CN110262116A - 偏光模块及其操作方法 - Google Patents

偏光模块及其操作方法 Download PDF

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CN110262116A
CN110262116A CN201910561200.7A CN201910561200A CN110262116A CN 110262116 A CN110262116 A CN 110262116A CN 201910561200 A CN201910561200 A CN 201910561200A CN 110262116 A CN110262116 A CN 110262116A
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polaroid
liquid crystal
crystal layer
double
sided reflecting
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杨玄菱
陈冠宇
李朝暐
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AU Optronics Corp
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AU Optronics Corp
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    • 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
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    • 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
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    • GPHYSICS
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    • 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
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    • 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
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    • G02F1/1333Constructional arrangements; Manufacturing methods
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    • 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
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Abstract

本发明提供一种偏光模块及其操作方法。偏光模块包括双面反射式偏光片、第一液晶层、第二液晶层、第一偏光片和第二偏光片。双面反射式偏光片具有相对的第一表面和第二表面。第一液晶层和第二液晶层分别设置于第一表面上和第二表面上。第一偏光片和第二偏光片分别设置于第一液晶层上和第二液晶层上。

Description

偏光模块及其操作方法
技术领域
本发明是有关于一种光学模块及其操作方法,且特别是有关于一种偏光模块及其操作方法。
背景技术
一般而言,液晶显示器可以大致上区分为穿透式液晶显示器、反射式液晶显示器与半穿透半反射式液晶显示器。随着显示器的应用领域日趋广泛,透明显示器已经逐渐被开发。透明显示器(transparent display)是指显示器本身具有一定程度的穿透性,能够清楚地显示面板后方的背景。透明显示器适用于建筑物窗户、汽车车窗与商店橱窗等多种应用,除了原有的透明显示功能以外,还具有未来可能作为资讯显示器的发展潜力,因而备受市场关注。
然而,利用透明显示器的透明特性虽可发展出许多旧有非透明显示器所不能做到的应用方式,但亦有相对的限制。举例而言,透明显示技术虽可达到透明显示的功能,但无法在透明模式及镜面模式之间切换;而应用高分子分散型液晶(polymer dispersedliquid crystal,PDLC)的透明显示技术虽可达到防窥的效果但遮光及隔热效率不佳。
发明内容
本发明提供一种偏光模块及其操作方法,其可实现镜面模式和透明模式之间的切换。
本发明一实施例提供一种偏光模块,其包括双面反射式偏光片、第一液晶层、第二液晶层、第一偏光片和第二偏光片。双面反射式偏光片具有相对的第一表面和第二表面。第一液晶层和第二液晶层分别设置于第一表面上和第二表面上。第一偏光片和第二偏光片分别设置于第一液晶层上和第二液晶层上。
本发明一实施例提供一种偏光模块的操作方法,其包括以下步骤:提供如上所述的偏光模块;以及使偏光模块执行双镜面模式、单镜面模式或透明模式。在光线被双面反射式偏光片反射而通过第一偏光片和第二偏光片的情况下,偏光模块为双镜面模式。在光线被双面反射式偏光片反射而只通过第一偏光片和第二偏光片中的其中一者的情况下,偏光模块为单镜面模式。在光线穿透双面反射式偏光片的情况下,偏光模块为透明模式。
基于上述,在本发明的偏光模块包括如上所配置的双面反射式偏光片、第一液晶层、第二液晶层、第一偏光片和第二偏光片的情况下,其可藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式(双镜面模式和单镜面模式)和透明模式之间的切换。
以下结合附图和具体实施例对本发明进行详细描述,但不作为对本发明的限定。
附图说明
图1为本发明一实施例的偏光模块的剖面示意图。
图2A至图2C为本发明一实施例的偏光模块藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式和透明模式之间的切换的示意图。
图3A至图3D为本发明另一实施例的偏光模块藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式和透明模式之间的切换的示意图。
图4A至图4C为本发明又一实施例的偏光模块藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式和透明模式之间的切换的示意图。
图5为本发明一实施例的偏光模块的剖面示意图。
图6为本发明另一实施例的偏光模块的剖面示意图。
图7为本发明又一实施例的偏光模块的剖面示意图。
图8为本发明再一实施例的偏光模块的剖面示意图。
其中,附图标记
100、200、300:偏光模块
RP:双面反射式偏光片
LC1:第一液晶层
LC2:第二液晶层
P1:第一偏光片
P2:第二偏光片
S1:第一表面
S2:第二表面
F1、F2:光线
F1’、F2’:箭头
SUB1:第一基板
SUB2:第二基板
SUB’:基板
AG:气隙
LS:侧光源
LG:导光板
具体实施方式
以下将参照本实施例的图式以更全面地阐述本发明。然而,本发明亦可以各种不同的形式体现,而不应限于本文中所述的实施例。图式中的层与区域的厚度会为了清楚起见而放大。相同或相似的参考号码表示相同或相似的元件,以下段落将不再一一赘述。另外,实施例中所提到的方向用语,例如:上、下、左、右、前或后等,仅是参考附加图式的方向。因此,使用的方向用语是用来说明并非用来限制本发明。
图1为本发明一实施例的偏光模块的剖面示意图。图2A至图2C为本发明一实施例的偏光模块藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式和透明模式之间的切换的示意图。图3A至图3D为本发明另一实施例的偏光模块藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式和透明模式之间的切换的示意图。图4A至图4C为本发明又一实施例的偏光模块藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式和透明模式之间的切换的示意图。
请参照图1,偏光模块100包括双面反射式偏光片RP、第一液晶层LC1、第二液晶层LC2、第一偏光片P1和第二偏光片P2。在本实施例中,由于偏光模块100可在镜面模式(包括双镜面模式和单镜面模式)和透明模式之间切换,故可应用于透明显示器、智慧窗或智慧墙面等,以进一步提升其应用性。
双面反射式偏光片RP具有相对的第一表面S1和第二表面S2。举例而言,如图1所示,第一表面S1可为双面反射式偏光片RP的下表面;而第二表面S2可为双面反射式偏光片RP的上表面,但本发明不以此为限。在本实施例中,双面反射式偏光片RP可具有反射轴,以反射平行于此反射轴的偏光。举例而言,如图2A所示,入射至双面反射式偏光片RP的相对两侧的光线F1、F2的偏振方向在平行于双面反射式偏光片RP的反射轴的情况下,光线F1、F2会被双面反射式偏光片RP反射。双面反射式偏光片RP可具有穿透轴,以使平行于此穿透轴的偏光穿透双面反射式偏光片RP。举例而言,如图2C所示,入射至双面反射式偏光片RP的相对两侧的光线F1、F2的偏振方向在平行于双面反射式偏光片RP的穿透轴的情况下,光线F1、F2会穿过双面反射式偏光片RP。在本实施例中,双面反射式偏光片RP的反射轴与穿透轴可彼此正交,也就是说,在光线F1、F2的偏振方向在垂直于双面反射式偏光片RP的反射轴的情况下,光线F1、F2可穿透双面反射式偏光片RP。在本实施例中,双面反射式偏光片RP可为反射式偏光镜RPM或是线栅偏光片(wire grid polarizer,WGP)。
第一液晶层LC1和第二液晶层LC2分别设置于双面反射式偏光片RP的第一表面S1和第二表面S2上。在一些实施例中,第一液晶层LC1和第二液晶层LC2可包括可被水平电场转动或切换(in-plane-switching)的液晶分子或者是可被垂直电场转动或切换(verticalswitching)的液晶分子,但本发明不以此为限。在其他实施例中,第一液晶层LC1和第二液晶层LC2可包括高分子分散型液晶(PDLC)或其他可适用的液晶。
第一偏光片P1和第二偏光片P2分别设置于第一液晶层LC1和第二液晶层LC2上。在本实施例中,第一偏光片P1和第二偏光片P2可具有吸收轴,以吸收平行此吸收轴的偏光。第一偏光片P1和第二偏光片P2可具有穿透轴,以使平行于此穿透轴的偏光穿透第一偏光片P1和第二偏光片P2。在本实施例中,第一偏光片P1和第二偏光片P2的吸收轴和穿透轴可彼此正交,也就是说,在光线F1、F2的偏振方向在垂直于第一偏光片P1或第二偏光片P2的吸收轴的情况下,光线F1、F2可穿透第一偏光片P1或第二偏光片P2。
基于上述,在偏光模块100包括如上所配置的双面反射式偏光片RP、第一液晶层LC1、第二液晶层LC2、第一偏光片P1和第二偏光片P2的情况下,其可藉由对第一液晶层LC1和/或第二液晶层LC2的操作来实现镜面模式和透明模式之间的切换。
偏光模块100的操作方法可包括以下步骤:提供如上所述的偏光模块100;以及使偏光模块100执行双镜面模式、单镜面模式或透明模式。
以下,将藉由图2A至图2C、图3A至图3D以及图4A至图4C来举例说明本发明不同实施例的偏光模块藉由对第一液晶层LC1和/或第二液晶层LC2的操作来实现镜面模式(包括双镜面模式和单镜面模式)和透明模式之间的切换。图2A至图2C、图3A至图3D以及图4A至图4C省略绘示了第一偏光片P1和第二偏光片P2,以清楚表达光线F1、F2穿透双面反射式偏光片RP或是被穿透双面反射式偏光片RP反射的态样。
当偏光模块100、200、300执行双镜面模式时,光线F1和光线F2可被双面反射式偏光片RP反射,使得偏光模块100、200、300的两侧皆呈镜面态。
当偏光模块100、200、300执行单镜面模式时,光线F1和光线F2中的其中一者可被双面反射式偏光片RP反射,使得偏光模块100、200、300的一侧呈镜面态;而光线F1和光线F2中的其中另一者可穿过双面反射式偏光片RP而被第一偏光片P1或第二偏光片P2吸收,使得偏光模块100、200、300的另一侧呈黑态。
当偏光模块100、200、300执行透明模式时,光线F1可穿过双面反射式偏光片RP和第二偏光片P2,使得偏光模块100、200、300的一侧呈透明态;而光线F2可穿过双面反射式偏光片RP和第一偏光片P1,使得偏光模块100、200、300的另一侧也呈透明态。
以下,将藉由图2A至图2C来说明本发明一实施例的偏光模块100藉由对第一液晶层LC1和/或第二液晶层LC2的操作来实现镜面模式和透明模式之间的切换。图2A至图2C分别表示偏光模块100执行双镜面模式、单镜面模式和透明模式的态样。在本实施例中,双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴。
请参照图2A,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴的情况下,可藉由未对第一液晶层LC1和第二液晶层LC2施加电压来执行双镜面模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F1可被双面反射式偏光片RP反射,而使得偏光模块100的一侧呈镜面态。反之亦然,通过第二偏光片P2的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F2可被双面反射式偏光片RP反射,而使得偏光模块100的另一侧也呈镜面态。
请参照图2B,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴的情况下,可藉由只对第一液晶层LC1和第二液晶层LC2中的其中一者施加电压来执行单镜面模式。举例来说,可对第二液晶层LC2施加电压而不对第一液晶层LC1施加电压,如此可使得通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直且与第一偏光片P1的吸收轴平行,故光线F2可穿透双面反射式偏光片RP而被第一偏光片P1吸收,使得偏光模块100的一侧呈黑态(如箭头F2’所示)。另一方面,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F1可被双面反射式偏光片RP反射,使得偏光模块100的另一侧呈镜面态。
请参照图2C,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴的情况下,可藉由同时对第一液晶层LC1和第二液晶层LC2施加电压来执行透明模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直,故可穿过双面反射式偏光片RP。当穿过双面反射式偏光片RP的极化光进一步通过第二液晶层LC2时,其偏振方向垂直于第二偏光片P2的吸收轴,故可穿过第二偏光片P2,如此可使得偏光模块100的一侧呈透明态。反之亦然,通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直,故可穿过双面反射式偏光片RP。当穿过双面反射式偏光片RP的极化光进一步通过第一液晶层LC1时,其偏振方向垂直于第一偏光片P1的吸收轴,故可穿过第一偏光片P1,如此可使得偏光模块100的另一侧也呈透明态。
以下,将藉由图3A至图3D来举例说明本发明另一实施例的偏光模块200藉由对第一液晶层LC1和/或第二液晶层LC2的操作来实现镜面模式和透明模式之间的切换。偏光模块200与偏光模块100相似,其不同之处仅在于偏光模块200中的双面反射式偏光片RP的反射轴垂直于第一偏光片P1和第二偏光片P2中的其中一者的吸收轴,故相同或相似元件使用相同或相似标号,其余构件的连接关系、材料及其制程已于前文中进行详尽地描述,故于下文中不再重复赘述。
图3A和图3D表示偏光模块200执行单镜面模式的态样;图3B表示偏光模块200执行双镜面模式的态样;图3C表示偏光模块200执行透明模式的态样。在本实施例中,双面反射式偏光片RP的反射轴垂直于第一偏光片P1和第二偏光片P2中的其中一者的吸收轴。
请同时参照图3A和图3D,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1和第二偏光片P2中的其中一者的吸收轴的情况下,可藉由同时对第一液晶层LC1和第二液晶层LC2施加电压(如图3D所示)或者不对第一液晶层LC1和第二液晶层LC2施加电压(如图3A所示)来执行单镜面模式。在本实施例中,双面反射式偏光片RP的反射轴可垂直于第一偏光片P1的吸收轴且平行于第二偏光片P2的吸收轴,但本发明不以此为限。在其他实施例中,双面反射式偏光片RP的反射轴可平行于第一偏光片P1的吸收轴且垂直于第二偏光片P2的吸收轴。
请参照图3A,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴且平行于第二偏光片P2的吸收轴的情况下,可藉由不对第一液晶层LC1和第二液晶层LC2施加电压来执行单镜面模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F1可被双面反射式偏光片RP反射,而使得偏光模块200的一侧为镜面态。另一方面,通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直且与第一偏光片P1的吸收轴平行,故光线F2可穿透双面反射式偏光片RP而被第一偏光片P1吸收,使得偏光模块200的另一侧呈黑态(如箭头F2’所示)。
请参照图3D,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴且平行于第二偏光片P2的吸收轴的情况下,可藉由同时对第一液晶层LC1和第二液晶层LC2施加电压来执行单镜面模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直且与第二偏光片P2的吸收轴平行,故光线F1可穿透双面反射式偏光片RP而被第二偏光片P2吸收,使得偏光模块200的一侧呈黑态(如箭头F1’所示)。另一方面,通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F2可被双面反射式偏光片RP反射,使得偏光模块200的另一侧呈镜面态。
请同时参照图3B和图3C,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1和第二偏光片P2中的其中一者的吸收轴的情况下,可藉由只对第一液晶层LC1和第二液晶层LC2中的其中一者施加电压来执行双镜面模式(如图3B所示)或透明模式(如图3C所示)。在本实施例中,双面反射式偏光片RP的反射轴可垂直于第一偏光片P1的吸收轴且平行于第二偏光片P2的吸收轴。在其他实施例中,双面反射式偏光片RP的反射轴可平行于第一偏光片P1的吸收轴且垂直于第二偏光片P2的吸收轴。
请参照图3B,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴且平行于第二偏光片P2的吸收轴的情况下,可藉由对第二液晶层LC2施加电压而不对第一液晶层LC1施加电压来执行双镜面模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F1可被双面反射式偏光片RP反射,而使得偏光模块200的一侧呈镜面态。另一方面,通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F2可被双面反射式偏光片RP反射,而使得偏光模块200的另一侧也呈镜面态。
请参照图3C,在双面反射式偏光片RP的反射轴垂直于第一偏光片P1的吸收轴且平行于第二偏光片P2的吸收轴的情况下,可藉由对第一液晶层LC1施加电压而不对第二液晶层LC2施加电压来执行透明模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直,故可穿过双面反射式偏光片RP。当穿过双面反射式偏光片RP的极化光进一步通过第二液晶层LC2时,其偏振方向垂直于第二偏光片P2的吸收轴,故可穿过第二偏光片P2,使得偏光模块100的一侧呈透明态。另一方面,通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直,故可穿过双面反射式偏光片RP。当穿过双面反射式偏光片RP的极化光进一步通过第一液晶层LC1时,其偏振方向垂直于第一偏光片P1的吸收轴,故可穿过第一偏光片P1,使得偏光模块200的另一侧呈透明态。
以下,将藉由图4A至图4C为举例说明本发明又一实施例的偏光模块300藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式和透明模式之间的切换的示意图。偏光模块300与偏光模块100相似,其不同之处仅在于偏光模块300中的双面反射式偏光片RP的反射轴平行于第一偏光片P1和第二偏光片P2的吸收轴,故相同或相似元件使用相同或相似标号,其余构件的连接关系、材料及其制程已于前文中进行详尽地描述,故于下文中不再重复赘述。
在本实施例中,图4A至图4C分别表示偏光模块300执行透明模式、单镜面模式和双镜面模式的态样。在本实施例中,双面反射式偏光片RP的反射轴平行于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴。
请参照图4A,在双面反射式偏光片RP的反射轴平行于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴的情况下,可藉由未对第一液晶层LC1和第二液晶层LC2施加电压来执行透明模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向垂直于双面反射式偏光片RP的反射轴和第二偏光片P2的吸收轴,故可穿过双面反射式偏光片RP和第二偏光片P2,使得偏光模块300的一侧呈透明态。反之亦然,通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向垂直于双面反射式偏光片RP的反射轴和第一偏光片P1的吸收轴,故可穿过双面反射式偏光片RP和第一偏光片P1,使得偏光模块300的另一侧也呈透明态。
请参照图4B,在双面反射式偏光片RP的反射轴平行于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴的情况下,可藉由只对第一液晶层LC1和第二液晶层LC2中的其中一者施加电压来执行单镜面模式。举例来说,可对第二液晶层LC2施加电压而不对第一液晶层LC1施加电压,如此可使得通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F2可被双面反射式偏光片RP反射,使得偏光模块300的一侧呈镜面态。另一方面,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴垂直且与第二偏光片P2的吸收轴平行,故光线F1可穿透双面反射式偏光片RP而被第二偏光片P2吸收,使得偏光模块300的另一侧呈黑态(如箭头F1’所示)。
请参照图4C,在双面反射式偏光片RP的反射轴平行于第一偏光片P1的吸收轴和第二偏光片P2的吸收轴的情况下,可藉由同时对第一液晶层LC1和第二液晶层LC2施加电压来执行双镜面模式。举例来说,通过第一偏光片P1和第一液晶层LC1的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F1可被双面反射式偏光片RP反射,使得偏光模块300的一侧呈镜面态。反之亦然,通过第二偏光片P2和第二液晶层LC2的极化光的偏振方向与双面反射式偏光片RP的反射轴平行,故光线F2可被双面反射式偏光片RP反射,使得偏光模块300的另一侧也呈镜面态。
图5为本发明一实施例的偏光模块的剖面示意图。图6为本发明另一实施例的偏光模块的剖面示意图。图7为本发明又一实施例的偏光模块的剖面示意图。
请参照图5,偏光模块100可更包括第一基板SUB1,其设置于第一液晶层LC1和第二液晶层LC2之间,使得第一液晶层LC1与第二液晶层LC2能够共用第一基板SUB1。在此实施例中,双面反射式偏光片RP可为线栅偏光片(WGP)。在本实施例中,第一液晶层LC1与第一偏光片P1之间以及第二液晶层LC2与第二偏光片P2还可包括另一基板SUB’。也就是说,偏光模块100可为三基板双晶胞(cell)的架构。
在一些实施例中,如图6所示,偏光模块100可更包括第二基板SUB2,其设置于双面反射式偏光片RP和第二液晶层LC2之间,且第一基板SUB1设置于双面反射式偏光片RP和第一液晶层LC1之间。也就是说,偏光模块100可为四基板双晶胞(cell)的架构。在此实施例中,双面反射式偏光片RP可为反射式偏光镜RPM。在另一些实施例中,如图7所示,第一基板SUB1和第二基板SUB2之间可具有气隙AG,以提升偏光模块100的隔热效率。
图8为本发明再一实施例的偏光模块的剖面示意图。
请参照图8,偏光模块100可选择性地包括侧光源LS和导光板LG。侧光源LS提供于双面反射式偏光片RP的一侧。导光板LG设置于双面反射式偏光片RP与第一液晶层LC1和第二液晶层LC2中的至少一者之间。在本实施例中,导光板LG分别设置于双面反射式偏光片RP与第一液晶层LC1和第二液晶层LC2之间。如此一来,侧光源LS的光线能够通过导光板LG而分别入射至双面反射式偏光片RP的相对两侧。由于侧光源LS的光线未经极化,故入射至双面反射式偏光片RP的相对两侧的部分光线能够被双面反射式偏光片RP反射,而入射至双面反射式偏光片RP的相对两侧的另一部分光线能够穿透双面反射式偏光片RP。如此一来,可透过对第一液晶层LC1和/或第二液晶层LC2的操作以及第一偏光片P1和/或第二偏光片P2的吸收轴的配置来实现如上所述的镜面模式和透明模式之间的切换。
综上所述,本发明的偏光模块包括如上所配置的双面反射式偏光片、第一液晶层、第二液晶层、第一偏光片和第二偏光片的情况下,其可藉由对第一液晶层和/或第二液晶层的操作来实现镜面模式(双镜面模式和单镜面模式)和透明模式之间的切换。
当然,本发明还可有其它多种实施例,在不背离本发明精神及其实质的情况下,熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形,但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。

Claims (18)

1.一种偏光模块,其特征在于,包括:
一双面反射式偏光片,具有相对的一第一表面和一第二表面;
一第一液晶层和一第二液晶层,分别设置于该第一表面上和该第二表面上;以及
一第一偏光片和一第二偏光片,分别设置于该第一液晶层上和该第二液晶层上。
2.如权利要求1所述的偏光模块,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片的吸收轴和该第二偏光片的吸收轴。
3.如权利要求1所述的偏光模块,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片和该第二偏光片中的其中一者的吸收轴。
4.如权利要求3所述的偏光模块,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片和该第二偏光片中的其中另一者的吸收轴。
5.如权利要求1所述的偏光模块,其特征在于,该双面反射式偏光片的反射轴平行于该第一偏光片的吸收轴和该第二偏光片中的吸收轴。
6.如权利要求1所述的偏光模块,其特征在于,更包括:
一第一基板,设置于该第一液晶层和该第二液晶层之间。
7.如权利要求6所述的偏光模块,其特征在于,更包括:
一第二基板,设置于该双面反射式偏光片和该第二液晶层之间,且该第一基板设置于该双面反射式偏光片和该第一液晶层之间。
8.如权利要求7所述的偏光模块,其特征在于,该第一基板和该第二基板之间具有一气隙。
9.如权利要求1所述的偏光模块,其特征在于,更包括:
一侧光源,提供于该双面反射式偏光片的一侧;以及
一导光板,设置于该双面反射式偏光片与该第一液晶层和该第二液晶层中的至少一者之间。
10.一种偏光模块的操作方法,其特征在于,包括:
提供如权利要求1所述的偏光模块;以及
使该偏光模块执行双镜面模式、单镜面模式或透明模式,
其中在光线被该双面反射式偏光片反射而通过该第一偏光片和该第二偏光片的情况下,该偏光模块为该双镜面模式,
其中在该光线被该双面反射式偏光片反射而只通过该第一偏光片和该第二偏光片中的其中一者的情况下,该偏光模块为该单镜面模式,
其中在该光线穿透该双面反射式偏光片的情况下,该偏光模块为该透明模式。
11.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片的吸收轴和该第二偏光片的吸收轴,藉由未对该第一液晶层和该第二液晶层施加电压来执行该双镜面模式。
12.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片的吸收轴和该第二偏光片的吸收轴,藉由只对该第一液晶层和该第二液晶层中的其中一者施加电压来执行该单镜面模式。
13.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片的吸收轴和该第二偏光片的吸收轴,藉由同时对该第一液晶层和该第二液晶层施加电压来执行该透明模式。
14.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片和该第二偏光片中的其中一者的吸收轴,藉由同时对该第一液晶层和该第二液晶层施加电压或者未对该第一液晶层和该第二液晶层施加电压来执行该单镜面模式。
15.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴垂直于该第一偏光片和该第二偏光片中的其中一者的吸收轴,藉由只对该第一液晶层和该第二液晶层中的其中一者施加电压来执行该双镜面模式或该透明模式。
16.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴平行于该第一偏光片的吸收轴和该第二偏光片中的吸收轴,藉由未对该第一液晶层和该第二液晶层施加电压来执行该透明模式。
17.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴平行于该第一偏光片的吸收轴和该第二偏光片中的吸收轴,藉由只对该第一液晶层和该第二液晶层中的其中一者施加电压来执行该单镜面模式。
18.如权利要求10所述的偏光模块的操作方法,其特征在于,该双面反射式偏光片的反射轴平行于该第一偏光片的吸收轴和该第二偏光片中的吸收轴,藉由同时对该第一液晶层和该第二液晶层施加电压来执行该双镜面模式。
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