Polymer-stabilized homeotropically aligned (PSHA) LCD

Chung-Kuang Wei; Yong-Hong Lu; Chen-Lung Kuo; Hsiao-Ling Huang; Chung-Yuan Liu; Hong-Da Liu; Wei-Chih Chang; Chia-Ming Cheng; Dan-Ching Yan

doi:10.1117/12.311055

17 June 1998 Polymer-stabilized homeotropically aligned (PSHA) LCD

Chung-Kuang Wei, Yong-Hong Lu, Chen-Lung Kuo, Hsiao-Ling Huang, Chung-Yuan Liu, Hong-Da Liu, Wei-Chih Chang, Chia-Ming Cheng, Dan-Ching Yan

Author Affiliations +

Proceedings Volume 3421, Display Technologies II; (1998) https://doi.org/10.1117/12.311055
Event: Asia Pacific Symposium on Optoelectronics '98, 1998, Taipei, Taiwan

Abstract

In this paper, we develop a homeotropically aligned liquid crystal display (LCD) by using gibbous square lattices to make symmetric pretilt of liquid crystals around the pixel. The symmetric pretilt boundary conditions of liquid crystal make the rubbing process no longer needed. Nevertheless, the response of the liquid crystal with negative dielectric anisotropy is too slow when a high voltage level is applied on the display. Therefore, we mix liquid crystal with small amount of monomer. THe weight percentage of monomer is less than 5 percent. After filling the liquid crystal mixture into the display, UV light cures the monomer when an applied voltage induces a symmetric director field. The polymer networks stabilize the director filed. In other words, the directors can reorient definitely in one way when the voltage is applied on or switched off. Experimental data have exhibited that this display to show moving pictures. Tuning the retardation value of compensator A- and C-plate, we make the display's viewing angle with contrast ratio greater than 10 be larger than +/- 70 degrees in all directions of view. The viewing angle without gray-scale inversion is larger than 70 degrees in all azimuthal angles. Furthermore, the color performance is uniform when one measures form all azimuthal angles. The excellent properties of wide viewing angle and fast response promise PSHA LCD applicable in high-end displays.

Citation Download Citation

Chung-Kuang Wei, Yong-Hong Lu, Chen-Lung Kuo, Hsiao-Ling Huang, Chung-Yuan Liu, Hong-Da Liu, Wei-Chih Chang, Chia-Ming Cheng, and Dan-Ching Yan "Polymer-stabilized homeotropically aligned (PSHA) LCD", Proc. SPIE 3421, Display Technologies II, (17 June 1998); https://doi.org/10.1117/12.311055

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