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:
Dec. 14, 2004
Filed:
Jan. 15, 2003
Applicant:
Inventor:
Ho Joong Kang, Eujeongboo-si, KR;
Assignee:
LG Electronics Inc., Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 2/714 ;
U.S. Cl.
CPC ...
G02B 2/714 ;
Abstract
There is provided a projection display apparatus using a polarization beam splitter having two splitting surfaces, which can simplify its structure and reduce its cost. The projection display apparatus includes the polarization beam splitter that has a first splitting surface for transmitting or reflecting a red light and a second splitting surface for transmitting or reflecting a green light and a blue light. A polarization state converter that is provided in the polarization beam splitter converts the polarization states of the green and blue lights and applies the converted green and blue lights to the polarization beam splitter.