Field-of-view compensated polarization switch for short-throw 3D projection

摘要

Generally, this disclosure concerns the angle sensitivity of polarization switch elements and the resulting impact of the ray direction on performance. More specifically, apparatus and techniques for compensating the angular sensitivity of liquid crystal (LC) polarization switches are described that enhance the performance of polarization switches. For example, a polarization switch is disclosed that transforms linearly polarized light of an initial polarization orientation that includes a first and second liquid crystal cell with a compensator located between the LC cells. The compensator layer is operable to enhance the field of view through the polarization switch. Such compensation techniques are particularly useful for short-throw projection environments.

主权项

1. A polarization switch that transforms linearly polarized light of an initial polarization orientation, comprising:
a first liquid crystal cell having a first axis of orientation relative to the initial polarization orientation; a second liquid crystal cell having a second axis of orientation relative to the initial polarization orientation; and a first compensation layer located between the first liquid crystal cell and the second liquid crystal cell;
wherein, when the polarization switch is in operation, the first liquid crystal cell transforms the linearly polarized light to a first circularly polarized light in a first state and the second liquid crystal cell transforms the linearly polarized light to a second circularly polarized light in a second state different from the first state.