PLANAR LIGHT SOURCE DEVICE

Abstract

A planar light source device includes: a plurality of point light sources, each of which emits a light; a light guide plate that includes a first surface, and a second surface perpendicular to the first surface, and that is configured to guide the emitted lights incident from the first surface to be emitted from the second surface; a bottom case including a side portion substantially parallel to the first surface; a light source substrate that includes the plurality of point light sources arranged thereon at a predetermined interval, and that is arranged at a side of the first surface; a frame that sandwiches the light source substrate and the side portion of the bottom case and holds the second surface and that includes a plurality of gaps at positions facing the point light source.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will be described in detail based on the following figures, wherein:

FIG. 1 is an exploded perspective view of a planar light source device according to Embodiment 1;

FIG. 2 is a cross-sectional view of a point light source part shown in FIG. 1 along the X-X direction;

FIG. 3 is a cross-sectional view of area between adjacent point light sources shown in FIG. 1 along the X-X direction;

FIG. 4 is a cross-sectional view of the proximity to both ends of a light source substrate shown in FIG. 1 along the X-X direction;

FIG. 5 is an enlarged perspective view of a planar light source device according to Embodiment 1;

FIG. 6 is a cross-sectional view of the area between adjacent point light sources shown in FIG. 1 along the X-X direction according to Embodiment 2; and

FIG. 7 is a cross-sectional view of area between adjacent point light sources shown in FIG. 1 along the X-X direction according to Embodiment 3.

Claims

1. A planar light source device comprising: a plurality of point light sources, each of which emits a light;a light guide plate including a first surface, and a second surface perpendicular to the first surface, the light guide plate being configured to guide the emitted lights incident from the first surface to be emitted from the second surface;a bottom case including a side portion substantially parallel to the first surface;a light source substrate including the plurality of point light sources arranged thereon at a predetermined interval, the light source substrate being arranged at a side of the first surface;a frame that sandwiches the light source substrate and the side portion of the bottom case and holds the second surface, the frame including a plurality of gaps at positions facing the point light sources.

2. The planar light source device according to claim 1, wherein the second surface includes exposed parts facing portions between adjacent point light sources, andwherein the emitted lights from the point light sources enter the exposed parts.

3. The planar light source device according to claim 1, wherein the frame holds the first surface of the light guide plate.

4. The planar light source device according to claim 1, wherein the light guide plate includes two side surfaces perpendicular to the second surface and sandwich the first surface, andwherein the frame holds the two side surfaces of the light guide plate.

5. The planar light source device according to claim 1, wherein the frame is white.

6. The planar light source device according to claim 1, wherein the light source substrate includes a convex portion between adjacent point light sources.

7. The planar light source device according to claim 6, wherein the convex portion includes a dome-shaped solder.

8. The planar light source device according to claim 1, wherein the point light sources include light-emitting diodes.

9. The planar light source device according to claim 1, wherein the frame holds the first surface of the light guide plate.

10. The planar light source device according to claim 9, wherein the light guide plate includes two side surfaces perpendicular to the second surface and sandwich the first surface, andwherein the frame holds the two side surfaces of the light guide plate.