Screen, its manufacturing method and image display system

• US 20060033991A1
• Filed: 07/29/2005
• Published: 02/16/2006
• Est. Priority Date: 12/13/2001
• Status: Active Grant

• Current Assignee: Atsushi Toda, Hirotaka Akao, Ko Ishimoto, Michihiro Ohnishi, Yoshihiko Kuroki
• Original Assignee: Atsushi Toda, Hirotaka Akao, Ko Ishimoto, Michihiro Ohnishi, Yoshihiko Kuroki
• Inventors: Ishimoto, Ko, Kuroki, Yoshihiko, Toda, Atsushi, Ohnishi, Michihiro, Akao, Hirotaka
• Granted Patent: US 7,345,818 B2
• Time in Patent Office: Days
• 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

1-11. -11. (canceled)

12. 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.

13. The screen according to claim 12 wherein the stacking cycles are not less than eight cycles and not more than fifteen cycles.

14. The screen according to claim 12 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.

34. The screen according to claim 12 wherein the screen includes a substrate that underlies the particles, and the red-reflecting particle layer, the green-reflecting particle layer and the blue-reflecting particle layer are formed on said substrate via a buffer layer.

35. The screen according to claim 34 wherein said buffer layer is a layer of particles having a diameter not larger than 208×

(1.36/n) nm.

99. The screen according to claim 12 wherein said substrate is a transparent substrate having a layer for absorbing visible light on the back surface thereof.

100. The screen according to claim 12 wherein said substrate is a PET film.

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

102. The screen according to claim 12 wherein a light diffusion medium is provided on said particle layers.

103. The screen according to claim 102 wherein said light diffusing medium is a diffusion film.

104. The screen according to claim 102 wherein said light diffusing medium is a micro lens film.

105. The screen according to claim 102 wherein said light diffusing medium is a micro prism film.

106. The screen according to claim 12 wherein a red-reflecting particle layer, a green-reflecting particle layer and a blue-reflecting particle layer are formed on said substrate via a buffer layer.

107. The screen according to claim 106 wherein said buffer layer is a layer of particles having a diameter not larger than 208×

(1.36/n) nm.

15-33. -33. (canceled)

36-44. -44. (canceled)

45. 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.

46. The screen according to claim 45 wherein the array exhibits stacking cycles not less than eight and not more than 15.

47. The screen according to claim 45 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.

108. The screen according to claim 45 wherein said substrate is a transparent substrate having a layer for absorbing visible light on the back surface thereof.

109. The screen according to claim 45 wherein said substrate is a PET film.

110. The screen according to claim 45 wherein an irregularity or a film for improving the wettability is formed on the surface of said substrate.

111. The screen according to claim 45 wherein a light diffusion medium is provided on said photonic crystals.

112. The screen according to claim 111 wherein said light diffusing medium is a diffusion film.

113. The screen according to claim 111 wherein said light diffusing medium is a micro lens.

114. The screen according to claim 111, wherein said light diffusing medium is a micro prism film.

48-86. -86. (canceled)

87. A method for manufacturing a screen having a structure in which particles having a size not larger than 1 μ

m are regularly aligned, characterized in that said particles are aligned by self-organization.

88. A method for manufacturing a screen having a structure in which particles having a size not larger than 1 μ

m are regularly aligned, comprising;

a first step of immersing a substrate into a particle solution containing 2 weight % of particles;

a second step of wetting the surface of said substrate with said particle solution by pulling up said substrate into air at a speed not slower than 30 μ

m/s; and

a third step of drying said substrate wet with said particle solution in air.

89. The method for manufacturing a screen according to claim 88 wherein said first to third steps are repeated until a particle layer having a desired optical property or thickness is obtained.

90. The method for manufacturing a screen according to claim 88 wherein said substrate is changed in orientation by rotating said substrate within the plane thereof.

91. The method for manufacturing a screen according to claim 88 wherein said substrate is treated to improve the wettability of the surface thereof before immersion.

92-98. -98. (canceled)