Screen, its manufacturing method and image display system

• US 7,345,818 B2
• Filed: 07/29/2005
• Issued: 03/18/2008
• Est. Priority Date: 12/13/2001
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ishimoto, Ko, Kuroki, Yoshihiko, Toda, Atsushi, Ohnishi, Michihiro, Akao, Hirotaka
• Primary Examiner(s): MAHONEY, CHRISTOPHER E
• Application Number:
  US11/194,031
• Publication Number:
  US 20060033991A1
• Time in Patent Office: 963 Days
• Field of Search: 359/443, 359/449, 359452-453, 359/460
• US Class Current: 359/452
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02B 1/005 made of photonic crystals or photonic band gap materials photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295
• CPC Class Codes: G02B 5/003 Light absorbing elements
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G02F 2202/32 Photonic crystals
• CPC Class Codes: G03B 21/56 Projection screens
• CPC Class Codes: G03B 21/567 for colour projection G03B21/58, G03B21/60 take precedence
• CPC Class Codes: G03B 21/60 characterised by the nature of the surface

Abstract

A projection screen comprises a red-reflecting particle layer, green-reflecting particle layer and blue-reflecting particle layer sequentially stacked on a substrate. In each particle layer, particles are accumulated by eleven cycles in a regularly alignment such as close packed structure. Diameter of red reflecting particles is approximately 280 nm, diameter of green-reflecting particles is approximately 235 nm, and diameter of blue-reflecting particles is approximately 212 nm. Each particles layer is accumulated by self-organized technique. The substrate used here can absorb light of wavelengths other than those of red, green and blue three primary colors.

Claims

1. A screen comprising a structure in which particles having a size not larger than 1 μ

m are regularly aligned, a substrate, a red-reflecting particle layer, a green-reflecting particle layer and a blue-reflecting particle layer formed on said substrate via a buffer layer, said red-, green- and blue-reflecting particle layers being arrayed in the lateral direction on said substrate.

2. The screen according to claim 1 wherein the array exhibits stacking cycles not less than eight cycles and not more than fifteen cycles.

3. The screen according to claim 1 wherein said red-reflecting particle layer, said green-reflecting particle layer and said blue-reflecting particle layer are stripe-shaped, rectangular-shaped or square-shaped, and said particle layers are arrayed in a predetermined alignment pattern on said substrate.

4. The screen according to claim 1 wherein said buffer layer is a layer of particles having a diameter not larger than 208×

(1.36/n) nm.

5. The screen according to claim 1 wherein said substrate is a transparent substrate having a layer for absorbing visible light on the back surface thereof.

6. The screen according to claim 1 wherein said substrate is a PET film.

7. The screen according to claim 1 wherein an irregularity or a film for improving the wettability is formed on the surface of said substrate.

8. A screen configured to reflect light of specific wavelengths by using a photonic crystal, wherein a red-reflecting photonic crystal, a green-reflecting photonic crystal and a blue-reflecting photonic crystal are arrayed in the lateral direction on a substrate, and said array exhibits stacking cycles not less than eight and not more than 15.

9. The screen according to claim 8 wherein said red-reflecting photonic crystal, said green-reflecting photonic crystal and said blue-reflecting photonic crystal are stripe-shaped, rectangular-shaped or square-shaped, and said photonic crystals are arrayed in a predetermined alignment pattern on said substrate.

10. The screen according to claim 8 wherein said substrate is a transparent substrate having a layer for absorbing visible light on the back surface thereof.

11. The screen according to claim 8 wherein said substrate is a PET film.

12. The screen according to claim 8 wherein an irregularity or a film for improving the wettability is formed on the surface of said substrate.

13. A screen comprising a structure in which particles having a size not larger than 1 μ

m are regularly aligned, wherein a red-reflecting particle layer, a green-reflecting particle layer and a blue-reflecting particle layer are arrayed in the lateral direction on a substrate and wherein a light diffusion medium is provided on said particle layers.

14. The screen according to claim 13 wherein said light diffusing medium is a diffusion film.

15. The screen according to claim 13 wherein said light diffusing medium is a micro lens film.

16. The screen according to claim 13 wherein said light diffusing medium is a micro prism film.

17. A screen configured to reflect light of specific wavelengths by using a photonic crystal, wherein a red-reflecting photonic crystal, a green-reflecting photonic crystal and a blue-reflecting photonic crystal are arrayed in the lateral direction on a substrate and wherein a light diffusion medium is provided on said photonic crystals.

18. The screen according to claim 17 wherein said light diffusing medium is a diffusion film.

19. The screen according to claim 17 wherein said light diffusing medium is a micro lens.

20. The screen according to claim 17, wherein said light diffusing medium is a micro prism film.