Backlight apparatus and display apparatus having the same

Patent metadata

Field	Value
Publication number	US-10012782-B2
Application number	US-201514820753-A
Country	US
Kind code	B2
Filing date	Aug 7, 2015
Priority date	Dec 15, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Disclosed herein are a backlight apparatus and a display apparatus having a light guide plate that includes light guide patterns in a waveform shape.

First claim

What is claimed is:

1. A backlight apparatus comprising:
a plurality of light sources configured to generate light; and
a light guide plate configured to guide the generated light towards a display panel,
wherein the light guide plate comprises light guide patterns provided in a length direction that is a first direction in which the plurality of the light sources is disposed, and disposed to be spaced from each other by a predetermined distance,
wherein the light guide patterns are configured to form a waveform transverse in the first direction,
wherein the plurality of light sources comprises a first light source provided on a first side of the light guide plate, and a second light source provided on a second side of the light guide plate, the first side of the light guide plate opposing the second side of the light guide plate,
wherein the light guide patterns comprise a first light guide pattern adjacent to the plurality of light sources, and a second light guide pattern spaced apart from the plurality of light sources further than the first light guide pattern, and
wherein the second light guide pattern is larger than the first light guide pattern.

2. The backlight apparatus according to claim 1 , wherein the waveform comprises a sinusoidal waveform of a plurality of grooves disposed towards the light source and a plurality of threads interconnecting the plurality of grooves and disposed away from the light source, and
wherein the plurality of grooves and the plurality of threads are alternately disposed.

3. The backlight apparatus according to claim 1 , wherein the light guide plate comprises:
an incident surface upon which the light is incident;
an exit surface from which the light is emitted; and a reflective surface opposing the exit surface,
wherein the light guide patterns are disposed on the reflective surface.

4. The backlight apparatus according to claim 3 , wherein each of the light guide patterns comprises:
a pattern protrusion part configured to form the waveform;
a first inclined surface extended from the reflective surface towards the pattern protrusion part; and
a second inclined surface extended from the reflective surface towards the pattern protrusion part,
wherein the first inclined surface is disposed closer to the plurality of light sources than the second inclined surface.

5. The backlight apparatus according to claim 4 , wherein the first inclined surface and the second inclined surface have a shape of the waveform.

6. The backlight apparatus according to claim 4 , wherein the pattern protrusion part is a certain height from the reflective surface that is disposed closer to the exit surface than the reflective surface.

7. The backlight apparatus according to claim 1 ,
wherein each of the light guide patterns comprises:
a pattern protrusion part configured to form the waveform;
a first inclined surface extended from the reflective surface towards the pattern protrusion part; and
a second inclined surface extended from the reflective surface towards the pattern protrusion part,
wherein the first inclined surface is disposed closer to the plurality of light sources than the second inclined surface.

8. The backlight apparatus according to claim 7 , wherein the first light source comprises a first plurality of light emitting diodes (LEDs) and the second light source comprises a second plurality of LEDs,
wherein the first plurality of LEDs and the second plurality of LEDs are spaced apart from each other in the first direction.

9. The backlight apparatus according to claim 1 , wherein the light guide patterns comprise a plurality of sub light guide patterns provided in parallel to the light source and spaced apart from to each other.

10. The backlight apparatus according to claim 9 , wherein the plurality of sub light guide patterns comprises:
a first array of sub light guide patterns arranged in parallel to the light source; and
a second array of sub light guide patterns adjacent to the first array,
wherein the first array of sub light guide patterns and the second array of sub light guide patterns are parallel to each other.

11. The backlight apparatus according to claim 9 , wherein the plurality of sub light guide patterns comprises:
a first plurality of sub light guide patterns of a first array in parallel to the light source; and
a second plurality of sub light guide patterns of a second array adjacent to the first array,
wherein the first plurality of sub light guide patterns of the first array and the second plurality of sub light guide patterns of the second array are alternately disposed.

12. The backlight apparatus according to claim 9 , wherein the plurality of sub light guide patterns comprises:
a first plurality of sub light guide patterns of a first array in parallel to the light source; and
a second plurality of sub light guide patterns of a second array adjacent to the first array,
wherein the second plurality of sub light guide patterns of the second array is formed to be larger than the first plurality of sub light guide patterns of the first array.

13. The backlight apparatus according to claim 1 , wherein the plurality of light sources comprises:
a plurality of light emitting diodes (LEDs) spaced apart from each other in the first direction in at least one side of the light guide plate.

14. The backlight apparatus according to claim 1 , wherein the pattern protrusion part is formed in a rounded shape.

15. The backlight apparatus according to claim 4 , wherein the pattern protrusion part is formed by a tangent line of the first inclined surface and the second inclined surface.

16. The backlight apparatus according to claim 1 , wherein the light guide patterns are formed to have a cross section of semi-circular shape or a semi-ovular shape.

17. The backlight apparatus according to claim 1 , wherein the waveform is formed to have a wavelength of 20˜50 μm.

18. The backlight apparatus according to claim 1 , wherein the waveform is formed to have an amplitude of 1˜2 μm.

19. The backlight apparatus according to claim 3 , wherein the light guide patterns are formed to be concave with respect to the reflective surface in the light guide plate, and
wherein the reflective surface comprises a reflection coating applied to the reflective surface so that the path of light incident from the incident surface is guided to the exit surface.

20. The backlight apparatus according to claim 3 , wherein the backlight apparatus further comprises:
a diffusion unit disposed between the light guide plate and the light source, the diffusion unit configured to disperse light emitted from the light source and incident to the incident surface.

21. The backlight apparatus according to claim 20 , wherein the diffusion unit comprises at least one of a diffusion member and a reflective polarizing film.

22. The backlight apparatus according to claim 21 , wherein the diffusion unit further comprises a prism sheet.

23. A display apparatus comprising:
a display panel; and
a backlight apparatus supplying light to the display panel, wherein the backlight apparatus comprises:
a plurality of light sources; and
a light guide plate configured to guide light incident from the light source towards the display panel, wherein the light guide plate comprises:
an incident surface upon which the light is incident;
an exit surface from which the light is emitted; and
light guide patterns provided in paral

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Won Yong
• Sohn Sang Hyun

Classifications

• G02B6/0016 Primary

  Grooves, prisms, gratings, scattering particles or rough surfaces · CPC title

• G02B6/0038 Primary

  Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide · CPC title

• G02B6/0036

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G02B6/0025

  Diffusing sheet or layer; Prismatic sheet or layer · CPC title