Nematic Liquid Crystals: Applications, Section 3.2

Abstract

Matrix Address [ 1 -201The simplest way to overcome the scanning limitations encountered in passive matrix liquid crystal display panels is to provide one or more nonlinear circuit elements at the intersection of the gate and data electrodes, thus producing sharper threshold characteristics for each pixel. Presently, diodes and intrinsic nonlinear devices are used for these nonlinear circuit elements.In the two-branch configuration of Fig. 2, the liquid crystal pixel is charged when the diode is forward biased during the select period. Leakage from the pixel through the diode during the nonselected period is prevented by keeping both diodes reverse biased. One disadvantage of this configuration is that areas of the gate electrode buses are large on the substrate, and as a consequence, the pixel aperture ratio decreases greatly as compared with other diode addressing configurations.