板以及设置在所述背板上的光源，其中，所述光源包括印刷电路板以及电性连接在所述印刷电路板上的多个micro-LED芯片，所述多个micro-LED芯片在所述印刷电路板上呈矩阵阵列排布，任意相邻的两个micro-LED芯片之间设置有遮光单元；所述印刷电路板上还连接有背光驱动芯片，所述背光驱动芯片独立地驱动每一个所述micro-LED芯片。
其中，所述micro-LED芯片为发出单色蓝光的micro-LED芯片，所述直下式背光模组还包括量子点薄膜层，所述量子点薄膜层设置在所述光源的上方，所述量子点薄膜层在所述micro-LED芯片发出的蓝光的激发下发出红光和绿光。
其中，所述量子点薄膜层与所述光源之间具有间隙，所述间隙的高度为0.3～0.5mm。
其中，所述量子点薄膜层的厚度为80～100μm。
其中，所述遮光单元从所述印刷电路板上凸起的高度不小于所述micro-LED芯片从所述印刷电路板上凸起的高度。
其中，所述遮光单元的材料为遮光胶或者是遮光油墨。
其中，任意相邻的两个micro-LED芯片之间的间距为0.15～0.25mm。
其中，所述背板上设置有散热板，所述印刷电路板设置在所述散热板上。
其中，所述多个micro-LED芯片在所述印刷电路板上被划分为多个控光区，每一所述控光区包括若干个所述micro-LED芯片。
本发明的另一方面是提供一种液晶显示器，包括液晶面板及背光模组，液晶面板与背光模组相对设置，背光模组提供显示光源给液晶面板，以使液晶面板显示影像，其中，所述背光模组为前述的直下式背光模组。
本发明实施例提供的直下式背光模组，其中的光源包括呈矩阵阵列排布在印刷电路板上的多个micro-LED芯片，任意相邻的两个micro-LED芯片之间设 置有遮光单元，遮光单元可以限制micro-LED芯片的出光角度。由此，在进行局部调光的分区驱动时，分区之间的光线可以有效地相互间隔，减小了背光分区之间光线的串扰，提升了显示器的HDR效果。所述直下式背光模组应用于小尺寸的液晶显示器时，其提升显示器的HDR效果尤为明显。
附图说明
图1是本发明实施例提供的直下式背光模组的结构示意图；
图2是本发明实施例中的光源的结构示意图；
图3是本发明实施例中的micro-LED芯片发出光线的示例性图示；
图4是本发明一些优选的实施例中将光源划分为多个控光区的示例性图示；
图5是本发明实施例提供的液晶显示器的结构示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面结合附图对本发明的具体实施方式进行详细说明。这些优选实施方式的示例在附图中进行了例示。附图中所示和根据附图描述的本发明的实施方式仅仅是示例性的，并且本发明并不限于这些实施方式。
在此，还需要说明的是，为了避免因不必要的细节而模糊了本发明，在附图中仅仅示出了与根据本发明的方案密切相关的结构和/或处理步骤，而省略了与本发明关系不大的其他细节。
本实施例首先提供了一种直下式背光模组，如图1和图2所示，所述直下式背光模组包括背板1以及设置在所述背板1上的光源2。其中，所述光源2包括印刷电路板21以及电性连接在所述印刷电路板21上的多个micro-LED(微型发光二极管)芯片22，所述多个micro-LED芯片22在所述印刷电路板21上呈矩阵阵列排布，任意相邻的两个micro-LED芯片22之间设置有遮光单元23。进一步地，如图1所示，所述印刷电路板21上还连接有背光驱动芯片3，所述背光驱动芯片3独立地驱动每一个所述micro-LED芯片22的开启和关闭。
在本实施例中，所述micro-LED芯片22为发出单色蓝光的micro-LED芯片。如图1所示，所述直下式背光模组还包括量子点薄膜层4，所述量子点薄膜层4设置在所述光源2的上方，所述量子点薄膜层4在所述micro-LED芯片22发出 的蓝光的激发下发出红光和绿光，被激发的红光和绿光与micro-LED芯片22发出的蓝光混合形成白光的背光，作为显示光源。
如图3所示，所述遮光单元23可以限制micro-LED芯片22的出光角度，使得所述micro-LED芯片22发出的光束22a近似为准直光束传输到量子点薄膜层4上，由此，在进行局部调光(local dimming)的分区驱动时，分区之间的光线可以有效地相互间隔，减小了背光分区之间光线的串扰。
具体地，为了达到较好地限制出光角度，所述遮光单元23从所述印刷电路板21上凸起的高度设置为不小于所述micro-LED芯片22从所述印刷电路板21上凸起的高度，最好是所述遮光单元23的高度略大于所述micro-LED芯片22的高度。
具体地，所述遮光单元23的材料可以选择为遮光胶或者是遮光油墨，所述遮光单元23可以是通过丝网印刷或涂布印刷的工艺制备形成。在一些具体的实施例中，应用于小尺寸的液晶显示器的背光模组，任意相邻的两个micro-LED芯片22之间的间距为0.15～0.25mm，在阵列排布的micro-LED芯片22上方设置掩膜版，然后通过丝网印刷或涂布印刷的工艺，在任意相邻的两个micro-LED芯片22之间的间隙部分制备获得遮光单元23。
具体地，参阅图1，所述量子点薄膜层的厚度优选为80～100μm，所述量子点薄膜层4与所述光源2之间具有间隙5，所述间隙5的高度可以设置为0.3～0.5mm。其中，所述量子点薄膜层4包括透明的封装材料和分散在所述封装材料中的量子点材料。量子点(Quantum Dots，QDs)，又可以称纳米晶，是一种由II-VI族或III-V族元素组成的纳米颗粒，量子点的粒径一般介于1～20nm之间，由于电子和空穴被量子限域，连续的能带结构变成具有分子特性的分立能级结构，其可以在光致的条件下受激后可以发射荧光，例如在蓝光的激发下可以发射出红光和绿光。量子点的发光具有良好的荧光强度和稳定性，量子点的发射光谱可以通过改变量子点的尺寸大小来控制。
进一步地，在本实施例中，如图1所示，所述背板1上设置有散热板6，所述光源2中的印刷电路板21设置在所述散热板6上，由此可以更好地对印刷电路板21的micro-LED芯片22进行散热。在另外的一些实施例中，所述直下式背光模组还可以包括扩散片，所述扩散片设置在所述量子点薄膜层4上方，用于使得背光模组发射出的光线更加均匀。
本实施例中，如前所述，所述背光驱动芯片3可以独立地驱动每一个所述micro-LED芯片22的开启和关闭，因此，在进行局部调光的分区驱动时，可以是一个micro-LED芯片22对应一个分区。为了降低驱动的难度，在另外的一些实施例中，如图4所示，所述多个micro-LED芯片22在所述印刷电路板21上被划分为多个控光区7，每一所述控光区7包括若干个所述micro-LED芯片22，在同一个控光区7中的所有micro-LED芯片22，由背光驱动芯片3统一控制其开启或关闭及其亮度的调整。
本实施例还提供了一种液晶显示器，如图5所示，所述液晶显示器包括液晶面板100及背光模组200，所述背光模组200采用的是本发明实施例所提供的直下式背光模组。所述液晶面板100与所述背光模组200相对设置，所述背光模组200提供显示光源给所述液晶面板100，以使所述液晶面板100显示影像。其中，所述液晶面板100包括依次设置在所述背光模组200上的下偏光片101、阵列基板102、滤光基板103和上偏光片104，所述阵列基板102和所述滤光基板103之间设置有液晶层(图中未示出)。
综上所述，本发明实施例提供的直下式背光模组，其中的光源包括呈矩阵阵列排布在印刷电路板上的多个micro-LED芯片，任意相邻的两个micro-LED芯片之间设置有遮光单元，遮光单元可以限制micro-LED芯片的出光角度。由此，在进行局部调光的分区驱动时，分区之间的光线可以有效地相互间隔，减小了背光分区之间光线的串扰，提升了显示器的HDR效果。所述直下式背光模组应用于小尺寸的液晶显示器时，其提升显示器的HDR效果尤为明显。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (18)

  1. 一种直下式背光模组，包括背板以及设置在所述背板上的光源，其中，所述光源包括印刷电路板以及电性连接在所述印刷电路板上的多个micro-LED芯片，所述多个micro-LED芯片在所述印刷电路板上呈矩阵阵列排布，任意相邻的两个micro-LED芯片之间设置有遮光单元；所述印刷电路板上还连接有背光驱动芯片，所述背光驱动芯片独立地驱动每一个所述micro-LED芯片。
  2. 根据权利要求1所述的直下式背光模组，其中，所述micro-LED芯片为发出单色蓝光的micro-LED芯片，所述直下式背光模组还包括量子点薄膜层，所述量子点薄膜层设置在所述光源的上方，所述量子点薄膜层在所述micro-LED芯片发出的蓝光的激发下发出红光和绿光。
  3. 根据权利要求2所述的直下式背光模组，其中，所述量子点薄膜层与所述光源之间具有间隙，所述间隙的高度为0.3～0.5mm。
  4. 根据权利要求2所述的直下式背光模组，其中，所述量子点薄膜层的厚度为80～100μm。
  5. 根据权利要求1所述的直下式背光模组，其中，所述遮光单元从所述印刷电路板上凸起的高度不小于所述micro-LED芯片从所述印刷电路板上凸起的高度。
  6. 根据权利要求5所述的直下式背光模组，其中，所述遮光单元的材料为遮光胶或者是遮光油墨。
  7. 根据权利要求1所述的直下式背光模组，其中，任意相邻的两个micro-LED芯片之间的间距为0.15～0.25mm。
  8. 根据权利要求1所述的直下式背光模组，其中，所述背板上设置有散热板，所述印刷电路板设置在所述散热板上。
  9. 根据权利要求1所述的直下式背光模组，其中，所述多个micro-LED芯片在所述印刷电路板上被划分为多个控光区，每一所述控光区包括若干个所述micro-LED芯片。
  10. 一种液晶显示器，包括液晶面板及背光模组，液晶面板与背光模组相对设置，背光模组提供显示光源给液晶面板，以使液晶面板显示影像，其中， 所述背光模组为直下式背光模组，所述直下式背光模组包括背板以及设置在所述背板上的光源，所述光源包括印刷电路板以及电性连接在所述印刷电路板上的多个micro-LED芯片，所述多个micro-LED芯片在所述印刷电路板上呈矩阵阵列排布，任意相邻的两个micro-LED芯片之间设置有遮光单元；所述印刷电路板上还连接有背光驱动芯片，所述背光驱动芯片独立地驱动每一个所述micro-LED芯片。
  11. 根据权利要求10所述的液晶显示器，其中，所述micro-LED芯片为发出单色蓝光的micro-LED芯片，所述直下式背光模组还包括量子点薄膜层，所述量子点薄膜层设置在所述光源的上方，所述量子点薄膜层在所述micro-LED芯片发出的蓝光的激发下发出红光和绿光。
  12. 根据权利要求11所述的液晶显示器，其中，所述量子点薄膜层与所述光源之间具有间隙，所述间隙的高度为0.3～0.5mm。
  13. 根据权利要求11所述的液晶显示器，其中，所述量子点薄膜层的厚度为80～100μm。
  14. 根据权利要求10所述的液晶显示器，其中，所述遮光单元从所述印刷电路板上凸起的高度不小于所述micro-LED芯片从所述印刷电路板上凸起的高度。
  15. 根据权利要求14所述的液晶显示器，其中，所述遮光单元的材料为遮光胶或者是遮光油墨。
  16. 根据权利要求10所述的液晶显示器，其中，任意相邻的两个micro-LED芯片之间的间距为0.15～0.25mm。
  17. 根据权利要求10所述的液晶显示器，其中，所述背板上设置有散热板，所述印刷电路板设置在所述散热板上。
  18. 根据权利要求10所述的液晶显示器，其中，所述多个micro-LED芯片在所述印刷电路板上被划分为多个控光区，每一所述控光区包括若干个所述micro-LED芯片。
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