Illuminating device, display device and optical film

• US 7,859,175 B2
• Filed: 05/16/2008
• Issued: 12/28/2010
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: Dawncrest IP LLC (IP Edge LLC)
• Original Assignee: Seiko Instruments Incorporated (Seiko Group)
• Inventors: Kurihara, Makoto, Morihara, Takafumi
• Primary Examiner(s): Patel, Vip
• Application Number:
  US12/152,782
• Publication Number:
  US 20080284316A1
• Time in Patent Office: 956 Days
• Field of Search: 313110-113
• US Class Current: 313/112
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material

Abstract

A display device has a light source that radiates light from a light-emitting portion. A light guide body receives an incident light from the light-emitting portion of the light source and emits light. A display element is illuminated by light emitted from the light guide body and has a color filter having a coloring layer of RGB. A filter layer reflects components of light having a wavelength in a preselected region of 570 nm to 590 nm among the light radiated from the light source and emitted from the light guide body. A phosphor is excited by the components of light in the preselected region reflected by the filter layer and emits red light that passes through the filter layer and through the color filter of the display element.

Claims

1. A display device comprising:

a light source that radiates light from a light-emitting portion;

a light guide body that receives an incident light from the light-emitting portion of the light source and that emits light;

a display element that is illuminated by light emitted from the light guide body, the display element having a color filter having a coloring layer of RGB;

a filter layer that reflects components of light having a wavelength in a preselected region of 570 nm to 590 nm from among components of the light radiated from the light source and emitted from the light guide body; and

a phosphor that is excited by the components of light in the preselected region reflected by the filter layer and that emits red light that passes through the filter layer and through the color filter of the display element.

2. A display device according to claim 1;

further comprising a phosphor layer containing the phosphor and a base film on which the phosphor layer and the filter layer are formed.

3. A display device according to claim 1;

wherein the light source is disposed between the phosphor and the filter layer.

4. A display device according to claim 1;

wherein the light guide body has an incident surface that receives the incident light from the light-emitting portion of the light source and an emission surface that emits the light from the light guide body; and

wherein the filter layer is disposed between the light source and the incident surface of the light guide body.

5. A display device according to claim 4;

wherein the light source comprises a point light source; and

wherein the filter layer is disposed over an entire surface of the incident surface of the light guide body.

6. A display device according to claim 1;

wherein the filter layer is formed on opposite surfaces of a base film.

7. A display device according to claim 1;

wherein the filter layer is disposed between the light guide body and the display element.

8. A display device according to claim 1;

wherein the filter layer comprises a first filter layer; and

further comprising a second filter layer that reflects components of light having a wavelength in a preselected region of 480 nm to 500 nm from among components of the light radiated from the light source and emitted from the light guide body.

9. A display device according to claim 8;

wherein the first filter layer is disposed between the light-emitting portion of the light source and the display element, and the second filter layer is disposed between the light-emitting portion of the light source and the first filter layer; and

wherein the phosphor is excited by the components of light in both the preselected region of 570 nm to 590 nm reflected by the first filter layer and the preselected region of 480 nm to 500 nm reflected by the second filter layer to emit light that passes through the first and second filter layers.

10. A display device according to claim 8;

wherein the phosphor comprises a first phosphor; and

further comprising a second phosphor that is excited with the components of light reflected by the second filter layer to emit green light that passes through at least one of the first and second filter layers, the second phosphor being disposed between the second filter layer and the light-emitting portion of the light source.

11. A display device according to claim 8;

wherein at least one of the first filter layer and the second filter layer comprises a base film and a plurality of nanoparticles of about 200 nm to 300 nm laminated on the base film.

12. A display device comprising:

a light source;

a light guide that receives light from the light source and that emits the light from an emission surface, the light including light components having a wavelength in at least one region of 480 nm to 500 nm and 570 nm to 590 nm;

a display element provided on an emission surface side of the light guide, the display element having a red filter, a green filter and a blue filter;

a filter layer that reflects components of light having a wavelength in the at least one region of 480 nm to 510 nm and 570 nm to 590 nm; and

a phosphor that is excited by the components of light having a wavelength in the at least one region of 480 nm to 510 nm and 570 nm to 590 nm and reflected by the filter layer and that emits light of a wavelength that passes through the filter layer and through at least one of the red filter, the green filter and the blue filter of the display element.

13. A display device according to claim 12;

further comprising a phosphor layer containing the phosphor and a base film on which the phosphor layer and the filter layer are formed.

14. A display device according to claim 12;

wherein the light source is disposed between the phosphor and the filter layer.

15. A display device according to claim 12;

wherein the light guide body has an incident surface that receives the light from the light source; and

wherein the filter layer is disposed between the light source and the incident surface of the light guide body.

16. A display device according to claim 15;

wherein the light source comprises a point light source; and

wherein the filter layer is disposed over an entire surface of the incident surface of the light guide body.

17. A display device according to claim 12;

wherein the filter layer is formed on opposite surfaces of a base film.

18. A display device according to claim 12;

wherein the filter layer is disposed between the light guide body and the display element.

19. A display device according to claim 12;

wherein the filter layer comprises a first filter layer that reflects components of light having a wavelength in the at least one region of 480 nm to 510 nm and a second filter layer that reflects components of light having a wavelength in the at least one region of 570 nm to 590 nm.

20. A display device according to claim 19;

wherein the first filter layer is disposed between the light source and the display element, and the second filter layer is disposed between the light source and the first filter layer.