JP2006189815A - 熱伝導シート、その製造方法及びこれを用いた液晶表示装置の製造方法 - Google Patents
熱伝導シート、その製造方法及びこれを用いた液晶表示装置の製造方法 Download PDFInfo
- Publication number
- JP2006189815A JP2006189815A JP2005352813A JP2005352813A JP2006189815A JP 2006189815 A JP2006189815 A JP 2006189815A JP 2005352813 A JP2005352813 A JP 2005352813A JP 2005352813 A JP2005352813 A JP 2005352813A JP 2006189815 A JP2006189815 A JP 2006189815A
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- conductive sheet
- heat conductive
- glass fiber
- liquid crystal
- crystal display
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
- E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
- E05C19/08—Hasps; Hasp fastenings; Spring catches therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/02—Layered products essentially comprising sheet glass, or glass, slag, or like fibres in the form of fibres or filaments
- B32B17/04—Layered products essentially comprising sheet glass, or glass, slag, or like fibres in the form of fibres or filaments bonded with or embedded in a plastic substance
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- E—FIXED CONSTRUCTIONS
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- E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
- E05C19/02—Automatic catches, i.e. released by pull or pressure on the wing
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- G—PHYSICS
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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Abstract
【解決手段】
本発明は、熱伝導シートとその製造方法、及びこれを利用した液晶表示装置の製造方法に関する。本発明による熱伝導シートは、ガラス繊維と、該ガラス繊維を取り囲み、シリコン、テフロン樹脂及び金属が混合されているコーティング層とを含むことを特徴とする。
【選択図】図1
Description
液晶表示装置は、その他にもゲート線とデータ線とに駆動信号を印加するためのゲート駆動回路、データ駆動回路及び回路基板(PCB)などをさらに含む。回路基板にはタイミングコントローラ(timing controller)と駆動電圧発生部などが設けられている。
リードとパッドとをボンディングする方法は、次の通りである。
まず、薄膜トランジスタ基板のパッド上に異方性導電フィルムを配置する。
次に、パッドに対応するように駆動回路のリードを位置させる。この時、異方性導電フィルムはパッドとリードとの間に配置する。
ところが、テフロンシートは、熱伝導性が不良であるため、加熱ツールの温度を高くしなければならない。また、耐久性が不良であるため再使用が困難である。さらに、熱により歪みや折り、垂れなどが生じ、パッドとリードとの間のミスアライメントを誘発する恐れがある。
また、本発明の他の目的は、耐久性と熱伝導性とに優れた熱伝導シートの製造方法を提供することにある。
さらに、本発明の他の目的は、耐久性と熱伝導性とに優れた熱伝導シートを用いて液晶表示装置を製造する方法を提供することにある。
前記金属の一実施形態として、前記金属はアルミニウム(Al)とすることができる。
前記コーティング層の一実施形態として、前記コーティング層に前記シリコン(Si)100重量部に対し、前記テフロン樹脂が80〜120重量部、前記金属が80〜120重量含まれることが好ましい。
前記粒子がガラス繊維に浸透していることが好ましい。
前記ガラス繊維に浸透した粒子は、ガラス繊維表面から中心部へ行くほど少なくなることが好ましい。
本発明の一実施形態による熱伝導シートは、厚さが0.15〜0.25mm、引張強度が300kgf/cm2以上、伸び率が10%以下、及び/又は表面電気抵抗が1010Ω以下とすることができる。
本発明による熱伝導シートの製造方法は、シリコン、テフロン樹脂、金属を含むコーティング組成物を準備する工程と、ガラス繊維と前記コーティング組成物を熱間圧着する工程とを含む。
本発明による液晶表示装置のガラス繊維と、該ガラス繊維の内部及び外部に位置し、シリコン、テフロン、金属が分散されているコーティング層を含む熱伝導シートを準備する工程と、液晶表示パネルのパッド上に導電性フィルム、駆動回路と接続されたリード及び前記熱伝導シートを順次に配置する工程と、前記熱伝導シートと接触する加熱ツールを利用して前記パッドと前記リードを相互加圧する工程とを含む。
前記相互加圧の際に前記熱伝導シート温度の一実施形態として、前記温度は250〜300℃とすることができる。
また、これを用いてリードとパッドとの間のボンディングを安定的に形成することができる液晶表示装置の製造方法を提供することができる。
図1は、本発明の第1実施形態による熱伝導シート1の断面図である。
熱伝導シート1は、ガラス繊維2と、該ガラス繊維2を取り囲み、テフロン樹脂3、アルミニウム粒子4、シリコン5を含むコーティング層6とからなる。また、コーティング層6の粒子はガラス繊維2の内部にも浸透している。
シリコン5は熱伝導シート1の形状補正性の特性を向上させる。ボンディング過程の加圧時に熱伝導シート1はパッド周辺の段差によって影響を受ける。この時、熱伝導シート1が適切に変形しないと、異方性導電フィルムの導電粒子が円滑に圧着されない。シリコン5は、加圧過程で熱伝導シート1がパッド周辺の段差によって適切に変形できるようにし、異方性導電フィルムとパッドとが密着するようにする。
適切な耐久性を有するために、ASTM D638に基づく熱伝導シート1の引張強度は300kgf/cm2以上であるのが好ましい。また、ボンディング過程で変形が生じないように、ASTM D638に基づく熱伝導シート1の伸び率は10%以下であるのが好ましい。適切な熱伝導度を維持するために、熱伝導シート1の表面電気抵抗は1010Ωcm2以下であるのが好ましい。
このような第1実施形態による熱伝導シート1と従来のテフロンシートとの物性は、表1の通りである。従来のテフロンシートはPTFEである。
しかし、引張強度では熱伝導シート1と熱伝導シート2はいずれも416.2kgf/cm2であって、従来のテフロンシートの140kgf/cm2より大きく高い値を示した。引張強度が高いということは、耐久性に優れたことを意味する。実際にTAB−ICボンディングに適用した結果、従来のテフロンシートは1回だけ使用可能であったが、熱伝導シート1と熱伝導シート2とは10回以上使用が可能であった。熱伝導シート1と熱伝導シート2の引張強度が高いことは、ガラス繊維2を含むためである。
第1実施形態とは異なって、ガラス繊維2の中間部分Aにコーティング層6の密度が減少している。これは熱伝導シート1の製造時の温度と圧力によるものである。熱伝導シート1の製造過程については後述する。
以上の熱伝導シート1は種々の変形が可能である。例えば、アルミニウム粒子4は他の金属粒子と並行して使用してもよいし、他の金属粒子に代替することができる。また、コーティング層6内のテフロン樹脂3、アルミニウム粒子4、シリコン5の分布は位置によって種々変化させることができる。
まず、ガラス繊維2とコーティング組成物を準備する。コーティング組成物はテフロン樹脂3、金属粒子4及びシリコン5を含み、ペースト状または粉末状とすることができる。
ガラス繊維2とコーティング組成物とを相互熱間圧着して、ガラス繊維2とコーティング組成物とを結合させる。熱間圧着の温度は400〜600℃であるのが好ましい。この過程でコーティング組成物は相互混合され一体になってコーティング層6となる。コーティング層6はガラス繊維2の外側部分だけでなく、ガラス繊維2の内部にまで位置する。熱間圧着の条件によってガラス繊維2の内側に位置するコーティング層6の量を変化させることができる。
以下、本発明の第1実施形態による液晶表示装置について、図3〜図5を参照して説明する。
液晶表示装置は、薄膜トランジスタ基板20とカラーフィルタ基板30を含む液晶パネル10、薄膜トランジスタ基板20の外郭に付着されているCOF40及び該COF40に接続されている回路基板51、53を含む。その他に、薄膜トランジスタ基板20とカラーフィルタ基板30間に位置する液晶層71を含み、場合によって薄膜トランジスタ基板20の背面にバックライトユニット(図示せず)をさらに含むことができる。
以下、ゲートパッド21と接続されているゲート線を駆動するための構成を中心に説明する。これはデータパッド22と接続されているデータ線を駆動するための構成にも適用できる。
基板素材31上にブラックマトリックス32とカラーフィルタ層33が設けられている。ブラックマトリックス32は一般に赤色、緑色、青色画素の間を区分し、薄膜トランジスタTへの直接的な光照射を遮断する役割を果たす。ブラックマトリックス32は黒色顔料が添加された感光性有機物質からなりうる。前記黒色顔料としてはカーボンブラックやチタニウムオキシドなどを使用する。
カラーフィルタ層33と、該カラーフィルタ層33が覆っていないブラックマトリックス32の上部にはオーバーコート膜34が形成されている。オーバーコート膜34はカラーフィルタ層33を保護する役割を果たし、通常、アクリル系エポキシ材料が多く使用される。
その他に、薄膜トランジスタ基板20とカラーフィルタ基板30の外部面には、偏光板25、36がそれぞれ付着されている。液晶71は両基板20、30と、両基板20、30の縁部に沿って形成されており、両基板20、30を相互接着するシラント81に取り囲まれた空間内に存在しながら、COF40の駆動信号にしたがってその整列状態が変化する。
COF40は、入力リード43と出力リード44などの配線層、駆動回路(駆動回路、42)、及びこれらを実装しているフィルム41を含む。駆動回路42は、入力リード43と出力リード44両方に接続されている。入力リード43は回路基板51の信号パッド52と接続されており、出力リード44はゲートパッド21と接続されている。各リード43、44と各パッド52、21は導電性フィルム60を通じて電気的に接続されている。導電性フィルム60は樹脂層61とここに分散されている導電粒子62からなり、導電粒子62が各リード43、44と各パッド52、22を電気的に接続している。ゲートパッド21の中央部分には保護膜26が除去されており、ITOまたはIZOからなる接触部材27が覆っている。ゲートパッド21と出力リード44は導電粒子62と接触部材27を通じて接続されている。
まず、図6Aに示すように、ゲートパッド21の上部に異方性導電フィルム60を配置する。この時、ゲートパッド21の上部は絶縁膜26が除去されており、上部には接触部材27が形成されている。このようにゲートパッド21周辺には段差が形成されている。ここで、ゲートパッド21の上部には絶縁膜26以外に保護膜などをさらに除去することができ、必ずしも接触部材33が形成されていなくてもよい。
ボンディングに使用された熱伝導シート1は、耐久性が優れているので、再使用が可能である。
2 ガラス繊維
3 テフロン樹脂
4 アルミニウム粒子
5 シリコン
6 コーティング層
21 ゲートパッド
22 データパッド
40 COF
41 フィルム
42 駆動回路
43 入力リード
44 出力リード
51、53 回路基板
60 導電性フィルム
61 樹脂層
62 導電粒子
Claims (18)
- ガラス繊維と、
該ガラス繊維を取り囲んで配置された、シリコン、テフロン樹脂及び金属が混合されてなるコーティング層とを含む熱伝導シート。 - 前記金属はアルミニウムである請求項1に記載の熱伝導シート。
- 前記コーティング層には、前記シリコン100重量部に対し、前記テフロン樹脂が80〜120重量部、前記金属が80〜120重量部含まれている請求項1又は2に記載の熱伝導シート。
- 前記シリコン、テフロン樹脂及び/又は金属が粒子状で混合されている請求項1〜3のいずれか1つに記載の熱伝導シート。
- 前記粒子がガラス繊維に浸透してなる請求項4に記載の熱伝導シート。
- 前記ガラス繊維に浸透した粒子は、ガラス繊維表面から中心部へ行くほど少なくなる請求項5に記載の熱伝導シート。
- 前記ガラス繊維の厚さが0.05〜0.15mmである請求項1〜6のいずれか1つに記載の熱伝導シート。
- 熱伝導シートの厚さが0.15〜0.25mmである請求項1〜7のいずれか1つに記載の熱伝導シート。
- 熱伝導シートの引張強度が300kgf/cm2以上である請求項1〜8のいずれか1つに記載の熱伝導シート。
- 熱伝導シートの伸び率が10%以下である請求項1〜9のいずれか1つに記載の熱伝導シート。
- 熱伝導シートの表面電気抵抗が1010Ωcm2以下である請求項1〜10のいずれか1つに記載の熱伝導シート。
- 前記テフロン樹脂は連続形状をなしている請求項1〜11のいずれか1つに記載の熱伝導シート。
- シリコン、テフロン樹脂及び金属を含むコーティング組成物を準備する工程と、
ガラス繊維と前記コーティング組成物を熱間圧着する工程とを含むことを特徴とする熱伝導シートの製造方法。 - 前記熱間圧着の温度は400〜600℃である請求項13に記載の熱伝導シートの製造方法。
- ガラス繊維と、該ガラス繊維の内部及び外部に位置し、シリコン、テフロン及び金属が分散されているコーティング層を含む熱伝導シートを準備する工程と、
液晶表示パネルのパッド上に導電性フィルム、駆動回路と接続されたリード及び前記熱伝導シートを順次に配置する工程と、
前記熱伝導シートと接触する加熱ツールを利用して前記パッドと前記リードとを相互加圧する工程とを含むことを特徴とする液晶表示装置の製造方法。 - 前記金属はアルミニウムである請求項15に記載の液晶表示装置の製造方法。
- 前記相互加圧の際に前記加熱ツールの設定温度を370〜390℃にする請求項15又は16に記載の液晶表示装置の製造装置。
- 前記相互加圧の際に前記熱伝導シートの温度を250〜300℃にする請求項15〜17のいずれか1つに記載の液晶表示装置の製造装置。
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TWI618910B (zh) * | 2009-08-06 | 2018-03-21 | 楊泰和 | 具不同熱特性交叉結構熱導裝置 |
JP6110104B2 (ja) * | 2012-11-01 | 2017-04-05 | 中興化成工業株式会社 | 複合体 |
US10170403B2 (en) * | 2014-12-17 | 2019-01-01 | Kinsus Interconnect Technology Corp. | Ameliorated compound carrier board structure of flip-chip chip-scale package |
WO2017122817A1 (ja) | 2016-01-14 | 2017-07-20 | デクセリアルズ株式会社 | 熱伝導シート、熱伝導シートの製造方法、放熱部材及び半導体装置 |
JP6259064B2 (ja) * | 2016-01-14 | 2018-01-10 | デクセリアルズ株式会社 | 熱伝導シート、熱伝導シートの製造方法、放熱部材及び半導体装置 |
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