| abstract |
A row-by-row matrix-addressed display comprises a plurality of liquid crystal cells. Each cell includes a cholesteric-type liquid, with a pleochroic dye dissolved in the liquid crystal material. In operation, each cell has applied thereto either an energizing voltage or an above-zero holding voltage. When energized, a cell is transparent. In response to the holding voltage a cell is either transparent or colored and turbid depending, respectively, on whether or not an energizing voltage was last applied thereto. The clear state at the holding voltage is metastable and eventually decays to the colored turbid condition. |