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:
Jul. 01, 2003
Filed:
Jan. 29, 2001
Laurent Georges, Bordeaux, FR;
Laurent Bignolles, Bordeaux, FR;
Thomson-CSF Sextant, Velizy Villacoublay, FR;
Abstract
The present invention relates to a display device with a liquid-crystal cell comprising a twisted nematic liquid-crystal layer ( ) placed between two crossed polarizers ( ) and comprising, between the liquid-crystal layer and at least one of the polarizers, a structure for compensating for the variations in contrast of the cell according to the angle of observation. This structure comprises at least two superposed negative uniaxial media such that the extraordinary optical axis of one medium ( ) is parallel to the normal to the cell and that of the other medium ( ) is inclined with respect to this normal on the one hand and with respect to the plane of the cell on the other. This compensating structure includes an additional layer ( ) of a positive uniaxial birefringent material.