Patent
Light guide for display devices of the head-mounted or head-up type
TLDR
In this article, a light guide for display devices of the head-mounted or head-up type comprises: a body of the light guide (22) at least in part transparent to visible light; a coupling device (24) associated to the body of light guide and designed to couple the body to an optical system (18) designed to generate an image, the coupling device being obtained in such a way that the light beams coming from the optical system(18) enter the body and propagate within the body by total internal reflection; and an image-extraction grating,Abstract:
A light guide for display devices of the head-mounted or head-up type comprises: a body of the light guide (22) at least in part transparent to visible light; a coupling device (24) associated to the body of the light guide (22) and designed to couple the body (22) to an optical system (18) designed to generate an image, the coupling device (24) being obtained in such a way that the light beams coming from the optical system (18) enter the body of the light guide (22) and propagate within the body (22) by total internal reflection; and an image-extraction grating, designed to extract the light beams that propagate in the body of the light guide (22) so as to enable an observer to visualize the extracted image against a background visible in transparency through the body of the light guide (22). The extraction grating (32) is set in the proximity of one of the outer surfaces of the guide and has a saw-tooth profile. The extraction grating (32) is coated with a partially reflecting coating deposited prevalently on the surfaces of the teeth that are least inclined with respect to the surfaces (22) of the guide.read more
Citations
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Patent
Virtual image display apparatus
TL;DR: In this article, an optical-directivity changing section forms a non-uniform distribution concerning the directivity of image lights emitted from an image display device, and it is possible to suppress occurrence of luminance spots to improve efficiency of use of illumination light.
Patent
Optical device, and virtual image display device
Hiroshi Mukawa,Katsuyuki Akutsu +1 more
TL;DR: In this article, a virtual image display device with an optical waveguide to guide, by internal total reflection, parallel pencil groups meeting a condition of internal total reflections was presented. But the authors did not specify the conditions of the external reflection.
Patent
Transparent waveguide display
Robert D. Brown,Alastair John Grant,Wyatt L. Hendrick,Milan Momcilo Popovich,James H. Stanley,Jonathan David Waldern +5 more
TL;DR: In this article, a first optical substrate comprising at least one waveguide layer configured to propagate light in a first direction, and a second optical substrate consisting of at least two waveguide layers in a second direction.
Patent
Ergonomic head mounted display device and optical system
Chunyu Gao,Hong Hua,Yuxiang Lin +2 more
TL;DR: In this article, an ergonomic optical see-through head mounted display device with an eyeglass appearance is presented, which consists of a transparent, free-form waveguide prism for viewing a displayed virtual image, a seethrough compensation lens for enabling proper viewing of a real-world scene when combined together with the prism, and a miniature image display unit for supplying display content.
Patent
Virtual image display device
TL;DR: In this article, a virtual image display device has a light guide device in which the half mirror layer (the semi-transmissive reflecting film) of the light guide member is formed on the partial area of the first junction surface.
References
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Patent
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