Backlight system

Patent metadata

Field	Value
Publication number	US-9411090-B2
Application number	US-201213977318-A
Country	US
Kind code	B2
Filing date	Nov 21, 2012
Priority date	Nov 21, 2012
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Backlight systems including a core layer, configured to be flexible, and at least one light source are described. The core layer contains at least one light-excited fluorophore. The light source is arranged on an edge of one side of the core layer. Further, the light source is configured to emit first light into the core layer through the edge of the one side of the core layer. The core layer is configured to transmit the first light therein and to emit second light caused by the light-excited fluorophores irradiated by the first light from a first surface of the core layer.

First claim

The invention claimed is:

1. A backlight system comprising:
a core layer configured to be flexible and containing light-excited fluorophores therein;
at least one light source arranged on an edge of one side of the core layer and configured to emit first light into the core layer through the edge thereof,
wherein the light-excited fluorophores are dispersed in the core layer; and
wherein the core layer is configured to transmit the first light therein and to emit second light caused by the light-excited fluorophores irradiated by the first light from a first surface of the core layer; and

a shell layer arranged on the first surface of the core layer, wherein the shell layer has a lower reflectance than the core layer.

2. The backlight system of claim 1 , further comprising a reflective layer arranged on at least a portion of a second surface of the core layer opposing the first surface.

3. The backlight system of claim 2 , wherein the reflective layer is comprised of at least one material selected from the group consisting of a metal, a metal oxide and a polymer.

4. The backlight system of claim 2 , wherein the reflective layer is comprised of at least one material having a refractive index of 1.7 or higher.

5. The backlight system of claim 1 , wherein the at least one light source is a light emitting diode configured to emit ultraviolet light.

6. The backlight system of claim 5 , wherein the light-excited fluorophores are ultraviolet-excited fluorophores adapted to emit visible light by irradiation of the ultraviolet light.

7. The backlight system of claim 1 , wherein the core layer is formed of a transparent polymer.

8. The backlight system of claim 7 , wherein the transparent polymer is a thermoplastic elastomer.

9. The backlight system of claim 8 , wherein the thermoplastic elastomer is at least one thermoplastic elastomer selected from the group consisting of olefin-type elastomer, rubber containing polypropylene, styrene-based elastomer, acryl-based elastomer, polyurethane-based elastomer, silicone rubber, silicone elastomer, polycarbonate film and transparent polyimide.

10. The backlight system of claim 1 , wherein the light-excited fluorophores are comprised of a metal complex.

11. The backlight system of claim 1 , wherein the light-excited fluorophores are comprised of at least one metal complex selected from the group consisting of europium complex, niobium complex, praseodymium complex, neodymium complex, samarium complex, gadolinium complex, terbium complex, dysprosium complex, holmium complex, erbium complex, thulium complex and ytterbium complex.

12. The backlight system of claim 1 , wherein the light-excited fluorophores are comprised of at least one metal complex selected from the group consisting of compounds represented by the following, formulae (1) to (10);

wherein, R 1 , R 2 , R 3 and R 4 each independently represent an organic group, and R 1 and R 2 differ from each other,

wherein, R 1 , R 2 , R 3 and R 4 each independently represent an organic group, and R 1 and R 2 differ from each other,

wherein, n is an integer of from 1 to 18 inclusive,

wherein, m and n are each independently integers of from 1 to 18 inclusive,

wherein, n is an integer of from 1 to 18 inclusive,

wherein, n is an integer of from 1 to 18 inclusive, and D represents deuterium,

wherein, D represents deuterium,

wherein, D represents deuterium,

wherein, n is an integer of from 1 to 18 inclusive, and

wherein, D represents deuterium.

13. The backlight system of claim 1 , wherein the shell layer is comprised of at least one material selected from the group consisting of a metal, a metal oxide and a polymer.

14. The backlight system of claim 1 , wherein the shell layer is comprised of at least one material having a refractive index of 1.7 or higher.

15. The backlight system of claim 1 , wherein a concentration of the light-excited fluorophores is defined to increase as the distance from the edge of the at least one side of the core layer increases.

16. A display system comprising a backlight system, wherein the backlight system comprises:
a core layer, configured to be flexible, and containing light-excited fluorophores therein;
at least one light source arranged on an edge of one side of the core layer and configured to emit first light into the core layer through the edge thereof,
wherein the light-excited fluorophores are dispersed in the core layer; and
wherein the core layer is configured to transmit the first light therein and to emit second light caused by the light-excited fluorophores irradiated by the first light from a first surface of the core layer; and

a shell layer arranged on the first surface of the core layer, wherein the shell layer has a lower reflectance than the core layer.

17. A method of controlling illumination of a backlight system, the method comprising:
introducing first light by at least one light source through the edge of one side of a core layer containing light-excited fluorophores therein;
emitting second light caused by the light-excited fluorophores, wherein the light-excited fluorophores are dispersed in the core layer; and wherein the core layer is configured to be flexible; and
reflecting the first light by a shell layer arranged on a first surface of the core layer, wherein the shell layer has a lower reflectance than the core layer.

18. The method of claim 17 , wherein the first light is ultraviolet light.

19. The method of claim 18 , wherein the light-excited fluorophores are ultraviolet-excited fluorophores configured to emit visible light by irradiation of the ultraviolet light.

20. A method of manufacturing a backlight system, the method comprising:
mixing light-excited fluorophores and transparent polymer to obtain a mixture;
extruding the mixture to obtain a flexible core layer, wherein the light-excited fluorophores are dispersed in the core layer;
arranging, at least one light source on an edge of one side of the core layer so as to emit first light into the core layer through the edge thereof, wherein the core layer is configured to transmit the first light therein and to emit second light caused by the light-excited fluorophores irradiated by the first light from a first surface of the core layer; and
providing a shell layer on the first surface of the core layer, wherein the shell layer has a lower reflectance than the core layer.

Assignees

• Hashizume Kenichi
• Kuroki Shunichiro
• Empire Technology Dev Llc

Inventors

• Hashizume Kenichi
• Kuroki Shunichiro

Classifications

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02F1/133615

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

• G02B6/0003 Primary

  the light guides being doped with fluorescent agents · CPC title

• G02B6/0035 Primary

  provided on the surface of the light guide or in the bulk of it · CPC title