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Abstract
Improved wide viewing-angle polarizers are proposed thatemploy symmetrically 留学生论文代写identical compensator designshaving relaxed manufacturing tolerances relative to theirorientation to the transmission axis of the polarizer. Thesedesigns can be realized in numerous ways and cancomprise two A-plates, one A-plate and one C-plate, or onebiaxial plate.

1.Introduction
The contrast provided by LCD panels can be improved in variousways, including improvements in the compensator design,polarization recycling [1], and LC composition and alignment.Viewing angle characteristics of LCDs have been dramaticallyenhanced by various kinds of polarization compensators that aredesigned to minimize viewing angle dependencies of the liquidcrystallayer. However, unsatisfying viewing angle dependence ofpolarizers becomes a limiting factor, especially for everincreasingly high-contrast requirements for LCD monitors andtelevisions. As a result, various improved wide-viewing polarizershave been proposed [2-4]. Unfortunately, the majority of thesedesigns for compensated wide viewing-angle polarizers imposetight tolerances on the alignment of the compensator relative tothe polarizer. These shortcomings have been addressed by analternate design approach [5] that enables a compensator for awide-viewing polarizer with relaxed alignment tolerances, whichis particularly suitable for use in transmissive panels.

2. Results
2.1 Design Concepts
In the design for the compensators, we take a pair of identicalpolarizer packages into consideration. Each polarizer package(Polarizer package A or B), as shown in Figure 1, includes anabsorbing layer (Absorbing layer A or B, sometimes also referredto as a “polarizer”), which is typically a stretched polyvinylalcohol (PVA) doped with a dichroic dye, and one or twocompensators (together referred as Compensator A orCompensator B), being either two A-plates, one A-plate and oneC-plate, one C-plate and one A-plate, or one biaxial plate—in thatorder—counted from the absorbing layer. An LC cell (not shown)is nominally sandwiched between the two polarizer packages.Note that Compensator A and Compensator B are identical.Consequently, Polarizer package A and Polarizer package B areidentical, except for orientation. The model for the absorbinglayer is similar to a Nitto Denko NPF-G1220DU high efficiencypolarizer [6]. The criterion used for the compensator design is toreduce the light leakage through a pair of identical polarizerpackages below 0.1% (reduced by a factor of more than 10compared to 1.4%, which is the case without thecompensators) for all azimuthal angles, and possibly for all wavelengths of interest, when viewed from a polar angle of 60°or lower. The designs presented here apply to all other sheet polarizers, including both O-type [6] and E-type polarizers, independent of the details of the polarizers.

5. References
[1] X.-D. Mi, D. Kessler, L. Tutt, L. Weller-Brophy, “LowFill-Factor Wire Grid Polarizers for LCDBacklighting”, SID 05 Digest, pp. 1004-1007 (2005).
[2] J. Chen, K.-H. Kim, J.-J. Jyu, J.H. Souk, J. Kelly, P.Bos, “Optimum Film Compensation Modes for TN andVA LCDs”, SID 98 Digest, pp. 315-318 (1998).
[3] T. Ishinabe, T. Miyashita, T. Uchida, “Novel WideViewing Angle Polarizer with High Achromaticity”,SID 2000 Digest, pp. 1094-1097 (2000)
[4] T. Ishinabe, T. Miyashita, T. Uchida, “A 本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。