CN106098644A - 一种daf膜与垫块结合的芯片封装结构及其制造方法 - Google Patents
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Abstract
本发明公开了一种DAF膜与垫块结合的芯片封装结构及其制造方法,该封装结构包括:基板、指纹传感芯片、保护盖板、垫块,指纹传感芯片与基板之间通过键合丝进行互连,基板上表面、指纹传感芯片、键合丝、垫块及保护盖板下表面被DAF膜包裹。本发明的指纹传感芯片封装结构采用DAF膜进行保护盖板的直接贴装,无需塑封工序,优化工艺流程;且DAF膜和垫块结合用于指纹传感芯片的封装结构,使得保护盖板和指纹传感芯片表面之间的间距更好控制,保证指纹识别芯片的识别效果,提高封装良率。
Description
技术领域
本发明涉及传感器芯片封装技术领域,具体是一种DAF膜结合垫块的指纹传感芯片封装结构及其制造方法。
背景技术
随着现代社会的进步,个人身份识别以及个人信息安全的重要性逐步受到人们的关注。由于人体指纹具有唯一性和不变性,使得指纹识别技术具有安全性好,可靠性高,使用简单方便的特点,使得指纹识别技术被广泛应用于保护个人信息安全的各种领域,例如,手机、电脑、门禁、考勤及其他涉密系统等领域均出现了各式各样的指纹识别系统。
当前指纹传感芯片封装技术主要以重叠注塑和塑封工艺居多,对于塑封封装技术产品完成封装后,模组组装过程需要在指纹传感芯片表面加玻璃、蓝宝石等盖板,以保护指纹传感芯片在使用过程中不被磨损,破坏。例如,公开号为CN104051366A的专利文献,公开了一种指纹识别芯片封装结构,包括基板、耦合于基板表面的感应芯片、位于感应芯片的感应区表面的上盖层,以及位于基板和感应芯片表面的塑封层,所述塑封层暴露出所述上盖层。通过塑封料对指纹传感芯片表面进行封装,则采集指纹时感应信号需穿过塑封料、盖板或者图层,使得信号干扰大,且封装厚度及芯片表面与塑封体间距离难以控制。
发明内容
本发明的目的是针对现有的不足,提供一种DAF膜与垫块结合的芯片封装结构及其制造方法。所述芯片封装结构采用DAF膜进行保护盖板的直接贴装,无需塑封工序,优化工艺流程;且DAF膜和垫块结合用于指纹传感芯片的封装结构,使得保护盖板和指纹传感芯片表面之间的间距更好控制,保证指纹识别芯片的识别效果,提高封装良率。
为实现上述目的,本发明提供如下技术方案:
一种DAF膜与垫块结合的芯片封装结构,包括:基板、指纹传感芯片、保护盖板,所述指纹传感芯片位于所述基板的上方,所述指纹传感芯片的焊盘面向上,所述指纹传感芯片与所述基板之间通过键合丝进行互连,所述保护盖板位于所述指纹传感芯片的感应区域正上方,所述封装结构还包括垫块,所述垫块位于所述基板和所述保护盖板之间,所述基板上表面、指纹传感芯片、键合丝、垫块及保护盖板下表面被DAF膜包裹。
进一步,所述指纹传感芯片与所述基板之间通过粘结胶粘接在一起。
进一步,所述粘结胶为环氧树脂胶。
进一步,所述指纹传感芯片为电容式指纹传感芯片或电阻式指纹传感芯片。
进一步,所述保护盖板材质的介电常数大于3、硬度大于4H、粗糙度小于2μm。
进一步,所述保护盖板材质为玻璃、蓝宝石或者陶瓷材料。
进一步,所述垫块至少两个,均匀且对称分布在芯片周围。
一种DAF膜与垫块结合的芯片封装结构的制造方法,包括以下步骤:
步骤一:准备基板;
步骤二:将指纹传感芯片贴装在基板上;
步骤三:将垫块贴装在基板上;
步骤四:通过引线键合工艺,将指纹传感芯片与基板电路形成互连通路;
步骤五:用DAF膜将保护盖板直接贴装在指纹传感芯片的上方,使得DAF膜结合垫块基板上表面、指纹传感芯片和键合丝。
进一步,所述步骤一至步骤三用以下步骤代替:
步骤一:准备带有垫块的基板;
步骤二:将指纹传感芯片贴装在基板上;
与现有技术相比,本发明的有益效果是:
本发明所述的指纹传感芯片封装结构采用DAF膜进行保护盖板的直接贴装,无需塑封工序,优化工艺流程,节约成本;且DAF膜和垫块结合用于指纹传感芯片的封装结构,使得保护盖板和指纹传感芯片表面之间的间距更好控制,避免在贴装过程中因DAF膜晃动而导致保护盖板倾斜的风险,保证指纹识别芯片的识别效果,提高封装良率。
附图说明
图1为本发明所述芯片封装结构的示意图;
图2为本发明所述DAF膜的示意图;
图3为本发明所述基板示意图;
图4为本发明所述指纹传感芯片贴装在基板上的示意图;
图5为本发明所述垫块贴装在基板示意图;
图6为本发明所述键合示意图;
图7为本发明所述带垫块的基板示意图。
图中:1、基板;2、粘结胶;3、指纹传感芯片;4、垫块;5、键合丝;6、DAF膜;7、保护盖板;8、保护膜;9、功能胶膜;10、基层胶膜。
具体实施方式
下面结合附图对本发明作进一步说明。
如图1所示,一种DAF膜与垫块结合的芯片封装结构,包括:基板1、指纹传感芯片3、垫块4、保护盖板7,所述指纹传感芯片3位于基板1的上方,所述指纹传感芯片3的焊盘面向上,所述指纹传感芯片3与基板1之间通过键合丝5进行互连,所述保护盖板7位于指纹传感芯片3的感应区域正上方,所述垫块4位于所述基板1和保护盖板7之间,所述基板1上表面、指纹传感芯片3、键合丝5、垫块4及保护盖板7下表面被DAF膜6包裹。所述键合丝5优选为2根,所述垫块4优选为2个,对称的分布在指纹传感芯片3的两侧。
所述DAF膜6形态为半固态胶膜,有粘性但不会流动。该DAF膜6在半固态的状态下具有高弹性,可以将指纹传感芯片3和键合丝5包裹;通过烘烤达到Tg点后,DAF膜6变成不可逆的固态,从而保护指纹传感芯片3。如图2所示,所述DAF膜6在加工之前有三层结构,分别为:保护膜8,对功能胶膜9进行保护,便于包装、运输,加工过程中需分离;功能胶膜9,包裹指纹传感芯片3并实现保护盖板7与基板1之间的粘接;基层胶膜10,承载功能胶膜9与保护盖板7,便于封装。
所述指纹传感芯片3与所述基板1之间通过粘结胶2粘接在一起,所述粘结胶2优选为环氧树脂胶,所述指纹传感芯片3优选为电容式指纹传感芯片或电阻式指纹传感芯片。
所述保护盖板7材质的介电常数大于3、硬度大于4H、粗糙度小于2μm,优选为玻璃、蓝宝石或者陶瓷材料。
一种DAF膜与垫块结合的芯片封装结构的制造方法,包括以下步骤:
步骤一:准备基板1,如图3所示;
步骤二:将指纹传感芯片3贴装在基板1上,如图4所示;
步骤三:将垫块4贴装在基板1上,如图5所示;
步骤四:通过引线键合工艺,将指纹传感芯片3与基板1电路形成互连通路,如图6所示;
步骤五:用DAF膜6将保护盖板7直接贴装在指纹传感芯片3的上方,用DAF膜6包裹基板1上表面、指纹传感芯片3、垫块4和键合丝5,得到如图1所示的封装结构。
所述DAF膜结合垫块的指纹传感芯片封装结构还可以采用以下方法制造:
步骤一:准备带有垫块4的基板1,如图7所示;
步骤二:将指纹传感芯片3贴装在基板1上,如图5所示;
步骤三:通过引线键合工艺,将指纹传感芯片3与基板1电路形成互连通路,如图6所示;
步骤四:用DAF膜6将保护盖板7直接贴装在指纹传感芯片3的上方,用DAF膜6包裹基板1上表面、指纹传感芯片3、垫块4和键合丝5,得到如图1所示的封装结构。
本发明所述的指纹传感芯片封装结构采用DAF膜进行保护盖板的直接贴装,无需塑封工序,优化工艺流程,节约成本;且DAF膜和垫块结合用于指纹传感芯片的封装结构,使得保护盖板和指纹传感芯片表面之间的间距更好控制,避免在贴装过程中因DAF膜晃动而导致保护盖板倾斜的风险,保证指纹识别芯片的识别效果,提高封装良率。
本发明通过具体实施过程进行说明的,在不脱离本发明范围的情况下,还可以对本发明专利进行各种变换及等同代替,因此,本专利不局限于所公开的具体实施过程,而应当包括落入本发明专利权利要求范围内的全部实施方案。
Claims (9)
1.一种DAF膜与垫块结合的芯片封装结构,包括:基板、指纹传感芯片、保护盖板,所述指纹传感芯片位于基板的上方,所述指纹传感芯片的焊盘面向上,所述保护盖板位于指纹传感芯片的感应区域正上方,其特征在于:所述封装结构还包括垫块,垫块位于所述基板和所述保护盖板之间,所述基板上表面、指纹传感芯片、键合丝、垫块及保护盖板下表面被DAF膜包裹。
2.根据权利要求1所述的DAF膜与垫块结合的芯片封装结构,其特征在于:所述指纹传感芯片与基板之间通过粘结胶粘接在一起。
3.根据权利要求2所述的DAF膜与垫块结合的芯片封装结构,其特征在于:所述粘结胶为环氧树脂胶。
4.根据权利要求1所述的DAF膜与垫块结合的芯片封装结构,其特征在于:所述指纹传感芯片为电容式指纹传感芯片或电阻式指纹传感芯片。
5.根据权利要求1所述的DAF膜与垫块结合的芯片封装结构,其特征在于:所述保护盖板材质的介电常数大于3、硬度大于4H、粗糙度小于2μm。
6.根据权利要求5所述的DAF膜与垫块结合的芯片封装结构,其特征在于:所述保护盖板材质为玻璃、蓝宝石或者陶瓷材料。
7.根据权利要求1所述的DAF膜与垫块结合的芯片封装结构,其特征在于:所述垫块至少两个,均匀且对称分布在芯片周围。
8.一种DAF膜与垫块结合的芯片封装结构的制造方法,其特征在于:所述制造方法包括以下步骤:
步骤一:准备基板;
步骤二:将指纹传感芯片贴装在基板上;
步骤三:将垫块贴装在基板上;
步骤四:通过引线键合工艺,将指纹传感芯片与基板电路形成互连通路;
步骤五:用DAF膜将保护盖板直接贴装在指纹传感芯片的上方,使得DAF膜结合垫块、基板上表面、指纹传感芯片、垫块和键合丝。
9.根据权利要求8所述DAF膜与垫块结合的芯片封装结构的制造方法,其特征在于:所述步骤一至步骤三用以下步骤代替:
步骤一:准备带有垫块的基板;
步骤二:将指纹传感芯片贴装在基板上。
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