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:
Aug. 07, 2007
Filed:
Apr. 26, 2004
Hitomu Watanabe, Shinjuku-Ku, JP;
Makoto Honda, Shinjuku-Ku, JP;
Hitomu Watanabe, Shinjuku-Ku, JP;
Makoto Honda, Shinjuku-Ku, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
A contrast improving sheet includes a first optical functional element and a second optical functional element on the viewing side thereof. The first optical functional element has a plurality of protrusions, each having a pair of opposite total-reflection facets for totally reflecting image light rays substantially perpendicularly incident on the entrance surface and a flat facet extending between the front edges, on the side of the exit surface, of the pair of opposite total-reflection facets. Light absorbing layers are formed between the adjacent protrusions. The second optical functional element has a light path correcting layer for correcting light paths followed by the image light rays totally reflected by the total-reflection facets such that the image light rays are emitted through the exit surface substantially perpendicularly to the exit surface. The light path correcting layer has a plurality of alternately inclined planes inclined in opposite directions.