Invention Grant
- Patent Title: Methods and apparatus for light field projection
- Patent Title (中): 光场投影的方法和装置
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Application No.: US14248539Application Date: 2014-04-09
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Publication No.: US09405124B2Publication Date: 2016-08-02
- Inventor: Matthew Hirsch , Gordon Wetzstein , Ramesh Raskar , Vincent Lee
- Applicant: Matthew Hirsch , Gordon Wetzstein , Ramesh Raskar , Vincent Lee
- Applicant Address: US MA Cambridge
- Assignee: Massachusetts Institute of Technology
- Current Assignee: Massachusetts Institute of Technology
- Current Assignee Address: US MA Cambridge
- Agent Stephen R. Otis
- Main IPC: G03B21/00
- IPC: G03B21/00 ; G02B27/22 ; H04N5/74 ; G02B3/00 ; H04N13/04

Abstract:
In exemplary implementations of this invention, light from a light field projector is transmitted through an angle-expanding screen to create a glasses-free, 3D display. The display can be horizontal-only parallax or full parallax. In the former case, a vertical diffuser may positioned in the optical stack. The angle-expanding screen may comprise two planar arrays of optical elements (e.g., lenslets or lenticules) separated from each other by the sum of their focal distances. Alternatively, a light field projector may project light rays through a focusing lens onto a diffuse, transmissive screen. In this alternative approach, the light field projector may comprise two spatial light modulators (SLMs). A focused image of the first SLM, and a slightly blurred image of the second SLM, are optically combined on the diffuser, creating a combined image that has a higher spatial resolution and a higher dynamic range than either of two SLMs.
Public/Granted literature
- US20140300869A1 Methods and Apparatus for Light Field Projection Public/Granted day:2014-10-09
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