- "Field-induced Microdomain Liquid-Crystal Display Modes", H. Ohno, H. Okada and H. Onnagawa, J. Appl. Phys. 93 (12) pp.9630-9633 (2003).
Electronic Material and Devices Engineering Laboratory, University of Toyama.
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For liquid crystal display (LCD) mode, various display modes are proposed and commercialized, such as, multi-domain vertical alignment (MVA), axial symmetric micro-cell (ASM), in-plane switching (IPS), optically compensated bend (OCB), vertical alignment (VA) with oblique electric field, optical compensated twisted nematic (TN). One of viewing angle improvement method is alignment division technology. In this method, wide viewing angle is obtained, where, direction of liquid crystal is divided into several domains.
In this time, electro-optical characteristics of field-induced microdomain (FIMD) LCD modes are investigated. One side of the substrate has radial electrodes and the other side has concentric electrodes. Large numbers of multidomain structures are induced in one pixel. The electric field gradually decreases from the center to the outer multidomains due to the radial electrodes. Although the liquid crystal molecules align in an oblique direction from the normal of the cell inner surface, the color shift of the output light was smaller than that of the birefringence modes. Using this display mode, wider viewing angle, controllable voltage vs transmittance curve, and good display using special shaped pixel structure are carried out.