Patent ID: 8421954
Filing Date: 2013-04-16
Classification: G02B

Abstract:
1. An auxiliary light source device for a reflective liquid crystal display device having a reflector, the auxiliary light source device comprising: a light source; a light directing member for directing incident light from the light source toward the reflector outwardly along an orthogonal direction, the light directing member including, an upper surface and a lower surface parallel to each other, the lower surface having a plurality of convex portions extending from the lower surface, each of the plurality of convex portions having a substantially planar surface which is substantially parallel to the lower surface and a side surface connecting the substantially planar surface and the lower surface, and a side surface angle between the side surface of the each convex portion and a line perpendicular to the substantially planar surface is less than 5°, wherein the plurality of convex portions have the same side surface angle with each other, wherein light reflected along an orthogonal direction to the liquid crystal display device is uniform, wherein a ratio of the height to width of the plurality of convex portions is substantially about 1 to 2, and wherein a size of the plurality of convex portions increases with increasing distance from the light source; and a sidewall reflector surrounding the light directing member, and extending lower than the substantially planar surface of the plurality convex portions.