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Abstract
The liquid crystal display device using guest-host interactions has. attracted interest recently because of displaying color and wide viewing angle. This paper describes dyes with high dichroic ratio, and proposes two new types of the guest-host cell being more useful than usual one. One of them is the cell with twisted molecular alignment and has sharper threshold voltage than the usual cell with homogeneous alignment. The other one with small pretilt from homeotropic alignment is made of a host nematic with negative dielectric anisotropy and is the positive type display device with high color contrast. The optimal pretilt angle of this cell is also clarified.