CN106029806A - 密封胶带、荧光体片、照明装置、液晶显示装置、荧光体片的制造方法以及密封方法 - Google Patents
密封胶带、荧光体片、照明装置、液晶显示装置、荧光体片的制造方法以及密封方法 Download PDFInfo
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- CN106029806A CN106029806A CN201580008935.7A CN201580008935A CN106029806A CN 106029806 A CN106029806 A CN 106029806A CN 201580008935 A CN201580008935 A CN 201580008935A CN 106029806 A CN106029806 A CN 106029806A
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- sealant tape
- fluorophor
- tape
- film
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Abstract
本发明提供一种即使在折弯粘贴的情况下,也能够防止胶带宽度的偏差、气泡的混入以及褶皱的产生的密封胶带、使用该密封胶带的荧光体片、照明装置、液晶显示装置、荧光体片的制造方法以及密封方法。密封胶带(10)将胶粘层(11)、气体阻隔层(12)、粘接层(13)、支撑膜层(14)以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在支撑膜层(14)的厚度方向上形成切口(15)。由此,即使在折弯粘贴的情况下,也能够防止胶带宽度的偏差、气泡的混入以及褶皱的产生。
Description
对关联申请的交叉引用
本申请主张日本专利申请2014-32279号(2014年2月21日申请)的优先权,并将该申请的全部公开内容援引于此。
技术领域
本发明涉及阻隔水蒸气的密封胶带、使用了该密封胶带的荧光体片、照明装置、液晶显示装置、荧光体片的制造方法以及密封方法。
背景技术
在液晶显示器中使用从背面向前面照射液晶面板的背光源。近些年,伴随液晶显示器的大型化、薄型化、轻量化、长寿命化等,另外基于根据闪烁控制而对动画特性改善的观点,在基板上配置多个发光二极管(LED:LightEmitting Diode)而进行面发光的发光装置受到瞩目。在这样的发光装置中,为了提取白光,主要使用以下的两种方法。
第一种方法是配置分别发出R、G、B三种颜色的光的LED,并通过将它们同时点亮,使三种颜色的光合成而得到白光。并且,第二种方法是例如通过含荧光体树脂将蓝色LED包围,从而使蓝光变换为白光。该通过含荧光体树脂将蓝色LED包围而得到的结构体称为“白色LED”。
然而,第一种方法需要R、G、B三种颜色的LED,因此成本高。另外,在上述第二种方法中,因为要对LED的微小面积灌注(potting)含荧光体树脂,因此难以均匀地形成含荧光体树脂。
由此,近些年来,作为代替第二种方法的第三种方法,即,使用由片基材夹住含荧光体树脂而成的材料或将含荧光体树脂加工成片状的含荧光体片,并通过蓝色LED进行颜色变换的方法受到瞩目(例如,参考专利文献1、2。)。
荧光体还存在不耐氧气和/或水蒸气的荧光体。例如,SrGa2S4:Eu、CaS:Eu、SrS:Eu等硫化物荧光体具有尖锐的发光光谱,因此是能够实现广色域的色彩再现的优良的荧光体材料,(Ba,Sr)3SiO5:Eu是高亮度的发橙光荧光体材料,但在高温高湿环境下容易因水蒸气而劣化。
在使用这些荧光体的情况下,需要某些方法来阻隔水蒸气。在白色LED中,难以采用这些荧光体,但对于第三种方法,可以通过利用水蒸气阻隔膜覆盖荧光体层等来采取对策。作为例子,提出了在含荧光体树脂上设置硅化合物等保护层的方法(参考专利文献3),或在含荧光体树脂的表面形成水蒸气阻隔层的方法(参考专利文献4、5)。
另外,作为防止水分从端部侵入的对策,例举了如图14所示的袋装(pouch)结构。袋装结构是由第一膜101和第二膜102来夹持荧光体层123,进一步地,利用第一水蒸气阻隔膜121和第二水蒸气阻隔膜122分别夹持第一膜101和第二膜102的外侧,并由密封树脂103来进行密封的结构,该结构层数多,不容易制作。
另外,例举了如图15所示的胶带密封结构。胶带密封结构是由第一水蒸气阻隔膜121和第二水蒸气阻隔膜122来夹持荧光体层123,并利用密封胶带130密封第一水蒸气阻隔膜121和第二阻隔膜122的端部的结构,该结构层数少,容易制作。作为胶带,铝箔比较有效,除此以外,还例举了蒸镀了二氧化硅的PET(Polyethylene terephthalate:对苯二甲酸乙二醇酯)等水蒸气透过率在1g/m2/day(40℃/90%RH)以下的材料。
现有技术文献
专利文献
专利文献1:日本特开2005-108635号公报
专利文献2:日本特开2009-283438号公报
专利文献3:日本特公平6-58440号公报
专利文献4:日本特开2009-283441号公报
专利文献5:日本特开2011-13567号公报
发明内容
技术问题
然而,对于现有的密封胶带,在折弯粘贴的情况下,会产生胶带宽度偏差、气泡混入、褶皱等,影响端部的密封性。
本发明鉴于以上情况,提供一种即使在折弯粘贴的情况下,也能够防止胶带宽度的偏差、气泡的混入以及褶皱的产生的密封胶带、使用该密封胶带的荧光体片、照明装置、液晶显示装置、荧光体片的制造方法以及密封方法。
技术方案
为解决上述课题,本发明的密封胶带的特征在于,该密封胶带是将胶粘层、气体阻隔层、粘接层、支撑膜层以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在上述支撑膜层的厚度方向上形成切口而成。
另外,本发明的荧光体片的特征在于具备:第一水蒸气阻隔膜;第二水蒸气阻隔膜;荧光体层,被上述第一水蒸气阻隔膜和上述第二水蒸气阻隔膜夹持;以及密封胶带,密封上述第一水蒸气阻隔膜和上述第二阻隔膜的端部,其中,上述密封胶带是将胶粘层、气体阻隔层、粘接层、支撑膜层以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在上述支撑膜层的厚度方向上形成切口而成。
另外,本发明的照明装置的特征在于具备上述荧光体片。
另外,本发明的液晶显示装置的特征在于具备上述荧光体片。
另外,本发明的荧光体片的制造方法的特征在于,在利用第一水蒸气阻隔膜和第二水蒸气阻隔膜夹持荧光体层,并利用密封胶带粘贴上述第一水蒸气阻隔膜和上述第二阻隔膜的端部的荧光体片的制造方法中,上述密封胶带是将胶粘层、气体阻隔层、粘接层、支撑膜层以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在上述支撑膜层的厚度方向上形成切口而成。
另外,本发明的密封方法的特征在于,在利用密封胶带粘贴第一膜和上述第二膜的端部的密封方法中,上述密封胶带是将胶粘层、气体阻隔层、粘接层和支撑膜层以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在上述支撑膜层的厚度方向上形成切口而成。
发明效果
根据本发明,在宽度方向的大致中心部沿长边方向,在支撑膜层的厚度方向上形成切口,因此即使在折弯粘贴的情况下,也能够防止胶带宽度的偏差、气泡的混入以及褶皱的产生。
附图说明
图1是示出本实施方式的密封胶带的结构的截面图。
图2是表示荧光体片的端部的构成例的截面图。
图3是用于说明荧光体片的制造方法的一例的示意图。
图4是表示侧光式的照明装置的示意截面图。
图5是表示直下式的照明装置的示意截面图。
图6是使用了硫化物系荧光体的背光、以及使用了现有的黄色荧光体的背光的光谱。
图7是示出使用了使用有硫化物系荧光体的背光、以及使用有现有的黄色荧光体的背光的液晶显示装置的色彩空间的CIE1931色度图。
图8是示出比较例一的胶带结构的示意截面图。
图9是示意性示出胶带宽度的偏差的示意截面图。
图10是示意性示出气泡的混入的示意截面图。
图11是示出比较例二的胶带结构的示意截面图。
图12是示意性示出无法折弯的状态的示意截面图。
图13是示出实施例一的胶带结构的示意截面图。
图14是示出现有的荧光体片的袋装结构的截面图。
图15是示出现有的荧光体片的胶带密封结构的截面图。
符号说明
10密封胶带、11胶粘层、12气体阻隔层、13粘接层、14支撑膜层、15切口、21第一水蒸气阻隔膜、22第二水蒸气阻隔膜、23荧光体层、31红色荧光体、32绿色荧光体、33刮棒涂布机、34烘箱、35热层压机、36冲压机、41蓝色LED、42导光板、43荧光体片、44光学膜组、51蓝色LED、52基板、53扩散板、60密封胶带、61胶粘层、62气体阻隔层、70密封胶带、71胶粘层、72气体阻隔层、73粘接层、74支撑膜层、80密封胶带、81胶粘层、82气体阻隔层、83粘接层、84支撑膜层、85切口、101第一膜、102第二膜、103密封树脂、121第一水蒸气阻隔膜、122第二水蒸气阻隔膜、123荧光体层、130密封胶带
具体实施方式
以下,针对本发明的实施方式,参考附图按以下顺序进行详细说明。
1.密封胶带
2.荧光体片
3.照明装置
4.实施例
<1.密封胶带>
图1是示出本实施方式的密封胶带的结构的截面图。该密封胶带10将胶粘层11、气体阻隔层12、粘接层13和支撑膜层14以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在支撑膜层14的厚度方向上形成切口15。由此,能够在一定位置上将支撑膜层14折弯,即使在折弯粘贴的情况下,也能够防止上下的宽度偏差、气泡的混入以及褶皱的产生。
另外,可以在宽度方向的大致中心部沿长边方向,在支撑膜层14的整个厚度方向上形成切口15,也可以在宽度方向的大致中心部沿长边方向,在直到粘接层13的厚度方向的中途为止形成切口15。由此,能够将支撑膜层14容易地在一定位置上折弯,能够提高密封作业性。
胶粘层11是粘贴于被粘物的层。作为形成胶粘层11的胶粘剂或者粘着剂,可根据被粘物的材质进行适当选择。例如,能够使用含有以丙烯酸树脂、丙烯酸改性硅树脂化合物、硅改性丙烯酸树脂化合物等为主要成分的粘着剂来形成。
气体阻隔层12作为至少具有对水蒸气和氧气的强的气体阻隔性的层而构成,为具有例如1g/m2/day(40℃/90%RH)以下的水蒸气透过率的基材。气体阻隔层12例如可以为单层的铝,但优选为将铝层、粘接层、基材、粘接层和铝层以该顺序层叠而成。在铝层和支撑膜的伸缩率大的情况下,虽然产生卷曲,但通过对称地层叠铝层,能够抑制卷曲,能够提高密封作业性。
另外,取代铝,气体阻隔层12还可以使用例如二氧化硅、氧化铝等金属氧化物,并将金属氧化物层、粘接层、基材、粘接层和金属氧化物层以该顺序层叠。
粘接层13由例如紫外线固化树脂或热塑性树脂构成,具有良好的透明性,并具有对气体阻隔层12和支撑膜层14的足够的粘着性。紫外线固化树脂或热塑性树脂能够使用已知材料,并不特别限定。作为紫外线固化树脂,例如,可举出由光固化剂聚合而成的丙烯酸树脂、环氧树脂等。作为热塑性树脂,可举出丙烯酸树脂、PS树脂(聚苯乙烯树脂)、AS树脂(苯乙烯-丙烯腈共聚物树脂)、MS树脂(苯乙烯-甲基丙烯酸甲酯共聚物树脂)、SBC树脂(苯乙烯-丁二烯嵌段共聚物树脂)等。这之中,可优选使用透明性优异的热塑性丙烯酸树脂。
另外,优选地,粘接层13含有荧光体。对荧光体不做特别限定,但优选使用耐水性强的YAG系荧光体或氮化物系荧光体。特别是在使用蓝色LED来获得白光的情况下,优选使用(Y,Gd)3(Al,Ga)5O12:Ce(YAG:Ce)等黄色的YAG系荧光体。由此,在将密封胶带用于荧光体片的端部的情况下,能够消除荧光体片的端部附近的蓝色。
为了防止切入到气体阻隔层12,粘接层13的厚度优选在10μm以上且50μm以下。
支撑膜层14由具有弹性的透明的塑料膜构成。作为具体例,能够举出聚酯(聚乙烯对苯二酸酯、聚萘二甲酸乙二酯、聚丁烯对苯二酸酯等)、聚烯(聚乙烯、聚丙烯)、聚芳酯、聚碳酸酯、聚丙烯酸酯、聚醚砜等和这些共聚体的无拉伸膜以及拉伸膜,都可以根据用途进行适当选择。
支撑膜层14的厚度如果太薄则无法得到适度的弹性,如果太厚则增加胶带的厚度,因此优选在10μm以上且50μm以下。
通过由这样的结构构成的密封胶带10,能够使折弯位置一定,因此能够消除在折弯粘贴时的被粘物端部的胶带宽度的偏差。另外,通过最外表面的支撑膜层14的硬度,能够防止气泡的混入,并且能够抑制由被粘物的挠曲所引起的褶皱的产生。另外,由于最外表面是支撑膜层14,因此能够保护气体阻隔层12免受机械损害。
<2.荧光体片>
图2是表示荧光体片的端部的构成例的截面图。该荧光体片具备第一水蒸气阻隔膜21、第二水蒸气阻隔膜22、被第一水蒸气阻隔膜21和第二水蒸气阻隔膜22夹持的荧光体层23、和将第一水蒸气阻隔膜21和第二阻隔膜22的端部密封的上述密封胶带10。
从水蒸气阻隔性或强度的观点出发,粘贴在第一水蒸气阻隔膜21上或第二水蒸气阻隔膜22上的密封胶带10的宽度,优选在1mm~10mm,更优选在4mm~8mm。
通过由这样的结构构成的荧光体片,能够防止水蒸气从水蒸气阻隔膜的端部向荧光体层23侵入,能够防止荧光体层23中的荧光体23a劣化。
第一水蒸气阻隔膜21和第二水蒸气阻隔膜22为具有例如1g/m2/day以下的水蒸气透过率的基材,是在PET(Polyethylene terephthalate:聚对苯二甲酸乙二醇酯)等塑料基板或膜的表面形成了氧化铝、氧化镁、氧化硅等金属氧化物薄膜的气体阻隔性膜。另外,也可以使用PET/SiOx/PET等多层结构的材料。
荧光体层23是将含有粉末状的荧光体23a的树脂组合物进行成膜而成。对于荧光体,不进行特别限定,可以从硫化物系荧光体、氧化物系荧光体、氮化物系荧光体、氟化物系荧光体等中,根据荧光体的种类、吸收谱带、发光谱带等而使用一种或将两种以上组合使用。
作为硫化物系荧光体的具体例,能够举出例如CaS:Eu、SrS:Eu、SrGa2S4:Eu、CaGa2S4:Eu、(Sr,Ca,Ba,Mg)Ga2S4:Eu、(Sr,Ca,Ba)S:Eu、Y2O2S:Eu、La2O2S:Eu、Gd2O2S:Eu等。另外,作为氧化物系荧光体的具体例,能够举出(Ba,Sr)3SiO5:Eu、(Ba,Sr)2SiO4:Eu、Tb3Al5O12:Ce、Ca3Sc2Si3O12:Ce等。另外,作为氮化物系荧光体的具体例,能够举出例如Ca2Si5N8:Eu、Sr2Si5N8:Eu、Ba2Si5N8:Eu、(Ca,Sr,Ba)2Si5N8:Eu、Cax(Al,Si)12(O,N)16:Eu(0<x≤1.5)、CaSi2O2N2:Eu、SrSi2O2N2:Eu、BaSi2O2N2:Eu、(Ca,Sr,Ba)Si2O2N2:Eu、CaAl2Si4N8:Eu、CaSiN2:Eu、CaAlSiN3:Eu等。另外,作为氟化物系荧光体的具体例,能够举出K2TiF6:Mn4+、Ba2TiF6:Mn4+、Na2TiF6:Mn4+、K3ZrF7:Mn4+、K2SiF6:Mn4+等。另外,作为其他的荧光体,能够举出(Y,Gd)3(Al,Ga)5O12:Ce(YAG:Ce)等YAG系荧光体、Lu(Si,Al)12(O,N)16:Eu等塞隆(sialon)系荧光体。应予说明,在荧光体材料的记载中,“:”之前表示母体,“:”之后表示活化剂。
作为为了使用蓝色LED或近紫外LED得到白光而组合的荧光体,能够使用黄色荧光体、黄色荧光体和红色荧光体、绿色荧光体和红色荧光体等。在本实施方式中,可优选使用容易因水蒸气而劣化的硫化物系荧光体、氧化物系荧光体或者它们的混合系荧光体,能够实现广色域。
作为为了使用蓝色LED得到白光而组合的硫化物系荧光体,能够举出由蓝色激发光的照射而具有波长为620~660nm的红色荧光峰的硫化物系荧光体,优选为CaS:Eu、SrS:Eu,或由蓝色激发光的照射而具有波长为530~550nm的绿色荧光峰的硫化物系荧光体,优选为SrGa2S4:Eu。
另外,作为为了使用蓝色LED得到白光而组合的氧化物系荧光体,能够举出通过蓝色激发光的照射而发出波长为590~620nm的红色荧光的氧化物系荧光体,优选为(Ba,Sr)3SiO5:Eu、(Ba,Sr)2SiO4:Eu等。
应予说明,也可以使用除为了使用蓝色LED得到白光而组合的硫化物系荧光体或者氧化物荧光体以外的荧光体,例如可以使用(Y,Gd)3(Al,Ga)5O12:Ce、塞隆荧光体等。
另外,优选地,硫化物系荧光体或者氧化物荧光体的表面被被覆。作为被覆表面所使用的化合物,能够举出氧化硅、氧化钇、氧化铝、或者氧化镧等氧化物。对于这些化合物,可以使用一种或将两种以上组合使用。
在图2所示的单层型的发光体片中,在使用上述的荧光体的混合物作为荧光体的情况下,为了使荧光体片发白光,优选使用通过蓝色激发光的照射而发出波长为620~660nm的红色荧光的硫化物系荧光体或者通过蓝色激发光的照射而发出波长为590~620nm的红色荧光的氧化物系荧光体、与通过蓝色激发光的照射而发出波长为530~550nm的绿色荧光的硫化物系荧光体的混合荧光体。特别优选的组合为发出红色荧光的CaS:Eu或者(BaSr)3SiO5:Eu、与发出绿色荧光的SrGa2S4:Eu的混合荧光体。
在形成荧光体层的树脂组合物中,优选含有聚烯共聚体成分和光固化性(甲基)丙烯酸树脂成分中的任一树脂成分。
作为聚烯共聚体,能举出苯乙烯系共聚体或其氢化物。作为这样的苯乙烯系共聚体或其氢化物,可优选举出苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚体或其氢化物、苯乙烯-乙烯-丙烯嵌段共聚体或其氢化物。在这些中,从透明性或气体阻隔性的方面考虑,可特别优选使用苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚体的氢化物。通过含有这样的聚烯共聚体成分,从而能够获得优异的耐光性和低的吸水性。
作为光固化型丙烯酸酯树脂成分,能举出(甲基)丙烯酸氨基甲酸酯、聚酯(甲基)丙烯酸酯、环氧(甲基)丙烯酸酯等,在这些中,从光固化后的耐热性的观点考虑,可优选使用(甲基)丙烯酸氨基甲酸酯。通过含有这样的光固化型(甲基)丙烯酸酯树脂成分,能够获得优异的耐光性和低的吸水性。
另外,根据需要,在不损害本发明的效果的范围内,可以向树脂组合物混合其他的透光性树脂、着色颜料、溶剂等。
[荧光体片的制造方法]
本实施方式的荧光体片的制造方法为利用第一水蒸气阻隔膜和第二水蒸气阻隔膜夹持荧光体层,并通过上述的密封胶带密封第一水蒸气阻隔膜和第二阻隔膜的端部的方法。
图3是用于说明荧光体片的制造方法的一例的示意图。作为具体例所示的荧光体片的制造方法如图3所示,具有搅拌工序(A)、层压工序(B)、冲裁加工工序(C)和密封工序(D)。
在搅拌工序(A)中,例如在利用溶剂溶解的树脂糊中,以预先确定的配比混合红色荧光体31和绿色荧光体32,得到含荧光体的树脂糊。在层压工序(B)中,在第一水蒸气阻隔膜21上涂布荧光体树脂糊,使用刮棒涂布机(Bar coater)33使荧光体树脂糊的膜厚均匀,并用烘箱34使荧光体树脂糊干燥,从而形成荧光体层23。然后,使用热层压机35将第二水蒸气阻隔膜22贴合在荧光体层23上,得到荧光体层23被第一水蒸气阻隔膜21、第二水蒸气阻隔膜22夹持的荧光体片的原料片材。在冲裁加工工序(C)中,利用冲压机36对荧光体片的原料片材进行冲裁加工,得到在端部侧面露出有荧光体层的规定的尺寸的荧光体片。在密封工序(D)中,使用上述的密封胶带10,粘贴第一水蒸气阻隔膜21的端部和第二水蒸气阻隔膜22的端部,从而密封荧光体层23。
通过以上工序(A)~(D),能够得到第一水蒸气阻隔膜21的端部、第二水蒸气阻隔膜22的端部被密封胶带10粘贴了的荧光体片。
另外,上述的密封胶带不限于荧光体片的制造方法,也能够用于粘贴第一膜和第二膜的端部的密封方法。
<3.照明装置>
图4是表示侧光式的照明装置的示意截面图。如图4所示,照明装置构成所谓的“侧光式背光”,其具备:蓝色LED41、使从侧面射入的蓝色LED41的蓝光扩散并在表面发出均匀的光的导光板42、从蓝光得到白光的荧光体片43以及光学膜组44。
蓝色LED41构成所谓的“LED封装”,其具有例如InGaN系的LED芯片作为发蓝光元件。导光板42使从丙烯酸板等透明基板的端面进入的光均匀地进行面发光。荧光体片43含有从发蓝光元件的蓝光得到白光的粉末状的荧光体。荧光体的粉末使用平均粒径为几μm~几十μm的荧光体粉末。由此能够提高荧光体片43的光散射效果。光学膜组44由例如用于提高液晶显示装置的可视性的反射型偏光膜、扩散膜等构成。
另外,图5是表示直下式的照明装置的示意截面图。如图5所示,照明装置构成所谓的“直下式背光”,其具备:以二维方式配置了蓝色LED51的基板52、使蓝色LED51的蓝光扩散的扩散板53、与基板52分离地配置并从蓝光得到白光的荧光体片43和光学膜组44。
蓝色LED51构成所谓的“LED封装”,其具有例如InGaN系的LED芯片作为发蓝光元件。基板52由利用了苯酚、环氧、聚酰亚胺等树脂的玻璃布基材构成,在基板52上以规定间距等间隔地、并且与荧光体片43的整个面相对应地以二维方式配置蓝色LED51。另外,可以根据需要在基板52上的蓝色LED51的搭载面上实施反射处理。基板52与荧光体片43隔开约10~50mm的程度而配置,照明装置构成所谓的“远程荧光体结构”。基板52与荧光体片43的间隙通过多个支撑柱和/或反射板来保持,并以使支撑柱和/或反射板在四周包围基板52与荧光体片43所形成的空间的方式进行设置。扩散板53将来自蓝色LED51的放射光以分辨不出光源的形状的程度进行大范围地扩散,并具有例如20%以上且80%以下的总透光率。
在这样的结构的照明装置中,荧光体片43由于端部被遮盖部件密封,因此可优选使用容易因水蒸气而劣化的硫化物系荧光体、氧化物系荧光体或者它们的混合系荧光体。
图6是使用了硫化物系荧光体的背光、以及使用了现有的黄色荧光体的背光的光谱。在图6中,a是使用了硫化物系荧光体的背光的光谱,b是使用了现有的黄色荧光体的背光的光谱。
另外,图7是示出使用了使用有硫化物系荧光体的背光、以及使用有现有的黄色荧光体的背光的液晶显示装置的色彩空间的CIE1931色度图。在图7中,a是使用了使用有硫化物系荧光体的背光的液晶显示装置的色彩空间,b是使用了使用有现有的黄色荧光体的背光的液晶显示装置的色彩空间,c是NTSC方式的色彩空间,d是sRGB方式的色彩空间。
使用有硫化物系荧光体的背光使用了如下荧光体片,该荧光体片作为硫化物系荧光体而使用绿色硫化物系荧光体(SrGa2S4:Eu)和红色硫化物系荧光体(CaS:Eu),并分散于苯乙烯-乙烯-丁烯-苯乙烯嵌段(SEBS)树脂中。
在使用了硫化物系荧光体的荧光体片中含有红色硫化物系荧光体,因此如图6所示,使用有硫化物系荧光体的背光的光谱a在650nm附近的强度比使用有黄色荧光体的背光的光谱b在650nm附近的强度大。另外,如图7所示,使用了使用有硫化物系荧光体的背光的液晶显示装置的色彩空间为NTSC方式的色彩空间的85~90%程度的面积比,而与此相对,使用了使用有黄色荧光体的背光的液晶显示装置的色彩空间为NTSC方式的色彩空间的72%左右的面积比。上述面积比由背光光谱和液晶显示装置内的彩色滤光片的光谱透过率的乘积来确定。应指出,根据后者的彩色滤光片的光谱透过率,上述面积比的数值多少有些波动。
这样地使用了硫化物系荧光体的荧光体片能够表现广色域,因此像本实施方式这样,通过遮盖部件密封荧光体片的端部,从而防止水蒸气侵入的技术对于使用了硫化物系荧光体的荧光体片非常有用。另外,通过将具备使用了硫化物系荧光体的荧光体片的照明装置配置于例如成为液晶显示装置的显示画面的液晶面板,不仅实现广色域,还能延长液晶显示装置的使用寿命。
应予说明,本发明不仅限于上述的实施方式,当然,在不脱离本发明的主旨的范围内能够实施各种改进。例如,在上述的实施方式中,示出了将照明装置应用于显示装置用的背光源的例子,但也可以应用于照明用光源。在应用于照明用光源的情况下,不需要光学膜34的情况较多。另外,含荧光体树脂不仅可以为平面的片状,也可以具有杯形形状等立体形状。
实施例
<4.实施例>
以下,举出实施例以具体说明本发明。在本实施例中,制作了结构不同的密封胶带。并且,对于将密封胶带粘贴于荧光体片的边缘部,并进行折弯密封时的胶带宽度的偏差、气泡的混入以及褶皱的产生进行了评价。应予说明,本发明不限于这些实施例。
荧光体片使用了利用厚度为40μm的水蒸气阻隔膜来夹持荧光体层的65英制尺寸(1450mm×820mm)的荧光体片。荧光体片的厚度为大约130μm。
另外,对于胶带宽度的偏差、气泡的混入以及褶皱的产生的评价,按如下进行。
[胶带宽度的偏差的评价]
使用大约6mm宽的密封胶带,将荧光体片的端部密封。并且,测定荧光体片的边缘部的胶带宽度,并对正反面的胶带宽度的偏差进行了评价。将胶带宽度在3±0.5mm以内的情况评价为“○”,将胶带宽度超过3±0.5mm的情况评价为“×”。
[气泡的混入的评价]
使用大约6mm宽的密封胶带,将荧光体片的端部密封。并且,观察密封胶带,将混入的气泡不足1mm2的情况评价为“○”,将混入的气泡在1mm2以上的情况评价为“×”。
[褶皱的产生的评价]
使用大约6mm宽的密封胶带,将荧光体片的端部密封。并且,在折弯荧光体片之后观察密封胶带,将没有产生褶皱的情况评价为“○”,将产生褶皱的情况评价为“×”。
<比较例一>
图8是示出比较例一的胶带结构的示意截面图。比较例一的密封胶带60由胶粘层61和气体阻隔层62构成。胶粘层61是大约25μm厚的丙烯酸系胶粘层。气体阻隔层61是将大约7μm厚的铝层621、大约3μm厚的粘接层622、大约12μm厚的PET膜623、大约3μm厚的粘接层624和大约7μm厚的铝层625以该顺序层叠而成。
将比较例一的胶带结构体切割(slit)为大约6mm宽的尺寸,并作为比较例一的密封胶带。使用比较例一的密封胶带将荧光体片的端部密封。
如表1所示,比较例一的胶带宽度的偏差的评价为×、气泡的混入的评价为×、以及褶皱的产生的评价为×。比较例一的密封胶带难以明确地确定折弯位置,如图9所示,正反面的胶带宽度W1、W2产生了较大的偏差。另外,由于比较例一的密封胶带柔软,因此如图10所示,产生了气泡60a的混入。另外,在折弯荧光体片的情况下,由于荧光体片的挠曲,在胶带部产生了褶皱。
[比较例二]
图11是示出比较例二的胶带结构的示意截面图。比较例二的密封胶带70由胶粘层71、气体阻隔层72、粘接层73和支撑膜层74构成。胶粘层71为大约25μm厚的丙烯酸系胶粘层。气体阻隔层72是将大约7μm厚的铝层721、大约3μm厚的粘接层722、大约12μm厚的PET膜723、大约3μm厚粘接层724和大约7μm厚的铝层725以该顺序层叠而成。粘接层73由大约25μm厚的热塑性树脂层构成。支撑膜层74由大约25μm厚的PET膜构成。
将比较例二的胶带结构体切割为大约6mm宽的尺寸,并作为比较例二的密封胶带。使用比较例二的密封胶带将荧光体片的端部密封。
如表1所示,无法对比较例二的胶带宽度的偏差、气泡的混入以及褶皱的产生进行评价。比较例二的密封胶带由于支撑膜层74的PET膜比较硬,因此不能如图12所示那样折弯,但粘贴密封胶带的部分既没有混入气泡也没产生褶皱。
[实施例一]
图13是示出实施例一的胶带结构的示意截面图。实施例一的密封胶带80由胶粘层81、气体阻隔层82、粘接层83和支撑膜层84构成。胶粘层81为大约25μm厚的丙烯酸系胶粘层。气体阻隔层81是将大约7μm厚的铝层821、大约3μm厚的粘接层822、大约12μm厚的PET膜823、大约3μm厚的粘接层824和大约7μm厚的铝层825以该顺序层叠而成。粘接层83由大约25μm厚的热塑性树脂层构成。支撑膜层84由大约25μm厚的PET膜构成。
将实施例一的胶带结构体切割成大约6mm宽的尺寸之后,在密封胶带的中心部进行半切割(half-cut)。具体来说,在最外表面的25μm的PET膜和直到粘接层的中途为止形成切口。将此作为实施例的密封胶带,并使用该密封胶带将荧光体片的端部密封。
如表1所示,实施例一的胶带宽度的偏差的评价为○、气泡的混入的评价为○、以及褶皱的产生的评价为○。实施例一的密封胶带通过在支撑膜层84的PET膜形成切口,能够明确地确定折弯位置,因此在被粘物的正反面,胶带宽度没有产生大的偏差。另外,实施例一的密封胶带,由于支撑膜层84的PET膜比较硬,因此没有产生气泡的混入。另外,由于支撑膜层的PET膜比较硬,因此即使在将荧光体片折弯的情况下,在胶带部也没产生褶皱。
[表1]
胶带宽度的偏差 | 气泡的混入 | 褶皱的产生 | |
比较例一 | × | × | × |
比较例二 | ─ | ─ | ─ |
实施例一 | ○ | ○ | ○ |
Claims (18)
1.一种密封胶带,其特征在于,所述密封胶带是将胶粘层、气体阻隔层、粘接层、支撑膜层以该顺序层叠,
并在宽度方向的大致中心部沿长边方向,在所述支撑膜层的厚度方向上形成切口而成。
2.根据权利要求1所述的密封胶带,其特征在于,所述密封胶带是在宽度方向的大致中心部沿长边方向,在所述支撑膜层的整个厚度方向上形成切口而成。
3.根据权利要求2所述的密封胶带,其特征在于,所述密封胶带是在宽度方向的大致中心部沿长边方向,在直到所述粘接层的厚度方向的中途为止形成切口而成。
4.根据权利要求1至3中任一项所述的密封胶带,其特征在于,所述气体阻隔层是将铝层、粘接层、基材、粘接层、铝层以该顺序层叠而成。
5.根据权利要求1至3中任一项所述的密封胶带,其特征在于,所述气体阻隔层是将金属氧化物层、粘接层、基材、粘接层、金属氧化物层以该顺序层叠而成。
6.根据权利要求1至3中任一项所述的密封胶带,其特征在于,所述粘接层含有荧光体。
7.根据权利要求1至3中任一项所述的密封胶带,其特征在于,所述支撑膜层包括聚酯、聚烯、聚芳酯、聚碳酸酯、聚丙烯酸酯、聚醚砜中的至少一个。
8.根据权利要求1至3中任一项所述的密封胶带,其特征在于,所述支撑膜层的厚度为10μm以上且50μm以下。
9.根据权利要求1至3中任一项所述的密封胶带,其特征在于,所述粘接层的厚度为10μm以上且50μm以下。
10.一种荧光体片,其特征在于,具备:
第一水蒸气阻隔膜;
第二水蒸气阻隔膜;
荧光体层,被所述第一水蒸气阻隔膜和所述第二水蒸气阻隔膜夹持;以及
密封胶带,密封所述第一水蒸气阻隔膜和所述第二阻隔膜的端部,
其中,所述密封胶带是将胶粘层、气体阻隔层、粘接层、支撑膜层以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在所述支撑膜层的厚度方向上形成切口而成。
11.根据权利要求10所述的荧光体片,其特征在于,所述密封胶带的粘接层含有荧光体。
12.根据权利要求11所述的荧光体片,其特征在于,
所述荧光体层含有从蓝光获得白光的荧光体,
所述荧光体含有黄色荧光体。
13.根据权利要求10至12中任一项所述的荧光体片,其特征在于,
所述荧光体层含有硫化物系荧光体。
14.根据权利要求13所述的荧光体片,其特征在于,所述荧光体层含有红色荧光体和绿色荧光体。
15.一种照明设备,其特征在于,具备权利要求10至12中任一项所述的荧光体片。
16.一种液晶显示装置,其特征在于,具备权利要求10至12中任一项所述的荧光体片。
17.一种荧光体片的制造方法,其特征在于,
在利用第一水蒸气阻隔膜和第二水蒸气阻隔膜夹持荧光体层,并利用密封胶带粘贴所述第一水蒸气阻隔膜和所述第二阻隔膜的端部的荧光体片的制造方法中,
所述密封胶带是将胶粘层、气体阻隔层、粘接层、支撑膜层以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在所述支撑膜层的厚度方向上形成切口而成。
18.一种密封方法,其特征在于,
在利用密封胶带粘贴第一膜和所述第二膜的端部的密封方法中,
所述密封胶带是将胶粘层、气体阻隔层、粘接层、支撑膜层以该顺序层叠,并在宽度方向的大致中心部沿长边方向,在所述支撑膜层的厚度方向上形成切口而成。
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WO2015125432A1 (ja) | 2015-08-27 |
CN106029806B (zh) | 2019-12-10 |
TW201533211A (zh) | 2015-09-01 |
US9957421B2 (en) | 2018-05-01 |
EP3109289B1 (en) | 2018-10-10 |
EP3109289A1 (en) | 2016-12-28 |
TWI661024B (zh) | 2019-06-01 |
JP2015157889A (ja) | 2015-09-03 |
EP3109289A4 (en) | 2017-08-09 |
JP5820894B2 (ja) | 2015-11-24 |
US20170009109A1 (en) | 2017-01-12 |
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