Patent ID: 9194994
Filing Date: 2015-11-24
Classification: G02B

Abstract:
1. A liquid crystal display device comprising: a light source; a light guide plate including a front surface, a back surface on the side opposite to the front surface, and an edge surface connecting the front surface with the back surface, the light guide plate being arranged such that the edge surface faces the light source, the light guide plate internally reflecting light incident from the edge surface and causing surface emission from the front surface; a liquid crystal display panel arranged so as to face the front surface of the light guide plate; and a reflective sheet arranged so as to face the back surface of the light guide plate, wherein the back surface includes a first portion and a second portion, the second portion having a surface located at a position recessed relatively from a surface of the first portion, the first portion is a plurality of ridge portions whose axis lines each extend along a traveling direction of light and adjacent ones of which are arranged in parallel in a direction orthogonal to the traveling direction of the light, the second portion is a flat portion between the ridge portions adjacent to each other, the surface of the first portion is a rough surface, the surface of the second portion is a smooth surface, the reflective sheet is in contact with the first portion but avoids contact with the second portion, and the front surface of the light guide plate includes a transverse convex portion extending in a direction along the direction orthogonal to the traveling direction of the light.