| US 7,553,059 B2 | ||
| Optical sheet, and backlight unit and display using the same | ||
| Kenjiro Kuroda, Tokyo (Japan); Mitsuru Endo, Tokyo (Japan); Natsuka Sakai, Tokyo (Japan); Godai Fukunaga, Tokyo (Japan); Tomohiro Nakagome, Tokyo (Japan); Yoshiaki Shiina, Tokyo (Japan); and Luis Manuel Murillo-Mora, Tokyo (Japan) | ||
| Assigned to Toppan Printing Co., Ltd., Tokyo (Japan) | ||
| Filed on Oct. 26, 2007, as Appl. No. 11/925,160. | ||
| Application 11/925160 is a continuation of application No. 11/808120, filed on Jun. 06, 2007, granted, now 7,374,328. | ||
| Application 11/808120 is a continuation of application No. PCT/JP2006/301572, filed on Jan. 31, 2006. | ||
| Claims priority of application No. 2005-022936 (JP), filed on Jan. 31, 2005. | ||
| Prior Publication US 2008/0055929 A1, Mar. 06, 2008 | ||
| Int. Cl. F21V 7/04 (2006.01) | ||
| U.S. Cl. 362—607 [362/606; 362/609; 362/624] | 97 Claims |
| 1. An optical sheet for use in illumination light control in a backlight unit for a display, comprising:
a light diffusion layer which diffuses illumination light toward an emission surface side of the light diffusion layer, which
is a non-incidence surface side thereof;
an adhesion layer or an adhesive layer;
a light reflection layer which is adhered to the light diffusion layer by the adhesion layer or the adhesive layer, which
has a front surface extending along the emission surface side of the light diffusion layer, and having a high reflectivity
with respect to the emission surface side of the light reflection layer, and which reflects the light diffused by the light
diffusion layer toward the light diffusion layer; and
a lens sheet having a flat reverse surface fixed to the other surface of the light reflection layer, and a front surface on
which a plurality of unit lenses are provided,
wherein:
the light diffusion layer, the adhesion layer or the adhesive layer, the light reflection layer and the lens sheet are provided
in this order from an incidence side of the illumination light;
the light reflection layer includes opening portions which are formed therein in positions corresponding to those of the unit
lenses, respectively; and
the adhesion layer or the adhesive layer is thinner than the light reflection layer.
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