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. 10, 2007
Filed:
Aug. 11, 2003
Jean-louis Lescourret, Merignac, FR;
Serge Ediar, Lege Cap Ferret, FR;
Thomas Espaignet, Cenon, FR;
Thales, Neuilly sur Seine, FR;
Abstract
The invention relates to light boxes comprising fluorescent tubes, which are used to illuminate display screens with optical valves, in particular liquid-crystal matrix screens. More specifically, the invention is suitable for use in the field of head-up or medium-head collimated displays used on aircraft. The invention consists in improving the photometric properties of said light boxes using a novel fluorescent tube arrangement, whereby said tubes are distributed over several stacked layers. In this way, the number of fluorescent tubes present in the light box is increased and acceptable heating is maintained. The photometric performances of the light box are thus increased while the correct service life of the tubes is retained.