ApplicationNo./PatentNo.: 2008 10 167800
The invention relate to an optical system of a light large-field free-form surface prism helmet-mounted display, which belongs to that field of optical system and device design and is suitable for the field of virtual reality and augmented reality. The invention comprises a free-form surface prism with three optical surfaces and a miniature image display, wherein the free-form surface prism is made of plastic glass material with refractive index greater than 1, and the three free-form surface optical surfaces of the free-form surface prism are concave surfaces, which should satisfy one of three curved surface equations, and the positional relationship of each surface should satisfy three conditional equations; The incident angle of the edge light emitted by the LCD on the second free-form surface should meet the total reflection condition, and the image source element is 0.665438. The invention has the advantages of light weight, small volume, good aberration correction, high light energy utilization rate and the like, and can ensure that an observer can see a clear image in a large field of view, and the displayed image has no obvious brightness attenuation and is not easy to cause visual fatigue of the observer.
Date of application: June 8, 2008 +65438.
Open day: February 4, 2009
Date of authorization announcement:
Applicant/patentee: Beijing Institute of Technology.
Applicant's address: No.5 Zhongguancun South Street, Haidian District, Beijing.
Inventor: Cheng; Wang Yongtian; Liu Yue; Chang Jun
Patent institution: Beijing Institute of Technology Patent Center.
Authorized Agent: Zhang Liping.
Patent type: invention patent
Classification number: G02b17/08; g02b 27/00； G02B27/0 1