Display device including a filter for changing characteristics of light

Patent metadata

Field	Value
Publication number	US-10754080-B2
Application number	US-201716313119-A
Country	US
Kind code	B2
Filing date	Apr 10, 2017
Priority date	Jun 24, 2016
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A display device is disclosed. The display device according to the present disclosure includes a frame; a light assembly disposed in at least one edge area of the frame; a panel positioned in front of the frame; and a light guide plate positioned between the frame and the panel so that light emitted from the light assembly is transferred to the panel, wherein the light assembly includes a light source and a filter positioned at a light path between the light source and the light guide plate and changing characteristics of light emitted from the light source. The present disclosure can improve display quality of the display device by changing characteristics of light emitted from the light source.

First claim

The invention claimed is:

1. A display device comprising:
a display panel;
a light guide plate positioned in a rear of the display panel;
a frame positioned in a rear of the display panel; and
a light assembly disposed on at least one side of the light guide plate,
wherein the light assembly includes:
a light source; and
a filter positioned at a light path between the light source and the light guide plate and changing characteristics of light emitted from the light source,
wherein an outer surface of the filter adjacent to the light guide plate has a convex shape toward the light guide plate.

2. The display device of claim 1 , wherein the filter further includes:
a flat surface formed on an outer surface adjacent to the light source.

3. The display device of claim 1 , wherein the filter changes characteristics of light that passes through the filter and is incident on the light guide plate, so that a path of the light is perpendicular to an incident surface of the light guide plate.

4. The display device of claim 1 , wherein the light source includes a plurality of light sources spaced apart from one another, and
wherein the filter is positioned on an area corresponding to at least two of the plurality of light sources.

5. The display device of claim 1 , wherein the filter includes a plurality of stacked layers.

6. The display device of claim 1 , wherein the filter is a band pass filter (BPF) selectively transmitting light of a specific wavelength.

7. The display device of claim 1 , wherein the light source includes a fluorescent substance positioned on a path on which light emitted from the light source is incident on the filter.

8. The display device of claim 7 , wherein the light source further includes a barrier layer that is positioned on a side of the light source and reflects the light in a direction of the fluorescent substance.

9. A display device comprising:
a display panel;
a backlight unit positioned in a rear of the display panel; and
a frame positioned in a rear of the backlight unit,
wherein the backlight unit includes:
a reflective sheet; and
a light assembly providing light for the display panel through a plurality of coupling holes formed in the reflective sheet,
wherein the light assembly includes:
a light source; and
a filter positioned on a light path between the light source and the display panel and changing characteristics of light emitted from the light source,
wherein an outer surface of the filter adjacent to the light guide plate has a convex shape toward the light guide plate.

10. The display device of claim 9 , wherein the filter further includes:
a flat surface formed on an outer surface adjacent to the light source.

11. The display device of claim 9 , wherein the filter changes characteristics of light that passes through the filter and is incident on the display panel, so that a path of the light is perpendicular to an incident surface of the display panel.

12. The display device of claim 9 , wherein the light source includes a plurality of light sources spaced apart from one another, and
wherein the filter is positioned on an area corresponding to at least two of the plurality of light sources.

13. The display device of claim 9 , wherein the filter includes a plurality of stacked layers.

14. The display device of claim 9 , wherein the filter is a band pass filter (BPF) selectively transmitting light of a specific wavelength.

15. The display device of claim 9 , wherein the light source includes a fluorescent substance positioned on a path on which light emitted from the light source is incident on the filter.

16. The display device of claim 15 , wherein the light source further includes a barrier layer that is positioned on a side of the light source and reflects the light in a direction of the fluorescent substance.

Assignees

• Lg Electronics Inc

Inventors

• Sim Sujin
• BAEK Sangmin
• KIM Geunhwan
• Kim Minho
• Joung Juyoung

Classifications

• G02B6/10

  of the optical waveguide type (G02B6/02, G02B6/24 take precedence; devices or arrangements for the control of light by electric, magnetic, electro-magnetic or acoustic means G02F1/00; transferring the modulation of modulated light G02F2/00; optical logic elements G02F3/00; optical analogue/digital converters G02F7/00) · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0026 Primary

  Wavelength selective element, sheet or layer, e.g. filter or grating · CPC title

• G02B6/0013

  Means for improving the coupling-in of light from the light source into the light guide (coupling light into light guides in general G02B6/42) · CPC title

• G02B5/288

  comprising at least one thin film resonant cavity, e.g. in bandpass filters · CPC title