TFT-LCD衝擊之分析與結構改良設計｜國立清華大學博碩士論文庫

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研究生：	蔡宗軒 Chung-Hsuan Tsai
論文名稱：	TFT-LCD衝擊之分析與結構改良設計 Impact Analysis and Structural Improvement of TFT-LCD Module
指導教授：	宋震國 Cheng-Kuo Sung
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 動力機械工程學系 Department of Power Mechanical Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	中文
論文頁數：	90
中文關鍵詞：	衝擊試驗、有限單元法
外文關鍵詞：	TFT-LCD, LS-DYNA, impact/shock experiment, finite element method
相關次數：	點閱：1 下載：0
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本研究針對TFT-LCD液晶面板在螺栓與外殼鎖附位置受到半弦波衝擊外力下，探討面板模組中各元件之衝擊動態響應，進而就面板對於衝擊外力有損壞之虞的部分進行改良設計。首先經由簡化假設建立液晶面板模組之模型，由能量法（Lagrange’s equation）推導其運動方程式，了解其簡易模型在半弦波之衝擊外力下之動態特性。再利用有限單元法之專業動態分析軟體ANSYS LS-DYNA進行液晶面板的模型建立，並且依據衝擊實驗對照相同的邊界條件設定與外力輸入以進行運算模擬，藉此了解液晶面板模組在受到各方向衝擊時各元件的動態行為與等效應力分布。
　　然而由衝擊實驗與模擬結果可以發現本研究使用之液晶面板模組在受到半弦波衝擊外力時，分布於鋁框與膠框周邊的卡榫有脫離的現象發生。根據其脫離之機制與自由度拘束上的討論，本研究嘗試使用高剛性的材料替代鋁框以及在卡榫上建立另一自由度拘束之擋牆來減少脫離的情形發生。

This study is concerned with the dynamic response of TFT-LCD modules that are struck by a half-sine impact acceleration through the bolts connecting with the LCD display module. Then, an improvement is performed by redesigning the parts that may possibly be damaged under the impact. First, we establish a simplified model of the panel structures of the TFT-LCD by several reasonable assumptions, and then develop the dynamic equations by Lagrange’s method for the purpose of understanding the impact dynamic characteristics. We also construct the finite element model of the panel structures of the TFT-LCD by the professional finite element software, ANSYS LS-DYNA, and set the boundary conditions and impact forces in accordance with the impact experiment. By analyzing the results of the impact simulation, we can observe the displacements and distributions of von-Mises stresses of each component of TFT-LCD modules.
Comparing the half-sine impacting simulation with experiment, the joints between the frame and bezel around the TFT-LCD panel modules occur to separate. In this study, according to the causes of separation reason and the constraints of the motion degrees of freedom, we employ a material with higher rigidity to replace the original material of the bezel, and design a block on the joint to constrain another degrees of freedom to prevent the joints from separation.

目錄
中文摘要…………………………………………………………….    Ⅰ
英文摘要…………………………………………………………….    Ⅱ
目錄………………………………………………………………….    Ⅲ
圖目錄……………………………………………………………….    Ⅴ
表目錄……………………………………………………………….    Ⅷ
第一章 緒論………………………………………………………...    1
1-1 研究動機.............................................................................    1
1-2 文獻回顧.............................................................................    4
1-2-1衝擊運動之理論與分析...........................................    5
1-2-2衝擊試驗及有限單元法之衝擊模擬.......................    7
1-3本文內容...............................................................................    10
第二章 理論基礎...............................................................................    13
2-1 系統假設與模型說明.........................................................    13
2-2 衝擊外力形式.....................................................................    17
2-3運動方程式推導...................................................................    18
    2-3-1  TFT-LCD在X向及Y向衝擊之運動方程式.....    19
    2-3-2  TFT-LCD在Z向衝擊之運動方程式...................    27
2-4 彎曲應力響應.....................................................................    34
第三章 衝擊實驗...............................................................................    45
3-1 實驗規劃.............................................................................    45
3-2 實驗設備.............................................................................    46
3-2-1  衝擊試驗機............................................................    46
3-2-2  治具........................................................................    49
    3-2-3  TFT-LCD................................................................    50
3-3 實驗流程.............................................................................    51
第四章 有限單元法分析之衝擊模擬與分析...................................    52
4-1模型建立...............................................................................    52
4-2 參數設定.............................................................................    57
4-2-1 構件單元類型..........................................................    57
4-2-2 構件材料參數..........................................................    60
4-3 邊界條件設定.....................................................................    62
4-4模擬結果討論......................................................................    66
    4-4-1 X向衝擊結果...........................................................    66
    4-4-1 Y向衝擊結果............................................................    70
    4-4-1 Z向衝擊結果............................................................    73
第五章 卡榫分析與改良設計...........................................................    76
5-1卡榫模擬結果討論...............................................................    76
5-2 卡榫脫離改善與模擬結果討論.........................................    80
第六章 結論與未來工作...................................................................    85
    6-1 結論.....................................................................................    85
    6-2 未來工作.............................................................................    87
參考文獻.............................................................................................    89
 
圖目錄
圖1-1  液晶顯示器的Mura現象…………………………………    2
圖1-2  撓性薄平板邊界受衝擊外力示意圖……..………………    5
圖1-3  雙殼式的電子產品結構……..……………………………    6
圖1-4　雙殼式系統之對應物理模型…..…………………………    6
圖1-5  傳呼機FEM之模型落下示意圖…………………………    7
圖1-6  利用夾具針對不同角度挾持……………………………..    8
圖1-7  落下模擬與落下實驗的比對……………………………..    8
圖1-8  面板受衝擊位置與衝擊外力形式………………………..    9
圖1-9  LCD面板受衝擊產生的應力分布示意圖……………….    10
圖2-1　液晶面板之鋁框（Bezel）……………….……………….    14
圖2-2　液晶面板之膠框（Frame）……………….……………….    14
圖2-3　液晶面板之玻璃面板（Glass substrate）………………..    14
圖2-4　鋁框、膠框及玻璃面板組合示意圖……………………..    15
圖2-5  液晶面板X向及Y向衝擊剖面圖……………………….    15
圖2-6  液晶面板Z向衝擊剖面圖………………………………..    16
圖2-7  半弦波衝擊加速度………………………………………..    17
圖2-8  液晶面板X向及Y向模型示意圖……………………….    18
圖2-9  液晶面板Z向模型示意圖……………….……………….    18
圖3-1  衝擊試驗機……………….………………. ……………...    48
圖3-2  衝擊試驗機示意圖……………….……………………….    48
圖3-3  治具示意圖……………….……………….………………    49
圖3-4  TFT-LCD模組……………….……………….……………    50
圖3-5  衝擊試驗實驗流程圖……………….……………….……    51
圖4-1  側光源式與直下式背光模組……………….…………….    52
圖4-2  鋁框（Bezel）……………….……………….………………    55
圖4-3  液晶面板（LCD panel）……………….……………….…    55
圖4-4  導光板（LGP）……………….……………….………….    55
圖4-5  燈罩（Lamp reflector）……………….……………….……    55
圖4-6  燈管（Lamp）……………….……………….……………    56
圖4-7  膠框（Frame）……………….……………….…………..    56
圖4-8  燈管撐架（Lamp bracket）……………….……………….    56
圖4-9  液晶面板構件網格化結果……………….……………….    58
圖4-10  構件網格化後的組合情形……………….………………    59
圖4-11  鋁框模態振型分析……………….……………….……..    60
圖4-12  構件模態測試流程……………….……………….……..    61
圖4-13  衝擊外力輸入位置……………….……………….……..    63
圖4-14  240G 2ms半弦波加速度衝擊……………….…………..    63
圖4-15  螺栓鎖附情形……………….……………….…………..    64
圖4-16  利用樑元素連接燈管與燈罩……………….……………    65
圖4-17  X向衝擊響應……………….……………….…………...    68
圖4-18  玻璃基板與導光板受+X方向衝擊……………….…….    69
圖4-19  膠框與鋁框受+X方向衝擊……………….…………….    69
圖4-20  燈管組受+X方向衝擊……………….……………….…    69
圖4-21  Y向衝擊響應……………….……………….…………...    71
圖4-22  玻璃基板與導光板受+Y方向衝擊……………….…….    72
圖4-23  膠框與鋁框受+Y方向衝擊……………….…………….    72
圖4-24  燈管組受+Y方向衝擊……………….………………….    72
圖4-25  Z向衝擊響應……………….……………….……………    74
圖4-26  玻璃基板與導光板受+Z方向衝擊……………….……..    75
圖4-27  膠框與鋁框受+Z方向衝擊……………….……………..    75
圖4-28  燈管組受+Z方向衝擊……………….…………………..    75
圖5-1  液晶面板卡榫自由度示意圖……………….…………….    76
圖5-2  卡榫位置分布……………….……………….…………….    77
圖5-3  卡榫衝擊初期(a)與結束(b)變化圖……………….………    78
圖5-4  鋁框與膠框在卡榫中的r方向位移變化圖………………    79
圖5-5  改變材料後卡榫衝擊時初期(a)與結束(b)變化圖………..    81
圖5-6  改變鋁框材料參數後卡榫r方向位移變化圖……………    81
圖5-7  在卡榫上加擋牆增加自由度限制………………………..    82
圖5-8  增加限制後卡榫衝擊時初期(a)與結束(b)變化圖………..    83
圖5-9  增加限制後卡榫r方向位移變化圖………………………    83
圖5-10  限制自由度後鋁框發生高應力區域……………………    84

 
表目錄
表2-1  平板參數表………………………………………………..    35
表3-1  衝擊試驗機規格…………………………………………..    47
表3-2  梯形波及半弦波衝擊外力規格…………………………..    47
表3-3　TFT-LCD規格…………………………………………….    50
表4-1  構件使用之單元類型與節點數…………………………..    58
表4-2  TFT-LCD各構件之材料參數…………………………….    61
表4-3  連接元件材料參數………………………………………...    65

                                

參考文獻
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[2] E. Suhir, “Nonlinear Dynamic Response of a Flexible Printed Circuit Board to Periodic Shock Loads Applied to its Support Contour,” ASME J. Appl. Mechanics, vol. 5g, no. 1, 1992.
[3] E. Suhir and R. Burke, “Dynamic Response of a Rectangular Plate to a Shock Load, with Application to Portable Electronic Products,” IEEE Trans. Comp. Packag., Manufact. Technol., vol. 17, no. 3, 1994.
[4] Chwee-Teck Lim, Y. M. Teo, and V. P. Shim, “Numerical Simulation of the Drop Impact Response of a Portable Electronic Product,” IEEE Transactions Components and Packaging Technologies, Vol. 25, No. 3, September 2002.
[5] Lim C. T. and Low Y. J., “Investigating the Drop Impact of Portable Electronic Products,” IEEE Electronic Components and Technology Conference, 2002.
[6] J. G. Kim and Y. K. Park, “Experimental Verification of Drop/Impact Simulation for a Cellular Phone,” Society for Experimental Mechanics, 2004.
[7] Seong-Sik Choi and Jeoung-Gwen Lee, “Structural Design Review of LCD-TV Module by Impact Analysis,” 4th European LS-DYNA Users Conference, 2003.
[8] Lin Morson, “The Finite Element Analysis for LGP Strength in TFT-LCD Module,” Chi Mei Optoelectronics Corp., 2004.
[9] Chang Chin-Kun, “The FEM Analysis for Mold Frame Design of TFT-LCD Module,” Chi Mei Optoelectronics Corp., 2005.
[10] Eddy Tsai, “Backlight Structure,” AUO, 2004.
[11] 王志宏教授與其實驗室針對TFT-LCD之燈管所實驗量測之材料參數.
[12] Singiresu S.Roa, “Mechanical Vibrations,” 3rd ed., Addison-Wesley Publishing Company, 1995.
[13] William T. Thomson, “Theory of Vibration with Applications,” 4th ed., Prentice Hall, 1993.
[14] S. Timoshenko, D. H. Young and W. Weaver, “Vibration Problems in Engineering,” 4th ed., 1974.
[15] Giancarlo Genta, “Vibration of Structures and Machines,” 2nd ed., Springer-Verlag, 1995.
[16] S. Timoshenko and S. Woinowsky-Krieger, “Theory of Plates and Shells,” 2nd ed., Mcgraw-Hill Book Co., 1959.

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