Patent ID: 11947221
Assignee: FUJIFILM CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A liquid crystal display element comprising:
a liquid crystal cell provided with a liquid crystal layer in which an optical axis of liquid crystal molecules is inclined; and
a phase difference compensation element for compensating for a phase difference generated in the liquid crystal layer,
wherein the phase difference compensation element includes a substrate and a phase difference film having at least one oblique vapor deposition layer on at least one substrate surface of the substrate,
the oblique vapor deposition layer exhibits refractivity anisotropy represented by a biaxial refractive index ellipsoid as an optical characteristic by having a columnar structure body inclined with respect to a normal line of the substrate surface,
in three principal refractive indices in the refractive index ellipsoid, in a case where a principal refractive index of the columnar structure body in a longitudinal direction is defined as n1, and in an ellipse perpendicular to the longitudinal direction of the columnar structure body, in a case where a principal refractive index in a major-axis direction is defined as n2 and a principal refractive index in a minor-axis direction is defined as n3, n2 is a largest among the three principal refractive indices,
the major-axis direction is a direction in a plane of the oblique vapor deposition layer, which is perpendicular to an axis obtained by projecting the longitudinal direction of the columnar structure body onto a surface of the oblique vapor deposition layer,
in a case where the oblique vapor deposition layer is one layer, a slow axis of the phase difference film is parallel to the major-axis direction,
in a case where the oblique vapor deposition layer is a plurality of layers, the slow axis of the phase difference film has a magnitude of n2 which is a maximum principal refractive index in each oblique vapor deposition layer,
in a case where a vector along the major-axis direction is a directional vector, the slow axis of the phase difference film is parallel to a combined vector obtained by combining the directional vectors of the oblique vapor deposition layers, and
the liquid crystal display element is disposed in an aspect in which an intersecting angle between a slow-axis direction of the phase difference film and a fast-axis direction of the liquid crystal layer, which is a direction perpendicular to a direction in which the inclined optical axis of the liquid crystal molecules is projected onto the substrate surface, is −25° to +25°.