Liquid crystal display cells and methods of switching same

Details Liquid crystal display cells and methods of switching same Liquid crystal display cells and methods of switching same

G - Physics

02

F

375/39, 345/8

G02F 1/133 (2006.01) G02F 1/139 (2006.01)

Patent

CA 1210481

-19- A NEMATIC LIQUID CRYSTAL STORAGE DISPLAY DEVICE Abstract A bistable nematic liquid crystal display cell is electrically switched between topologically equivalent, asymmetric horizontal states. Switching is initiated by application of a symmetry breaking field such as a DC electric field of a predetermined polarity. An AC electric potential is then applied across the cell to complete the switching cycle and maintain the state. The cell includes upper and lower parallel substrates, upper and lower topographically textured tilt alignment surfaces on the corresponding substrates, and nematic liquid crystal material between the substrates. In an active region of the cell, the tilt alignment surfaces form an equal reverse tilt boundary condition. In an isolation region surrounding the active region of the cell, the tilt alignment surfaces are formed to have a parallel tilt boundary condition.

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