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:
Feb. 04, 1997
Filed:
Sep. 01, 1995
Muneo Maruyama, Tokyo, JP;
Koji Kashimoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A transmission liquid crystal display comprises a liquid crystal panel including at least two substrates spaced apart from one another through spacers to confine a liquid crystal between the two substrates; a surface light source provided at a first side of the liquid crystal panel; and an optical diffusion lens having a plate-like shape provided at a second side of the liquid crystal panel, the lens having first and second surfaces, the first surface facing to a display screen and the second surface facing to a liquid crystal panel, entire parts of the first surface is flat, and the second surface comprises alternating flat portions and convex or concave portions having a predetermined curvature, the convex or concave portions having a difference in level of a top portion thereof from the flat portions, the convex or concave portions being arranged at a predetermined pitch, wherein a ratio of the difference in level to the pitch is in the range from 2.9:10 to 0.8:10.