Patent ID: 8646960
Filing Date: 2014-02-11
Classification: G02B,H04N

Abstract:
1. A backlight, comprising: a slatless light guide having opposed first and second major surfaces and at least a substantially planar first light injection surface; and at least a first light source assembly separated from the first light injection surface by an air gap, the first light source assembly comprising a first and second light source arranged along the first light injection surface to inject a first and second light beam, respectively, into the light guide through different portions of the first light injection surface, the first and second light beams being partially collimated, and the first and second light sources being adapted for independent operation, the first light source assembly further comprising at least one non-light emitting surface disposed proximate and substantially parallel to the first light injection surface, the at least one non-light emitting surface being adapted to substantially absorb light; wherein the first major surface comprises a plurality of first structures, the first structures being parallel to each other and to a first axis; and wherein the second major surface comprises a plurality of second structures, the second structures being parallel to each other and to a second axis different from the first axis, the second structures being adapted to enhance angular spreading along the first axis for light that passes out of the light guide through the second major surface, and to limit spatial spreading along the first axis for light that remains in the light guide by reflection from the second major surface.