Illumination apparatus, display apparatus, and method of producing an illumination apparatus
[Object] To provide an illumination apparatus capable of suppressing a chromaticity fluctuation due to a view angle and an incident angle. [Solving Means] In an illumination apparatus for a display apparatus that includes a blue-color light-emitting diode ( 10 ) as a light source and a phosphor sheet ( 21 ) including a phosphor that obtains white light by converting a color of blue light from the blue-color light-emitting diode ( 10 ), diffusion plates ( 22, 23 ) are respectively provided opposed to a light-emitting-side surface and a light-incident-side surface of the phosphor sheet ( 21 ). The diffusion plate ( 22 ) opposed to the light-emitting-side surface of the phosphor sheet ( 21 ) suppresses a fluctuation of white-color chromaticity due to a view angle, and the diffusion plate ( 23 ) opposed to the light-incident-side surface of the phosphor sheet ( 21 ) suppresses a fluctuation of white-color chromaticity due to an incident angle.
1. An illumination apparatus, comprising:
a light source formed on a substrate;
a phosphor portion comprising a phosphor to obtain white light from light produced by the light source;
at least one support structure formed between the substrate and the phosphor portion to create a gap between the phosphor portion and the substrate; and
a light diffusion means provided in correspondence with a surface of the phosphor portion.
2. The illumination apparatus according to claim 1 ,
wherein the light diffusion means is provided to face a light-incident surface of the phosphor portion.
3. The illumination apparatus according to claim 2 ,
wherein a total diffused transmittance of the light diffusion means is 50% or more and 66% or less.
4. The illumination apparatus according to claim 1 ,
wherein the light diffusion means is provided to face a light-emitting surface of the phosphor portion.
5. The illumination apparatus according to claim 1 ,
wherein the light diffusion means includes a first light diffusion means provided to face a light-incident surface of the phosphor portion and a second light diffusion means provided to face a light-emitting surface of the phosphor portion.
6. The illumination apparatus according to claim 5 ,
wherein the first light diffusion means and the second light diffusion means are respectively provided in close contact with the light-incident surface and the light-emitting surface of the phosphor portion.
7. The illumination apparatus according to claim 5 ,
wherein the first light diffusion means and the second light diffusion means are respectively provided apart from the light-incident surface and the light-emitting surface of the phosphor portion.
8. The illumination apparatus according to claim 5 ,
wherein the light source comprises a plurality of light source devices that are arranged two-dimensionally, and
wherein emission luminance of the plurality of light source devices can be controlled individually for each of a plurality of areas into which the surface of the phosphor portion is divided.
9. The illumination apparatus according to claim 5 ,
wherein the light source is a blue-color light-emitting diode, and
wherein the phosphor portion includes a second phosphor to emit yellow light by being excited by blue light as excitation light.
10. The illumination apparatus according to claim 1 ,
wherein the phosphor portion comprises a first layer that contains a phosphor material as a main component and the light diffusion means comprises a second layer that contains a light diffusion material as a main component, the first layer and the second layer being integrated by a medium material.
11. The illumination apparatus according to claim 1 ,
wherein a total diffused transmittance of the light diffusion means is 66% or less.
12. The illumination apparatus according to claim 1 , wherein the at least one support structure comprises a light guide plate.
13. A display apparatus, comprising:
a display panel; and
an illumination apparatus provided adjacent to a back surface of the display panel, the illumination apparatus including
a light source,
a phosphor portion comprising a phosphor that obtains white light produced by the light source, and
a light diffusion means provided in correspondence with a surface of the phosphor portion.
14. An illumination apparatus, comprising:
a light source;
a light guide plate that one end surface of the light guide plate is irradiated by light from the light source;
a phosphor portion constituted of a phosphor that obtains white light from light emitted by a light-emitting-side surface of the light guide plate; and
a light diffusion means provided in correspondence with a surface of the phosphor portion.
15. The illumination apparatus according to claim 14 , wherein the light diffusion means is provided to face a light-incident surface of the phosphor portion.
16. The illumination apparatus according to claim 15 , wherein a total diffused transmittance of the light diffusion means is 50% or more and 66% or less.
17. The illumination apparatus according to claim 14 , wherein the light diffusion means is provided to face a light-emitting surface of the phosphor portion.
18. The illumination apparatus according to claim 14 , wherein the light diffusion means includes a first light diffusion means provided to face a light-incident surface of the phosphor portion and a second light diffusion means provided to face a light-emitting surface of the phosphor portion.
19. The illumination apparatus according to claim 18 , wherein the first light diffusion means and the second light diffusion means are respectively provided in close contact with the light-incident surface and the light-emitting surface of the phosphor portion.
20. The illumination apparatus according to claim 18 , wherein the first light diffusion means and the second light diffusion means are respectively provided apart from the light-incident surface and the light-emitting surface of the phosphor portion.
21. The illumination apparatus according to claim 18 , wherein the light source is a blue-color light-emitting diode, and wherein the phosphor portion includes a second phosphor to emit yellow light by being excited by blue light as excitation light.
22. The illumination apparatus according to claim 14 , wherein the phosphor portion comprises a first layer that contains a phosphor material as a main component, and the light diffusion means comprises a second layer that contains a light diffusion material as a main component, the first layer and the second layer being integrated by a medium material.
23. The illumination apparatus according to claim 14 , wherein a total diffused transmittance of the light diffusion means is 66% or less.
24. A display apparatus, comprising:
a display panel; and
an illumination apparatus provided adjacent to aback surface of the display panel, the illumination apparatus including
a light source,
a phosphor portion constituted of a phosphor to obtain white light produced by the light source, and
a light diffusion means provided in correspondence with a surface of the phosphor portion.