手機液晶顯示器模組之落下行為分析

Investigation on the Drop Behavior of Mobile Phone LCD Module

陳國春(Kuo-Chun Chen)

指導教授 ： 陳政順

國立臺北科技大學/機電學院/製造科技研究所/碩士(2010年)

摘要

本文的研究目的為液晶顯示器於彎曲及落下試驗中的機械行為分析。藉由單獨液晶顯示器模組的彎曲試驗，分析結構在縱向、橫向、左斜方及右斜方等4個方向之力量位移關係與破裂現象。然後分析整個手機在液晶顯示器面朝下，進行高度150 cm落下試驗的碰撞行為；同時考慮不同厚度之緩衝材對其結構之影響即對液晶顯示器的保護效果。在本研究個案，在彎曲試驗與有限元素模擬之研究結果顯示，在縱向垂直方向上的抗壓強度較差，即在縱向方向受壓時比較容易先行破裂。在整個手機在液晶顯示器面朝下之落下試驗時，結果顯示無置入泡棉的液晶顯示器模組，在落下試驗後，會發生破裂現象的機率為75%；加入0.4 mm、0.6 mm厚度的泡棉則損壞機率分別降至25%，而加入厚度為0.8 mm，則四次落下試驗皆保持良好狀態，顯示一定厚度的泡棉具有保護作用。

關鍵字

落下行為 ； 液晶顯示器模組 ； 彎曲試驗 ； 有限元素分析

並列摘要

The purpose of this study is to investigate the mechanical behavior of LCD module under bending and drop tests. The bending tests along the longitudinal, horizontal, right diagonal, left diagonal directions of a stand-alone LCD module are set up and performed to study the correlation of force & displacement and the cracking phenomena. Then, the crack behavior of cell phone is investigated during a 150-cm dropping test with LCD face-down. Besides, the influence & protection effect of sponge thickness on LCD module would be considered during drop test. In this case study, both bending test and finite element simulation came out with the same result that LCD module is relatively weak in longitudinal directions than other directions to withstand the bending force. The result from drop tests showed that the LCD module without sponge has 75 percent of cracking after dropping test; LCD module with 0.4&0.6 mm sponges has 25 percent of cracking after dropping test. Final, LCD module with 0.8 mm sponge has no cracking after 4 times of dropping test. That also means the 0.8 mm sponge could provide fine protection for LCD module during dropping in this case study.

並列關鍵字

Drop Behavior ； LCD module ； Bending Test ； Finite Element Analysis

參考文獻

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