Collimated scanning backlight device

Abstract

The invention relates to a scanning backlight device, based on dynamic light extraction, the device comprising a light guide structure (24), a light source for emitting light, arranged to be directed into said light guide structure, the light guide structure (24) being provided with an addressable out-coupling member, comprising two or more defined areas, each providing switchable out-coupling of light from said light guide structure (24). The scanning backlight device is characterised in that at least one micro-optical redirection member (23), arranged in proximity with said light guide structure (24), being arranged to redirect light emitted from said light guide structure (23) in an essentially normal direction of said light guide structure.

Dependencies are inferred from the claim text.