JP2006091234A - 電子部品の実装構造、電子部品の実装方法、電気光学装置および電子機器 - Google Patents
電子部品の実装構造、電子部品の実装方法、電気光学装置および電子機器 Download PDFInfo
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- JP2006091234A JP2006091234A JP2004274625A JP2004274625A JP2006091234A JP 2006091234 A JP2006091234 A JP 2006091234A JP 2004274625 A JP2004274625 A JP 2004274625A JP 2004274625 A JP2004274625 A JP 2004274625A JP 2006091234 A JP2006091234 A JP 2006091234A
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Abstract
【解決手段】 樹脂突起121Baの少なくとも頂部を覆うように導電膜121Bbが形成されたバンプ電極121Bを有する電子部品121と、接続端子111bxを有する相手側基板111とを備え、電子部品121と相手側基板111との隙間に封止樹脂122が充填されており、かつ、バンプ電極121Bが接続端子111bxに当接されてなる電子部品の実装構造であって、電子部品121の使用環境温度T0、樹脂突起のガラス転移温度Tgbおよび封止樹脂122のガラス転移温度Tgrが、T0<Tgr<Tgbの関係を満たす構成とした。
【選択図】 図4
Description
特に、前記第1樹脂のTgb以下での熱膨張係数αb1および前記第2樹脂のTgr以下での熱膨張係数αr1が、αb1<αr1の関係を満たすことが望ましい。
これらの構成によれば、バンプ電極と接続端子との導通接触状態を確保することができるので、電気的接続の信頼性を向上させることができる。
また、前記第2樹脂の硬化温度をTcとして、T0<Tgr<Tgb<Tcの関係にある場合に、前記第1樹脂のTgb以上での熱膨張係数αb2およびTgb以下での熱膨張係数αb1、並びに前記第2樹脂のTgr以上での熱膨張係数αr2およびTgr以下での熱膨張係数αr1が、αb2(Tc−Tgb)+αb1(Tgb−T0)<αr2(Tc−Tgr)+αr1(Tgr−T0)の関係を満たすことが望ましい。
これらの構成によれば、第2樹脂の硬化温度Tcから電子部品の使用環境温度T0までの冷却過程において、第1樹脂および第2樹脂の高さが減少(収縮)した場合でも、使用環境温度T0においてバンプ電極が接続端子に押圧された状態とすることができる。したがって、電気的接続の信頼性を向上させることができる。
この構成によれば、バンプ電極と接続端子との導通接触状態を確保することができるので、電気的接続の信頼性を向上させることができる。
この構成よれば、バンプ電極が接続端子に押圧された状態とすることができるので、電気的接続の信頼性を向上させることができる。
この構成によれば、電気的接続の信頼性を向上することが可能な電子部品の実装構造を備えているので、電気的接続の信頼性に優れた電気光学装置を提供することができる。
この構成によれば、電気的接続の信頼性に優れた電子機器を提供することができる。
図1は、実施形態に係る電気光学装置の分解斜視図である。
図1の液晶装置100は、液晶パネル110と、電子部品(液晶駆動用ICチップ)121とを有する。また、必要に応じて、図示しない偏光板、反射シート、バックライト等の付帯部材が適宜に設けられる。
また、電極112aも同様に、同じ材質で一体に形成された配線112bに接続され、図示しない上下導通部を介して基板111上の配線111cに導電接続されている。この配線111cも、上記と同じITOで構成されている。そして、配線111cは基板張出部111T上に引き出され、その先端は端子111cxとなっている。
図2は、図1の電子部品の実装部分における側面断面図である。図2に示すように、電子部品121の表面(図2の下面)には、IC側端子として複数のバンプ電極121Bが設けられている。その先端は、上記基板111の端子111bx、111cx,111dx(111cxは図2には示していない。図1参照。以下同様。)に導電接触した状態となっている。また、バンプ電極121Bと端子111bx、111cx,111dxとの間の導電接触部分の周囲には、熱硬化性樹脂などで構成される硬化された封止樹脂122が充填されている。
この導電膜121Bbは、少なくとも樹脂突起121Baの頂部を覆うように形成され、これらの樹脂突起121Baおよび導電膜121Bbにより、前述したバンプ電極(樹脂コアバンプ)121Bが構成されている。このバンプ電極121Bは、電子部品121の表面において半球状に突出形成されている。
図5および図6は、樹脂突起の自由高さおよび封止樹脂の高さと温度との関係を表すグラフである。ここに言う樹脂突起の自由高さとは、実装前の状態における樹脂突起の高さであり、図3に示すバンプ電極121Bの高さHに略一致するものである。また封止樹脂の高さとは、図4に示すように、電子部品121における保護膜の表面と相手側基板111における接続端子111bxの表面との間に充填された封止樹脂122の高さDであり、実装後の状態における樹脂突起の高さと略一致するものである。なお、図5および図6において、Tcは封止樹脂の硬化温度であり、T0は電子部品の使用環境温度である。電子部品の使用環境温度とは、例えば製品仕様書、説明書等に記載される電子部品の動作補償範囲内の温度とされる。
R2+R1=αr2(Tc−Tgr)+αr1(Tgr−T0) ‥(式2)
また、同じ冷却過程における樹脂突起の自由高さの変化(収縮量)は、以下のようになる。
B1=αb1(Tc−T0) ‥(式3)
αb1(Tc−T0)<αr2(Tc−Tgr)+αr1(Tgr−T0) ‥(式4)
すなわち、式1の場合には式4を満たすように樹脂突起および封止樹脂の材料を選定すればよい。
R2+R1=αr2(Tc−Tgr)+αr1(Tgr−T0) ‥(式6)
また、同じ冷却過程における樹脂突起の自由高さの変化(収縮量)は、以下のようになる。
B2+B1=αb2(Tc−Tgb)+αb1(Tgb−T0) ‥(式7)
αb2(Tc−Tgb)+αb1(Tgb−T0)
<αr2(Tc−Tgr)+αr1(Tgr−T0) ‥(式8)
すなわち、式5の場合には式8を満たすように樹脂突起および封止樹脂の材料を選定すればよい。
図7は、バンプ電極に初期圧縮を与えた実装構造の側面断面図である。図7に示すように、樹脂突起121Baを圧縮変形させた状態で封止樹脂122を硬化させ、電子部品121と相手側基板111との相対位置を固定してもよい。この場合、図5および図6における樹脂突起の自由高さのグラフが上方にシフトすることになり、使用環境温度T0における樹脂突起の自由高さと封止樹脂の高さとの差Pが大きくなる。したがって、使用環境においてバンプ電極が接続端子に強く押圧された状態となり、電気的接続の信頼性を向上させることができる。
最後に、図10及び図11を参照して、本実施形態に係る電子機器について説明する。本実施形態では、上述した電気光学装置(液晶装置100)を表示手段として備えた電子機器について説明する。図10は、本実施形態の電子機器における液晶装置100に対する制御系(表示制御系)の全体構成を示す概略構成図である。ここに示す電子機器は、表示情報出力源291と、表示情報処理回路292と、電源回路293と、タイミングジェネレータ294と、光源制御回路295とを含む表示制御回路290を有する。また、上記と同様の液晶装置100には、上述の構成を有する液晶パネル110を駆動する駆動回路110Dが設けられている。この駆動回路110Dは、上記のように液晶パネル110に直接実装されている半導体ICチップで構成される。ただし、駆動回路110Dは、上記のような構成の他に、パネル表面上に形成された回路パターン、或いは、液晶パネルに導電接続された回路基板に実装された半導体ICチップ若しくは回路パターンなどによっても構成することができる。
Claims (8)
- 第1樹脂からなる突起体の少なくとも頂部を覆うように導電膜が形成されたバンプ電極を有する電子部品と、接続端子を有する相手側基板とを備え、
前記電子部品と前記相手側基板との隙間に第2樹脂が充填されており、かつ、前記バンプ電極が前記接続端子に当接されてなる電子部品の実装構造であって、
前記相手側基板に実装された前記電子部品の使用環境温度をT0とした場合に、前記第1樹脂のガラス転移温度Tgbおよび前記第2樹脂のガラス転移温度Tgrが、
T0<Tgr<Tgb
の関係を満たすことを特徴とする電子部品の実装構造。 - 前記第1樹脂のTgb以下での熱膨張係数αb1および前記第2樹脂のTgr以下での熱膨張係数αr1が、
αb1<αr1
の関係を満たすことを特徴とする請求項1に記載の電子部品の実装構造。 - 前記第2樹脂の硬化温度をTcとして、
T0<Tgr<Tc<Tgb
の関係にある場合に、
前記第1樹脂のTgb以下での熱膨張係数αb1、並びに第2樹脂のTgr以上での熱膨張係数αr2およびTgr以下での熱膨張係数αr1が、
αb1(Tc−T0)<αr2(Tc−Tgr)+αr1(Tgr−T0)
の関係を満たすことを特徴とする請求項1に記載の電子部品の実装構造。 - 前記第2樹脂の硬化温度をTcとして、
T0<Tgr<Tgb<Tc
の関係にある場合に、
前記第1樹脂のTgb以上での熱膨張係数αb2およびTgb以下での熱膨張係数αb1、並びに前記第2樹脂のTgr以上での熱膨張係数αr2およびTgr以下での熱膨張係数αr1が、
αb2(Tc−Tgb)+αb1(Tgb−T0)
<αr2(Tc−Tgr)+αr1(Tgr−T0)
の関係を満たすことを特徴とする請求項1に記載の電子部品の実装構造。 - 第1樹脂からなる突起体の少なくとも頂部を覆うように導電膜が形成されたバンプ電極を有する電子部品と、接続端子を有する相手側基板とを備え、
前記電子部品と前記相手側基板との隙間に第2樹脂が充填されており、かつ、前記バンプ電極が前記接続端子に当接されてなる電子部品の実装方法であって、
前記相手側基板に実装された前記電子部品の使用環境温度をT0とした場合に、前記第1樹脂のガラス転移温度Tgbおよび前記第2樹脂のガラス転移温度Tgrが、
T0<Tgr<Tgb
の関係を満たす前記第1樹脂および前記第2樹脂を用いて、前記電子部品を実装することを特徴とする電子部品の実装方法。 - 硬化前の前記第2樹脂を介して、前記バンプ電極を前記接続端子に加圧し、前記バンプ電極を弾性変形させた状態で、前記第2樹脂を硬化させることを特徴とする請求項5に記載の電子部品の実装方法。
- 請求項1ないし請求項4のいずれかに記載の電子部品の実装構造を備えたことを特徴とする電気光学装置。
- 請求項7に記載の電気光学装置を備えたことを特徴とする電子機器。
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US11/216,807 US7161245B2 (en) | 2004-09-22 | 2005-08-31 | Electronic component-mounted structure, method for mounting electronic component, electro-optical device, and electronic apparatus |
KR1020050087556A KR100661694B1 (ko) | 2004-09-22 | 2005-09-21 | 전자 부품의 실장 구조, 전자 부품의 실장 방법, 전기 광학장치 및 전자기기 |
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