Optical path control member and driving method thereof

Abstract

A method of driving an optical path control member includes a first step of turning on a power of the optical path control member in an initial mode; a second step of setting an application time of a first voltage applied to the optical path control member; and a third step of setting an application time of a second voltage applied to the optical path control member, wherein the second step includes: applying the first voltage of |a|V for xseconds; determining whether a set first light transmittance is satisfied; and if the first light transmittance is not satisfied, applying the first voltage of |a|V for xseconds; wherein the determining whether the first light transmittance is satisfied includes: if a light transmittance is 60% or more in a region where an user's field of view exceeds 45°, determining that the first light transmittance is satisfied, and if a light transmittance is less than 60% in the region where the user's field of view exceeds 45°, determining that the first light transmittance is not satisfied, wherein the third step includes: applying the second voltage of |b|V for yseconds; determining whether a set second light transmittance is satisfied; and if the second light transmittance is not satisfied, applying the second voltage of |b|V for yseconds, wherein the determining whether the second light transmittance is satisfied includes: If a light transmittance is less than 10% in a region where the user's field of view is less than 45°, determining that the second light transmittance is satisfied, and if a light transmittance is 10% or more in the region where the user's field of view exceeds 45°, determining that the second light transmittance is not satisfied.