CN111417819A - 光学层叠体 - Google Patents
光学层叠体 Download PDFInfo
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- CN111417819A CN111417819A CN201880077179.7A CN201880077179A CN111417819A CN 111417819 A CN111417819 A CN 111417819A CN 201880077179 A CN201880077179 A CN 201880077179A CN 111417819 A CN111417819 A CN 111417819A
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Classifications
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- C07D207/44—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having three double bonds between ring members or between ring members and non-ring members
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
本发明提供一种光学层叠体,其用于图像显示装置时,可在抑制反射率的同时,展现充分亮度并可展现良好色调,可实现成本的降低。本发明的光学层叠体具备:波长转换层与配置在波长转换层的单侧的吸收层;吸收层在580nm~610nm的波长区域具有吸收峰,且该吸收层包含通式(I)或通式(II)所示的化合物X。
Description
技术领域
本发明涉及光学层叠体。
现有技术
近年来,具备由量子点等发光材料构成的发光层的图像显示装置,作为色彩再现性优异的图像显示装置备受瞩目(例如专利文献1)。举例而言,使用了量子点的量子点膜只要有光入射,量子点便会受激发而发出萤光。例如当使用蓝色LED的背光时,一部分蓝色光通过量子点膜会转换为红色光及绿色光,而一部分蓝色光则直接射出蓝色光。结果可实现白色光。并且一般认为使用所述量子点膜可以实现NTSC比为100%以上的色彩再现性。
如上所述的图像显示装置其反射率高。因此,为了降低反射率,一般会在如上所述的图像显示装置使用偏振板。
然而,使用偏振板时,会产生亮度降低、色调异常、高成本等问题。因而对如上所述的图像显示装置寻求亮度的提升、色调的改善、成本的降低。
先前技术文献
专利文献
专利文献1:日本专利特开2015-111518号公报
发明内容
发明所要解决的问题
本发明是为了解决上述以往的课题而进行的,其主要目的在于提供一种光学层叠体,其在用于图像显示装置时,可在抑制反射率的同时,展现充分亮度并可展现良好色调,可实现成本的降低。
解决问题的手段
本发明的光学层叠体具备:波长转换层与配置在该波长转换层的单侧的吸收层;该吸收层在580nm~610nm的范围的波长区域具有吸收峰,且该吸收层包含下述通式(I)或通式(II)所示的化合物X。
在一个实施方式中,上述吸收层包含下述通式(I)或通式(II)所示的化合物X。
[化学式1]
式(I)中,R1、R2、R3、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R1与R2形成由5或6个碳原子构成的饱和环状骨架,R3、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R2与R3形成由5~7个碳原子构成的饱和环状骨架,R1、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R5与R6形成由5或6个碳原子构成的饱和环状骨架,R1、R2、R3、R4、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R6与R7形成由5~7个碳原子构成的饱和环状骨架,R1、R2、R3、R4、R5及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R1与R2形成由5或6个碳原子构成的饱和环状骨架,R5与R6形成由5或6个碳原子构成的饱和环状骨架,R3、R4、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者,
R2与R3形成由5~7个碳原子构成的饱和环状骨架,R6与R7形成由5~7个碳原子构成的饱和环状骨架,R1、R4、R5及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;
式(II)中,R4及R8分别独立地为氢原子或碳数1以上且20以下的取代或非取代的烷基。
在一个实施方式中,上述光学层叠体在上述吸收层的与波长转换层相反的一侧不具有偏振板。
在一个实施方式中,上述波长转换层含有量子点或萤光体作为波长转换材料。
在一个实施方式中,上述波长转换层为彩色滤光片。
根据本发明的另一方面,提供一种图像显示装置。该图像显示装置包含上述光学层叠体。
在一个实施方式中,上述图像显示装置具备:背光、和包含上述光学层叠体的液晶面板。
在一个实施方式中,上述液晶面板由观察侧起依序具备:上述吸收层、上述波长转换层、观察侧偏振板、液晶单元与背光侧偏振板。
发明效果
根据本发明可提供一种光学层叠体,其在用于图像显示装置时,可在抑制反射率的同时,展现充分亮度并可展现良好色调,可实现成本的降低。
附图说明
图1是本发明的一个实施方式的光学层叠体的示意剖面图。
图2为包含本发明的光学层叠体的图像显示装置的一个实施方式的示意剖面图。
图3是本发明的一个实施方式的光学层叠体的示意剖面图。
图4为包含本发明的光学层叠体的图像显示装置的一个实施方式的示意剖面图。
具体实施方式
以下说明本发明的优选实施方式,但本发明不受这些实施方式限定。
《《光学层叠体》》
图1是本发明的一个实施方式的光学层叠体的示意剖面图。本实施方式的光学层叠体100具备:波长转换层10;与吸收层20,其配置在波长转换层10的单侧。在一个实施方式中,上述光学层叠体100以使吸收层20成为观察侧的方式配置在图像显示装置的观察侧。
波长转换层是将入射光的一部分的波长转换并发光的层。
吸收层含有后述特定色素(通式(I)或(II)所示的色素)。通过含有所述特定色素而形成吸收层,可提供一种光学层叠体,其在用于图像显示装置时,可在抑制反射率的同时展现充分亮度,并可展现良好色调,可实现成本的降低。
在一个实施方式中,上述光学层叠体在吸收层的与波长转换层相反的一侧不具有偏振板。本发明的光学层叠体即使不具备偏振板,仍可在抑制反射率的同时展现充分亮度,并可展现良好色调。另外,通过将偏振板排除,可防止亮度降低及降低成本。此外,上述吸收层由于可高自由度地调整其机械特性,因此除了降低反射的功能之外,亦可做附加作为硬涂层的功能等设计。另外,本说明书中,“在吸收层的与波长转换层相反的一侧不具有偏振板”的方式还包含在该处不具有偏振片的方式及在该处不具有圆偏振板的方式。
本发明的光学层叠体的厚度优选为10μm~1000μm,更优选为15μm~800μm,进一步优选为20μm~600μm,特别优选为20μm~500μm。
光学层叠体的总光线反射率(测定方法在后文中详述)优选为60%以下,更优选为50%以下,进一步优选为40%以下,特别优选为35%以下,最优选为30%以下。光学层叠体的总光线反射率的下限值越小越好,例如为5%。
本发明中,对于基于光学层叠体的反射色调(a*,b*)(测定方法在后文中详述)的D65,Δab优选为8以下,更优选为7以下,进一步优选为6以下。Δab的下限値越小越好,理想地为0。本发明的光学层叠体的Δab只要在上述范围内,则在用于图像显示装置时可展现更良好的色调。此外,Δab可通过(a2+b2)1/2的式求得。
本发明的光学层叠体可在不损及本发明的效果的范围内具有任意且适当的其他层。
本发明的光学层叠体亦可具有保护膜。具体而言,本发明的光学层叠体举例而言亦可在吸收层的与波长转换层相反的一侧具有保护膜。
本发明的光学层叠体亦可具有折射率调整层。具体而言,本发明的光学层叠体例如亦可在吸收层的与波长转换层相反的一侧具有折射率调整层。
《波长转换层》
波长转换层代表地包含波长转换材料。更详细而言,波长转换层可含有基质与分散在该基质中的波长转换材料。
波长转换层举例而言亦可采用作为彩色滤光片。
波长转换层可为单一层,亦可具有层叠结构。在波长转换层具有层叠结构时,代表地,各层可含有具有不同发光特性的波长转换材料。
波长转换层的厚度(在具有层叠结构时为其总厚度)优选为1μm~500μm,更优选为100μm~400μm。若波长转换层的厚度在所述范围内,则可得到转换效率及耐久性优异的光学层叠体。波长转换层具有层叠结构时,各层的厚度优选为1μm~300μm,更优选为10μm~250μm。
<基质>
构成基质的材料(以下亦称为基质材料),可在不损及本发明的效果的范围内使用任意适当的材料。所述的材料例如可举树脂、有机氧化物、无机氧化物。基质材料优选具有低透氧性及低透湿性,且具有高光稳定性及高化学稳定性,具有预定折射率,具有优异的透明性和/或对波长转换材料具有优异的分散性。基质在实际使用上可由树脂膜或粘合剂来构成。
(树脂膜)
基质为树脂膜时,构成树脂膜的树脂可在不损及本发明效果的范围内使用任意且适当的树脂。具体而言,树脂可为热塑性树脂,可为热固化性树脂,亦可为活性能量射线固化性树脂。活性能量射线固化性树脂可举例如电子射线固化型树脂、紫外线固化型树脂、可见光线固化型树脂。
基质为树脂膜时,构成树脂膜的树脂的具体例可举例如环氧、(甲基)丙烯酸酯(例如甲基丙烯酸甲酯、丙烯酸丁酯)、降冰片烯、聚乙烯、聚(乙烯醇缩丁醛)、聚(乙酸乙烯酯)、聚脲、聚氨酯、氨基硅酮(AMS)、聚苯基甲基硅氧烷、聚苯基烷基硅氧烷、聚二苯基硅氧烷、聚二烷基硅氧烷、倍半硅氧烷、氟代硅酮、乙烯基及氢化物取代硅酮、苯乙烯系聚合物(例如聚苯乙烯、氨基聚苯乙烯(APS)、聚(丙烯腈乙烯苯乙烯)(AES))、经与二官能性单体交联的聚合物(例如二乙烯苯)、聚酯系聚合物(例如聚对苯二甲酸乙二醇酯)、纤维素系聚合物(例如三乙酰纤维素)、氯乙烯系聚合物、酰胺系聚合物、酰亚胺系聚合物、乙烯醇系聚合物、环氧系聚合物、硅酮系聚合物、丙烯酰氨基甲酸酯系聚合物。这些可单独使用,亦可组合(例如共混、共聚)使用。这些树脂亦可在形成膜后施行拉伸、加热、加压等处理。树脂优选为热固化性树脂或紫外线固化型树脂,更优选为热固化性树脂。
(粘合剂)
基质为粘合剂时,粘合剂可在不损及本发明效果的范围内使用任意适当的粘合剂。粘合剂优选具有透明性且在光学上为各向同性。粘合剂的具体例例如可举橡胶系粘合剂、丙烯酸系粘合剂、硅酮系粘合剂、环氧系粘合剂、纤维素系粘合剂。粘合剂优选为橡胶系粘合剂或丙烯酸系粘合剂。
<波长转换材料>
波长转换材料可控制波长转换层的波长转换特性。波长转换材料可举如量子点、萤光体。即,波长转换层优选含有量子点或萤光体作为波长转换材料。
波长转换层中波长转换材料的含量(使用2种以上时为合计含量),相对于基质材料(代表地为树脂或粘合剂固体成分)100重量份,优选为0.01重量份~50重量份,更优选为0.01重量份~30重量份。若波长转换材料的含量在所述范围内,则可实现RGB所有色调平衡优异的图像显示装置。
(量子点)
量子点的发光中心波长可依量子点的材料和/或组成、粒子尺寸、形状等来调整。
量子点可在无损本发明效果的范围内以任意且适当的材料构成。量子点可优选以无机材料构成,可更优选以无机导体材料或无机半导体材料构成。半导体材料可举如II-VI族、III-V族、IV-VI族及IV族的半导体。具体例可举Si、Ge、Sn、Se、Te、B、C(包含金刚石)、P、BN、BP、BAs、AlN、AlP、AlAs、AlSb、GaN、GaP、GaAs、GaSb、InN、InP、InAs、InSb、ZnO、ZnS、ZnSe、ZnTe、CdS、CdSe、CdSeZn、CdTe、HgS、HgSe、HgTe、BeS、BeSe、BeTe、MgS、MgSe、GeS、GeSe、GeTe、SnS、SnSe、SnTe、PbO、PbS、PbSe、PbTe、CuF、CuCl、CuBr、CuI、Si3N4、Ge3N4、Al2O3、(Al、Ga、In)2(S、Se、Te)3、Al2CO。这些可单独使用亦可将2种以上组合使用。量子点亦可含有p型掺杂剂或n型掺杂剂。量子点亦可具有核壳结构。所述核壳结构中,壳的周围可根据目的形成有任意适当的功能层(单一层或多层),且壳表面亦可经表面处理和/或化学修饰。
量子点形状可根据目的采用任意且适当的形状。量子点形状的具体例可举例如正球状、鳞片状、板状、椭圆球状、不定形。
量子点尺寸可根据所期望的发光波长采用任意且适当的尺寸。量子点的尺寸优选为1nm~10nm,更优选为2nm~8nm。量子点的尺寸若在所述范围内,则绿色及红色各自可展现鲜明的发光,可实现高显色性。举例而言,绿色光可在量子点的尺寸为7nm左右时发光,而红色光可在3nm左右时发光。此外,量子点的尺寸例如在量子点为正球状时为平均粒径,在其以外的形状时为沿该形状中的最小轴的尺寸。
量子点的详细情况例如已记载在日本特开2012-169271号公报、日本特开2015-102857号公报、日本特开2015-65158号公报、日本特表2013-544018号公报、日本特表2010-533976号公报中,本说明书援用这些公报的记载作为参考。量子点亦可使用市售品。
(萤光体)
萤光体可根据目的使用可发出所期望的颜色的光的任意适当的萤光体。具体例可举如红色萤光体、绿色萤光体。
红色萤光体可举例如已被Mn4+活化的复合氟化物萤光体。所谓复合氟化物萤光体意指下述配位化合物:含有至少一个配位中心(例如后述的M),且被作为配体使用的氟化物离子包围,并根据需求通过抗衡离子(例如后述的A)获得电荷补偿的物质。所述复合氟化物萤光体的具体例可举A2[MF5]:Mn4+、A3[MF6]:Mn4+、Zn2[MF7]:Mn4+、A[In2F7]:Mn4+、A2[M′F6]:Mn4+、E[M′F6]:Mn4+、A3[ZrF7]:Mn4+、Ba0.65Zr0.35F2.70:Mn4+。此处,A是Li、Na、K、Rb、Cs、NH4或其组合。M是Al、Ga、In或其组合。M′是Ge、Si、Sn、Ti、Zr或其组合。E是Mg、Ca、Sr、Ba、Zn或其组合。以配位中心的配位数为6的复合氟化物萤光体为优选。所述红色萤光体的详细情况记载在如日本特开2015-84327号公报中。本说明书中援用该公报的记载整体作为参考。
绿色萤光体可举例如含有具有β型Si3N4晶体结构的硅铝氮氧化物(日文原文:サイアロン)的固溶体作为主成分的化合物。优选进行处理使所述硅铝氮氧化物晶体中所含的氧量在特定量(例如0.8质量%)以下。通过进行所述处理,可得到峰宽度窄且发出鲜明的光的绿色萤光体。所述绿色萤光体的详细情况记载在如日本特开2013-28814号公报中。本说明书中援用该公报的记载整体作为参考。
《吸收层》
吸收层优选包含1种以上任意且适当的色料。代表地,在吸收层中,色料存在在基质中。
如上所述,上述吸收层在580nm~610nm的范围的波长区域具有吸收峰。若形成所述吸收层,则可在抑制可见光透射率降低(即亮度降低)的同时,提升防反射功能。另外,通过调整所吸收的光的波长,可使反射色调中性化,可得到着色少的光学层叠体。此外,吸收光谱可利用分光光度计(股份有限公司日立High-Technologies制,制品名“U-4100”)测定。
上述吸收层在波长580nm~610nm中的最大吸收峰的吸光度Amax、与在波长545nm的吸光度A545的比(A545/Amax)优选为0.13以下,更优选为0.12以下,进一步优选为0.11以下,特别优选为0.1以下。若依上所述形成在波长545nm中吸光度小的吸收层,则可吸收在色彩表现上不需要的光,而可得到可有助于图像显示装置的广色域化的光学层叠体。另外,由于不易吸收来自视觉敏感度高的545nm左右的光源的发光,因此可减少亮度降低的情形。
上述吸收层的位于波长580nm~610nm的范围内的吸收峰的半值宽度优选为35nm以下,更优选为30nm以下,进一步优选为25nm以下,特别优选为20nm以下。若在所述范围内,则可得到可有助于图像显示装置的广色域化的光学层叠体。
在一个实施方式中,上述吸收层在530nm~570nm的范围内不具有吸收峰。更具体而言,上述吸收层在530nm~570nm的范围内不具有吸光度为0.1以上的吸收峰。若形成所述吸收层,则可得到可有助于图像显示装置的广色域化的光学层叠体。
在一个实施方式中,上述吸收层进一步在440nm~510nm的范围的波长区域具有吸收峰。即,在本实施方式中,上述吸收层在440nm~510nm及580nm~610nm的范围的波长区域具有吸收峰。若为所述构成,则可良好地防止红色光与绿色光混色、以及绿色光与蓝色光混色。若将依所述方式构成的光学层叠体用作图像显示装置的防反射膜,则可使图像显示装置广色域化,可获得明亮且鲜艳的画质。如上所述地具有2个以上的吸收峰的吸收层,可通过使用多种色料来得到。
吸收层在吸收峰的透射率优选为0%~80%,更优选为0%~70%。若为所述范围内,则本发明的上述效果便更明显。
上述吸收层的可见光透射率优选为30%~90%,更优选为30%~80%。若在所述范围内,则可得到可在抑制亮度降低的同时发挥防反射功能的光学层叠体。
关于上述吸收层的雾度值,优选为15%以下,更优选为10%以下,进一步优选为5%以下。吸收层的雾度值越小越优选,但其下限例如为0.1%。
吸收层的厚度优选为1μm~100μm,更优选为2μm~30μm。
(色料)
在一个实施方式中,上述吸收层包含下述通式(I)或通式(II)所示的化合物X作为色料。化合物X是在580nm~610nm的范围的波长区域具有吸收峰的化合物。
[化学式2]
式(I)中,R1、R2、R3、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R1与R2形成由5或6个碳原子构成的饱和环状骨架,R3、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R2与R3形成由5~7个碳原子构成的饱和环状骨架,R1、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R5与R6形成由5或6个碳原子构成的饱和环状骨架,R1、R2、R3、R4、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R6与R7形成由5~7个碳原子构成的饱和环状骨架,R1、R2、R3、R4、R5及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R1与R2形成由5或6个碳原子构成的饱和环状骨架,R5与R6形成由5或6个碳原子构成的饱和环状骨架,R3、R4、R7及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者,
R2与R3形成由5~7个碳原子构成的饱和环状骨架,R6与R7形成由5~7个碳原子构成的饱和环状骨架,R1、R4、R5及R8分别独立地为氢原子、卤素原子(优选为Cl)、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基。
式(II)中,R4及R8分别独立地为氢原子或碳数1以上且20以下的取代或非取代的烷基。
含有R1与R2而形成的上述饱和环状骨架(碳数:5或6)及含有R5与R6而形成的上述饱和环状骨架(碳数:5或6)亦可具有取代基。该取代基可举如碳数1~4的烷基。另外,含有R2与R3而形成的上述饱和环状骨架(碳数:5~7)及含有R6与R7而形成的上述饱和环状骨架(碳数:5~7)亦可具有取代基。该取代基可举如碳数1~4的烷基。
在一个实施方式中,R4和/或R8具有苯环或萘环作为取代基。
上述式(I)或(II)所示的具体的化合物X可举如下述通式(I-1)~(I-27)或(II-1)所示的化合物。关于(I-1)~(I-23),列出在脂肪族聚碳酸酯混合化合物X而制备出树脂组合物后,测定由该树脂组合物形成的膜的吸光度而取得的吸收峰;关于(I-24)~(I-27)及(II-1),列出在聚甲基丙烯酸甲酯树脂混合化合物X而制备出树脂组合物后,测定由该树脂组合物形成的膜的吸光度而取得的吸收峰。
[化学式3]
[化学式4]
[化学式5]
[化学式6]
[化学式7]
[化学式8]
相对于基质材料100重量份,上述化合物X的含量优选为0.01重量份~50重量份,更优选为0.05重量份~10重量份,进一步优选为0.1重量份~5重量份,特别优选为0.1重量份~1重量份。
上述吸收层亦可进一步含有在440nm~510nm的范围的波长区域具有吸收峰的化合物。所述化合物可使用如蒽醌系、肟系、萘醌系、醌茜系、氧杂菁系、偶氮系、呫吨系或酞菁系化合物(染料)。
相对于基质材料100重量份,在440nm~510nm的范围的波长区域具有吸收峰的化合物的含量优选为0.01重量份~50重量份,更优选为0.01重量份~25重量份。
(基质)
基质可为粘合剂亦可为树脂膜。优选为粘合剂。另外,亦可使用树脂膜形成吸收层,并将该吸收层作为硬涂层等功能层(或亦可作为功能层的一要素)。
基质为粘合剂时,粘合剂可在不损及本发明效果的范围内使用任意适当的粘合剂。粘合剂优选具有透明性且在光学上为各向同性。粘合剂的具体例例如可举橡胶系粘合剂、丙烯酸系粘合剂、硅酮系粘合剂、环氧系粘合剂、纤维素系粘合剂。粘合剂优选为橡胶系粘合剂或丙烯酸系粘合剂。
橡胶系粘合剂(粘合剂组合物)的橡胶系聚合物是在室温左右的温度区中展现橡胶弹性的聚合物。优选的橡胶系聚合物(A)可举苯乙烯系热塑性弹性体(A1)、异丁烯系聚合物(A2)及其组合。
苯乙烯系热塑性弹性体(A1)可举例如苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)、苯乙烯-异戊二烯-苯乙烯嵌段共聚物(SIS)、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)、苯乙烯-乙烯-丙烯-苯乙烯嵌段共聚物(SEPS、SIS的氢化物)、苯乙烯-乙烯-丙烯嵌段共聚物(SEP、苯乙烯-异戊二烯嵌段共聚物的氢化物)、苯乙烯-异丁烯-苯乙烯嵌段共聚物(SIBS)、苯乙烯-丁二烯橡胶(SBR)等苯乙烯系嵌段共聚物。在这些中,由在分子两末端具有聚苯乙烯嵌段且作为聚合物具有高凝聚力的观点出发,优选苯乙烯-乙烯-丙烯-苯乙烯嵌段共聚物(SEPS、SIS的氢化物)、苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)、苯乙烯-异丁烯-苯乙烯嵌段共聚物(SIBS)。苯乙烯系热塑性弹性体(A1)亦可使用市售品。市售品的具体例例如可举Kuraray公司制的SEPTON、HYBRAR、ASAHI KASEI CHEMICALS CO.制的Tuftec、Kaneka公司制的SIBSTAR。
苯乙烯系热塑性弹性体(A1)的重均分子量优选为5万~50万左右,更优选为5万~30万左右,进一步优选为5万~25万左右。苯乙烯系热塑性弹性体(A1)的重均分子量若在所述范围内,则因可兼顾聚合物的凝聚力与粘弹性,因此优选。
苯乙烯系热塑性弹性体(A1)中的苯乙烯含量优选为5重量%~70重量%左右,更优选为5重量%~40重量%左右,进一步优选为10重量%~20重量%左右。苯乙烯系热塑性弹性体(A1)中的苯乙烯含量若在所述范围内,则可在保持基于苯乙烯部位的凝聚力的同时确保基于软段的粘弹性,因此优选。
异丁烯系聚合物(A2)可举如含有异丁烯作为构成单体且重均分子量(Mw)优选为50万以上的物质。异丁烯系聚合物(A2)可为异丁烯的均聚物(聚异丁烯,PIB),亦可为以异丁烯为主单体的共聚物(即,以异丁烯超过50摩尔%的比例共聚而成的共聚物)。所述共聚物可举例如异丁烯与正丁烯的共聚物、异丁烯与异戊二烯的共聚物(例如普通丁基橡胶(regular butyl rubber)、氯化丁基橡胶、溴化丁基橡胶、部分交联丁基橡胶等丁基橡胶类)、它们的硫化物或改性物(例如以羟基、羧基、氨基、环氧基等官能团改性后的物质)。在这些中,由主链中不含双键且耐候性优异的观点出发,优选聚异丁烯(PIB)。异丁烯系聚合物(A2)亦可使用市售品。市售品的具体例可举BASF公司制的OPPANOL。
异丁烯系聚合物(A2)的重均分子量(Mw)优选为50万以上,更优选为60万以上,进一步优选为70万以上。另外,重均分子量(Mw)的上限优选为500万以下,更优选为300万以下,进一步优选为200万以下。通过将异丁烯系聚合物(A2)的重均分子量设为50万以上,可得到高温保管时的耐久性进一步优异的粘合剂组合物。
粘合剂(粘合剂组合物)中的橡胶系聚合物(A)的含量,在粘合剂组合物的总固体成分中,优选为30重量%以上,更优选为40重量%以上,进一步优选为50重量%以上,特别优选为60重量%以上。橡胶系聚合物含量的上限优选为95重量%以下,更优选为90重量%以下。
橡胶系粘合剂中,亦可将橡胶系聚合物(A)与其他橡胶系聚合物组合使用。其他橡胶系聚合物的具体例可举例如丁基橡胶(IIR)、丁二烯橡胶(BR)、丙烯腈-丁二烯橡胶(NBR)、EPR(二元系乙烯-丙烯橡胶)、EPT(三元系乙烯-丙烯橡胶)、丙烯酸类橡胶、氨基甲酸酯橡胶、聚氨酯系热塑性弹性体;聚酯系热塑性弹性体;聚丙烯与EPT(三元系乙烯-丙烯橡胶)的聚合物共混物等共混物系热塑性弹性体。其他橡胶系聚合物的配合量相对于橡胶系聚合物(A)100重量份优选为10重量份左右以下。
丙烯酸系粘合剂(粘合剂组合物)的丙烯酸系聚合物代表地含有(甲基)丙烯酸烷基酯作为主成分,且可根据目的含有含芳香环(甲基)丙烯酸酯、含酰胺基的单体、含羧基的单体和/或含羟基的单体作为共聚成分。本说明书中,“(甲基)丙烯酸酯”意指丙烯酸酯和/或甲基丙烯酸酯。(甲基)丙烯酸烷基酯可例示直链状或支链状烷基的碳数为1~18的物质。含芳香环(甲基)丙烯酸酯是在其结构中含有芳香环结构且含有(甲基)丙烯酰基的化合物。作为芳香环,可举如苯环、萘环或联苯环。含芳香环(甲基)丙烯酸酯可满足耐久性(尤其是针对透明导电层的耐久性),并且可改善周边部的泛白引起的显示不均。含酰胺基的单体是在其结构中含有酰胺基且含有(甲基)丙烯酰基、乙烯基等聚合性不饱和双键的化合物。含羧基的单体是在其结构中含有羧基且含有(甲基)丙烯酰基、乙烯基等聚合性不饱和双键的化合物。含羟基的单体是在其结构中含有羟基且含有(甲基)丙烯酰基、乙烯基等聚合性不饱和双键的化合物。丙烯酸系粘合剂的详细情况例如已记载在日本特开2015-199942号公报中,本说明书援用该公报的记载作为参考。
基质为树脂膜时,构成树脂膜的树脂可使用任意且适当的树脂。具体而言,树脂可为热塑性树脂,可为热固化性树脂,亦可为活性能量射线固化性树脂。活性能量射线固化性树脂可举例如电子射线固化型树脂、紫外线固化型树脂、可见光线固化型树脂。
基质为树脂膜时,构成树脂膜的树脂的具体例可举例如环氧、(甲基)丙烯酸酯(例如甲基丙烯酸甲酯、丙烯酸丁酯)、降冰片烯、聚乙烯、聚(乙烯醇缩丁醛)、聚(乙酸乙烯酯)、聚脲、聚氨酯、氨基硅酮(AMS)、聚苯基甲基硅氧烷、聚苯基烷基硅氧烷、聚二苯基硅氧烷、聚二烷基硅氧烷、倍半硅氧烷、氟代硅酮、乙烯基及氢化物取代硅酮、苯乙烯系聚合物(例如聚苯乙烯、氨基聚苯乙烯(APS)、聚(丙烯腈乙烯苯乙烯)(AES))、经与二官能性单体交联的聚合物(例如二乙烯苯)、聚酯系聚合物(例如聚对苯二甲酸乙二醇酯)、纤维素系聚合物(例如三乙酰纤维素)、氯乙烯系聚合物、酰胺系聚合物、酰亚胺系聚合物、乙烯醇系聚合物、环氧系聚合物、硅酮系聚合物、丙烯酰氨基甲酸酯系聚合物。这些可单独使用,亦可组合(例如共混、共聚)使用。这些树脂亦可在形成膜后施行拉伸、加热、加压等处理。树脂优选为热固化性树脂或紫外线固化型树脂,更优选为热固化性树脂。
《保护膜》
保护膜可采用任意且适当的膜。作为所述膜的主成分的材料的具体例,可举如三乙酰纤维素(TAC)等纤维素系树脂、(甲基)丙烯酸系树脂、聚酯系树脂、聚乙烯醇系树脂、聚碳酸酯系树脂、聚酰胺系树脂、聚酰亚胺系树脂、聚醚砜系树脂、聚砜系树脂、聚苯乙烯系树脂、聚降冰片烯系树脂、聚烯烃系树脂及乙酸酯系树脂等透明树脂。另外,亦可举出丙烯酸系树脂、氨基甲酸酯系树脂、丙烯酰氨基甲酸酯系树脂、环氧系树脂、硅酮系树脂等热固化型树脂或紫外线固化型树脂等。其他亦可举出例如硅氧烷系聚合物等玻璃质系聚合物。此外,亦可使用日本专利特开2001-343529号公报(WO01/37007)所记载的聚合物膜。作为该膜的材料,例如可以使用含有在侧链具有取代或非取代的酰亚胺基的热塑性树脂与在侧链具有取代或非取代的苯基以及腈基的热塑性树脂的树脂组合物,例如可举出具有包含异丁烯与N-甲基马来酰亚胺的交替共聚物及丙烯腈-苯乙烯共聚物的树脂组合物。上述聚合物膜例如可为上述树脂组合物的挤出成形物。层叠偏振片与保护膜可采用任意且适当的粘合剂层或粘接剂层。粘合剂层代表地以丙烯酸系粘合剂形成。粘接剂层代表地以聚乙烯醇系粘接剂形成。
《折射率调整层》
折射率调整层的折射率优选为1.2以下,更优选为1.15以下,进一步优选为1.01~1.1。若折射率调整层的折射率在所述范围内,则可提升从波长转换层射出的光的利用效率,并且可抑制外光反射。
折射率调整层代表地在内部具有空隙。折射率调整层的空隙率可取任意且适当的值。折射率调整层的空隙率优选为5%~99%,更优选为25%~95%。通过使折射率调整层的空隙率在所述范围内,可充分压低折射率调整层的折射率,并可获得高机械强度。
内部具有空隙的折射率调整层亦可由例如具有粒状、纤维状、平板状的至少一种形状的结构构成。形成粒状的结构体(构成单元)可为实心粒子亦可为中空粒子,具体上可列举如硅酮粒子、具有微细孔的硅酮粒子、二氧化硅中空纳米粒子、二氧化硅中空纳米球。纤维状的构成单元例如是直径为纳米尺寸的纳米纤维,具体上可列举纤维素纳米纤维、氧化铝纳米纤维。平板状的构成单元可举如纳米粘土,具体上可列举如纳米尺寸的膨润土(例如Kunipia F(商品名))。
构成折射率调整层的材料可采用任意且适当的材料。所述材料可采用例如记载在国际公开第2004/113966号小册子、日本特开2013-254183号公报及日本特开2012-189802号公报的材料。具体而言可举例如:二氧化硅系化合物;水解性硅烷类、以及其部分水解物及脱水缩合物;有机聚合物;含硅醇基的硅化合物;使硅酸盐与酸、离子交换树脂接触而获得的活性二氧化硅;聚合性单体(例如(甲基)丙烯酸系单体及苯乙烯系单体);固化性树脂(例如(甲基)丙烯酸系树脂、含氟树脂及氨基甲酸酯树脂);以及这些的组合。
有机聚合物可举例如聚烯烃类(例如聚乙烯及聚丙烯)、聚氨酯类、含氟聚合物(例如以含氟单体单元与用于赋予交联反应性的构成单元为构成成分的含氟共聚物)、聚酯类(例如聚(甲基)丙烯酸衍生物(本说明书中所谓(甲基)丙烯酸是意指丙烯酸及甲基丙烯酸,且所有的“(甲基)”皆以该含义使用))、聚醚类、聚酰胺类、聚酰亚胺类、聚脲类及聚碳酸酯类。
构成折射率调整层的材料优选含有二氧化硅系化合物;水解性硅烷类以及其部分水解物及脱水缩合物。
二氧化硅系化合物举例而言可为SiO2(硅酸酐);含有SiO2与选自由Na2O-B2O3(硼硅酸)、Al2O3(氧化铝)、B2O3、TiO2、ZrO2、SnO2、Ce2O3、P2O5、Sb2O3、MoO3、ZnO2、WO3、TiO2-Al2O3、TiO2-ZrO2、In2O3-SnO2及Sb2O3-SnO2构成的组中的至少一种化合物的化合物(上述“-”表示其为复合氧化物)。
水解性硅烷类可举例如含有亦可具有取代基(例如氟)的烷基的水解性硅烷类。上述水解性硅烷类以及其部分水解物及脱水缩合物优选为烷氧基硅烷及倍半硅氧烷。
烷氧基硅烷可为单体,亦可为低聚物。烷氧基硅烷单体优选具有3个以上烷氧基。烷氧基硅烷单体可举例如甲基三甲氧基硅烷、甲基三乙氧基硅烷、苯基三乙氧基硅烷、四甲氧基硅烷、四乙氧基硅烷、四丁氧基硅烷、四丙氧基硅烷、二乙氧基二甲氧基硅烷、二甲基二甲氧基硅烷及二甲基二乙氧基硅烷。烷氧基硅烷低聚物优选为通过烷氧基硅烷单体的水解及聚缩所获得的缩聚物。构成折射率调整层的材料使用烷氧基硅烷,由此可得到具有优异均匀性的折射率调整层。
倍半硅氧烷为以通式RSiO1.5(其中,R表示有机官能团)表示的网状聚硅氧烷的总称。R可举例如烷基(可为直链亦可为支链,且碳数为1~6)、苯基及烷氧基(例如甲氧基及乙氧基)。倍半硅氧烷的结构可举例如梯子型及笼型。上述材料使用倍半硅氧烷,由此可获得具有优异均匀性、耐候性、透明性及硬度的折射率调整层。
上述粒子可采用任意且适当的粒子。上述粒子代表地为二氧化硅粒子。
二氧化硅粒子的形状例如可通过透射电子显微镜观察来确认。二氧化硅粒子的平均粒径优选为5nm~200nm,更优选为10nm~200nm。通过具有上述构成,可获得折射率充分低的折射率调整层,并且可维持折射率调整层的透明性。此外,在本说明书中,平均粒径意指根据利用氮吸附法(BET法)测得的比表面积(m2/g),通过平均粒径=(2720/比表面积)的式子所赋予的值(参照日本专利特开平1-317115号)。
得到折射率调整层的方法可举如记载在日本特开2010-189212号公报、日本特开2008-040171号公报、日本特开2006-011175号公报、国际公开第2004/113966号小册子及它们的参考文献中的方法。具体而言可举例如以下方法:使二氧化硅系化合物、水解性硅烷类以及其部分水解物及脱水缩合物中的至少任一种水解及缩聚的方法;使用多孔粒子和/或中空微粒子的方法;以及利用弹回(spring back)现象来生成气凝胶层的方法;使用粉碎凝胶的方法,该粉碎凝胶是将通过溶胶凝胶法得到的凝胶粉碎,并以催化剂等使上述粉碎液中的微细孔粒子彼此化学结合而成的。但,折射率调整层并不限定于该制造方法,可使用任何制造方法来制造。
折射率调整层可经由任意适当的粘接层(例如粘接剂层、粘合剂层:并未示于附图中)贴合在波长转换层、吸收层。折射率调整层以粘合剂构成时,可省略粘接层。
折射率调整层的雾度例如为0.1%~30%,优选为0.2%~10%。
折射率调整层的机械强度举例而言期望基于BEMCOT(注册商标)的耐擦伤性为60%~100%。
折射率调整层与波长转换层或与吸收层之间的锚固力并无特别限制,但优选为0.01N/25mm以上,更优选为0.1N/25mm以上,进一步优选为1N/25mm以上。此外,为了提升机械强度及锚固力,亦可在涂膜形成前后、将其与任意适当的粘接层、或者其他构件贴合前后的步骤中,施行底涂处理、加热处理、加湿处理、UV处理、电晕处理、等离子体处理等。
折射率调整层的厚度优选为100nm~5000nm,更优选为200nm~4000nm,进一步优选为300nm~3000nm,特别优选为500nm~2000nm。若在所述范围内,则可实现一种折射率调整层,其可对可见光区域的光充分展现光学上的功能并具有优异耐久性。
《《图像显示装置》》
图2为包含本发明的光学层叠体的图像显示装置的一个实施方式的示意剖面图。图2中图示图像显示装置为液晶显示装置的情形作为代表例。液晶显示装置1000具备液晶面板200与背光300,且本发明的光学层叠体可为液晶面板200的构件。波长转换层可作为液晶面板200所具备的彩色滤光片。
在一个实施方式中,光学层叠体是具有波长转换层与吸收层的光学层叠体,且在吸收层的与波长转换层相反的一侧不具有偏振板。所述本发明的光学层叠体的一个实施方式,举例而言如图3所示,依序具有吸收层20、波长转换层10与偏振板30。图3中,代表地吸收层20侧为观察侧,而偏振板30的一侧为背光侧。当然,图3仅为本发明的光学层叠体的一个实施方式,本发明的光学层叠体并不限于图3所示的实施方式。
液晶显示装置1000更具体来说可采用如图4所示的实施方式。图4中,液晶显示装置1000具备液晶面板200与背光300,且液晶面板200依序具有吸收层20、波长转换层10、偏振板(观察侧偏振板)30a、液晶单元40与偏振板(背光侧偏振板)30b。图4中,吸收层20侧为观察侧,而偏振板(背光侧偏振板)30b侧为背光侧。当然,图4仅为包含本发明的光学层叠体的图像显示装置的一个实施方式,包含本发明的光学层叠体的图像显示装置并不限于图4所示的实施方式。
背光具备的光源可举例如冷阴极管光源(CCFL)、LED光源等。在一个实施方式中,上述背光具备LED光源。若使用LED光源,则可得到视角特性优异的图像显示装置。在一个实施方式中,使用发出蓝色光的光源(以LED光源为优选)。
背光可为直下型方式,亦可为侧光型方式。
背光除光源外,可根据需要还具备导光板、扩散板、棱镜片等其他构件。
液晶面板代表地具备液晶单元。
液晶单元具有一对基板与被夹持在该基板间作为显示介质的液晶层。在一般的构成中,在一个基板设有彩色滤光片(例如波长转换层)及黑矩阵,在另一个基板设有:控制液晶的电光学特性的切换元件、赋予该切换元件闸控信号的扫描线及赋予该切换元件源信号的信号线、像素电极及对置电极。上述基板的间隔(单元间隙)可通过间隔件等来控制。在上述基板的与液晶层接触的一侧,举例而言可设置包含聚酰亚胺的取向膜等。
在一个实施方式中,液晶层包含在不存在电场的状态下取向成垂直排列的液晶分子。所述液晶层(结果为液晶单元)代表地展现nz>nx=ny的三维折射率。使用在不存在电场的状态下取向成垂直排列的液晶分子的驱动模式可举例如垂直配向(VA)模式。VA模式包含多域VA(MVA)模式。
在另一个实施方式中,液晶层包含在不存在电场的状态下取向成水平排列的液晶分子。所述液晶层(结果为液晶单元)代表地展现nx>ny=nz的三维折射率。此外,本说明书中,所谓ny=nz不只包含ny与nz完全相同的情形,亦包含ny与nz在实质上相同的情形。使用展现所述三维折射率的液晶层的驱动模式的代表例可举如平面内切换(IPS)模式、边缘电场切换(FFS)模式等。此外,上述IPS模式包含采用了V字型电极或锯齿形电极等的超级平面内切换(S-IPS)模式、进阶超级平面内切换(AS-IPS)模式。另外,上述FFS模式包含采用了V字型电极或锯齿形电极等的进阶边缘电场切换(A-FFS)模式、极端边缘电场切换(U-FFS)模式。此外,“nx”为面内折射率成最大的方向(即慢轴方向)的折射率,“ny”为在面内与慢轴正交的方向(即快轴方向)的折射率,而“nz”为厚度方向的折射率。
实施例
以下,以实施例来具体说明本发明,但本发明不受这些实施例限定。另外,各特性的测定方法如以下所述。
[反射率、反射光谱、反射色调(a*,b*)]
使用Konica Minolta公司制的分光测色计CM-2600d(光源:D65),测定了实施例及比较例中所得到的光学层叠体的总光线反射率、反射光谱、反射色调(a*,b*)。此外,在为具有波长转换层与吸收层的光学层叠体的情况下,通过参考日本专利2549388号制成的丙烯酸系粘合剂(厚度20μm),将反射板(东丽(Toray)膜加工公司制,Cerapeel DMS-X42)贴合在波长转换层侧,并从吸收层侧使光入射。
[Δab]
通过(a2+b2)1/2的式子从上述反射色调(a*,b*)求出Δab。
[正面亮度]
将实施例及比较例中所得到的光学层叠体设置成波长转换层为光源侧,并使用蓝色LED的均匀发光照明(AITEC SYSTEM公司制:型号:TMN150×180-22BD-4)作为光源,以亮度计(Konica Minolta公司制,商品名“SR-UL1”)测定亮度。此外,均匀发光照明的发光亮度在仅有波长转换层时为1335cd/m2。
[实施例1]
(波长转换层)
将市售的TV(Samsung公司制,商品名“UN65JS9000FXZA”)分解,而获得了背光侧含有的波长转换材料,即量子点片材。将此量子点片材作为波长转换层(1)。
(吸收层)
制作出下述含色素粘合剂:相对于由丙烯酸正丁酯、含羟基的单体共聚而成的丙烯酸系聚合物100重量份,含有自由基引发剂(过氧化苯甲酰,日本油脂公司制,商品名“NYPER BMT”)0.3重量份、异氰酸酯系交联剂(Tosoh公司制,商品名“Coronate L”)1重量份、下述通式(I-20)所示的方酸化合物0.3重量份、酚系抗氧化剂(BASF Japan公司制,商品名“IRGANOX 1010”)0.2重量份而成。以涂布器将上述所得到的含色素粘合剂以20μm的厚度涂敷在已施行过易使粘合剂剥离的处理的PET基材(三菱树脂公司制,商品名“MRF38CK”)上,并在155℃下干燥2分钟后,贴合在TAC(三乙酰纤维素膜,Fujifilm公司制),而在TAC上形成吸收层(1)(吸收极大波长:594nm)。
此外,通式(I-20)所示的方酸化合物是以以下方法合成。
<方酸化合物的合成>
依“M.Beller et.al.,J.Am.Chem.Soc.,2013,135(30),11384-11388)”所记载的方法合成1-苯基-1,4,5,6-四氢环戊[b]吡咯。
在乙醇5mL中混合1-苯基-1,4,5,6-四氢环戊[b]吡咯300mg与方酸80mg,并在80℃下搅拌2小时。然后,令其冷却至室温,并滤取出产物。将滤取出的产物用乙醇清洗,并在70℃进行减压干燥,而得到197mg的方酸化合物。然后以硅胶层析法进行纯化,而得到120mg的方酸化合物。
[化学式9]
(光学层叠体)
将上述波长转换层(1)与上述吸收层(1)层叠,而得到具有波长转换层/吸收层的层叠结构的光学层叠体(1)。将光学层叠体(1)供于上述评估。将结果列在表1。
[比较例1]
使用卟啉系色素(山本化成公司制,商品名“PD-320”)0.3重量份取代通式(I-20)所示的方酸化合物0.3重量份,除此之外依与实施例1相同方式而得到包含波长转换层(1)与吸收层(1)(吸收极大波长:595nm)的光学层叠体(2)。将光学层叠体(2)供于上述评估。将结果列在表1。
[比较例2]
不使形成吸收层的粘合剂中含有色素(方酸化合物)(即不形成吸收层而形成粘合剂层),除此之外依与实施例1相同方式而得到光学层叠体(3)。将光学层叠体(3)供于上述评估。将结果列在表1。
[表1]
色素 | a<sup>*</sup> | b<sup>*</sup> | Δab | |
实施例1 | 方酸化合物 | -0.96 | 5.9 | 6 |
比较例1 | 卟啉化合物 | -7.7 | -2.7 | 8.2 |
比较例2 | - | -3.8 | 33 | 33 |
产业上的可利用性
本发明的光学层叠体可适宜用于图像显示装置。
符号说明
10...波长转换层
20...吸收层
100...光学层叠体
200...液晶面板
300...背光
1000...液晶显示装置
Claims (7)
1.一种圆偏振板,其具备波长转换层和配置在该波长转换层的单侧的吸收层,
该吸收层在580nm~610nm的范围的波长区域具有吸收峰,
该吸收层包含下述通式(I)或通式(II)所示的化合物X:
式(I)中,R1、R2、R3、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基;或者
R1与R2形成由5或6个碳原子构成的饱和环状骨架,R3、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基,其中,卤素原子优选为Cl;或者
R2与R3形成由5~7个碳原子构成的饱和环状骨架,R1、R4、R5、R6、R7及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基,其中,卤素原子优选为Cl;或者
R5与R6形成由5或6个碳原子构成的饱和环状骨架,R1、R2、R3、R4、R7及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基,其中,卤素原子优选为Cl;或者
R6与R7形成由5~7个碳原子构成的饱和环状骨架,R1、R2、R3、R4、R5及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基,其中,卤素原子优选为Cl;或者
R1与R2形成由5或6个碳原子构成的饱和环状骨架,R5与R6形成由5或6个碳原子构成的饱和环状骨架,R3、R4、R7及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基,其中,卤素原子优选为Cl;或者,
R2与R3形成由5~7个碳原子构成的饱和环状骨架,R6与R7形成由5~7个碳原子构成的饱和环状骨架,R1、R4、R5及R8分别独立地为氢原子、卤素原子、碳数1以上且20以下的取代或非取代的烷基、式(a)所示的取代基或式(b)所示的取代基,其中,卤素原子优选为Cl;
式(II)中,R4及R8分别独立地为氢原子或碳数1以上且20以下的取代或非取代的烷基。
2.根据权利要求1所述的光学层叠体,其中,在所述吸收层的与波长转换层相反的一侧不具有偏振板。
3.根据权利要求1所述的光学层叠体,其中,所述波长转换层含有量子点或萤光体作为波长转换材料。
4.根据权利要求1所述的光学层叠体,其中,所述波长转换层为彩色滤光片。
5.一种图像显示装置,其包含权利要求1所述的光学层叠体。
6.根据权利要求5所述的图像显示装置,其具备背光和包含权利要求1所述的光学层叠体的液晶面板。
7.根据权利要求6所述的图像显示装置,其中,所述液晶面板由观察侧起依序具备:所述吸收层、所述波长转换层、观察侧偏振板、液晶单元和背光侧偏振板。
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