Display apparatus having collimated illumination

摘要

A display apparatus ( 30 ) has an LC device ( 14 ) exhibiting its maximum contrast with incident light at an oblique angle phi from normal, wherein oblique angle phi is greater than about +/-10 degrees from normal. A backlight unit ( 32 ) provides substantially collimated illumination with a central ray at an incident angle theta₂ with respect to the LC device ( 14 ), wherein incident angle theta₂ within about +/-5 degrees of oblique angle phi. The full-width half-maximum intensity of the illumination is within about +/-10 degrees of the central ray at incident angle theta₂.