Planar light source device and liquid crystal display device
View Patent ↗A planar light source device includes a cold cathode fluorescent tube, a light guide opposed to the light source to emit light which is received from the light source, a frame which supports the light source and the light guide and has a projection which positions the light source and the light guide, and an optical sheet which provides an optical property for light radiated from the light source and has a regulation section that regulates contact between the light guide and the projection of the frame, the regulation section being located between the light guide and the projection.
1. A planar light source device comprising:
a light source;
a light guide opposed to the light source to guide light which is received from the light source;
a frame which supports the light source and the light guide, and has a projection which positions the light source and the light guide; and
an optical sheet which provides an optical property for light radiated from the light source, and has a regulation section that regulates contact between the light guide and the projection of the frame, the regulation section being located between the light guide and the projection.
wherein the light guide has a first main surface from which light is to be emitted, a second main surface that is a back side of the first main surface and is opposed to the frame, and a side surface that extends between the first main surface and the second main surface and is opposed to the projection, and
the optical sheet is opposed to one of the first main surface and the second main surface, and the regulation section has a tongue that extends from the optical sheet and is folded along the side surface of the light guide.
2. The planar light source device according to claim 1 , wherein the light guide has a light incidence surface that receives light from the light source, and the first main surface from which light received from the light incidence surface is to be emitted, and
the optical sheet is arranged on the first main surface of the light guide, and the tongue is provided at the optical sheet.
3. The planar light source device according to claim 1 , wherein the light guide has a light incidence surface that receives light from the light source, and the first main surface from which light received from the light incidence surface is to be emitted, and
the optical sheet is arranged between the frame and the second main surface of the light guide, and the tongue is provided at the optical sheet.
4. A planar light source device comprising:
a light source;
a light guide opposed to the light source to guide light which is received from the light source;
a frame which supports the light source and the light guide, and has a projection which positions the light source and the light guide; and
an optical sheet which provides an optical property for light radiated from the light source, and has a regulation section that regulates contact between the light guide and the projection of the frame, the regulation section being located between the light guide and the projection,
wherein the optical sheet is substantially rectangular and larger than a section in which the light guide and the light source are arranged, and
the optical sheet is arranged to cover a side surface of the light guide which is not opposed to the light source, a side surface or a top surface of the light source which is not opposed to the light guide.
5. A liquid crystal display device including a liquid crystal display panel having an effective display section in which a plurality of display pixels are arranged and a planar light source device which illuminates the liquid crystal display panel,
the planar light source device comprising:
a light source;
a light guide opposed to the light source to guide light which is received from the light source;
a frame which supports the light source and the light guide and has a projection which positions the light source and the light guide; and
an optical sheet which provides an optical property for light radiated from the light source and has a regulation section that regulates contact between the light guide and the projection of the frame, the regulation section being located between the light guide and the projection,
wherein the light guide has a first main surface that is opposed to the liquid crystal display panel, a second main surface that is opposed to the frame, and a side surface that extends between the first main surface and the second main surface and is opposed to the projection, and
the optical sheet is opposed to one of the first main surface and the second main surface, and the regulation section has a tongue that extends from the optical sheet and is folded along the side surface of the light guide.
6. The liquid crystal display device according to claim 5 , wherein the light guide has a light incidence surface that receives light from the light source, and the first and second main surfaces of the light guide are opposed to each other from which light received from the light incidence surface is to be emitted, and
the optical sheet is arranged on the first main surface of the light guide, and the tongue is provided at the optical sheet.
7. The liquid crystal display device according to claim 5 , wherein the light guide has a light incidence surface that receives light from the light source, and the first and second main surfaces of the light guide are opposed to each other from which light received from the light incidence surface is to be emitted, and
the optical sheet is arranged between the frame and the second main surface of the light guide, and the tongue is provided at the optical sheet.
8. The liquid crystal display device according to claim 5 , wherein the optical sheet is each substantially rectangular and larger than a section in which the light guide and the light source are arranged, and
the optical sheet is arranged to cover a side surface of the light guide which is not opposed to the light source, and a side surface or a top surface of the light source which is not opposed to the light guide.