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. 26, 2005
Filed:
May. 14, 2003
Hideo Tomita, Tokyo, JP;
Masao Katsumata, Tokyo, JP;
Hideki Yamamoto, Saitama, JP;
Sony Corporation, Tokyo, JP;
Abstract
Provided are an illumination optical system having superior color rendering properties while ensuring sufficient illuminance, an image display apparatus comprising the illumination optical system and a spatial modulation device illuminated by the illumination optical system, and a method of illuminating the spatial modulation device. A first light source (), a second light source () having a different emission spectrum from an emission spectrum of the first light source (), and a replacement optical system replacing light in a specific waveband in a luminous flux (L) from the first light source () with a luminous flux (L) from the second light source () are comprised, and the light in the specific waveband with weak light intensity in the luminous flux (L) from the first light source () is replaced with the luminous flux (L) with sufficient intensity from the second light source (). Thereby, a white balance can be kept without reducing the illuminance more than necessary, and superior color rendering properties can be exhibited.