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:
Jun. 30, 2009
Filed:
Sep. 24, 2007
Yuji Nakatsugawa, Matsudo, JP;
Yuji Nakatsugawa, Matsudo, JP;
Dai Nippon Printing, Tokyo, JP;
Abstract
The invention provides a retardation control element capable of inhibiting a retardation defect that becomes a cause of light leakage and color shift of a liquid crystal display device from occurring, a method of producing the same, and a liquid crystal display device including such a retardation control element. A method of producing a retardation control element includes: a first step of filtering liquid crystal ink containing crosslinkable liquid crystal molecules with a filter material having a maximum pore diameter in the range of 0.1 to 5 μm; a second step of coating the filtered liquid crystal ink in a thin film on a revolving light-transmitting base material by means of a spin coating method; a third step of, after drying the base material under reduced pressure as needs arise, heating the coated liquid crystal ink to a liquid crystal phase temperature to align the crosslinkable liquid crystal molecules; and a fourth step of photo-polymerizing the aligned crosslinkable liquid crystal molecules each other to form a birefringence functional layer, wherein the second step is carried out with the base material covered with a tight cover.