CN106090728A - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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CN106090728A
CN106090728A CN201610439638.4A CN201610439638A CN106090728A CN 106090728 A CN106090728 A CN 106090728A CN 201610439638 A CN201610439638 A CN 201610439638A CN 106090728 A CN106090728 A CN 106090728A
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led
backlight module
lamp bar
backboard
led lamp
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CN106090728B (zh
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胡楠楠
王鑫
杨凡
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to US15/531,232 priority patent/US10260713B2/en
Priority to PCT/CN2016/106353 priority patent/WO2017215193A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/02Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
    • 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
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133605Direct backlight including specially adapted reflectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00Lighting devices or systems using a string or strip of light sources
    • F21S4/20Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/08Refractors for light sources producing an asymmetric light distribution
    • 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
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133603Direct backlight with LEDs
    • 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
    • G02F1/1336Illuminating devices
    • G02F1/133626Illuminating devices providing two modes of illumination, e.g. day-night
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/028Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/068Adjustment of display parameters for control of viewing angle adjustment

Abstract

本发明公开了一种背光模组及显示装置,以使显示装置的视角可调,从而使显示装置可以应用在多种场合,提升其使用的灵活性。背光模组包括具有容置空间的背板、位于背板的容置空间内的多个光源组件,位于多个光源组件前侧的光学膜片,其中:背板的内底具有多个散射凹坑结构;光源组件包括LED灯条,LED灯条的LED的发光角度小于40度,LED灯条能够转动至LED朝向背板内底及转动至LED朝向光学膜片。

Description

背光模组及显示装置
技术领域
本发明涉及显示技术领域,特别是涉及一种背光模组及显示装置。
背景技术
随着科技的进步,电脑已成为人们工作生活的必需品。人们在办公、出差或者它空闲时间,经常会使用电脑进行阅读、学习或者进行信息交流。然而,由于周围人的存在,自己电脑上显示的内容可能会被窥视到,从而造成信息泄露,隐私被他人获知,防窥安全性较差。
现有的防窥显示产品,其通过在显示装置上设置防窥片来减小显示视角,从而保护用户的隐私。其缺陷在于,这个防窥效果是不可逆的,当用户想要同他人一起分享视频或资料时,较窄的视角会使一部分人无法正常观看,从而给用户带来极大的不便。
发明内容
本发明实施例提供一种背光模组及显示装置,以使显示装置的视角可调,从而使显示装置可以应用在多种场合,提升其使用的灵活性。
本发明实施例提供了一种背光模组,包括具有容置空间的背板、位于背板的容置空间内的多个光源组件,以及位于所述多个光源组件前侧的光学膜片,其中:
所述背板的内底具有多个散射凹坑结构;
所述光源组件包括LED(Light Emitting Diode,下文简称LED)灯条,所述LED灯条的LED的发光角度小于40度,所述LED灯条能够转动至LED朝向背板内底及转动至LED朝向光学膜片。
本发明实施例的背光模组应用于显示装置,可以使显示装置在宽视角和窄视角显示功能之间进行切换。具体的:驱动LED灯条转动至LED朝向光学膜片时,LED的出射光以较小的发光角度从光学膜片射出,从而使显示装置工作于窄视角,可以实现防窥,有效保护个人信息和隐私;驱动LED灯条转动至LED朝向背板内底时,LED的出射光被散射凹坑结构打散后以较大的出射角度从光学膜片射出,从而使显示装置工作于宽视角,用户可以与多人分享显示画面内容。因此,采用该背光模组的显示装置可以应用在多种场合,使用的灵活性大大提升。
较佳的,所述光源组件还包括固定支架和驱动装置,所述固定支架与背板连接,所述LED灯条枢装于固定支架,所述驱动装置用于驱动LED灯条转动。
优选的,所述LED包括发光芯片和灯罩,所述灯罩将LED的发光角度调制为25度~35度。通过调整灯罩的结构,可以调整LED的发光角度,从而可以精确控制显示装置的视角。
可选的,所述LED灯条的每个LED对应多个散射凹坑结构。当LED朝向背板内底时,LED的出射光被多个散射凹坑结构打散,然后以较大的出射角度从光学膜片射出。
优选的,所述LED灯条的每个LED对应一个散射凹坑结构,所述散射凹坑结构的表面具有光学网点。当LED朝向背板内底时,LED的出射光被对应散射凹坑结构表面的光学网点打散,然后以较大的出射角度从光学膜片射出。采用该设计,散射凹坑结构的尺寸相比前一技术方案可以设计的较大,而背板一般采用金属材质,因此有利于降低工艺难度,提高制造精度,并降低制造成本。
较佳的,所述背板内底的平坦区域设置有反射层。反射层可以将光线反射,从而提高背光模组的光利用率,提升显示装置的显示品质。
优选的,所述散射凹坑结构为弧形散射凹坑结构。
较佳的,所述驱动装置为电机,所述LED灯条的一端枢装于固定支架,另一端与电机的输出轴连接。
较佳的,所述电机为往复电机,输出轴的转动行程为180度。
可选的,背光模组还包括位于所述多个光源组件与光学膜片之间的支撑板。
可选的,所述支撑板包括聚甲基丙烯酸甲酯支撑板或聚碳酸酯支撑板。
本发明实施例还提供一种显示装置,包括前述任一技术方案所述的背光模组。该显示装置能够在宽视角和窄视角显示功能之间进行切换,从而可以应用在多种场合,使用的灵活性大大提升。
附图说明
图1a为本发明一实施例背光模组的截面结构示意图(窄视角状态);
图1b为本发明一实施例背光模组的截面结构示意图(宽视角状态);
图2为本发明一实施例中光源组件结构示意图;
图3为本发明一实施例中背板和LED灯条俯视图(宽视角状态);
图4为本发明另一实施例中背板和LED灯条俯视图(宽视角状态);
图5为本发明另一实施例背光模组的截面结构示意图(宽视角状态);
图6为本发明一实施例中LED结构示意图。
附图标记:
1-背板;
2-光源组件;
3-支撑板;
4-光学膜片;
10-散射凹坑结构;
21-固定支架;
22-LED灯条;
23-驱动装置;
220-LED;
220a-发光芯片;
220b-灯罩;
11-反射层;
12-背板内底;
13-光学网点。
具体实施方式
为使显示装置的视角可调,从而使显示装置可以应用在多种场合,提升其使用的灵活性,本发明实施例提供了一种背光模组及显示装置。为使本发明的目的、技术方案和优点更加清楚,以下举实施例对本发明作进一步详细说明。
如图1a、图1b、图2和图3所示,本发明一实施例提供的背光模组,包括具有容置空间的背板1、位于背板1的容置空间内的多个光源组件2,以及位于多个光源组件2前侧的光学膜片4,其中:
背板1的内底具有多个散射凹坑结构10;
光源组件2包括LED灯条22,LED灯条22的LED 220的发光角度小于40度,LED灯条22能够转动至LED 220朝向背板内底12及转动至LED 220朝向光学膜片4。
具体的,光源组件2还包括固定支架21和驱动装置23,固定支架21与背板1连接,LED灯条22枢装于固定支架21,驱动装置23用于驱动LED灯条22转动。此外,背光模组还可以在多个光源组件2与光学膜片4之间设置支撑板3。
目前,背光模组普遍采用的LED的发光角度为115~120度,而在本发明实施例中,为实现显示装置的视角切换,LED灯条22的LED 220的发光角度应小于40度,以近似于准直光为最佳。
本发明实施例的背光模组应用于显示装置,可以使显示装置在宽视角和窄视角显示功能之间进行切换。如图1a和图1b所示,具体的:驱动LED灯条22转动至LED 220朝向支撑板3时,LED 220的出射光以较小的发光角度从支撑板3和光学膜片4射出,从而使显示装置工作于窄视角,可以实现防窥,有效保护个人信息和隐私;驱动LED灯条22转动至LED 220朝向背板内底12时,LED 220的出射光被散射凹坑结构10打散后以较大的出射角度从支撑板3和光学膜片4射出,从而使显示装置工作于宽视角,用户可以与多人分享显示画面内容。因此,采用该背光模组的显示装置可以应用在多种场合,使用的灵活性大大提升。
如图6所示,LED 220包括发光芯片220a和灯罩220b,灯罩220b将LED220的发光角度调制为25度~35度。通过调整灯罩220b的结构,可以调整LED220的发光角度,从而可以精确控制显示装置的视角。
图1a、图1b、和图3所示为本发明的优选实施例,LED灯条22的每个LED 220对应一个散射凹坑结构10,即LED 220正对散射凹坑结构10的中心。LED 220可以与背板内底12的平坦区域(即背板内底12除散射凹坑结构10之外的区域)相平或者略高于背板内底12的平坦区域,其尺寸应小于散射凹坑结构10。此外,如图3所示,散射凹坑结构10的表面设置有光学网点13。当LED 220朝向背板内底12时,LED 220的出射光被对应散射凹坑结构10表面的光学网点13打散,然后以较大的出射角度从支撑板3和光学膜片4射出。由于背板1一般采用金属材质,采用该设计,散射凹坑结构10的尺寸可以设计得较大,从而有利于降低工艺难度,提高制造精度,并降低制造成本。如图1a和图1b所示,可以在背板内底12的平坦区域设置反射层11,例如白色反射层或银反射层,反射层11可以将光线反射,从而提高背光模组的光利用率,提升显示装置的显示品质。
如图4和图5所示,该实施例中,LED灯条22的每个LED 220对应多个散射凹坑结构10。多个散射凹坑结构10可以起到类似网点的作用,当LED 220朝向背板内底12时,LED 220的出射光被多个散射凹坑结构10打散,然后以较大的出射角度从支撑板3和光学膜片4射出。
散射凹坑结构10的具体形状不限,能够起到将光线打散的作用即可。优选的,如图1a所示,散射凹坑结构10为弧形散射凹坑结构。
驱动装置23的具体类型不限,例如可以采用驱动马达或者微型电机等。如图2所示,在本发明的该优选实施例中,驱动装置23为电机,LED灯条22的一端枢装于固定支架21,另一端与电机的输出轴连接。较佳的,电机采用往复电机,输出轴的转动行程为180度,采用该方案,电机的控制逻辑简单,可以精确控制LED灯条22的转动位置。
支撑板3可以采用聚甲基丙烯酸甲酯(polymethylmethacrylate,简称PMMA)支撑板,或者聚碳酸酯(Polycarbonate,简称PC)支撑板。支撑板3可以对光学膜片起到支撑作用。
本发明实施例还提供一种显示装置,包括前述任一技术方案的背光模组。该显示装置能够在宽视角和窄视角显示功能之间进行切换,从而可以应用在多种场合,使用的灵活性大大提升。显示装置的具体类型不限,例如可以为电视机、显示器、平板电脑等等。
显然,本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。

Claims (12)

1.一种背光模组,其特征在于,包括具有容置空间的背板、位于背板的容置空间内的多个光源组件,以及位于所述多个光源组件前侧的光学膜片,其中:
所述背板的内底具有多个散射凹坑结构;
所述光源组件包括LED灯条,所述LED灯条的LED的发光角度小于40度,所述LED灯条能够转动至LED朝向背板内底及转动至LED朝向光学膜片。
2.如权利要求1所述的背光模组,其特征在于,所述光源组件还包括固定支架和驱动装置,所述固定支架与背板连接,所述LED灯条枢装于固定支架,所述驱动装置用于驱动LED灯条转动。
3.如权利要求1所述的背光模组,其特征在于,所述LED包括发光芯片和灯罩,所述灯罩将LED的发光角度调制为25度~35度。
4.如权利要求1所述的背光模组,其特征在于,所述LED灯条的每个LED对应多个散射凹坑结构。
5.如权利要求1所述的背光模组,其特征在于,所述LED灯条的每个LED对应一个散射凹坑结构,所述散射凹坑结构的表面具有光学网点。
6.如权利要求5所述的背光模组,其特征在于,所述背板内底的平坦区域设置有反射层。
7.如权利要求1所述的背光模组,其特征在于,所述散射凹坑结构为弧形散射凹坑结构。
8.如权利要求1所述的背光模组,其特征在于,所述驱动装置为电机,所述LED灯条的一端枢装于固定支架,另一端与电机的输出轴连接。
9.如权利要求8所述的背光模组,其特征在于,所述电机为往复电机,输出轴的转动行程为180度。
10.如权利要求1~9任一项所述的背光模组,其特征在于,还包括位于所述多个光源组件与光学膜片之间的支撑板。
11.如权利要求10所述的背光模组,其特征在于,所述支撑板包括聚甲基丙烯酸甲酯支撑板或聚碳酸酯支撑板。
12.一种显示装置,其特征在于,包括如权利要求1~11任一项所述的背光模组。
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