Cell with a double liquid crystal layer using the electrically controlled birefringence effect and process for producing a uniaxial medium with negative optical anisotropy usable in said cell

摘要: Cell with a double liquid crystal layer using the electrically controlled birefringence effect and process for producing negative optical anisotropy uniaxial material usable in said cell. The cell can comprise two crossed rectilinear polarizers, three glass plates provided transparent electrodes placed between layers and, plate polarizer, sheet of medium, whose extraordinary axis is perpendicular to plates. This be obtained by heating thermoplastic polymer up isotropic state, under uniform pressure on cooling eliminating pressure. designed such way that molecules respective tilt directions forming same angle homeotropy direction, when an exciting voltage applied electrodes, directions, viewed projection plate, also being opposite main observation plane. Application production television screens.