CN109233670A - 一种可用于屏下指纹识别的ab胶 - Google Patents
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Abstract
一种可用于屏下指纹识别的AB胶,包括光学膜基材,光学膜基材为流延成型的PC、PMMA或TPU薄膜,抑或是涂布成型的PMMA薄膜或者单向拉伸的PET薄膜,在光学膜基材的上表面涂覆100%固含量的OCA胶层,在光学膜基材的下表面涂覆一层用于阻隔其吸湿透气性的封闭底涂层,OCA胶层上复合离型膜,在封闭底涂层的下表面涂覆排气胶层,在排气胶层的下表面复合一层PET底膜。本发明采用流延成型的PC、PMMA、TPU、涂布成型的PMMA或者单向拉伸的PET薄膜作为基材,使AB胶在厚度方向的相位差大幅降低,并在基材下表面涂布封闭底涂层,可避免因环境湿度变化导致基材相位差发生改变的情况,更好地保证AB胶的性能稳定性,由此保障AB胶始终能够保持极高的屏下指纹识别准确率和灵敏度。
Description
技术领域
本发明涉及胶粘材料技术领域,具体来说涉及一种可用于屏下指纹识别的AB胶。
背景技术
随着科技的发展,屏下指纹成为智能手机解锁的一种发展趋势,当前采用屏下光学指纹识别的智能手机越来越多。
目前智能手机显示屏的保护膜主要采用钢化玻璃膜,钢化玻璃膜具有硬度高、韧性低、抗冲击等能力,能够提高智能手机屏幕的使用寿命。钢化玻璃膜是由钢化玻璃和AB胶组成,传统的AB胶是由硅胶胶层、双拉PET薄膜基材层及OCA胶层组成,AB胶的OCA胶层贴合于钢化玻璃上,薄膜基材层位于硅胶胶层和OCA胶层之间,硅胶胶层用于贴合手机外屏。
现有应用于屏下指纹手机的保护膜大多采用PC或者PC+PMMA复合的塑料保护膜,该保护膜材料的生产工艺复杂,且使用手感和硬度差于钢化玻璃膜。以往应用在智能手机上的钢化玻璃膜由于其采用的AB胶利用双向拉伸的PET作基材,屏下指纹解锁的准确性和灵敏度差,无法满足日常使用。要想实现钢化玻璃膜在屏下指纹手机上的应用,AB胶的改进尤为关键。
发明内容
本发明提供一种低相位AB胶,通过该AB胶能够实现快速屏下指纹识别,并能够有效保护手机等电子设备的屏幕,延长其使用寿命。
为实现上述目的,本发明采用以下技术方案:
一种可用于屏下指纹识别的AB胶,包括光学膜基材,所述光学膜基材为流延成型的PC、PMMA或TPU薄膜,抑或是涂布成型的PMMA薄膜或者单向拉伸的PET薄膜,在所述光学膜基材的上表面涂覆100%固含量的OCA胶层,在所述光学膜基材的下表面涂覆一层用于阻隔其吸湿透气性的封闭底涂层,所述OCA胶层上复合离型膜,在所述封闭底涂层的下表面涂覆排气胶层,在所述排气胶层的下表面复合一层PET底膜。
优选的,所述OCA胶层为丙烯酸光学胶水层。
优选的,所述排气胶层为具有排气性的硅胶层或者PU胶层或者亚克力胶层。
优选的,该 AB胶的总厚度为0.1~0.45mm。
优选的,所述光学膜基材的透光率≥90%,折射率≥1.45。
优选的,在所述光学膜基材的表面涂布一层防蓝光硬化层或者在该光学膜基材内部添加有可吸收400-470nm蓝光的蓝光吸收剂。
本发明采用流延成型的PC、PMMA、TPU、涂布成型的PMMA或者单向拉伸的PET薄膜作为基材,经测试,最终得到的AB胶产品与现有AB胶相比,其在厚度方向的相位差大幅降低(基材厚度0.2mm时,相位差可以做到20nm以下),由于本发明还在基材下表面涂布了一层能阻隔光学薄膜基材吸湿透气性的封闭底涂层(基材上表面100%固含量的OCA胶同样也能够阻隔基材的吸湿透气性),可以避免因环境湿度变化导致基材相位差发生改变的情况(基材吸湿后会导致其内部微观结构发生改变,从而导致相位差以及折射率发生改变),更好地保证了AB胶在长期储存和使用过程中的性能稳定性,由此保障本发明提供的AB胶始终能够保持极高的屏下指纹识别准确率和灵敏度,采用上述AB胶的钢化玻璃保护膜能够应用于屏下指纹手机,手机贴覆该钢化玻璃保护膜后不会像现有技术一样导致屏下指纹识别的准确性和灵敏度明显降低。
附图说明
图1为本发明中AB胶的结构示意图;
图中:
1——光学膜基材 2——封闭底涂层 3——OCA胶层
4——离型膜 5——排气胶层 6——PET底膜。
具体实施方式
为了便于本领域技术人员的理解,下面结合实施例与附图对本发明作进一步的说明,实施方式提及的内容并非对本发明的限定。
在本发明的描述中,需要理解的是,术语“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为附图所示的方位或位置关系,仅是为了便于描述本发明和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。
在本发明的描述中,需要说明的是,除非另有规定和限定,术语“安装”、“相连”、“连接”应做广义理解,例如,可以是机械连接或电连接,也可以是两个元件内部的连通,可以是直接相连,也可以通过中间媒介间接相连,对于本领域的普通技术人员而言,可以根据具体情况理解所述术语的具体含义。
见图1所示,一种可用于屏下指纹识别的AB胶,包括光学膜基材1,光学膜基材1为流延成型的PC、PMMA或TPU薄膜,抑或是涂布成型的PMMA薄膜或者单向拉伸的PET薄膜,在光学膜基材1的上表面涂覆100%固含量的OCA胶层3,在光学膜基材1的下表面涂覆一层用于阻隔其吸湿透气性的封闭底涂层2,OCA胶层3上复合离型膜4,在封闭底涂层2的下表面涂覆排气胶层5,在排气胶层5的下表面复合一层PET底膜6。
本发明采用流延成型的PC、PMMA、TPU、涂布成型的PMMA或者单向拉伸的PET薄膜作为基材,经测试,最终得到的AB胶产品与现有AB胶相比,其在厚度方向的相位差大幅降低(基材厚度0.2mm时,相位差可以做到20nm以下),由于本发明还在基材下表面涂布了一层能阻隔光学薄膜基材吸湿透气性的封闭底涂层(基材上表面100%固含量的OCA胶同样也能够阻隔基材的吸湿透气性),可以避免因环境湿度变化导致基材相位差发生改变的情况(基材吸湿后会导致其内部微观结构发生改变,从而导致相位差以及折射率发生改变),更好地保证了AB胶在长期储存和使用过程中的性能稳定性,由此保障本发明提供的AB胶始终能够保持极高的屏下指纹识别准确率和灵敏度,采用上述AB胶的钢化玻璃保护膜能够应用于屏下指纹手机,手机贴覆该钢化玻璃保护膜后不会像现有技术一样导致屏下指纹识别的准确性和灵敏度明显降低。
优选的,OCA胶层3为丙烯酸光学胶水层。
优选的,排气胶层5为具有排气性的硅胶层或者PU胶层或者亚克力胶层。其具有快速排除气泡的效果。
优选的,该 AB胶的总厚度为0.1~0.45mm。
优选的,光学膜基材1的透光率≥90%,折射率≥1.45。
优选的,在光学膜基材1的表面涂布一层防蓝光硬化层或者在该光学膜基材1内部添加有可吸收400-470nm蓝光的蓝光吸收剂。
上述实施例为本发明较佳的实现方案,除此之外,本发明还可以其它方式实现,在不脱离本技术方案构思的前提下任何显而易见的替换均在本发明的保护范围之内。
为了让本领域普通技术人员更方便地理解本发明相对于现有技术的改进之处,本发明的一些附图和描述已经被简化,并且为了清楚起见,本申请文件还省略了一些其它元素,本领域普通技术人员应该意识到这些省略的元素也可构成本发明的内容。
Claims (6)
1.一种可用于屏下指纹识别的AB胶,包括光学膜基材(1),其特征在于:所述光学膜基材(1)为流延成型的PC、PMMA或TPU薄膜,抑或是涂布成型的PMMA薄膜或者单向拉伸的PET薄膜,在所述光学膜基材(1)的上表面涂覆100%固含量的OCA胶层(3),在所述光学膜基材(1)的下表面涂覆一层用于阻隔其吸湿透气性的封闭底涂层(2),所述OCA胶层(3)上复合离型膜(4),在所述封闭底涂层(2)的下表面涂覆排气胶层(5),在所述排气胶层(5)的下表面复合一层PET底膜(6)。
2.根据权利要求1所述的可用于屏下指纹识别的AB胶,其特征在于:所述OCA胶层(3)为丙烯酸光学胶水层。
3.根据权利要求1所述的可用于屏下指纹识别的AB胶,其特征在于:所述排气胶层(5)为具有排气性的硅胶层或者PU胶层或者亚克力胶层。
4.根据权利要求1所述的可用于屏下指纹识别的AB胶,其特征在于:该 AB胶的总厚度为0.1~0.45mm。
5.根据权利要求1所述的可用于屏下指纹识别的AB胶,其特征在于:所述光学膜基材(1)的透光率≥90%,折射率≥1.45。
6.根据权利要求1所述的可用于屏下指纹识别的AB胶,其特征在于:在所述光学膜基材(1)的表面涂布一层防蓝光硬化层或者在该光学膜基材(1)内部添加有可吸收400-470nm蓝光的蓝光吸收剂。
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