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. 16, 2010
Filed:
Nov. 26, 2003
Pierre Fagard, Elancourt, FR;
Pierre Fagard, Elancourt, FR;
Thales, Neuilly sur Seine, FR;
Abstract
The invention pertains to a display device comprising means of detection of proximity and to a method of using this device. The device comprises a liquid crystal layer, at least two electrodes making it possible to excite the liquid crystal, means for generating a control signal for the electrodes, means for generating a high frequency signal applied to the second electrode, means for detecting a modification, if any, of the high frequency signal. The device also comprises means of mixing (Rscb) of the high frequency signal and of the control signal. In the method, the means for generating a control signal provide a periodic signal comprising positive and negative alternations and the means for generating a high frequency signal inject a high frequency signal at substantially equal quantity during as many positive alternations as negative alternations of the control signal.