Planar light source
First Claim
1. A planar light source, comprising:
- a light guide plate, comprising;
a plate portion, having a light incident surface, a reflective surface opposite to the light incident surface, a bottom surface, and a light exiting surface opposite to the bottom surface, wherein the light incident surface and the reflective surface are respectively connected to the bottom surface and the light exiting surface, and a height of the light incident surface, a height of the reflective surface, and a thickness of the plate portion are substantially the same; and
at least one prism portion, disposed on the bottom surface of the plate portion, wherein the prism portion has a first plane and a second plane, the first plane adjoins the second plane, an included angle between the first plane and the bottom surface is smaller than an included angle between the second plane and the bottom surface, and a shortest distance between the first plane and the light incident surface is smaller than a shortest distance between the second plane and the light incident surface, wherein a distance exists between the second plane and the reflective surface, and the distance is parallel to the light exiting surface, wherein a plurality of printed dots or micro-structures is disposed on the distance;
a light-absorbing material, directly adhered only to the second plane to mitigate bright lines caused by the light beam emitted out of the light guide plate due to reflection of the second plane; and
a light source device, disposed adjacent to the light incident surface.
2 Assignments
0 Petitions
Accused Products
Abstract
A planar light source including a light guide plate (LGP) and a light source device is provided. The LGP includes a plate portion and at least one prism portion. The plate portion has a light incident surface, a reflective surface, a bottom surface, and a light exiting surface. The prism portion is disposed on the bottom surface of the plate portion, and has a first plane and a second plane. An included angle between the first plane and the bottom surface is smaller than an included angle between the second plane and the bottom surface, and a shortest distance between the first plane and the light incident surface is smaller than a shortest distance between the second plane and the light incident surface. The light source device is disposed adjacent to the light incident surface. The disclosure provides planar light source with good light uniformity.
47 Citations
16 Claims
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1. A planar light source, comprising:
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a light guide plate, comprising; a plate portion, having a light incident surface, a reflective surface opposite to the light incident surface, a bottom surface, and a light exiting surface opposite to the bottom surface, wherein the light incident surface and the reflective surface are respectively connected to the bottom surface and the light exiting surface, and a height of the light incident surface, a height of the reflective surface, and a thickness of the plate portion are substantially the same; and at least one prism portion, disposed on the bottom surface of the plate portion, wherein the prism portion has a first plane and a second plane, the first plane adjoins the second plane, an included angle between the first plane and the bottom surface is smaller than an included angle between the second plane and the bottom surface, and a shortest distance between the first plane and the light incident surface is smaller than a shortest distance between the second plane and the light incident surface, wherein a distance exists between the second plane and the reflective surface, and the distance is parallel to the light exiting surface, wherein a plurality of printed dots or micro-structures is disposed on the distance; a light-absorbing material, directly adhered only to the second plane to mitigate bright lines caused by the light beam emitted out of the light guide plate due to reflection of the second plane; and a light source device, disposed adjacent to the light incident surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification