Patent Number: 6,169,531

Title: Liquid-crystal control circuit display device with selection signal

Abstract: In display devices based on ferroelectric liquid-crystal material with deformable helix, ferroelectric liquid-crystal material with a twisted smectic structure, monostable ferroelectric liquid-crystal material, electroclinic smectic A liquid-crystal material and anti-ferroelectric liquid-crystal material, the memory effect, particularly in the case of video applications, is eliminated by presenting reset pulses in successive row selection times during a part of these times (for example in the case of matrix displays based on TFTs), so that the polarization within a cell is always reduced to zero and, after selection for the purpose of writing data, switches to the proper value.

Inventors: Verhulst; Antonius G. H. (Eindhoven, NL)

Assignee: U.S. Philips Corporation

International Classification: G09G 3/36 (20060101); G09G 003/36 ()

Expiration Date: 01/02/2018