TW202213655A - 複合式感測裝置封裝結構及封裝方法 - Google Patents
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Abstract
一種複合式感測裝置封裝結構及封裝方法,該封裝結構包括一基板,其上設置有一發光元件及一感光晶片;一第一不透明物質,設置於該感光晶片上;一透明模塑物質,包覆該發光元件、該感光晶片及該第一不透明物質;及一第二不透明物質,設置於該透明模塑物質中且連接該第一不透明物質。
Description
本發明係指一種封裝結構及封裝方法,尤指一種設有遮擋元件的複合式感測裝置封裝結構及其封裝方法。
近接感測器(proximity sensor,PS)及環境光線感測器(ambient light sensor)廣泛應用於行動電話等攜帶式行動裝置或其它消費性電子裝置內。近接感測器和環境光線感測器都需使用感光元件,而且近接感測器一般還需要使用發光元件(例如紅外線發射器或雷射光發射器)。
為了避免發光元件產生的光線干擾感光元件,傳統方式會在發光元件和感光元件之間設置遮擋元件,以避免串擾(crosstalk)發生。現有的一種封裝方式是使用金屬蓋體或塑料蓋體作為遮擋元件,然而,金屬蓋體與塑料蓋體需使用訂製模具來射出成型,但隨著電路面積以及感測器尺寸的縮減,遮擋元件的結構也會一併微型化。礙於模具成型能力的限制,透過射出成型等方式製作微型化的遮擋元件結構的難度會大幅提升,而且微型化的金屬蓋體與塑料蓋體並不易固定於封裝結構,也容易發生掉落。
如第1圖所示,現有的另一種封裝方式是對密封發光元件92和感光晶片93的透明模塑物質91進行切割,再於所切割出的槽道中填入黑色樹酯而形成遮擋元件94,來防止感光晶片93上的感光元件直接接收到發光元件92發出的發射光。然而切割過程會對結構造成傷害,故預定要被切割出槽道的區域中不能設置任何的導線或電路構造,此種方式會佔掉感光元件晶片93與打線接合(Wire bonding)的空間,不利於微型化的封裝設計。
基於上述缺失,實有必要提供一種近接感測器和環境光線感測器的封裝結構與製程來達到阻斷串擾並使整體微型化的目的,以更符合實際應用的需求。
本發明的主要目的之一即在於提供一種複合式感測裝置封裝結構及封裝方法,尤指一種在感光晶片上設置一第一不透明物質,於透明模塑物質形成連通第一不透明物質的一塑形空間,再將一第二不透明物質填入塑形空間以連接第一不透明物質來共同形成一遮擋元件的複合式感測裝置封裝結構及封裝方法。
本發明揭露一種複合式感測裝置封裝結構,包括一基板,其上設置有一發光元件及一感光晶片;一第一不透明物質,設置於該感光晶片上;一透明模塑物質,包覆該發光元件、該感光晶片及該第一不透明物質;及一第二不透明物質,設置於該透明模塑物質中且連接該第一不透明物質。
本發明另揭露一種複合式感測裝置封裝方法,包含於一基板上設置一發光元件和一感光晶片;在該感光晶片上設置一第一不透明物質;將該發光元件及該感光晶片密封於一透明模塑物質中;於該透明模塑物質形成一塑形空間,該塑形空間連通該第一不透明物質;及將一第二不透明物質填入該塑形空間以連接該第一不透明物質,使該第一不透明物質及該第二不透明物質共同形成一遮擋元件。
第2圖到第7圖為本發明實施例一複合式感測裝置封裝結構的封裝流程示意圖。複合式感測裝置封裝結構包含一基板10、一發光元件11和一感光晶片12。該感光晶片12一般為一特定應用積體電路(Application Specific Integrated Circuit, ASIC),通過積體電路製程製作且可包含感光元件和運算電路(例如近接感測器及/或環境光線感測器的感光元件和運算電路)。
如第2圖所示,發光元件11和感光晶片12設置於基板10上,其中發光元件11和感光晶片12可以透過打線接合製作的導線連接到基板10。惟,除了傳統打線接合製程外,發光元件11或感光晶片12也可以透過其它方式連接到基板10,本發明並不以此為限。於一實施例中,基板10為一銅箔基板、一陶瓷基板、一導線支架、一樹酯基板或一印刷電路板,而打線接合製作的導線則可以為金線,但不限於此。
於本實施例中,複合式感測裝置封裝結構可以整合有一近接感測器(proximity sensor)或一環境光線感測器(ambient light sensor)。發光元件11用來產生發射光(例如紅外光),而感光晶片12用來接收發射光的反射光,讓近接感測器可根據發射光和反射光來進行距離估算。此外,感光晶片12也可用來接收環境光源產生的環境光,以供環境光線感測器進行光度(light intensity)估算。於一實施例中,近接感測器和環境光線感測器的運算電路和感光元件設置在感光晶片12上的同一區域。於其它實施例中,近接感測器和環境光線感測器各自設置在感光晶片12上的不同區域,本發明並不以此為限。
在空間有限的情況下,為了降低感光晶片12和發光元件11之間的串擾(crosstalk),本發明於感光晶片12和發光元件11之間形成不透明的遮擋元件,用來防止感光晶片12直接接收到發光元件11發出的發射光。
首先,本發明實施例之感測裝置封裝結構先在感光晶片12上設置一第一不透明物質。具體而言,如第2圖所示,在本實施例中可將液態不透明膠材20滴在(包含點膠、抹膠等方式)感光晶片12上。液態不透明膠材20在室溫下即呈現液態,因此可在不加溫、不特別施加壓力的情況下,將液態不透明膠材20滴在感光晶片12上,而包覆貼合在感光晶片12表面。
如第3圖所示,對複合式感測裝置封裝結構2進行固化處理,以固化液態不透明膠材20而形成第一不透明物質21。其中,固化處理係將液態不透明膠材20轉化為固體材質的製程,舉例而言,當液態不透明膠材20為環氧樹酯時,該固化處理可以為烘烤,即將複合式感測裝置封裝結構2加熱使其固化。然而,視該不透明膠材20的材料不同,除了加熱固化外,該固化處理也可以為常溫固化(透過讓不透明膠材20接觸氣體或液體使其固化)或是紫外光固化等其它固化處理方式。
如第4圖所示,將發光元件11及感光晶片12密封於一透明模塑物質3中。舉例而言,透過將液態透明膠材(例如樹酯)注入模具,待凝固後形成透明模塑物質3,並移除模具,以將發光元件11、感光晶片12包覆於透明模塑物質3中。
如第5圖所示,於透明模塑物質3形成一塑形空間31,該塑形空間31連通該第一不透明物質21。例如在本實施例中,可使用一切割刀或研磨刀對透明模塑物質3進行切割開槽,以形成一凹槽狀的塑形空間31。切割過程僅需下切至該第一不透明物質21的位置,即可使該塑形空間31連通該第一不透明物質21,亦即使該第一不透明物質21暴露於該塑形空間31中。其中,切割過程可以一併將該第一不透明物質21的局部切除,以增加該第一不透明物質21暴露於該塑形空間31中的表面積,惟本發明並不以此為限。
雖然在第5圖中,該塑形空間31的形狀呈現I形,然而於本實施例中,由於近接感測器及/或環境光線感測器的運算電路和感光元件可以設置在同一區域,因此在電路布局設計時,可將感光元件設置於遠離發光元件11的位置,並將近接感測器和環境光線感測器的運算電路設置於靠近發光元件11的位置。在不影響感光元件的感光能力的情況下,塑形空間31的範圍可延伸到運算電路的上方,使塑形空間31的形狀呈現倒L型。又或者,在本發明其他實施例中,塑形空間31的形狀可以是T形、漏斗形或其它形狀。
將一第二不透明物質22填入塑形空間31以連接第一不透明物質21,使第一不透明物質21及第二不透明物質22共同形成一遮擋元件。具體而言,如第6圖所示,在本實施例中可將液態不透明膠材20滴在(包含點膠、抹膠等方式)塑形空間31中。接著如第7圖所示,再對複合式感測裝置封裝結構2進行固化處理,以固化液態不透明膠材20而形成第二不透明物質22,即可通過相連的第一不透明物質21及第二不透明物質22共同形成遮擋元件。
本實施例選用的不透明膠材20例如是環氧樹酯、矽膠、樹酯跟矽膠混合膠、壓克力膠,且該不透明膠材20可以為黑色環氧樹酯等本身即不透光的材料,或者該不透明膠材20也可以透過摻雜染劑、碳黑、二氧化矽或二氧化鈦等填充物使其形成不透光。如此,該不透明膠材20固化後所形成的第一不透明物質21和第二不透明物質22具有遮光效果。
藉此,本發明實施例之感測裝置封裝結構可於感光晶片12和發光元件11之間形成不透明的遮擋元件,用來防止感光晶片12直接接收到發光元件11發出的發射光。在此結構下,發光元件11發出的發射光可經由透明模塑物質3而傳遞,環境光源和反射光可穿透透明模塑物質3而被感光晶片12的一感光區域A所接收,且該遮擋元件位於該感光區域與該發光元件11之間,故遮擋元件可防止發光元件11發出的發射光直接被感光晶片12所接收,以兼顧光線收發功能和降低串擾。
值得注意的是,相較於現有的封裝方式是直接對透明模塑物質91進行切割,再於所切割出的槽道中填入黑色樹酯而形成遮擋元件94,而佔用感光元件晶片93與打線接合(Wire bonding)的空間,在本發明實施例之複合式感測裝置封裝結構中,是先在先在感光晶片12上設置一第一不透明物質21,並且將發光元件11、感光晶片12連同第一不透明物質21密封於一透明模塑物質3中,才在透明模塑物質3上形成連通該第一不透明物質21的塑形空間31。據此,對透明模塑物質3進行切割開槽以形成塑形空間31的過程僅需下切至該第一不透明物質21的位置,並不會對感光晶片12和發光元件11的結構造成傷害,故在基板10上不需要預留空間供切割製程使用,不會佔用感光晶片12的電路設置空間,也不會佔用感光晶片12和發光元件11打線接合的空間,符合微型化封裝的需求。
更詳言之,請續參照第7圖所示,正因為本發明實施例之複合式感測裝置封裝結構是將液態不透明膠材20滴在感光晶片12上,而包覆貼合在感光晶片12表面來形成第一不透明物質21,這種方式並不會造成結構傷害,且其製程難度較低,僅需確保第一不透明物質21形成在感光晶片12的感光區域A與發光元件11之間,具有較高的實用性與操作彈性。另一方面,在該第一不透明物質21與發光元件11之間的一間隔區域B並不會被切割,故基板10可供發光元件11及感光晶片12的電路或導線設置,使發光元件11及感光晶片12的距離可進一步縮短,而達成微型化的目的。
本發明實施例複合式感測裝置封裝結構的製造方式可歸納為一封裝方法,如第8圖所示,包含但不限於以下步驟。
於一基板上設置一發光元件和一感光晶片。
在感光晶片上設置一第一不透明物質。
將發光元件及感光晶片密封於一透明模塑物質中。
於透明模塑物質形成一塑形空間,該塑形空間連通該第一不透明物質。其中可通過切割透明模塑物質以形成該塑形空間。
將一第二不透明物質填入塑形空間以連接第一不透明物質,使第一不透明物質及第二不透明物質共同形成一遮擋元件。
綜上所述,本發明複合式感測裝置封裝結構及其封裝方法通過在感光晶片上設置一第一不透明物質,於透明模塑物質形成連通第一不透明物質的一塑形空間,再將一第二不透明物質填入塑形空間以連接第一不透明物質來共同形成一遮擋元件,不僅可以降低感光元件和發光晶片之間的串擾,還可降低製程難度,同時縮短發光元件及感光晶片的距離,而滿足微型化封裝的需求。
本發明所屬技術領域中具有通常知識者通過本發明上述揭露的實施方式,可以想到對本發明進行簡單改變,例如參考第5圖所示,相較於切割透明模塑物質3以形成該塑形空間31,也可以將一模具覆蓋於複合式感測裝置封裝結構且抵接第一不透明物質21,再將液態透明膠材(例如樹酯)注入模具,待凝固後形成透明模塑物質3,並移除抵接第一不透明物質21的模具。如此即可讓發光元件11、感光晶片12和第一不透明物質21密封於透明模塑物質3中,且一併形成連通該第一不透明物質21的塑形空間31。此做法的優點是進一步精簡製程步驟,但缺點是製程彈性低(例如, 模具無法重複利用在不同規格的複合式感測裝置封裝結構)。前揭藉由切割刀或研磨刀來切割開槽以形成塑形空間31的做法的是製程彈性更高(例如,切割刀或研磨刀可塑形複雜多樣的形狀)。本領域具通常知識者可根據實際需求來選擇塑形空間的塑形方式。
據此,以上所述僅為本發明之較佳實施例,凡依本發明申請專利範圍所做之均等變化與修飾,皆應屬本發明之涵蓋範圍。
10:基板
11:發光元件
12:感光晶片
20:液態不透明膠材
21:第一不透明物質
22:第二不透明物質
3:透明模塑物質
31:塑形空間
A:感光區域
B:間隔區域
91:透明模塑物質
92:發光元件
93:感光晶片
94:遮擋元件
第1圖為現有感測裝置的封裝結構示意圖;
第2圖到第7圖為本發明實施例一複合式感測裝置封裝結構的封裝流程示意圖;以及
第8圖為本發明實施例一封裝方法的流程圖。
10:基板
11:發光元件
12:感光晶片
21:第一不透明物質
22:第二不透明物質
3:透明模塑物質
A:感光區域
B:間隔區域
Claims (13)
- 一種複合式感測裝置封裝結構,包括: 一基板,其上設置有一發光元件及一感光晶片; 一第一不透明物質,設置於該感光晶片上; 一透明模塑物質,包覆該發光元件、該感光晶片及該第一不透明物質;及 一第二不透明物質,設置於該透明模塑物質中且連接該第一不透明物質。
- 如請求項1所述之複合式感測裝置封裝結構,其中該透明模塑物質具有一塑形空間,該塑形空間連通該第一不透明物質,該第二不透明物質被填入該塑形空間以連接該第一不透明物質。
- 如請求項2所述之複合式感測裝置封裝結構,其中該塑形空間係經由切割該透明模塑物質所形成。
- 如請求項1所述之複合式感測裝置封裝結構,其中該第一不透明物質及該第二不透明物質共同形成一遮擋元件。
- 如請求項4所述之複合式感測裝置封裝結構,其中,該感光晶片具有一感光區域,該遮擋元件位於該感光區域與該發光元件之間。
- 如請求項1所述之複合式感測裝置封裝結構,其中該第一不透明物質係由設置在該感光晶片上的液態不透明膠材經固化形成。
- 如請求項2所述之複合式感測裝置封裝結構,其中該第二不透明物質係由設置在該塑形空間中的液態不透明膠材經固化形成。
- 如請求項1所述之複合式感測裝置封裝結構,其中該第一不透明物質及該第二不透明物質是環氧樹酯、矽膠、樹酯跟矽膠混合膠、壓克力膠。
- 如請求項1所述之複合式感測裝置封裝結構,其中該發光元件用於一近接感測器,且該感光晶片用於該近接感測器或一環境光線感測器。
- 一種複合式感測裝置封裝方法,包含: 於一基板上設置一發光元件和一感光晶片; 在該感光晶片上設置一第一不透明物質; 將該發光元件及該感光晶片密封於一透明模塑物質中; 於該透明模塑物質形成一塑形空間,該塑形空間連通該第一不透明物質;及 將一第二不透明物質填入該塑形空間以連接該第一不透明物質,使該第一不透明物質及該第二不透明物質共同形成一遮擋元件。
- 如請求項10所述之複合式感測裝置封裝方法,其中係通過切割該透明模塑物質以形成該塑形空間。
- 如請求項10所述之複合式感測裝置封裝方法,其中該感光晶片具有一感光區域,該第一不透明物質位於該感光區域與該發光元件之間。
- 如請求項10所述之複合式感測裝置封裝方法,其中將該發光元件及該感光晶片密封於該透明模塑物質中的步驟另包含將一模具抵接該第一不透明物質,再將液態透明膠材注入該模具,待凝固後形成該透明模塑物質,並移除抵接該第一不透明物質的模具,以一併形成連通該第一不透明物質的該塑形空間。
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