Patent ID: 8992062
Filing Date: 2015-03-31
Classification: G02B

Abstract:
1. A display device, comprising: a light source; a light guide plate comprising a front surface, a rear surface on a side opposite to the front surface, and an edge surface connecting the front surface and the rear surface to each other, the light guide plate being arranged so that the edge surface is opposed to the light source, the light guide plate being configured to internally reflect light entering from the edge surface to cause planar light emission from the front surface; a light shutter type display panel, which is arranged so as to be opposed to the front surface of the light guide plate, and in which passing and blocking of the light exiting from the front surface of the light guide plate is controlled to display an image; and a reflective sheet arranged so as to be opposed to the rear surface of the light guide plate, wherein: the front surface of the light guide plate has irregularities formed thereon; the irregularities of the front surface of the light guide plate are formed to have a shape of a combination of a plurality of first convex portions and a plurality of second convex portions, each of the plurality of first convex portions comprising a first ridge line which continuously extends along a first direction corresponding to a traveling direction of the light, each of the plurality of second convex portions comprising a second ridge line which continuously extends along a second direction intersecting the first direction; a pitch of the first convex portions is substantially constant; a pitch of the second convex portions is substantially constant; and the second convex portions vary in height with respect to a height of the first convex portions so that some of the second convex portions have a first height and others of the second convex portions have a different second height with respect to the height of the first convex portions so as to enable adjustment of a light distribution of light exiting the front surface of the light guide plate.