Display device

Patent metadata

Field	Value
Publication number	US-11360255-B2
Application number	US-201916705580-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Dec 11, 2018
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A display device comprises a liquid crystal panel, an optical sheet under the liquid crystal panel, and a light emitting diode (LED) assembly configured to supply a light to the liquid crystal panel through the optical sheet. The LED assembly includes a printed circuit board (PCB), a plurality of LED chips on the PCB and configured to emit a blue colored light, a fluorescent lens over the plurality of LED chips, and a light guiding panel between an adjacent two of the plurality of LED chips.

First claim

What is claimed is:

1. A display device, comprising:
a liquid crystal panel;
an optical sheet under the liquid crystal panel; and
a light emitting diode (LED) assembly configured to supply a light to the liquid crystal panel through the optical sheet, the LED assembly including:
a printed circuit board (PCB);
a plurality of LED chips on the PCB, the plurality of LED chips being configured to emit a blue colored light;
a fluorescent lens extending over the plurality of LED chips; and
a light guiding panel between an adjacent two of the plurality of LED chips,

wherein the light emitted from the plurality of LED chips enters the light guiding panel and is diffused in the light guiding panel through a plurality of total reflections to be emitted from the light guiding panel,
wherein the light guiding panel surrounds and faces four side surfaces of each of the plurality of LED chips,
wherein the light guiding panel includes a plurality of holes, and
wherein the plurality of LED chips respectively penetrate the plurality of holes.

2. The display device of claim 1 , wherein the light guiding panel includes a pattern configured to totally reflect the blue colored light.

3. The display device of claim 1 , wherein the light guiding panel has a bar shape corresponding to a length of the PCB.

4. The display device of claim 1 , wherein the fluorescent lens is over the plurality of LED chips and the light guiding panel.

5. The display device of claim 1 , wherein the fluorescent lens has a sheet shape over the plurality of LED chips and the light guiding panel.

6. The display device of claim 1 , wherein the fluorescent lens includes a yellow fluorescent material.

7. The display device of claim 1 , further comprising:
a light guide plate under the optical sheet; and
a main frame surrounding the LED assembly.

8. The display device of claim 7 , wherein:
the PCB contacts and is fixed to an inner side surface of the main frame; and
the LED assembly is at a side of the light guide plate to supply a linear light to the light guide plate through the fluorescent lens.

9. The display device of claim 7 , wherein:
the PCB contacts and is fixed to an inner upper surface of the main frame; and
the LED assembly is at a side of the light guide plate to supply a linear light to the light guide plate through the light guiding panel.

10. The display device of claim 1 , further comprising:
a diffusing plate under the optical sheet;
a main frame surrounding the LED assembly; and
a bottom frame under the LED assembly.

11. The display device of claim 10 , wherein:
the PCB contacts and is fixed to the bottom frame; and
the LED assembly is under the diffusing plate to supply a plane light to the diffusing plate.

12. The display device of claim 1 , wherein the light enters the light guiding panel through a side surface and is emitted from the light guiding panel through a front surface perpendicular to the side surface.

13. A display device, comprising:
a liquid crystal panel;
an optical sheet under the liquid crystal panel; and
a light emitting diode (LED) assembly configured to supply a light to the liquid crystal panel through the optical sheet, the LED assembly including:
a printed circuit board (PCB);
a plurality of LED chips on the PCB, the plurality of LED chips being configured to emit a blue colored light;
a respective fluorescent lens over each of the plurality of LED chips, a fluorescent material of the fluorescent lens respectively directly contacting and covering the entire top and outer side surfaces of each of the plurality of LED chips; and
a light guiding panel between an adjacent two of the plurality of LED chips,

wherein the light emitted from the plurality of LED chips enters the light guiding panel and is diffused in the light guiding panel through a plurality of total reflections to be emitted from the light guiding panel,
wherein the light guiding panel surrounds and faces four side surfaces of each of the plurality of LED chips,
wherein the light guiding panel includes a plurality of holes, and
wherein the plurality of LED chips respectively penetrate the plurality of holes.

14. The display device of claim 13 , wherein the fluorescent lens is separated from an inner sidewall of a respective one of the holes and has a flat top surface.

15. The display device of claim 13 , wherein a respective one of the holes is between each of the fluorescent lenses and the light guiding panel.

16. The display device of claim 13 , wherein:
the fluorescent lens includes a plurality of lenses; and
each of the plurality of lenses respectively contacts and surrounds each of the plurality of LED chips.

17. The display device of claim 16 , wherein the fluorescent lens and the light guiding panel constitute a same plane.

18. The display device of claim 13 , wherein the light guiding panel includes a pattern configured to totally reflect the blue colored light.

19. The display device of claim 1 , wherein the light guiding panel has a bar shape corresponding to a length of the PCB.

20. The display device of claim 1 , wherein the fluorescent lens contacts a whole of a top surface of the light guiding panel and has a flat top surface.

Assignees

• Lg Display Co Ltd

Inventors

• Oh Ji-Soon
• Jung Yeoun-Jei

Classifications

• G02B6/0021

  for housing at least a part of the light source, e.g. by forming holes or recesses · CPC title

• G02B6/0068 Primary

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

• G02B6/003

  Lens or lenticular sheet or layer · CPC title

• G02B6/009

  of the light source in the package (G02B6/0021 takes precedence) · CPC title

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title