Invention Grant
- Patent Title: Foveated near to eye display system using a computational freeform lens via spatial light modulation of a laser projected image onto an emissive film
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Application No.: US16021661Application Date: 2018-06-28
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Publication No.: US10764547B2Publication Date: 2020-09-01
- Inventor: Jeffrey R. Stafford
- Applicant: Sony Interactive Entertainment Inc.
- Applicant Address: JP Tokyo
- Assignee: Sony Interactive Entertainment Inc.
- Current Assignee: Sony Interactive Entertainment Inc.
- Current Assignee Address: JP Tokyo
- Agent John L. Rogitz
- Main IPC: H04N9/31
- IPC: H04N9/31 ; G09G3/00 ; G02B3/08 ; G02B5/18

Abstract:
A projection system projects images onto a projection surface in, for example, a computer game head-mounted display (HMD). The light is projected through a spatial light modulator that is combined with a Freeform Fourier Lens that is a combination of a Fresnel lens, an X-phase grating, a Y-phase grating, and a radial grating. The freeform lens causes the gradual shrinking of portions of the laser-projected image, decreasing the perceived pixel pitch in at least one foveal area on the projection surface compared to a non-modulated laser image. The center positions of the Fresnel lens and radial grating can be changed in the X and Y axes, moving the condensed foveal areas in accordance with eye tracking of the user. In effect, the system projects a Foveated image that contains variable pixel pitch such that a user perceives a higher visual acuity in his gaze direction.
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