Screen, its manufacturing method and image display system

• US 7,035,008 B2
• Filed: 04/11/2005
• Issued: 04/25/2006
• 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:
  US11/103,212
• Publication Number:
  US 20050180003A1
• Time in Patent Office: 379 Days
• Field of Search: 359/452, 359/453, 359/443, 359/449, 359/459, 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. An image display system comprising:

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

m are regularly aligned, said screen including a layer or a bulk substrate for absorbing visible light; and

a projector light source including semiconductor light emitting devices each for emitting light of a specific wavelength determined by the size and alignment of said particles;

wherein said layer or bulk substrate for absorbing visible light absorbs visible light of all wavelength bands.

2. An image display system comprising:

a screen configured to reflect light of specific wavelengths by using photonic crystals, said screen including a layer or a bulk substrate for absorbing visible light; and

a projector light source including semiconductor light emitting devices for emitting light of said specific wavelengths;

wherein said layer or bulk substrate for absorbing visible light absorbs visible light of all wavelength bands.

3. An image display system comprising:

a screen configured to reflect light of specific wavelengths by using a dielectric multi-layered film, said screen including a layer or a bulk substrate for absorbing visible light; and

a projector light source including semiconductor light emitting devices for emitting light of said specific wavelengths;

wherein said layer or bulk substrate for absorbing visible light absorbs visible light of all wavelength bands.

4. A screen comprising particles regularly aligned to reflect electromagnetic waves of specific wavelengths, said screen including a layer or a bulk substrate for absorbing visible light;

wherein said layer or bulk substrate for absorbing visible light absorbs visible light of all wavelength bands.

5. The screen according to claim 4 wherein said electromagnetic waves are visible light.

6. A screen comprising:

first particles regularly aligned to reflect an electromagnetic wave of a first wavelength; and

second particles regularly aligned to reflect an electromagnetic wave of a second wavelength different from said first wavelength,

wherein said first particles and said second particles are different in diameter;

wherein said screen includes a layer or a bulk substrate for absorbing visible light; and

wherein said layer or bulk substrate for absorbing visible light absorbs visible light of all wavelength bands.

7. The screen according to claim 6 wherein both said electromagnetic wave of said first wavelength and said electromagnetic wave of said second wavelength are visible light.