CN107267081A - 用于具有触摸屏幕的移动电子装置的屏幕保护件 - Google Patents

用于具有触摸屏幕的移动电子装置的屏幕保护件 Download PDF

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CN107267081A
CN107267081A CN201710217367.2A CN201710217367A CN107267081A CN 107267081 A CN107267081 A CN 107267081A CN 201710217367 A CN201710217367 A CN 201710217367A CN 107267081 A CN107267081 A CN 107267081A
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J·罗伯茨
W·马沙尔
B·索普
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Tech 21 Ltd
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Abstract

一种用于具有触摸屏幕的移动电子装置的屏幕保护件(5)。该屏幕保护件包括平坦层压膜，该平坦层压膜包括粘结到热塑性聚氨酯(TPU)层(3)的一面的聚对苯二甲酸乙二醇酯(PET)层(2)以及在所述TPU层的相反侧的粘合剂层(4)。所述PET层小于50μm厚，并且其中，所述粘合剂层提供大于5g/cm2的粘力。相对薄的PET层与相对高粘力粘合剂提供了一种特别适合于具有弯曲屏幕的装置的屏幕保护件。

Description

用于具有触摸屏幕的移动电子装置的屏幕保护件
技术领域
本发明涉及一种用于具有触摸屏幕的移动电子装置的屏幕保护件。
背景技术
这样的装置的最新发展是三星Galaxy S6Edge+(RTM)，一种具有玻璃正面的装置，该玻璃正面沿其两个前侧边缘弯曲。屏幕在整个装置上延伸，使得屏幕的两侧边缘遵循玻璃的曲率并且屏幕本身弯曲。对于给定装置尺寸，这使屏幕尺寸最大化。在装置的边缘处存在触摸屏幕还提供了新颖和多样的方式来与装置交互。
尽管这种曲边屏幕为用户提供了上述益处，这给屏幕保护件的制造商带来了技术挑战。屏幕保护件通常作为从较大片材切割的平坦层压膜来制造。然而，这些片材是平坦的，因此不太适合上述装置的弯曲边缘。另外，用户旨在通过在这种装置的边缘上滑动他们的拇指或手指以操作嵌入触摸屏幕的边缘中的功能特征来与装置交互。这样的动作往往会使端接于屏幕的边缘处的任何膜在该点从屏幕剥离。因此，不仅在装置的几何形状难处理的区域中屏幕保护件必须附着到装置，而且它必须还能够抵抗这种剥离。
Spigen已在其“Curved Crystal”屏幕保护件中进行了解决这些挑战的一种尝试。这是一种形成有预弯曲的边缘以适形于装置的形状的屏幕保护件。一旦从片材上切下膜，这种屏幕保护件就需要热处理步骤，从而增加了制造工艺的费用。另外，诸如热塑性聚氨酯(TPU)的材料如果经受这样的热处理的话将变色，因此该制造工艺限制了可使用的材料。
同样来自Spigen的对该问题的第二方法是“Flex HD”屏幕。这是TPU片材和粘合剂。使用TPU意味着膜是高度柔性的，因此能够在围绕屏幕的弯曲边缘的施加工艺期间被用户弯曲。然而，这种高柔性的代价是TPU层较软，因此易于划伤。另外，尽管TPU有利于吸收冲击，但是它不利于消散这样的冲击并且具有较差的抗划性。
发明内容
根据本发明，提供了一种用于具有触摸屏幕的移动电子装置的屏幕保护件，该屏幕保护件包括平坦层压膜，该平坦层压膜包括粘结到热塑性聚氨酯(TPU)层的一面的聚对苯二甲酸乙二醇酯(PET)层以及在所述TPU层的相反侧的粘合剂层；其中，所述PET层小于50μm厚，并且其中，所述粘合剂层提供大于5g/cm2的粘力。
本发明能够提供一种用于移动电子装置的屏幕保护件，其适用于具有带弯曲边缘的屏幕的装置。该保护件可容易地施加，抗划，并且提供现有技术中没有的高保护程度。这是因为包含比TPU硬的PET层。该PET层更抗划，并且有效地与TPU组合工作。较硬的PET层在TPU的更宽区域上消散冲击，然后TPU吸收消散的冲击。该PET层比传统平坦屏幕保护件已知的PET层薄。这确保了更柔性的膜，并且减小了膜自己从弯曲边缘脱离并返回到其平坦状态的趋势。即使当用户在边缘上滑动他们的拇指或手指时，具有比传统屏幕保护件中所使用的粘合剂大五倍以上的高粘力的粘合剂的使用也确保了边缘处的牢固粘结。PET层还允许提供诸如防眩光、隐私保护、着色、耐指纹、自愈、耐划涂层的涂层处理。
由于保护件作为平坦片材来制造，所以不需要热成形步骤，因此屏幕保护件可包括TPU层。与上述Curved Crystal保护件相比，这使得它能够更低廉地和快速地制造并且提供更大的冲击保护。
为免存疑，要求保护件为平坦层压膜意指提供给用户的屏幕保护件在直接从片材切割并且未经受任何形式的热和/或加压处理以使膜永久地弯曲的意义上讲是平坦的。只有在使用中，屏幕保护件的边缘才在安装过程中随着它们粘附到屏幕的弯曲边缘而不再平坦。Curved Crystal保护件不是平坦层压膜，因为它在边缘处弯曲，但是Flex HD保护件是平坦层压膜。
PET层可优选小于40μm厚。它还优选小于TPU层的厚度的一半，更优选小于TPU层的厚度的三分之一，优选小于TPU层的厚度的四分之一。
PET层可小于粘合剂层的厚度的两倍，优选小于粘合剂层的厚度的1.5倍，最优选小于粘合剂层的厚度。
在PET层较薄的情况下，TPU通常形成膜厚度的更大部分，使得TPU的厚度优选大于总膜厚度的三分之二。
膜的总厚度可减小为优选小于250μm，并且优选小于220μm。PET层可涂覆有本领域已知的防眩光、耐划或自愈涂层以便增强屏幕保护件的性能。如上所述，应该在确定膜的总厚度时考虑任何这样的涂层。
粘力优选大于6g/cm2，更优选大于7g/cm2。
所述屏幕保护件可包括在TPU层和粘合剂之间的另一PET层。
所述屏幕保护件优选在可移除地附接至平坦层压膜的任一侧的一对释放层之间提供给用户。在将保护件施加到装置之前第一释放层能够被移除以暴露粘合剂层，而一旦保护件被施加到装置以在运输和安装期间保护该装置，第二释放层就能够被移除。由于膜是平坦的，所以两个释放层可都为平坦的，同样使得制造成本最小化。
本发明还扩展至一种施加根据本发明的第一方面的屏幕保护件的方法，该方法包括以下步骤：将层压膜放到装置的屏幕上以使粘合剂层与屏幕接触；以及使膜的边缘在屏幕的边缘上弯曲并且将膜的边缘粘附在适当位置(in place)。
本发明还扩展至一种具有沿其纵向边缘弯曲的触摸屏幕的移动电子装置与粘附到包括弯曲的区域的触摸屏幕的根据本发明的第一方面的屏幕保护件组合的组合件。
附图说明
现在将参照附图描述根据本发明的屏幕保护件的示例，附图中：
图1是现有技术的屏幕保护件的示意图；
图2是本发明的屏幕保护件的相似示图；
图3A和图3B是示出将屏幕保护件施加到移动电子装置上的工艺的示意性端视图；以及
图4是示出在两个释放层之间的保护件的示意性横截面。
具体实施方式
图1示出申请人目前作为抗冲击(Impact Shield)屏幕保护件销售的屏幕保护件。该屏幕保护件是三个主要层的层压件，即，100μm厚的PET上层、150μm厚的中央TPU层(称作BulletShield(RTM))以及30μm厚的硅粘合剂底层。该粘合剂具有1.5g/cm2(10g/inch2)的粘力。PET和TPU层利用粘合剂来粘结。对PET的顶部施加可选的防眩光、抗划和自愈涂层。屏幕保护件的总厚度为280μm。
图2示出根据本发明的屏幕保护件的对应示图。该屏幕保护件使用相同的TPU层，但是PET层减小至其原始厚度的25％，使得它如今为25μm厚。使用相同厚度的粘合剂，但是已经用具有9.3g/cm2(60g/inch2)的粘力的强得多的粘合剂代替。屏幕保护件利用与以前相同的技术来制造，只是使用了厚度减小的PET和不同的粘合剂。这意味着可通过从层压材料片材切割来快速地和低廉地制造屏幕保护件。因此不需要片材的后续成形。
如前所述，屏幕保护件在PET和TPU层以及许多先前所述的涂层之间可具有粘合剂。
如图4所示，屏幕保护件5被夹在两个释放层9和10之间来提供给用户，两个释放层9和10均具有传统构造。下面的层9粘附到粘合剂层8，用户在将保护件施加到移动电子装置D之前首先移除该层9，如图3A所示。上面的释放层设置有一对突出件11，释放层的两侧各一个，其使得用户能够操纵屏幕保护件以便于准确地置于装置的屏幕上。
在施加之前，可用水和清洁剂或者用酒精来清洁屏幕，以去除屏幕的污渍和油脂。
屏幕保护件5最初被平放于装置D的屏幕上，此时可进行刮擦以便去除任何气泡。另选地，这可稍后进行。然后在图3B所示的位置将屏幕保护件的两侧边缘按压到屏幕S的弯曲边缘E上。同样，在这一阶段可推挤出气泡。从图1和图2的比较，边缘附近的PET层生成“剥离”的程度极大地减小。这是因为PET相对刚性。与较薄的层相比，较厚的层在弯曲离开中性面时将生成更高的恢复力。
从图3B将理解，本发明提供了在最需要的区域中在屏幕保护件5和屏幕S之间提供强粘结的强粘合剂层。从图3B将理解，拇指或手指围绕装置的边缘的动作往往会导致屏幕保护件的边缘剥离，本发明的屏幕保护件可强有力地抵抗这种剥离。

Claims (12)

1.一种用于具有触摸屏幕的移动电子装置的屏幕保护件，该屏幕保护件包括平坦层压膜，该平坦层压膜包括粘结到热塑性聚氨酯TPU层的一面的聚对苯二甲酸乙二醇酯PET层以及在所述TPU层的相反侧的粘合剂层；其中，所述PET层小于50μm厚，并且其中，所述粘合剂层提供大于5g/cm2的粘力。
2.根据权利要求1所述的屏幕保护件，其中，所述PET层小于40μm厚。
3.根据权利要求1或权利要求2所述的屏幕保护件，其中，所述PET层小于所述TPU层的厚度的一半。
4.根据权利要求2所述的屏幕保护件，其中，所述PET层小于所述TPU层的厚度的三分之一。
5.根据任何前述权利要求所述的屏幕保护件，其中，所述PET层小于所述粘合剂层的厚度的两倍，优选小于所述粘合剂层的厚度的1.5倍，最优选小于所述粘合剂层的厚度。
6.根据前述权利要求中的任一项所述的屏幕保护件，其中，所述TPU的厚度大于总膜厚度的三分之二。
7.根据前述权利要求中的任一项所述的屏幕保护件，其中，膜厚度小于250μm，优选小于220μm。
8.根据前述权利要求中的任一项所述的屏幕保护件，其中，所述粘力大于6g/cm2，更优选大于7g/cm2。
9.根据前述权利要求中的任一项所述的屏幕保护件，该屏幕保护件还包括位于所述TPU层和所述粘合剂之间的第二PET层。
10.一种根据前述权利要求中的任一项所述的屏幕保护件、第一释放层以及第二释放层的组合件，在将所述保护件施加到装置之前所述第一释放层能够被移除以暴露所述粘合剂层，一旦所述保护件被施加到所述装置以在运输和安装期间保护所述装置，所述第二释放层就能够被移除以暴露所述屏幕保护件的上表面。
11.一种施加根据权利要求1至9中的任一项所述的屏幕保护件的方法，该方法包括以下步骤：将所述层压膜放到所述装置的所述屏幕上以使所述粘合剂层与所述屏幕接触；以及使所述膜的边缘在所述屏幕的边缘上弯曲并且将所述膜的边缘粘附在适当位置。
12.一种具有触摸屏幕的移动电子装置与根据权利要求1至9中的任一项所述的屏幕保护件的组合件，其中，所述触摸屏幕沿所述触摸屏幕的纵向边缘是弯曲的，所述屏幕保护件粘附到包括弯曲的边缘的所述触摸屏幕。
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CN112567310A (zh) * 2018-08-31 2021-03-26 华为技术有限公司 柔性保护膜、曲面显示屏及终端
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