Surface emitting device and liquid crystal display
To provide source images is increased to enhance the uniformity of luminance distribution. A surface emitting device includes: a diffusing sheet constituting a light exiting surface; a reflector disposed opposite to the diffusing sheet; light sources disposed between the diffusing sheet and the reflector; and a prism sheet (light-source-image division sheet) disposed between the diffusing sheet and the light sources. The prism sheet has linear protrusions on the front surface thereof, and a flat portion parallel to the sheet surface between the adjacent linear protrusions. This generates light-source images through the flat portions in addition to the divided light-source images through the linear protrusions 16 a to increase the number of light-source images, thereby improving luminance uniformity.
1. A surface emitting device comprising:
a diffusing sheet constituting a light exiting surface;
a reflector disposed opposite to the diffusing sheet;
a plurality of light sources disposed between the diffusing sheet and the reflector; and
a light-source-image division sheet disposed between the diffusing sheet and the light sources,
wherein the light-source-image division sheet has a plurality of linear protrusions on at least one of the front and back surfaces thereof wherein the linear protrusions include a flat portion on top thereof; and
wherein the light-source-images division sheet has a flat portion parallel to the sheet surface between the adjacent protrusions.
2. The surface emitting device according to claim 1 , wherein
the protrusion is a polygonal prism or a polygonal pyramid having a plurality of surfaces; and
the surfaces of the protrusions and the surface of the flat portion are equal in length in the protrusion arranging direction.
3. The surface emitting device according to claim 1 , wherein the light source is a line light source.
4. The surface emitting device according to claim 1 , wherein the light source is a point light source.
5. A liquid crystal display comprising:
a liquid-crystal display panel; and
a surface emitting device that illuminates the liquid-crystal display panel from the back,
wherein the surface emitting device includes: a diffusing sheet constituting a light exiting surface; a reflector disposed opposite to the diffusing sheet; a plurality of light sources disposed between the diffusing sheet and the reflector; and a light-source-image division sheet disposed between the diffusing sheet and the light sources,
and wherein the light-source-image division sheet has a plurality of linear protrusions on at least one of the front and back surfaces thereof wherein the linear protrusions include a flat portion on top thereof; and
the light-source-image division sheet has a flat portion parallel to the sheet surface between the adjacent protrusions.