A hybrid liquid-crystal display with a small number of interconnections

A numerical display cell (nine digits of seven segments) with nematic liquid crystals can be driven in a dynamic or a static mode. The static mode combines a flicker-free display with optimum contrast, but it has the drawback of a large number of interconnections (63). This paper describes a method to reduce this number to only four: a 63-b buffer memory in the form of an I²L shift register is attached directly to the glass plate carrying the electrode pattern. The required transparent electrode patterns provided with metallized contacts are prepared by means of thin-film techniques.