使用PVA及OCB模式設計單間隙半穿透半反射式液晶顯示器

Single Cell Gap Transflective TFT-LCDs Design based on PVA and OCB Modes

李孟霖(Meng-Lin Lee)

指導教授 ： 蔡永傑

國立臺灣大學/電機資訊學院/光電工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.01239

摘要

本論文以模擬的方式嘗試設計出單間隙的半穿透半反射液晶顯示器，所有的設計都以在同一鉛直平面上驅動液晶分子為基礎，以不同於以往文獻的方式來達到在穿透及反射部分的電壓-光穿透率曲線的搭配，設計出新式的半穿透半反射式液晶顯示器，並期望進一步使結構簡單化。
論文的架構以研究的時間點和改善的過程來作區分。一開始我們繼承上一屆學長的題目，以PVA為研究主題，藉由設計的結構及參數的分析調校來達到電壓-光穿透率曲線的搭配；接著我們進入下一個主題OCB，我們從模擬結果中證實OCB許多優秀的特性，並藉由新的模擬軟體DIMOS，讓我們了解了分子驅動時的各個現象，最後將調整各項參數，使OCB成功的使用於半穿透半反射式液晶顯示器當中。
大致上來說，我們已經以不同於以往的方式設計出單間隙半穿透半反射液晶顯示器。在模擬上，也達到不錯的電壓-光穿透率曲線表現。

關鍵字

液晶,顯示器,穿透,反射

並列摘要

In this thesis, we propose and demonstrate the simulation results obtained for two new designs of single cell gap transflective TFT-LCDs (TR-LCDs) that are based on driving liquid crystal molecular on the same vertical plane. Our simulation results are obtained through the use of professional and reliable LCD simulation software “2DIMMOS” and “DIMOS” purchased from Germany.
Due to the double-path experienced by reflected light, a single cell gap TR-LCD usually has the problem such that its voltage dependent transmittance and reflectance curves (V-T & R-T) do not match each other very well, which often leads to very poor optical efficiency. This problem is, in general, overcome by the use of a rather complicated double cell gap design. In our studies, we propose and explore the potential possibility of two new designs of single cell gap TR-LCD such that they can achieve much better matched V-T and V-R curves and hence higher optical efficiency. These two designs are named as follows: i) PVA mode TR-LCD, ii) OCB mode TR-LCD. The simulation result obtained so far demonstrates that these designs can indeed, in principle, achieve much better matched Electro-Optic curves for both transmitted and reflected lights and hence result in improved optical efficiency. Simple device structure and fabrication process are possible by further development and optimizations.

並列關鍵字

pva,ocb,transflective,lcd,

參考文獻

[2] Shin-Tson Wu, College of Optics & Photonics University of Central Florida, “Reflective and Transflective TFT-LCDs”, OSE 6938P Lecture 9

[3] Okamoto et al, USP 6, 281, 952(2001)；Baek et al, IDW’00, p.410

[4] Liu et al, IDMC’03, p.215

[9] Kenji Nakao, Daiichi Suzuki, Tetsuya Kojima, Midori Tsukane, Hirofumi Wakemoto, “High-speed Bend Transition Method using Electrical Twist Field in OCB Mode TFT-LCDs”, SID’04 DIGEST p.1416~p.1419

[10] Chien-Lin Pan, Shen-Jiang Jeng, Chih-Liang Wu, Peter Hsu, “A 32-in. High-Contrast-Ratio OCB (Optical Compensation Bend) LCD TV”, SID’06 DIGEST p.1344~p.1345