TFT-LCD TV面板畫質改良之熱變形量測研究

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姓名

詹志柏(Chih-po Chan) 查詢紙本館藏

畢業系所

機械工程學系在職專班

論文名稱

TFT-LCD TV面板畫質改良之熱變形量測研究
(Thermal deformation measurements on TFT-LCD TV panels for image quality)

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摘要(中)

TFT-LCD螢幕在電源驅動，點亮背光模組燈管，當持續一段時間後，因燈管釋放熱量，造成液晶面板翹曲變形，在螢幕上方角落產生色彩白化現象，影響影像品質。為探討此問題機制，本研究分三部份實驗來探討其發生原因，進而找出較佳解決方案，改善畫質不良現象。實驗使用熱電偶量測 TFT-LCD TV模組溫度，量測部份包含燈管電極端及背光模組空氣層溫度及液晶面板溫度等，藉以獲得各部位之溫度分佈。另使用XY直線運動平台，搭配電容式位移感測器，量測液晶面板熱變形位移，藉以量測面板變形趨勢及變形量。此外，運用應變規量測液晶面板表面應變量，以瞭解縱向及橫向應變之關係。
經由實驗瞭解色彩白化現象發生機制，並由實驗獲得數據，進一步探討設計改善方式。由溫度量測，瞭解面板上方為溫度較高，因此增加開孔散熱之設計；由位移計獲得之面板熱變形，得知面板上方角落之變形量最大，因此微增面板與前框之間隙量，以減少因變形而與前框壓迫干涉，兩種設計改善方式，均再以實驗驗證其效果。

摘要(英)

TFT-LCD deforms due to the heat released by lamp when powering on and lighting up the backlight of TFT-LCD monitor several minutes. Deformation results in the white phenomenon of color on the corners of screen, up-left and up-right, and worsens the image quality. In order to analysis the problem, this study provides three different experiments and tries to find the best solution for improving the defect. The first measure uses thermocouples to measure temperature at different parts, including lamps, air-gap in backlight module and surface on TFT-LCD. Then the temperature distribution in different areas could be shown. In order to know the general situation about TFT-LCD’s deformation, the second one uses X-Y stage with displacement sensor to get the displacement of heat deformation. The last one we apply strain gage to measure surface of TFT-LCD and understand the relationship between lateral strain and longitudinal strain. Thought experiment of the first one, we knew the reason why white phenomenon happens. Then we present another mechanical design to avoid it. We added holes on shell to cool down faster because in the second experiment we know the TFT-LCD’s upper side have the higher temperature. From the displacement sensor measurement, the deformation of panel is obtained, we knew the biggest displacement which happens at the corners of upper side. So it would be better to add some distances between TFT-LCD and frame to reduce interferences. Two modifications would be experimented to show the effect.

關鍵字(中)

★ TFT-LCD
★ 量測
★ 變形

關鍵字(英)

★ TFT-LCD
★ deformation
★ measurement

論文目次

中文摘要Ⅰ
Abstract Ⅱ
誌謝III
目錄 IV
圖目錄VI
表目錄VIII
第一章緒論 1
1.1 研究動機及目的 1
1.2 文獻回顧 2
1.3 研究範圍 3
1.4 論文內容 3
第二章整體實驗設備架構及量測方法 4
2.1 量測實驗設備 4
2.2 各實驗使用感測設備 4
2.2.1 溫度量測(A) 4
2.2.2 位移掃瞄量測(B) 4
2.2.3 應變量測(C) 5
2.3 量測儀器 5
2.3.1 熱電偶 5
2.3.2 電容示非接觸型位移計 7
2.3.3 應變規 8
2.3.3.1應變規感測原理 8
2.3.3.2溫度效應及其補償 9
2.3.3.3三線式導線溫度補償原理 9
2.4 量測實驗設備架構 11
2.4.1 溫度量測實驗 11
2.4.2 位移計量測實驗 12
2.5 實驗量測部位 12
2.6 量測方法 15
第三章實驗結果與討論 16
3.1 溫度量測 16
3.2 位移計之面板熱變形量測 19
第四章設計改善 26
4.1 前框隔墊增大設計 26
4.2 開散熱孔設計 28
第五章結論與未來展望 36
5.1 結論 36
5.2 未來展望 36
參考文獻 37

參考文獻

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指導教授

潘敏俊(Min-Chun PAN)

審核日期

2009-2-4

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