蔡永傑臺灣大學：光電工程學研究所羅元甫Luo, Yuan-FuYuan-FuLuo2007-11-252018-07-052007-11-252018-07-052006http://ntur.lib.ntu.edu.tw//handle/246246/50700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。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.第一章 導論 ..................................................... 1 1.1 研究背景與動機 ............................................ 1 1.2 半穿半反液晶顯示器 ( Transflective LCD ) 簡介 ............... 3 1.2.1 Double Cell Gap TR-LCD (雙間隙半穿反液晶顯示器) ...... 3 1.2.2 Single Cell Gap TR-LCD (單間隙半穿反液晶顯示器) ....... 7 1.3 雙模態半穿半反液晶顯示器 ( Two-mode TR-LCD ) 簡介 ..........9 1.4 模擬軟體 2DIMMOS 簡介 ...................................10 1.5 論文架構 ..................................................14 第二章 PA-FFS mode TR-LCD design (1) -- Bottom mode的模擬 (需要patterned retarder) ..................................... 15 2.1 章節概述 ...................................................15 2.2 穿透部分的理論分析 .........................................17 2.3 反射部分的理論分析 .........................................19 2.4 PA-FFS mode 的電極配置 .................................... 22 2.4.1 穿透部分 (PA mode) ......................................22 2.4.2 反射部分 (FFS mode) .................................... 25 2.5 各種參數對設計的影響 .......................................27 2.5.1 液晶的Cell Gap ..........................................28 2.5.2 液晶的Rubbing Angle .....................................30 2.5.3 液晶的Pretilt Angle .......................................32 2.5.4 穿透部分的電極寬度及間隙寬度 ...........................34 2.5.5 反射部分的電極寬度及間隙寬度 ...........................37 2.6 補償膜 –a plate 的應用 .......................................39 2.7 Wide-band quarter wave film的應用及分析 ...................... 42 2.8 PA-FFS mode TR-LCD 各層的角度配置及最佳化................. 44 2.9 章節總結 .................................................. 46 第三章 PA-FFS mode TR-LCD design (2) -- Top mode的模擬 (不需要patterned retarder) ................................... 47 3.1 章節概述................................................... 47 3.2 穿透及反射部分的作用原理 .................................. 49 3.3 Top λ/4 film PA-FFS mode 的電極及液晶rubbing方向配置 ........ 53 3.4 各種參數對設計的影響 ...................................... 59 3.4.1 液晶的Cell Gap及Pretilt Angle ............................ 59 3.4.2 液晶的Rubbing Angle .................................... 62 3.4.3 穿透和反射部分的電極寬度及間隙寬度 .................... 62 3.4.4 λ/4 film的放置角度 ..................................... 65 3. 4. 5 Dielectric Layer的影響 ................................... 65 3.5 Top λ/4 film PA-FFS mode TR-LCD 各層的角度配置及最佳化 ...... 68 3.6 章節總結 .................................................. 70 第四章 Dual PA mode TR-LCD design的模擬 .......................... 71 4.1 章節概述 .................................................. 71 4.2 穿透及反射部分的作用原理及電極配置 ........................ 73 4.3 各種參數對設計的影響 ...................................... 73 4.3.1 液晶的Cell Gap ......................................... 74 4.3.2 液晶的Pretilt Angle ...................................... 76 4.3.3 反射部分的電極寬度及間隙寬度 .......................... 77 4.3.4 反射部分絕緣體的dielectric constant影響 ................... 80 4.4 Dual PA mode TR-LCD 各層的角度配置及參數最佳化 ............ 81 4.5 章節總結 .................................................. 83 第五章 結論 ..................................................... 84 參考文獻 ........................................................ 863565808 bytesapplication/pdfen-US半穿透半反射液晶顯示器水平配向中小尺寸液晶顯示器Single cell gaptransflective LCDhomogeneous alignmentPA modeFFS modeGamma curvesmall sizethesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/50700/1/ntu-95-R93941056-1.pdf