LIGHT-EMITTING DEVICE, BACKLIGHT DEVICE, AND IMAGE DISPLAY APPARATUS

摘要

A light-emitting device includes: a first planar member having a plurality of light sources; a second planar member being parallel to the first planar member; and a reflecting member reflecting light beams from the respective light sources to the second planar member, the reflecting member being provided on an inner side of a polygon which is defined by the light sources as vertices thereof, wherein the reflecting member having a polygonal pyramidal shape with a bottom surface being parallel to the first planar member satisfies at least one of: a condition that a diffusion distance is from 0.8 to 1.3 when a length of each side of a polygon of the bottom surface is 1; and a condition that an angle between a side surface of the polygonal pyramid and the bottom surface is from 40 degree to 60 degree.

主权项

1. A light-emitting device comprising:
a first planar member in which a plurality of light sources are placed; a second planar member which is provided approximately in parallel to the first planar member and which is irradiated with light from the plurality of light sources; and a first reflecting member which is provided on an inner side of a polygon defined by the plurality of light sources of the first planar member as vertices thereof, and which reflects light beams from the respective light sources to the second planar member, wherein a shape of the first reflecting member satisfies at least one of: a first condition under which the shape is a polygonal pyramid, the bottom surface of which is approximately parallel to the first planar member, and a diffusion distance which is a distance between the first planar member and the second planar member is in a range of 0.8 and 1.3 when a length of each side of a polygon of the bottom surface of the polygonal pyramid is 1; and a second condition under which the shape is a polygonal pyramid, the bottom surface of which is approximately parallel to the first planar member, and an angle between a side surface of the polygonal pyramid and the bottom surface is in a range of 40 degree and 60 degree.