Lim Young Jin, Kim Jin Ho, Her Jung Hwa, Bhattacharyya Surjya Sarathi, Park Kyoung Ho, Lee Joun Ho, Kim Byeong Koo, Lee Seung Hee
Polymer BIN Fusion Research Center, Department of Polymer-Nano Science and Technology, Chonbuk National University, Chonju, Chonbuk 561-756, Korea.
Opt Express. 2010 Mar 29;18(7):6824-30. doi: 10.1364/OE.18.006824.
All conventional viewing angle switchable liquid crystal displays with pixel division have drawback in light efficiency because the sub-pixel that controls viewing angle does not transmit the incident light at normal direction. In this paper, we propose new viewing angle controllable homogeneously aligned liquid crystal display in which the pixel is composed of red, green, blue, and white pixels. The colored pixels are driven by fringe-field switching and the white pixel is driven by complex field. In wide-viewing angle mode, the liquid crystal (LC) directors in all pixels rotate in plane, contributing to high transmittance. In narrow-viewing angle mode, the LC directors in color pixels rotate in plane for light transmission while the LC directors in white pixel can rotate or tilt upward by simultaneous fringe and vertical electric field. The high tilted LC directors generate light leakage in oblique directions which can be utilized for viewing angle control and also transmission at normal direction for image expression. The proposed device overcomes the long standing problem of transmittance sacrifice in the conventional devices.
所有具有像素分割的传统视角可切换液晶显示器在光效率方面都存在缺陷，因为控制视角的子像素在法线方向上不传输入射光。在本文中，我们提出了一种新型视角可控的均匀排列液晶显示器，其中像素由红色、绿色、蓝色和白色像素组成。彩色像素由边缘场开关驱动，白色像素由复合场驱动。在宽视角模式下，所有像素中的液晶（LC）指向矢在平面内旋转，有助于实现高透射率。在窄视角模式下，彩色像素中的LC指向矢在平面内旋转以实现光传输，而白色像素中的LC指向矢可以通过同时施加边缘电场和垂直电场而旋转或向上倾斜。高倾斜的LC指向矢在倾斜方向上产生光泄漏，这可用于视角控制，并且在法线方向上也可用于图像显示的透射。所提出的器件克服了传统器件中长期存在的透射率牺牲问题。
