JPS5574517A - Liquid crystal display element - Google Patents

Abstract

PURPOSE: To eliminate the formation of edge domains and improve display quality by specifying the way of superposition of upper and lower electrodes according to the initial orientation inclination angle of the liquid crystal molecules on the electrode surfaces and the orientation treatment of the upper and lower electrodes.

CONSTITUTION: If in the element having the electrodes 3 of a lower substrate 1 and the electrodes 4 of an upper substrate 2 the initial orientation inclination angle of the liquid crystal molecules 11 on the electrode 3 surface is let α₀ and when an electric field is applied, the liquid crystal molecules 11 rise in the arrow direction of the electric line of force 10. At this time, orientation discontinuous portions occur at the edge part molecules 11a, 11b, thus edge domains appear. These are provented by making the lower electrodes larger than the upper electrodes when formula (I) is satisfied and making the upper electrodes larger than the lower electrodes when formula (II) is satisfied where the angle measured counterclockwise by taking an arbitrary point O on the display patterns, dropping a perpendicular OP on the periphery or extension line of the patterns with the combined vector of the orientation directions 7, 6 of the liquid crystal molecules on the upper and lower substrates 2, 1 as X-axis and using O as origin is let to be θ. In this way the display is made distinct.

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