TWI473304B - A plurality of blue light emitting diode chips in white - Google Patents

A plurality of blue light emitting diode chips in white Download PDF

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TWI473304B
TWI473304B TW102130864A TW102130864A TWI473304B TW I473304 B TWI473304 B TW I473304B TW 102130864 A TW102130864 A TW 102130864A TW 102130864 A TW102130864 A TW 102130864A TW I473304 B TWI473304 B TW I473304B
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light
emitting diode
fluorescent powder
light emitting
blue light
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TW102130864A
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TW201508952A (zh
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Tsungkan Cheng
Chiachin Chen
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Harvatek Corp
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Priority to TW102130864A priority Critical patent/TWI473304B/zh
Priority to CN201410174233.3A priority patent/CN104425688A/zh
Priority to US14/301,323 priority patent/US20150060902A1/en
Priority to JP2014121589A priority patent/JP2015046574A/ja
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Publication of TW201508952A publication Critical patent/TW201508952A/zh

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Description

複數個藍光發光二極體晶片的白光封裝
本發明係關於一種發光二極體晶片的封裝,尤其是關於一種可正面及背面兩面出光之複數個藍光發光二極體晶片的白光封裝。
發光二極體晶片的白光封裝的一般構造,係於藍光發光二極體晶片上覆蓋黃光螢光粉膠,而成白光出光者,其可拿來裝配於電路板上等,應用於各種產品,例如燈具、電視機的背光模組等。
具光反射牆的發光二極體晶片的白光封裝,一般係於封裝的殼體之牆部內面做成光反射面,而能將前述藍光發光二極體晶片其射向側面的藍光反射回去,激發更多前述的黃光螢光粉膠其中靠近外緣部分的螢光粉的表面積,並且該光反射面亦將所激發螢光粉的黃光反射出去,以增加出光效率。
發光二極體晶片的封裝有單個晶片的封裝,或複數個晶片以電路串連或並連的封裝,複數個藍光發光二極體晶片的白光封裝與單個晶片的白光封裝的產品特徵之不相同點為,利用前者來做成燈具其後續構造及製程較簡單,不須用大量的單個晶片的封裝一個一個的一再焊接於電路板上。
第1圖是繪示習知一種具光反射牆的單個發光二極體晶片的白光封裝100,其包括有殼體110,殼體110上部做成光反射牆111,其內面做成光反射面112,光反射面通常為白色,此外,該白光封裝100還有藍光發光二極體晶片113,以及黃光螢光粉膠114等。其中,光反射面112能將該藍光發光二極體晶片113其射向側面的藍光反射回去,激發更多前述黃光螢光粉膠114其中靠近外緣部分的螢光粉(未圖示)的表面積,並且該光反射面亦將所激發螢光粉的黃光反射出去,以增加出光效率。
第2圖是繪示第1圖習知一種具光反射牆的單個發光二極體晶片的白光封裝100的剖面圖,用來解釋上述光反射牆111的光反射面112的作用,如該第2圖所示,藍光發光二極體晶片113其射向側面的藍光參考光線A B C D以及D’ C’ B’ A’被光反射面112反射回去,激發更多前述黃光螢光粉膠114其中靠近外緣部分的螢光粉115的表面積,並且光反射面112亦將所激發螢光粉115的黃光反射出去。
第3圖是繪示另一習知一種具光反射牆的複數個發光二極體晶片的白光封裝300,其包括有基座310,基座310的上面設有光反射牆311,其內面做成光反射面312,光反射面通常為白色,此外,還有複數個藍光發光二極體晶片313,以及黃光螢光粉膠314等。其中,光反射面312能將藍光發光二極體晶片313其射向側面的藍光反射回去,激發更多前述黃光螢光粉膠314其中靠近外緣部分的 螢光粉(未圖示)的表面積,並且光反射面亦將所激發螢光粉的黃光反射出去,以增加出光效率。其光反射牆311的作用一如前述第2圖。
再者,前述這些封裝,通常是於該封裝之固著晶片的固晶台面再做成一光反射面,以將發光二極體晶片的底面的出光再反射出去,再增加出光的效率,如第1圖之固晶台面116,以及第3圖之固晶台面316。所以習知之發光二極體晶片的封裝其僅能達成正面的單面出光,以及正面的單面增加出光效率而已,無法正面及背面兩面同時出光,以及無法再進一步增加背面的出光效率。
本發明係提供一種複數個藍光發光二極體晶片的白光封裝,在一透明板的正面的單面上固著複數個藍光發光二極體晶片,並且在透明板的正面及背面兩面都設有光反射牆,以及黃光螢光粉膠,而達成在封裝的正面及背面兩面出光,並同時增加了正面及背面兩面的出光效率。
本發明一種複數個藍光發光二極體晶片的白光封裝,包括有:一透明板,具有位於相對向的一正面與一背面;複數個藍光發光二極體晶片,固著於透明板的正面;相對向的二正面光反射牆,其各斷面近似倒V字形或倒U字形,設於透明板的正面,且位於該複數個藍光發光二極體晶片的對向二外側;正面黃光螢光粉膠,填充於相對向的二正面光反射牆之間,且淹蓋住該複數個藍光發光二極體晶片;相對向的二背面光反射牆,其各斷面近似V 字形或U字形,設於透明板的背面,且位於與正面光反射牆上下垂直相對的位置;以及背面黃光螢光粉膠,填充於相對向的二背面光反射牆之間,且淹蓋住透明板的背面在相對向的二背面光反射牆之間的部分。
這樣,在透明板的正面,該複數個藍光發光二極體晶片的正面的正向光會直接向上射出去,激發正面黃光螢光粉膠其中靠近中間部分的螢光粉,正面的側向光則會被在透明板正面的正面光反射牆反射回去,激發更多正面黃光螢光粉膠其中靠近外緣部分的螢光粉的表面積,並且正面光反射牆亦將所激發螢光粉的黃光反射出去,而增加了透明板正面的出光效率。
又,在透明板的背面,複數個藍光發光二極體晶片的底面的底向光會直接向下射出去,激發背面黃光螢光粉膠其中靠近中間部分的螢光粉,底面的側向光則會被在透明板的背面光反射牆反射回去,激發更多背面黃光螢光粉膠其中靠近外緣部分的螢光粉的表面積,並且背面光反射牆亦將所激發螢光粉的黃光反射出去,而增加了透明板背面的出光效率,達成在封裝的正面及背面兩面出光,並同時增加了正面及背面兩面的出光效率之功效。
此外,上述之正面黃光螢光粉膠或背面黃光螢光粉膠除了是掺入黃光螢光粉外,亦可以再掺入少許的紅光螢光粉,以提高演色性。
100‧‧‧習知一種具光反射牆的單個發光二極體晶片的白光封裝
110‧‧‧殼體
111‧‧‧光反射牆
112‧‧‧光反射面
113‧‧‧藍光發光二極體晶片
114‧‧‧黃光螢光粉膠
115‧‧‧螢光粉
116‧‧‧固晶台面
300‧‧‧習知一種具光反射牆的複數個發光二極體晶片的白光封裝
310‧‧‧基座
311‧‧‧光反射牆
312‧‧‧光反射面
313‧‧‧藍光發光二極體晶片
314‧‧‧黃光螢光粉膠
316‧‧‧固晶台面
400‧‧‧本發明之複數個藍光發光二極體的白光封裝
410‧‧‧透明板
411‧‧‧正面
412‧‧‧背面
413‧‧‧端板
420‧‧‧藍光發光二極體晶片
421‧‧‧跳接線材
430‧‧‧正面光反射牆
431‧‧‧光反射面
440‧‧‧正面黃光螢光粉膠
441‧‧‧黃光螢光粉
450‧‧‧背面光反射牆
451‧‧‧光反射面
460‧‧‧背面黃光螢光粉膠
461‧‧‧黃光螢光粉
第1圖是繪示習知一種具光反射牆的單個發光二極體晶片的白光封裝的外觀示意圖。
第2圖是繪示第1圖習知一種具光反射牆的單個發光二極體晶片的白光封裝的的剖面圖。
第3圖是繪示另一習知一種具光反射牆的複數個發光二極體晶片的白光封裝的外觀示意圖。
第4圖是繪示本發明複數個藍光發光二極體的白光封裝的外觀示意圖。
第5圖是繪示第4圖所示本發明複數個藍光發光二極體的白光封裝的剖面圖。
有關本發明之前述及其他技術內容、特點與功效,在以下配合參考圖式之實施例詳細說明當中,將可清楚的呈現。
請參閱第4圖以及第5圖所示,依照本發明之複數個藍光發光二極體的白光封裝400包括有一透明板410、複數個藍光發光二極體晶片420、相對向的二正面光反射牆430、正面黃光螢光粉膠440、正面黃光螢光粉膠其中的黃光螢光粉441、相對向的二背面光反射牆450、背面黃光螢光粉膠460、以及背面黃光螢光粉膠其中的黃光螢光粉461。
透明板410為可以透過光線呈現清澈或略帶霧矇的板材,其材質為例如玻璃、塑膠、樹脂或氧化鋁等。透明板410界定有位於相對向的一正面411與一背面412。
複數個藍光發光二極體晶片420固著於透明板410的正面411。該複數個藍光發光二極體晶片420之電源導通,可用金線或鋁線等跳接線材421跳接各藍光發光二極體晶片420的正、負電極,使其連接成為串連電路、或並連電路、或先串連後再將各串連並連起來的電路、或先並連後再將各並連串連起來的電路,之後將該電路之最前端與最後端的藍光發光二極體晶片的一正電極和一負電極分別與固著於透明板410上的兩個端板413跳接,端板413即可以連接至電源(未圖示),以提供該些藍光發光二極體晶片420點亮所需的電源。
相對向的二正面光反射牆430設於透明板410的正面411,如第5圖所示。正面光反射牆430可用黏度較高,約3500cps(Centipoises)的白色液態矽膠,用點膠機點畫在透明板410的正面411,且位於複數個藍光發光二極體晶片420的對向二外側,白色液態矽膠經熟化後,其外形斷面會依表面張力以及對透明板410的濕潤性,各自然成形為斷面近似倒V字型或倒U字形,如第5圖剖面圖所示之正面光反射牆430形狀,足以做為光的反射面431,相對向的二正面光反射牆430與位於其中間的複數個藍光發光二極體晶片420的距離並不須精細限制,只要複數個藍光發光二極體晶片420的正面的側向光所及之處,正面光反射牆430的光反射面431都會有反射效果,其參考光線路徑如第5圖之A B C D以及D’ C’ B’ A’所示。
正面黃光螢光粉膠440的材質可為掺有黃光螢 光粉441的透明矽膠等,正面黃光螢光粉膠440於液態時填充於相對向的二正面光反射牆430之間,並淹蓋住複數個藍光發光二極體晶片420,且經熟化而定形。
再者,在透明板410的背面412設有相對向的二背面光反射牆450,如第5圖所示,其同正面光反射牆430的做法,可用黏度較高,約3500cps(Centipoises)的白色液態矽膠,用點膠機點畫在透明板410的背面412,且位於與正面光反射牆上下垂直相對的位置,白色液態矽膠經熟化後,其外形斷面會依表面張力以及對透明板410的濕潤性,各自然成形為斷面近似V字型或U字形,如第5圖剖面圖所示之背面光反射牆450形狀,足以做為光的反射面451,相對向的二背面光反射牆450的光反射面451與正面的複數個藍光發光二極體晶片420的距離並不須精細限制,只要該複數個藍光發光二極體晶片420的底面的側向光所及之處,背面光反射牆450的光反射面451都會有反射效果,其參考光線路徑如第5圖之E F G H以及H’ G’ F’ E’所示。
背面黃光螢光粉膠460的材質可為掺有黃光螢光粉461的透明矽膠等,背面黃光螢光粉膠460亦是於液態時填充於相對向的二背面光反射牆450之間,並淹蓋住透明板410的背面412在相對向的二背面光反射牆450之間的部分,且經熟化而定形。
另外,為了要讓透明板410正面411的出光和背面412的出光之色溫趨於一致,可以依調整兩面的黃光 螢光粉膠440和460所掺入黃光螢光粉441和461的比例不同而獲得。
正面黃光螢光粉膠440或背面黃光螢光粉膠460除了是掺入黃光螢光粉外,亦可以再掺入少許的紅光螢光粉(未圖示),以提高演色性。
400‧‧‧本發明複數個藍光發光二極體的白光封裝
410‧‧‧透明板
411‧‧‧正面
412‧‧‧背面
413‧‧‧端板
420‧‧‧藍光發光二極體晶片
421‧‧‧跳接線材
430‧‧‧正面光反射牆
431‧‧‧光反射面
440‧‧‧正面黃光螢光粉膠
450‧‧‧背面光反射牆
451‧‧‧光反射面
460‧‧‧背面黃光螢光粉膠

Claims (2)

  1. 一種複數個藍光發光二極體的白光封裝,包括:一透明板,具有位於相對向的一正面與一背面;複數個藍光發光二極體晶片,固著於該透明板的正面;相對向的二正面光反射牆,設於該透明板的正面,且位於該複數個藍光發光二極體晶片的對向二外側;正面黃光螢光粉膠,填充於該相對向的二正面光反射牆之間,且淹蓋住該複數個藍光發光二極體晶片;相對向的二背面光反射牆,設於該透明板的背面,且位於與該正面光反射牆上下垂直相對的位置,該背面光反射牆的斷面近似V字形或U字形;以及背面黃光螢光粉膠,填充於該相對向的二背面光反射牆之間,且淹蓋住該透明板之背面在該相對向的二背面光反射牆之間的部分。
  2. 如申請專利範圍第1項所述之一種複數個藍光發光二極體的白光封裝,其中該正面黃光螢光粉膠及/或該背面黃光螢光粉膠,還掺有少許的紅光螢光粉,以提高演色性。
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