Abstract: A liquid crystal display device which includes a pair of substrates; a liquid crystal layer sandwiched between the pair of substrates; and an electrode for applying a voltage to the liquid crystal layer is disclosed. The liquid crystal layers includes liquid crystal molecules, and is divided into a plurality of regions having different twist angles from one another.

Abstract: The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160.degree.-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.

Abstract: According to the present invention, a liquid crystal electro-optic device is provided. The liquid crystal electro-optic device includes a pair of insulating substrates disposed to face each other; a liquid crystal layer sandwiched between the insulating substrates; and a pair of alignment films respectively formed on the insulating substrates to be in contact with the liquid crystal layer. The orientations of liquid crystal molecules in the liquid crystal layer, which are in contact with the pair of alignment films, are aligned in a direction substantially perpendicular to the pair of insulating substrates, and the liquid crystal layer has a twist pitch of approximately quadruple the thickness of the liquid crystal layer.

Abstract: A tunable wavelength filter is independent of the polarization. The filter includes first and second liquid crystal layers. Each liquid crystal layer includes two opposing glass substrates on which transparent electrodes, dielectric mirrors and alignment layers are coated in this order, respectively, and a liquid crystal interposed between the opposing alignment layers. In the first liquid crystal layer, the molecule alignment of the liquid crystal is twisted by n.pi./2 radian to one twisting direction where n is a positive uneven number. In the second liquid crystal layer, the molecule alignment of the liquid crystal is twisted by -n.pi./2 radian to the twisting direction. The first and second crystal layers are laid to overlap each other so that an axis of liquid crystal molecules on the emission side of the first liquid layer is perpendicular to an axis of liquid crystal molecules on the incidence side of the second liquid crystal layer.

Abstract: It is an object of the invention to improve the viewing angle properties of a liquid crystal display device by controlling the state of orientation of liquid crystal molecules. The liquid crystal display device is constructed with an liquid crystal display element disposed between a pair of polarizing plates, and with phase difference plates disposed between each polarizing plate and the liquid crystal display element. The phase difference plates are selected so that nx.gtoreq.nz>ny is satisfied and the Nz value is in the range of 0.ltoreq.Nz.ltoreq.0.5. The liquid crystal display element is constructed by placing a liquid crystal layer between substrate members prepared by forming transparent electrodes and orientation films in the pair of light transmitting plates, and the liquid crystal layer sandwiched between the transparent electrodes is used as picture elements.