CN109983373A - 光转换部件 - Google Patents
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Abstract
本发明提供即使形成阻挡层也能够得到高输出亮度的光转换部件。具体而言,该光转换部件具有:光转换膜,将光的颜色从规定颜色进行转换;第1阻气部,位于光转换膜的待转换的光入射的面侧,由防止水分、气体向光转换膜渗入的一层以上的阻气层构成;和第1基材,位于第1阻气部的与光转换膜所处的面相反的面侧,透光并保持光转换膜和第1阻气部,该光转换部件具备具有下述特征的第1阻气部:对于规定颜色的光,第1基材与第1阻气部两者的组合体的透光率高于第1基材的透光率。
Description
技术领域
本发明涉及具有阻挡膜的光转换部件,涉及提高透光性、提高输出光量的光转换部件。进一步,本发明还涉及包含具有该阻挡膜的光转换部件的显示装置。
背景技术
近年来,随着液晶显示器中色彩重现性的提高(色域的扩大),量子点作为光转换材料受到关注。蓝色的光从背光源入射至包含量子点的光转换膜时,被尺寸不同的2种量子点转换为红色光和绿色光放出。并且,此时,能够与未被转换就通过的蓝色光合并形成具有尖锐峰的RGB光源,预期可实现色域的大幅扩大。
但是,量子点具有与水分、氧接触时因光氧化反应而导致发光强度降低的问题。
专利文献1中记载了下述构成:为了保护量子点免受水分或氧的影响,在包含量子点的光转换膜上层积、粘接阻挡膜。
现有技术文献
专利文献
专利文献1:日本特开2015-65158号公报
发明内容
发明所要解决的课题
在专利文献1的构成中,若无计划地形成阻挡层,则有可能如图2所示那样使透光率降低。
图2中,虚线为无计划地形成了阻挡层的基材的单基材与阻挡层的组合体的透光率,实线为形成阻挡层之前的单基材的透光率,显示出在450nm附近至750nm附近的光波长范围内,单基材与阻挡层的组合体的透光率低于单基材的透光率。
鉴于上述问题,本发明的目的在于提供即使形成阻挡层也能够得到高输出亮度的光转换部件。
用于解决课题的手段
为了解决上述课题,本发明提供一种光转换部件,其具有:光转换膜,将光的颜色从规定颜色进行转换;第1阻气部,位于上述光转换膜的待转换的光入射的面侧,由防止水分、气体向上述光转换膜中渗入的一层以上的阻气层构成;和第1基材,位于上述第1阻气部的与上述光转换膜所处的面相反的面侧,透光,并对上述光转换膜和上述第1阻气部进行保持,该光转换部件使用了具有下述特征的上述第1阻气部:对于上述规定颜色的光,上述第1基材与上述第1阻气部两者的组合体的透光率高于上述第1基材的透光率。
通过在入射侧使用具有上述特征(即,对于规定颜色的光,上述第1基材与上述第1阻气部两者的组合体的透光率高于上述第1基材的透光率)的阻气部,待由光转换膜进行转换的入射光的光量提高,经光转换膜转换出的光量也提高,可得到高输出亮度。
在上述光转换部件中,也可以具有:第2阻气部,位于上述光转换膜的经转换的光被输出的面侧,由防止水分、气体向上述光转换膜渗入的一层以上的阻气层构成;和第2基材,位于上述第2阻气部的与上述光转换膜所处的面相反的面侧,透光,对上述光转换膜和上述第2阻气部进行保持,该光转换部件可以使用具有下述特征的上述第2阻气部:至少对于红色、绿色、蓝色的光,上述第2基材与上述第2阻气部两者的组合体的透光率高于上述第2基材的透光率。
特别是在红色、绿色、蓝色的光较强地从光转换膜输出的情况下,能够将这些光的光量的降低限制在最低限度,可得到更高的输出亮度。
上述光转换膜可以使用包含量子点或荧光体的树脂,上述规定颜色的光可以为蓝色。
通过提高阻气部对蓝色光的透光率,使用将蓝色光转换为其他颜色的量子点或荧光体的光转换部件可得到高输出亮度。
可以将本发明的光转换部件用于显示器中。
通过将本发明的光转换部件用于显示器中,可得到高输出亮度。
附图说明
图1(A)是对本发明的实施例1中的光转换部件的简略构成进行说明的图,图1(B)是对本发明的实施例2中的光转换部件的简略构成进行说明的图。
图2是示出现有的单基材的透光率以及基材与阻气部两者的组合体的透光率的图。
图3是示出本发明的实施例1中的基材以及基材与阻气部两者的组合体的透光率的一例的图。
图4是示出本发明的实施例2中的基材以及基材与阻气部两者的组合体的透光率的一例的图。
具体实施方式
下面对本发明的实施方式进行说明。
[实施例1]
参考图1(A)对本发明的实施例1进行说明。图1(A)是对本发明的实施例1中的光转换部件的简略构成进行说明的图。
如图1(A)所示,光转换部件3具备:光转换膜4,对入射光1的规定颜色的光进行光转换,以输出光2输出;阻气部5,位于入射光1侧,由防止水分、气体向光转换膜4渗入的一层以上的阻气层构成;和基材6,位于阻气部5的入射光1侧,对光转换膜4和阻气部5进行保持。
光转换膜4包含量子点、荧光体等,例如将蓝色的光转换为红色、绿色的光。但是,由于水分、气体的渗入,光转换率会降低,因此利用阻气部5来进行阻挡。
构成阻气部5的阻气层例如由SiCN、SiO2等透光的无机物构成。在阻气层为多层的情况下,有时设置有具有改善层积面的平滑性或提高阻气层间的密合力的性质的层(中间层),本实施例中所定义的阻气层也包含中间层。
各阻气层的材质可以不同,也可以相同。另外,各阻气层的厚度可以不同,也可以相同。
另外,构成阻气部5的阻气层可以为一层以上,对于层积数没有限定。在入射光1侧的阻气部5按照形成如图3所示那样的使规定颜色的透光率大于其他颜色的透光率而具有波峰的分布的方式具有突出特征的情况下,优选以2层以上的阻气层构成阻气部5。
基材6优选为透明性高的膜。例如,可以为PEN、PET等的膜,也可以不同。
阻气部5中,按照下述方式对形成阻气部5的阻气层进行了调整:对于蓝色的光(波长),基材6与阻气部5两者的组合体的透光率高于单基材6的透光率。
作为用于与本发明进行比较的一例,将单基材6的透光率、以及基材6与未对构成阻气部5的阻气层进行调整的阻气部5两者的组合体的透光率示于图2。
将图2中使用的基材和构成阻气部的阻气层的构成示于表1。按照表1中从阻气层1到阻气层6的数字的顺序的配置来形成,与基材较近的为阻气层6
[表1]
材质 | 厚度 | |
阻气层1 | SiO2 | 30.00nm |
阻气层2 | SiCN | 30.00nm |
阻气层3 | SiO2 | 30.00nm |
阻气层4 | SiCN | 30.00nm |
阻气层5 | SiO2 | 30.00nm |
阻气层6 | SiCN | 30.00nm |
基材 | PET | 100μm |
在图2所示的示例中,在单基材6上追加阻气部5时,基材6与阻气部5的组合体的透光率降低。
与此相对,本发明中使用的阻气部5按照基材6与阻气部5两者的组合体对规定颜色的光(波长)的透光率高于单基材6对该规定颜色的光(波长)的透光率的方式来选择形成阻气部5的阻气层的光折射率,并调整了阻气层的厚度。
在此,在使基材6与阻气部5的组合体对单色的透光率高于单基材6对该单色的透光率的情况下,能够得到比提高可见光整体的透射率时更高的透射率,能够增大效果。
特别是在向光转换膜入射的光为单色的情况下,可以按照与该入射光的颜色相应地具有透射率的峰的方式形成阻气部。
作为一例,在图3中示出使用了按照基材6与阻气部5的组合体对400nm附近的波长的光(蓝色光)的透光率提高的方式对构成阻气部5的阻气层进行了调整的阻气部5的示例。
在此,图3中,虚线为按照下述方式形成了阻气层的基材:与其他颜色的透光率相比,在400nm附近的波长的光(蓝色光)下,单基材与阻气层的组合体的透光率达到最大;实线为形成阻气层之前的单基材。
将图3中使用的基材和构成阻气部的阻气层的构成示于表2。按照表2中从阻气层1至阻气层6的数字的顺序的配置来形成,与基材较近的为阻气层6。
[表2]
材质 | 厚度 | |
阻气层1 | SiO2 | 50.00nm |
阻气层2 | SiCN | 10.68nm |
阻气层3 | SiO2 | 20.00nm |
阻气层4 | SiCN | 49.03nm |
阻气层5 | SiO2 | 48.83nm |
阻气层6 | SiCN | 10.14nm |
基材 | PET | 100μm |
通过使用对阻气层进行了调整的阻气部5,实现了使基材6与阻气部5组合时对规定颜色的透光率高于单基材6对该规定颜色的透光率。
通过在光转换膜4的入射侧使用具有下述特征的阻气部5:基材6与阻气部5两者的组合体对规定颜色的光的透光率高于单基材6对该规定颜色的光的透光率,即使是相同光量的入射光1,与不使用阻气部5而使用单基材6的情况相比,到达光转换膜4的待进行光转换的光量也提高,由此经光转换膜4转换后的光量也提高,可得到高输出亮度。另外,在与以往相同的输出亮度的情况下,电力消耗减少。
[实施例2]
参考图1(B)对本发明的实施例2进行说明。图1(B)是对本发明的实施例2中的光转换部件的简略构成进行说明的图。
如图1(B)所示,光转换部件3具备:光转换膜4,对入射光1的规定颜色的光进行光转换,以输出光2输出;阻气部5,位于入射光1侧,由防止水分、气体向光转换膜4渗入的一层以上的阻气层构成;和基材6,位于阻气部5的入射光1侧,对光转换膜4和阻气部5进行保持。
另外,在光转换膜4的输出光2侧具备阻气部7,由防止水分、气体向光转换膜4渗入的一层以上的阻气层构成;在光转换膜4的输出侧具备基材8,对光转换膜4和阻气部7进行保持。
与实施例1同样,光转换膜4包含量子点、荧光体等,例如将蓝色的光转换为红色、绿色、蓝色的光。但是,由于水分、气体的渗入,光转换率会降低,因此利用阻气部5和阻气部7来进行阻挡。
与实施例1同样,构成阻气部5、阻气部7的阻气层例如由SiCN、SiO2等透光的无机物构成。在阻气层为多层的情况下,有时设置有具有改善层积面的平滑性或提高阻气层间的密合力的性质的层(中间层),本实施例中所定义的阻气层也包含中间层。
各阻气层的材质可以不同,也可以相同。另外,各阻气层的厚度可以不同,也可以相同。
另外,构成阻气部5的阻气层可以为一层以上,对于层积数没有限定。在入射光1侧的阻气部5按照形成如图3所示那样的使规定颜色的透光率大于其他颜色的透光率而具有波峰的分布的方式具有突出特征的情况下,优选以2层以上的阻气层构成阻气部5。
基材6、基材8优选为透明性高的膜。例如,可以为PEN、PET等的膜,也可以不同。另外,基材6与基材8的材质或厚度可以相同,也可以不同。
本发明中使用的阻气部5按照基材6与阻气部5两者的组合体对规定颜色的光(波长)的透光率高于单基材6对该规定颜色的光(波长)的透光率的方式来选择形成阻气部5的阻气层的光折射率,并调整了阻气层的厚度。
本发明中使用的阻气部7按照至少对于红色、绿色、蓝色的光(波长)来说基材8与阻气部7两者的组合体的透光率高于单基材8的透光率的方式来选择形成阻气部7的阻气层的光折射率,并调整了阻气层的厚度。
作为一例,在图4中示出使用了下述阻气部7的示例:将基材8设定为与图3中所示的示例相同的材质和相同的厚度,按照基材8与阻气部7的组合体对可见光的透光率提高的方式对构成阻气部7的阻气层进行了调整。
在此,图4中,虚线为按照下述方式形成了阻气层的基材:在可见光的范围内,单基材与阻气层的组合体的透光率高于单基材的透光率;实线为形成阻气层之前的单基材。
将图4中使用的基材和构成阻气部的阻气层的构成示于表3。
按照表3中从阻气层1至阻气层6的数字的顺序的配置来形成,与基材较近的为阻气层6。
[表3]
材质 | 厚度 | |
阻气层1 | SiO2 | 50.32nm |
阻气层2 | SiCN | 8.64nm |
阻气层3 | SiO2 | 30.27nm |
阻气层4 | SiCN | 50.26nm |
阻气层5 | SiO2 | 9.78nm |
阻气层6 | SiCN | 44.89nm |
基材 | PET | 100μm |
通过使用对阻气层进行了调整的阻气部7,实现了使基材8与阻气部7组合时对可见光的透光率高于单基材8对可见光的透光率。
通过使用该光转换部件3,与不使用该光转换部件3而使用单基材6的情况相比,即使是相同光量的入射光1,到达光转换膜4的规定光的光量也提高,由此经光转换膜4转换后的光量也提高。另外,输出侧的透光率也提高,因此输出光2的光量也进一步提高,可得到更高的输出亮度。另外,在与以往相同的输出亮度的情况下,电力消耗进一步减少。
实施例2中,在入射光1使用由蓝色LED等照射的蓝色光的波长范围突出的蓝色光、并使用包含量子点的光转换膜作为光转换膜4的情况下,输出侧的阻气部7使用具有下述特征的阻气部7更为有效:特别是对于红色、绿色、蓝色的光,基材8与阻气部7两者的组合体的透光率高于单基材8的透光率。
特别地,为了将由蓝色LED等照射的蓝色的光分别光转换成使各色光的波长的范围突出的红色、绿色的光,包含量子点的光转换膜优选具有下述特性:阻气部7与基材8两者组合得到的透光率在这些光的情况下形成峰。由此,能够利用该光转换膜4输出更高亮度的红色、绿色、蓝色的光。
另外,在实施例2的构成中,在入射光1使用由蓝色LED等照射的蓝色光、并使用包含将蓝色转换成白色光的黄色荧光体的光透射膜作为光转换膜4的情况下,输出侧的阻气部7使用具有下述特征的阻气部7更为有效:如图4那样,基材8与阻气部7两者的组合体的透光率在整个可见光范围内平衡良好且高于单基材8的透光率。
可以将本发明的光转换部件用于显示器中。
通过将本发明的光转换部件用于显示器中,可得到高输出亮度,能够扩大色域。另外,在与以往相同的输出亮度的情况下,能够减少电力消耗。
利用以上的光转换部件,即使形成阻挡层,也能够得到高输出亮度。
在此,本发明的光转换部件不限于以上说明的方式,可以为本发明范围内的其他方式。例如,本发明的规定颜色也可以还包含例如紫外光等可见光范围以外的光。
符号的说明
1入射光
2输出光
3光转换部件
4光转换膜
5阻气部
6基材
7阻气部
8基材
Claims (4)
1.一种光转换部件,其具有:
光转换膜,将光的颜色从规定颜色进行转换;
第1阻气部,位于所述光转换膜的待转换的光入射的面侧,由防止水分、气体向所述光转换膜中渗入的一层以上的阻气层构成;和
第1基材,位于所述第1阻气部的与所述光转换膜所处的面相反的面侧,透光并保持所述光转换膜和所述第1阻气部,
该光转换部件使用了具有下述特征的所述第1阻气部:
对于所述规定颜色的光,所述第1基材与所述第1阻气部两者的组合体的透光率高于所述第1基材的透光率。
2.如权利要求1所述的光转换部件,其中,
该光转换部件具有:
第2阻气部,位于所述光转换膜的经转换的光的输出的面侧,由防止水分、气体向所述光转换膜渗入的一层以上的阻气层构成;和
第2基材,位于所述第2阻气部的与所述光转换膜所处的面相反的面侧,透光并保持所述光转换膜和所述第2阻气部,
该光转换部件使用了具有下述特征的所述第2阻气部:
至少对于红色、绿色、蓝色的光,所述第2基材与所述第2阻气部两者的组合体的透光率高于所述第2基材的透光率。
3.如权利要求1或2所述的光转换部件,其中,
所述光转换膜使用包含量子点或荧光体的树脂,
所述规定颜色的光为蓝色。
4.一种显示器,其具有权利要求1至3中任一项所述的光转换部件。
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