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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.:

US 11860526 B1

PDFFull Text
Date of Patent:
Jan. 02, 2024

Filed:

Jun. 05, 2020

Beam modulation apparatus and projection system

Applicant:

Beijing Asu Tech Co. Ltd., Beijing, CN;

Inventors:

Jinwang Zhang, Beijing, CN;

Teng Cao, Beijing, CN;

Wei-Chih Lin, Beijing, CN;

Xianlu Wang, Beijing, CN;

Zhigang Liu, Beijing, CN;

Assignee:

BEIJING ASU TECH CO. LTD., Beijing, CN;

Attorneys:

PATTAO, LLC

Junjie Feng

Primary Examiner:

Ryan D Howard

Int. Cl.
CPC ...
G03B 21/00 (2006.01); H04N 9/31 (2006.01); G03B 21/20 (2006.01); G02B 3/04 (2006.01); G02B 5/02 (2006.01); G02B 5/26 (2006.01); G02B 5/30 (2006.01); G02B 26/00 (2006.01); G02B 27/09 (2006.01); G02B 27/28 (2006.01); G02B 27/30 (2006.01); G02B 27/48 (2006.01); G02F 1/01 (2006.01); G02F 1/1362 (2006.01);
U.S. Cl.
CPC ...
G03B 21/2073 (2013.01); G02B 3/04 (2013.01); G02B 5/0205 (2013.01); G02B 5/0278 (2013.01); G02B 5/26 (2013.01); G02B 5/3083 (2013.01); G02B 26/008 (2013.01); G02B 27/0922 (2013.01); G02B 27/0927 (2013.01); G02B 27/0938 (2013.01); G02B 27/283 (2013.01); G02B 27/286 (2013.01); G02B 27/30 (2013.01); G02B 27/48 (2013.01); G02F 1/0136 (2013.01); G02F 1/136277 (2013.01); G03B 21/005 (2013.01); G03B 21/204 (2013.01); G03B 21/208 (2013.01); G03B 21/2013 (2013.01); G03B 21/2066 (2013.01); G02F 2203/02 (2013.01);
Abstract

Provided include a beam modulation apparatus for modulating an input light field and a projection system containing the apparatus. The input light field has a first light field and a second light field, having a difference of 90° in their polarization states. The apparatus includes a PBS prism, a first LCOS panel and a second LCOS panel. The first and the second LCOS panel are respectively over a side surface of the PBS prism opposing to an optical incident surface and an optical exit surface. Each LCOS panel comprises a plurality of pixels over a reflective surface thereof, with each pixel controllably switched on or off such that a polarity state of a light beam reflected by a portion of the reflective surface corresponding thereto is changed or remains unchanged. This beam modulation apparatus can be applied in a projection system, such as a laser TV projection system.

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