Yellow Dyes for Liquid Crystal Displays
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
In guest-host display systems in which a dye is dissolved in a liquid crystalline matrix, the dye which is used has a number of requirements which must be met in order that it will be useful in a practical manner. Among these requirements are adequate solubility in the liquid crystal host, chemical and photochemical stability, a high order parameter (which includes the angle that the transition dipole makes with the long axis of the molecule as well as the geometrical requirements of high aspect ratio), and a strong absorption in the visible portion of the spectrum. In an ideal case, we would like to have such a dye in which the absorption was broad enough to cover the whole visible spectrum, i.e.