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US 10,539,798 B2Granted
Optics of wearable display devices
AssigneesFusao Ishii, DOCOMO Incorporated
InventorsFusao Ishii, Yuji Aburakawa, Kazuhiko Takahashi, Keiichi Murakami, Mikiko Nakanishi
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Abstract
A see-through image display system with high resolution up to 4K, wide field of view (FOV) beyond 60 degrees and small form factor is proposed. The optics for the display incorporates optical elements including hologram, DOE, lens and mirror with free form surfaces. This display system is suitable for a wearable display.
Claims13
A see-through display system comprising:
- a light source controlled by the see through display system for emitting light beams for generating a virtual image;
- a see-through optical element selected from a group of optical elements consist of a holographic optical element (HOE) and a diffractive optical element (DOE) wherein the see-through optical element is disposed in front of eyeballs of a viewer;
- a projection optics having at least one mirror and at least one lens with at least one lens having a free form surface;
- and wherein said projection optics guides and projects light beams from said light source toward said see-through optical element wherein a focal length of the see-through optical element is substantially a distance between the see-through optical element and a center of the eyeballs of the viewer.
1 more element
Dependencies are inferred from the claim text.