# US 2017/0285349 A1 · Field of view enhancement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0285349 A1 - Document ID: US20170285349A1 - Status: Published application - Kind: A1 - Application number: 15/479,272 - Filed: 2017-04-04 - Published: 2017-10-05 - Earliest claimed: 2016-04-04 - Assignees: Akonia Holographics LLC - Applicants: Akonia Holographics LLC - Inventors: Mark R. Ayres; Adam Urness - Web page: https://patentgrep.com/patent/US20170285349A1 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 5/18: Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} - H04N 1/4092: {Edge or detail enhancement} - H04N 1/58: Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction (H04N1/62 takes precedence) - G02B 5/32: Holograms used as optical elements - G02B 2027/011: {comprising device for correcting geometrical aberrations, distortion} - G02B 2027/0174: {holographic} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An optical reflective device for reflecting light including a grating medium having a first and second grating structure is disclosed. The first grating structure may be configured to reflect light of a wavelength about a first reflective axis offset from a surface normal of the grating medium at a first incidence angle. The second grating structure may be configured to reflect light of the wavelength about a second reflective axis offset from the surface normal of the grating medium at a second incidence angle different from the first incidence angle. The second reflective axis may be different from the first reflective axis. ## Claims ### Claim 1 A device for reflecting light, comprising: a grating medium; a first grating structure within the grating medium, the first grating structure being configured to reflect light of a wavelength about a first reflective axis offset from a surface normal of the grating medium at a first incidence angle; and a second grating structure within the grating medium, the second grating structure being configured to reflect light of the wavelength about a second reflective axis offset from the surface normal of the grating medium at a second incidence angle different from the first incidence angle, the second reflective axis being different from the first reflective axis. ### Claim 2 (depends on 1) The device of claim 1, wherein: the first incidence angle and the second incidence angle differ by at least 5°. ### Claim 3 (depends on 1) The device of claim 1, wherein: the second incidence angle is greater than the first incidence angle. ### Claim 4 (depends on 1) The device of claim 1, further comprising: a third grating structure within the grating medium, the third grating structure including a plurality of grating vectors, each of the plurality of grating vectors having a grating angle that covaries with a grating frequency associated with the third grating structure. ### Claim 5 (depends on 4) The device of claim 4, wherein: the third grating structure is configured to reflect light of the wavelength such that an incidence angle change of a first angular value between consecutive incidence angles associated with the plurality of grating vectors results in a reflective angle change of a scaling factor multiplied by the first angular value between corresponding reflective angles associated with the consecutive respective incidence angles. ### Claim 6 (depends on 4) The device of claim 4, wherein: each grating vector of the plurality of grating vectors of the third grating structure corresponds to a respective incidence angle. ### Claim 7 (depends on 6) The device of claim 6, wherein: the third grating structure is configured to reflect light of the wavelength about a reflective axis corresponding to a respective grating vector at the respective incidence angle. ### Claim 8 (depends on 6) The device of claim 6, wherein: the respective incidence angle for each grating vector has a value between 65° and 77° with respect to the grating medium. ### Claim 9 (depends on 1) The device of claim 1, wherein: the first grating structure is further configured to reflect light of the wavelength about the first reflective axis offset from the surface normal of the grating medium at a first range of incidence angles including the first incidence angle, and wherein each incidence angle of the first range of incidence angles is less than the second incidence angle. ### Claim 10 (depends on 9) The device of claim 9, wherein: the first grating structure comprises at least three holograms, each of the at least three holograms corresponding to a unique incidence angle within the first range of incidence angles, and wherein a grating vector for each of the at least three holograms is a same value. ### Claim 11 (depends on 9) The device of claim 9, wherein: the first grating structure comprises at least three holograms, each of the at least three holograms corresponding to a unique incidence angle within the first range of incidence angles, and wherein an adjacent |ΔKG| for the at least three holograms has a mean value that resides between 1.0×104 and 1.0×106 radians per meter (rad/m). ### Claim 12 (depends on 1) The device of claim 1, further comprising: at least one of the first grating structure or the second grating structure comprises a hologram. ### Claim 13 (depends on 1) The device of claim 1, further comprising: at least one of the first grating structure or the second grating structure comprises a sinusoidal volume grating. ### Claim 14 (depends on 1) The device of claim 1, wherein: the wavelength comprises one of: a visible red light wavelength, a visible blue light wavelength, or a visible green light wavelength. ### Claim 15 (depends on 1) The device of claim 1, wherein: the first grating structure is further configured to reflect light of a plurality of wavelengths at the first incidence angle and the second grating structure is further configured to reflect light of the plurality of wavelengths at the second incidence angle; and the second grating structure is at least partially non-overlapping with the first grating structure. ### Claim 16 (depends on 1) The device of claim 1, further comprising: a second grating medium disposed in a waveguide different from a waveguide in which the grating medium is disposed; a fourth grating structure within the second grating medium, the fourth grating structure being configured to reflect light of a second wavelength different from the wavelength about a fourth reflective axis offset from the surface normal of the second grating medium at the first incidence angle, the fourth reflective axis being substantially parallel to the first reflective axis; and a fifth grating structure within the second grating medium, the fifth grating structure being configured to reflect light of the second wavelength about a fifth reflective axis offset from the surface normal of the second grating medium at the second incidence angle, the fifth reflective axis being substantially parallel to the second reflective axis. ### Claim 17 A head mounted display device, comprising: a light source for providing image-bearing light; an optical lens comprising; a light input section of the optical lens for receiving the image-bearing light, and; a grating medium disposed within the optical lens operatively coupled to the light input section; and; and a pre-distortion manager for applying a blur kernel to a pixel proximal to an edge of a field of view for associated with an image of the image-bearing light. ### Claim 18 (depends on 17) The head mounted display device of claim 17, further comprising: a periphery light source proximal to an edge of the optical lens; and a light projection manager for controlling the periphery light source. ### Claim 19 A method for reflecting light, comprising: reflecting, by a first grating structure within a grating medium, at least a first portion of light of a wavelength incident upon the grating medium at a first incidence angle about a first reflective axis offset from a surface normal of the grating medium; and reflecting, by a second grating structure within the grating medium, at least a second portion of the light of the wavelength incident upon the grating medium at a second incidence angle about a second reflective axis offset from the surface normal of the grating medium, the second incidence angle being different from the first incidence angle and the second reflective axis being different from the first reflective axis. ### Claim 20 (depends on 19) The method of claim 19, further comprising: reflecting, by a third grating structure within the grating medium and including a plurality of grating vectors, at least a third portion of light of the wavelength such that an incidence angle change of a first angular value between consecutive incidence angles associated with the plurality of grating vectors results in a reflective angle change of a scaling factor multiplied by the first angular value between corresponding reflective angles associated with the consecutive respective incidence angles.