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:
Sep. 12, 2006
Filed:
Sep. 13, 2002
John M. Shannon, Whyteleafe, GB;
Ian D. French, Hove, GB;
Jeremy N. Sandoe, Horsham, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A color display device based on dielectrophoresis is described. The device includes a dielectrophoretic mixture comprising semi-insulating particles of each of the subtractive primary colors cyan (), magenta () and yellow () in a semi-insulating liquid (). The dielectrophoretic frequency characteristics of the particles are the same or similar for particles of the same color but different between the three colors. In particular, the transition frequency (f) is different for each color, or two colors may have the same transition frequency (f) if one has a reversed sense dielectrophoretic frequency characteristic. Also the speeds of the particles are the same for particles of the same color but different between the three colors. The pixels are driven with alternating voltages of different frequencies (f, f, f, f) and duration determined such that different proportions of the different colors of particles are moved, dependent upon their transition frequencies and speeds. A reflective, saturated full color display device may thereby be provided.