CN114895492A - 量子点扩散板及其制备方法 - Google Patents
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Abstract
本发明公开了一种量子点扩散板,包括量子点层,所述量子点层的上表面和下表面均覆盖有防护层;所述量子点层各个原料的质量百分比为:塑料原料90‑99%、稳定剂0.01‑1%、有机硅0.1‑3%、无机扩散剂0.1‑3%、扩散油0.1‑3%、苯乙烯‑丁二烯共聚物0.1‑2%、硅酸镁盐类矿物0.1‑6%、量子点0.01‑1%、钛白粉0.2‑5%;所述防护层的各个原料质量百分比为:塑料原料90‑99%、稳定剂0.01‑1%、有机硅0.1‑3%、无机扩散剂0.1‑3%、扩散油0.1‑3%、苯乙烯‑丁二烯共聚物0.1‑2%、硅酸镁盐类矿物0.1‑6%。本发明提供了一种量子点扩散板,具有高亮度的效果,从而减低背光模组整体的成本。本发明还提供了一种量子点扩散板的制备方法。
Description
技术领域
本发明涉及光扩散板技术领域,尤其涉及一种量子点扩散板及其制备方法。
背景技术
光扩散板是通过化学或物理的手段,利用光线在行径途中遇到两个折射率相异的介质时,发生折射、反射与散射的物理现象,通过在PMMA、PC、PS、PP等基材基础中添加无机或有机光扩散剂、或者通过基材表面的微特征结构的阵列排列人为调整光线、使光线发生不同方向的折射、反射、与散射,从而改变光的行进路线,实现入射光充分散色以此产生光学扩散的效果,光扩散板广泛应用在液晶显示、LED照明及成像显示***中。
目前市场上对于TV应用的背光模组而言,由于行业背光均匀度要求的不断提升,导致了扩散板雾度越做越高,但是实现高雾度的同时,扩散板本身的透光率却会有所下降,扩散般的亮度会有所损失,这就要求背光模组需要增加更多的灯珠或者膜片来提升亮度,最终导致背光模组整体成本的增加。
发明内容
本发明的目的在于提供一种量子点扩散板及其制备方法,具有高亮度的效果,从而减低背光模组整体的成本。
本发明公开的量子点扩散板及其制备方法所采用的技术方案是:
一种量子点扩散板,一种量子点扩散板,其特征在于,包括量子点层,所述量子点层的上表面和下表面均覆盖有防护层;
所述量子点层各个原料的质量百分比为:塑料原料90-99%、稳定剂0.01-1%、有机硅0.1-3%、无机扩散剂0.1-3%、扩散油0.1-3%、苯乙烯-丁二烯共聚物0.1-2%、硅酸镁盐类矿物0.1-6%、量子点0.01-1%、钛白粉0.2-5%;
所述防护层的各个原料质量百分比为:塑料原料90-99%、稳定剂0.01-1%、有机硅0.1-3%、无机扩散剂0.1-3%、扩散油0.1-3%、苯乙烯-丁二烯共聚物0.1-2%、硅酸镁盐类矿物0.1-6%。
作为优选方案,所述量子点的粒径为2-12nm。
作为优选方案,所述量子点层数量至少为一层。
作为优选方案,所述量子点层和防护层的塑料原料为ps、pc、pmma或ms中的一种或多种组合。
作为优选方案,所述量子点层和防护层的原料均增加有PS耐热剂,所述PS耐热剂的质量百分比为:0.1-3%。
一种权利要求1量子点扩散板制备方法,包括以下步骤:
准备两份相同成分的防护层原料以及一份量子点层的原料;
将防护层原料和量子点层原料分别进行混合均匀;
将混合好的防护层原料和量子点层原料分别加入螺杆挤出设备进行加热,形成熔融状态;
最后通过螺杆挤出设备的摸头挤出,将防护层原料和量子点层原料以片状的方式挤出,所述防护层覆盖于量子点层表面。
作为优选方案,所述螺杆挤出设备包括三段加热区域,所述加热区域第一段温度为140-220℃,所述加热区域第二段温度为160-240℃,所述加热区域第三段温度为180-260℃。
作为优选方案,所述模头挤出的温度控制范围为140-220℃。
作为优选方案,所述螺杆挤出设备设有若干个进料口,可适用多种不同原料放入螺杆挤出设备中。
本发明公开的量子点扩散板的有益效果是:在量子点层的上下表面均覆盖防护层,且防护层同样采用塑料原料、无机扩散剂及其他材料组成,从而使防护层具有光扩散的功能,同时又能给对量子点层起到防护的这样,阻止水氧进入量子点层中,避免量子点层中的量子点失效;而量子点层采用量子点、钛白粉和其他材料进行组成,通过增加钛白粉,使钛白粉中的钛元素提升量子点扩散板的扩散效果,对原先背光中被滤部分光的转换,提高了背光的利用率,并且通过对钛与量子点原料组分的调节,可以实现扩散板内量子点光谱的改变,从而可以对不同的背光灯条进行匹配,大大增强了量子点扩散板的适用灵活度,同时通过提高亮度,也减低背光模组整体的成本。
附图说明
图1是本发明量子点扩散板的结构示意图。
图2是普通扩散板模组光谱图。
图3是量子点扩散板模组光谱图。
图4是LCD光谱图。
图5是本发明量子点扩散板制备方法的工艺流程图。
具体实施方式
下面结合具体实施例和说明书附图对本发明做进一步阐述和说明:
请参考图1,一种量子点扩散板,包括量子点层10,量子点层10的上表面和下表面均覆盖有防护层20。
量子点层10各个原料的质量百分比为:塑料原料90-99%、稳定剂0.01-1%、有机硅0.1-3%、无机扩散剂0.1-3%、扩散油0.1-3%、苯乙烯-丁二烯共聚物0.1-2%、硅酸镁盐类矿物0.1-6%、量子点0.01-1%、钛白粉0.2-5%。
防护层20的各个原料质量百分比为:塑料原料90-99%、稳定剂0.01-1%、有机硅0.1-3%、无机扩散剂0.1-3%、扩散油0.1-3%、苯乙烯-丁二烯共聚物0.1-2%、硅酸镁盐类矿物0.1-6%。
在量子点层10的上下表面均覆盖防护层20,且防护层20同样采用塑料原料、无机扩散剂及其他材料组成,从而使防护层20具有光扩散的功能,同时又能给对量子点层10起到防护的这样,阻止水氧进入量子点层10中,避免量子点层10中的量子点失效。
而量子点层10采用量子点、钛白粉和其他材料进行组成,通过增加钛白粉,使钛白粉中的钛元素提升量子点扩散板的扩散效果,对原先背光中被滤部分光的转换,提高了背光的利用率,并且通过对钛与量子点原料组分的调节,可以实现扩散板内量子点光谱的改变,从而可以对不同的背光灯条进行匹配,大大增强了量子点扩散板的适用灵活度,同时通过提高亮度,也减低背光模组整体的成本。
上述方案中,量子点的粒径为2-12nm,采用较小的量子点能够使量子点与钛白粉能够更加均匀的混合在一起,起到更好地提高量子点扩散板的扩散效果。且量子点层10的数量至少为一层,在实际生产过程中,可根据不同规格的需求,增加量子点层10的数量,或者是将量子点层10与其他的功能层进行组合使用。
量子点层10和防护层20的塑料原料为ps、pc、pmma或ms中的一种或多种组合。且量子点层10和防护层20的原料均增加有PS耐热剂,PS耐热剂的质量百分比为:0.1-3%。提高添加PS耐热剂提高量子点扩散板主体的耐热性能,避免在使用过程中,因为LED灯在照射时,温度过高,造成量子点扩散板发生形变的情况。
实施例1的量子点扩散板中,各层配方分别为:量子点层各个原料的质量百分比为:塑料原料90%、稳定剂0.5%、有机硅1%、无机扩散剂2%、扩散油1%、苯乙烯-丁二烯共聚物0.5%、硅酸镁盐类矿物2%、量子点0.5%、钛白粉2.5%;
防护层的各个原料质量百分比为:塑料原料93%、稳定剂0.5%、有机硅1%、无机扩散剂2%、扩散油1%、苯乙烯-丁二烯共聚物0.5%、硅酸镁盐类矿物2%。
现有普通扩散板的质量百分比为:塑料原料93%、稳定剂0.5%、有机硅1%、无机扩散剂2%、扩散油1%、苯乙烯-丁二烯共聚物0.5%、硅酸镁盐类矿物2%。
将实施例1的量子点扩散板和普通扩散板均设置在LED模组:55inch/1*24颗灯的条件下:正确组装并放置背光源,打开电源开关,检查无误后,预热30min,板材放置在背光源上方正中央,且位于BEF 下方的固定测试区,使用校正后的亮度计进行测量,并记录亮度色坐标(x,y)和亮度Lv数据,所测量的数值如下表1:
表1:普通扩散板和量子点扩散板五个不同位置的数据表格
表2:量子点扩散板对比普通扩散板的五个位置数值提升类
位置a/A | 位置b/B | 位置c/C | 位置d/D | 位置e/E | 平均 | |
色点X | 7%↑ | 7%↑ | 7%↑ | 8%↑ | 7%↑ | 7%↑ |
色点Y | 13%↑ | 13%↑ | 14%↑ | 13%↑ | 13%↑ | 13%↑ |
亮度LV | 10%↑ | 12%↑ | 11%↑ | 8%↑ | 10%↑ | 10%↑ |
彩色分析仪 | 6%↑ | 6%↑ | 6%↑ | 6%↑ | 6%↑ | 6%↑ |
其中,上述量子点扩散板和普通扩散板所采样的五个位置均位于板材的相同位置,分别是板材对应的四个角及四个角交叉连线的焦点位置。
请参考图2、图3及图4,图2为普通扩散板的光谱图,图3为量子点扩散板的光谱图,根据图2和图3的对比可明显看出,在图3中,有三个波峰且在黄光区中被量子点吸收转换成红光,从而产生更好地发光效果,而普通扩散板的光在黄光区的光谱都被吸收了,导致光利用率低。而图4为量子点扩散板安装在液晶显示屏上的光谱图,结合图3,可看出量子点扩散板在液晶显示屏上能够有更好地色彩表现。
量子点扩散板背光光谱数据如下:
蓝光波峰450nm半峰宽430~450nm与普通背光区别不大;
绿光波峰530nm半峰宽520~550nm;
红光波峰630nm半峰宽610~640nm。
从而可知量子点扩散板相比普通扩散板的亮度LV提升约10%,色域提升约6%。
请参考图5,一种上述量子点扩散板制备方法,包括以下步骤:
准备两份相同成分的防护层原料以及一份量子点层的原料;
将防护层原料和量子点层原料分别进行混合均匀;
将混合好的防护层原料和量子点层原料分别加入螺杆挤出设备进行加热,形成熔融状态;
最后通过螺杆挤出设备的摸头挤出,将防护层原料和量子点层原料以片状的方式挤出,防护层覆盖于量子点层表面。
利用量子点材料原位生长的特点,结合量子点扩散板挤出的制造方式,直接在原料中加入钛白粉,使钛白粉在后续的混合、加热熔融的过程中,钛白粉与量子点层能够均匀进行混合,从而在不增加额外工序、不增加生产成本的同时,将钛白粉中的钛元素材料添加到量子点扩散板中。
并且相比传统的表面额外贴合量子点膜的工艺,原位共挤出的制造方式,不仅可以实现量子点材料更为均匀的分散,提高光转换的效率,而且这项技术并不增加额外的工序,除了最基本的原料成本,不会增加更多的生产成本,可直接采用一个量子点扩散板就起到多种光学效果。
螺杆挤出设备包括三段加热区域,加热区域第一段温度为140-220℃,加热区域第二段温度为160-240℃,加热区域第三段温度为180-260℃。
采用分段加热的方式,能够使防护层和量子点层的原料进行充分加热混合,形成熔融状态,并且模头挤出的温度控制范围为140-220℃,确保防护层和量子点层在挤出过程中,依然处于熔融状态,保持模头的畅通。
螺杆挤出设备设有若干个进料口,可适用多种不同原料放入螺杆挤出设备中,可同时分别多种不同的原料进行加入挤出,从而实现多层板的挤出制作,如上述增加的量子点层,即可通过同步增加一组量子点层的原料,起到同步挤出的目的。
本发明提供一种量子点扩散板及其制备方法,在量子点层的上下表面均覆盖防护层,且防护层同样采用塑料原料、无机扩散剂及其他材料组成,从而使防护层具有光扩散的功能,同时又能给对量子点层起到防护的这样,阻止水氧进入量子点层中,避免量子点层中的量子点失效;而量子点层采用量子点、钛白粉和其他材料进行组成,通过增加钛白粉,使钛白粉中的钛元素提升量子点扩散板的扩散效果,对原先背光中被滤部分光的转换,提高了背光的利用率,并且通过对钛与量子点原料组分的调节,可以实现扩散板内量子点光谱的改变,从而可以对不同的背光灯条进行匹配,大大增强了量子点扩散板的适用灵活度,同时通过提高亮度,也减低背光模组整体的成本。
最后应当说明的是,以上实施例仅用以说明本发明的技术方案,而非对本发明保护范围的限制,尽管参照较佳实施例对本发明作了详细地说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的实质和范围。
Claims (9)
1.一种量子点扩散板,其特征在于,包括量子点层,所述量子点层的上表面和下表面均覆盖有防护层;
所述量子点层各个原料的质量百分比为:塑料原料90-99%、稳定剂0.01-1%、有机硅0.1-3%、无机扩散剂0.1-3%、扩散油0.1-3%、苯乙烯-丁二烯共聚物0.1-2%、硅酸镁盐类矿物0.1-6%、量子点0.01-1%、钛白粉0.2-5%;
所述防护层的各个原料质量百分比为:塑料原料90-99%、稳定剂0.01-1%、有机硅0.1-3%、无机扩散剂0.1-3%、扩散油0.1-3%、苯乙烯-丁二烯共聚物0.1-2%、硅酸镁盐类矿物0.1-6%。
2.如权利要求1所述的量子点扩散板,其特征在于,所述量子点的粒径为2-12nm。
3.如权利要求1所述的量子点扩散板,其特征在于,所述量子点层数量至少为一层。
4.如权利要求1所述的量子点扩散板,其特征在于,所述量子点层和防护层的塑料原料为ps、pc、pmma或ms中的一种或多种组合。
5.如权利要求1所述的量子点扩散板,其特征在于,所述量子点层和防护层的原料均增加有PS耐热剂,所述PS耐热剂的质量百分比为:0.1-3%。
6.一种权利要求1量子点扩散板制备方法,其特征在于,包括以下步骤:
准备两份相同成分的防护层原料以及一份量子点层的原料;
将防护层原料和量子点层原料分别进行混合均匀;
将混合好的防护层原料和量子点层原料分别加入螺杆挤出设备进行加热,形成熔融状态;
最后通过螺杆挤出设备的摸头挤出,将防护层原料和量子点层原料以片状的方式挤出,所述防护层覆盖于量子点层表面。
7.如权利要求7所述的一种量子点扩散板制备方法,其特征在于,所述螺杆挤出设备包括三段加热区域,所述加热区域第一段温度为140-220℃,所述加热区域第二段温度为160-240℃,所述加热区域第三段温度为180-260℃。
8.如权利要求7所述的一种量子点扩散板制备方法,其特征在于,所述模头挤出的温度控制范围为140-220℃。
9.如权利要求7所述的一种量子点扩散板制备方法,其特征在于,所述螺杆挤出设备设有若干个进料口,可适用多种不同原料放入螺杆挤出设备中。
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