水平配向為主的單間隙半穿透半反射液晶顯示器

Single Cell Gap Transflective TFT-LCDs based on Homogeneous LC Alignment

羅元甫(Yuan-Fu Luo)

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(2006年)

https://doi.org/10.6342/NTU.2006.00599

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，所有的設計都以水平配向的液晶層為基礎，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-光穿透率曲線的匹配，改善舊有文獻曲線不甚匹配的缺點，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做一區分。一開始我們以雙模態單間隙半穿反顯示器的方向出發，先以PA-FFS mode TR-LCD作為研究主題，藉由設計的結構及參數的分析調校來達到電壓-光穿透率曲線的匹配；然後我們更進一步去嘗試改良PA-FFS mode TR-LCD的結構，使設計的結構在製程上的可行性提高。而我們也試著在穿透及反射液晶層上使用同一模態的液晶設計，稱為Dual-PA mode TR-LCD，此設計在結構上更加簡化，而且也有不錯的電壓-光穿透率曲線匹配。
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反液晶顯示器。在模擬上，也達到不錯的電壓-光穿透率曲線表現。

關鍵字

半穿透半反射 ； 液晶顯示器 ； 水平配向 ； 中小尺寸液晶顯示器

並列摘要

In this thesis, we propose and demonstrate the simulations results obtained for three new designs of single cell gap transflective TFT-LCDs (TR-LCDs) that are based on homogeneously aligned (or Parallel Aligned, PA) liquid crystal (LC) layers. Our simulation results are obtained through the use of a professional and reliable 2D-LCD simulation software “2DimMos” purchased from Germany.
Due to the double-path experienced by the reflected light, a single cell gap TR-LCD usually has the problem such that its voltage-dependent transmittance and reflectance curves (V-T & V-R) 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 three 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 three designs are named as follows: i) Bottom-mode PA-FFS TR-LCD, ii) Top-mode PA-FFS TR-LCD, iii) Dual PA mode TR-LCD. The simulation results obtained so far demonstrate that these three 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. Simpler device structure and fabrication process are possible by further developments and optimizations.

並列關鍵字

Single cell gap ； transflective LCD ； homogeneous alignment ； PA mode ； FFS mode ； Gamma curve ； small size

參考文獻

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