Patent ID: 8690407
Filing Date: 2014-04-08
Classification: G02B,G02F

Abstract:
1. An illumination unit, comprising a light emitting element and a tabular light guide plate including a plurality of regions having a light emitting surface for emitting light from the light emitting element as planar light, wherein a recessed portion is formed in an opposite surface of the light emitting surface of the light guide plate and the light emitting element is provided in the recessed portion so that an optical axis of the light emitting element becomes parallel to the light emitting surface of the light guide plate; wherein a plurality of the light emitting elements are arranged along a longer direction of the recessed portion, wherein a dimming pattern is provided on the light emitting surface of the light guide plate at a location corresponding to each of the plurality of light emitting elements; and wherein a shape or a size of the dimming pattern is varied with a location on the light emitting surface of the light guide plate.