ApplicationNo. 05/554987 filed on 03/03/1975
US Classes:349/33, Electrical excitation of liquid crystal (i.e., particular voltage pulses, AC vs. DC, threshold voltages, etc.)345/87, Liquid crystal display elements (LCD)359/900METHODS
ExaminersPrimary: Corbin, John K.
Assistant: Hille, Rolf
Attorney, Agent or Firm
Foreign Application Priority Data1972-08-29 FR
AbstractThe invention relates to a method of controlling an optical characteristic of a material and it is concerned also with devices and image-forming means for carrying out the method.The method of control is particularly advantageous in devices comprising a plurality of points distributed in the form of a matrix. The optical characteristic K of the material is controlled by an energization having a magnitude G for a duration t, the values G and t being so selected as a function of the time response K (G, t) of the characteristic K at an energization stage of magnitude G that K (GO, tO) is equal to KO.