The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 2016
Filed:
Feb. 15, 2013
Sharp Kabushiki Kaisha, Osaka-shi, Osaka, JP;
Tohoku University, Sendai-shi, Miyagi, JP;
Tatsuo Uchida, Sendai, JP;
Yoshito Suzuki, Sendai, JP;
Tohru Kawakami, Sendai, JP;
Kazuo Sekiya, Sendai, JP;
Masahiro Nishizawa, Sendai, JP;
Takahiro Ishinabe, Sendai, JP;
Katsunori Ehara, Sendai, JP;
Yoshihiro Hashimoto, Osaka, JP;
Yasuhisa Itoh, Osaka, JP;
Yoshitaka Yamamoto, Osaka, JP;
Yutaka Ishii, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Tohoku University, Miyagi, JP;
Abstract
To provide a thin optical sheet having improved efficiency for light utilization, an optical sheet () of one mode of the present invention includes, in sequence from a light entry side to a light emission side, a plurality of first prisms (), a ¼ wavelength plate (), and a polarized-light separating element (), the plurality of first prisms () each having (i) a first surface () through which light enters the first prism and (ii) a second surface () that reflects the light, having entered the first prism, toward the light emission side, the optical film further including, between the plurality of first prisms in an in-plane direction of the optical film, a second prism () that reflects light.