Light guide plate, display device having the same, and method thereof
View Patent ↗A light guide plate and a display device having the same are provided, which can uniformly emit light on the whole. The light guide plate includes a light input part including first and second areas to which light is incident, and a light output part neighboring the light input part and outputting light. The light having passed through the first area is emitted with its light quantity distribution biased in a first direction, and the light having passed through the second area is emitted with its light quantity distribution biased in a second direction different than the first direction.
1. A light guide plate comprising:
a light input part including first and second areas to which light is incident; and
a light output part neighboring the light input part and outputting light;
wherein the light having passed through the first area is emitted with its light quantity distribution biased in a first direction, and the light having passed through the second area is emitted with its light quantity distribution biased in a second direction different from the first direction, and
wherein
the first area includes a row of a first serration pattern each including a first serrated thread adjacent to a normal line of the light output part,
the second area includes a row of a second serration pattern each including a second serrated thread adjacent to the normal line,
the first serrated thread overlaps the second serrated thread, and
the second serrated thread is inclined from the normal line in a different direction than the first serrated thread.
2. The light guide plate of claim 1 , wherein the first and the second serration patterns are symmetrical to each other around the normal line of the light input part.
3. The light guide plate of claim 2 , wherein the first and the second serrated threads of the first and the second serration patterns form a part of a right-angled triangle.
4. The light guide plate of claim 2 , wherein the first and the second serrated threads of the first and the second serration patterns form a part of an acute-angled triangle.
5. The light guide plate of claim 2 , wherein each of the first and the second serrated threads of the first and the second serration patterns is composed of an oblique side and a curved side.
6. The light guide plate of claim 2 , wherein each of the first and the second serrated threads of the first and the second serration patterns is composed of a first curved side and a second curved side having a radius of curvature smaller than that of the first curved side.
7. The light guide plate of claim 1 , wherein the light input part further includes a third area, and the third area symmetrically emits the light around the normal line of the light input part.
8. The light guide plate of claim 7 , wherein the third area includes a third serration pattern having a symmetrical cross section around the normal line of the light input part.
9. The light guide plate of claim 8 , wherein a third serrated thread of the third serration pattern forms a part of an isosceles triangle.
10. The light guide plate of claim 8 , wherein a pitch of the third serration pattern is formed to be smaller than a pitch of the first serration pattern or the second serration pattern.
11. The light guide plate of claim 8 , wherein the third serration pattern includes curved sides symmetrically formed.
12. The light guide plate of claim 1 , wherein the first area and the second area are arranged in parallel to a boundary part between the light input part and the light output part.
13. The light guide plate of claim 1 , wherein either of the first area and the second area is protruded to form a stepped portion.
14. A display device comprising:
a display panel on which an image is displayed;
a light source supplying light to the display panel;
a light input part including first and second areas to which light is incident; and
a light output part neighboring the light input part and outputting light;
wherein the light having passed through the first area is emitted with its light quantity distribution biased in a first direction, and the light having passed through the second area is emitted with its light quantity distribution biased in a second direction different from the first direction, and
wherein
the first area includes a row of a first serration pattern each including a first serrated thread adjacent to a normal line of the light output part,
the second area includes a row of a second serration pattern each including a second serrated thread adjacent to the normal line,
the first serrated thread overlaps the second serrated thread, and
the second serrated thread is inclined from the normal line in a different direction than the first serrated thread.
15. The display device of claim 14 , wherein the first and the second serration patterns are symmetrical to each other around the normal line of the light input part.
16. The display device of claim 15 , wherein the first and the second serrated threads of the first and the second serration patterns form a part of a right-angled triangle.
17. The display device of claim 15 , wherein the first and the second serrated threads of the first and the second serration patterns form a part of an acute-angled triangle.
18. The display device of claim 14 , wherein the light input part further includes a third area, and the third area symmetrically emits the light around the normal line of the light input part.
19. The display device of claim 18 , wherein the third area includes a third serration pattern having a symmetrical cross section around the normal line of the light input part.
20. The display device of claim 14 , wherein the light source comprises a plurality of point light sources.
21. A method of improving uniformity of light emission from a light guide plate, the light guide plate including a light input part to which light is incident and a light output part neighboring the light input part and outputting light, the method comprising:
forming a first area in the light input part to pass light therethrough with a light quantity distribution biased in a first direction, the first area including a row of a first serration pattern each including a first serrated thread adjacent to a normal line of the light output part; and,
forming a second area in the light input part to pass light therethrough with a light quantity distribution biased in a second direction, different than the first direction, the second area including a row of a second serration pattern each including a second serrated thread adjacent to the normal line,
wherein
the first serrated thread overlaps the second serrated thread, and
the second serrated thread is inclined from the normal line in a different direction than the first serrated thread.