Measuring method of liquid crystal pretilt angle and measuring equipment of liquid crystal pretilt angle
AssigneeNEC Corporation
InventorIchiro Hirosawa
Life of this patent
Estimating the term…
Abstract
By setting the linearly polarized light with normal incidence on the liquid crystal sample 3 and rotating the liquid crystal sample 3 on a rotation stage 7 within plane, the dependencies of the amplitude ratio as well as the optical retardation of the transmitted light on the azimuth of the liquid crystal sample, with respect to the polarization direction of the incident light, are measured. From these measured results, a liquid crystal pretilt angle is determined.
Claims4
A method of measuring a liquid crystal pretilt angle which determines a liquid crystal pretilt angle by setting linearly polarized light incident on a liquid crystal sample and measuring the polarization of transmitted light thereof;
- wherein:
- having passed through a polarizer, said linearly polarized light is normal to the surface of the liquid crystal sample in incidence;
- and
- by rotating said polarizer within plane, the dependencies of the amplitude ratio of said transmitted light as well as the optical retardation of said transmitted light on the azimuth of the liquid crystal sample with respect to the polarization direction of the incident light are measured and thereby the pretilt angle of said liquid crystal sample is determined.
An equipment for measuring a liquid crystal pretilt angle;
- comprising:
- a light source;
- a polarizer which polarizes emitted light from said light source;
- a mechanism to rotate said polarizer within plane;
- a holder which is placed behind said polarizer and holds a liquid crystal sample as an object of the measurement;
- a means for measuring, with the light having passed through said liquid crystal sample, the amplitude ratio of said transmitted light as well as the optical retardation of said transmitted light;
- and
- a means for determining a liquid crystal pretilt angle from said measured polarization.
Dependencies are inferred from the claim text.