Parallel aligned chiral nematic liquid crystal display element

摘要

A liquid crystal display element comprising a liquid crystal composition having an optically active compound as at least one constituent and showing a cholesteric phase in a bulk state, wherein the liquid crystal composition is arranged between substrates, at least one of which is provided with a transparent electrode, so that long axes of individual liquid crystal molecules are in parallel to one another and are oriented in the same direction as the surfaces of the substrates, and the long axes of the molecules are uniformly aligned in parallel, vertically or inclined to the surfaces of the substrates, wherein the gap d ((my)m) between the substrates and the size p ((my)m) of the helical pitch shown by the cholesteric phase liquid crystal at room temperature when an electric field is not applied satisfy the following relationships: d/p>= 1.