# US 2021/0239883 A1 · Head Mounted Display Device with Double Faceted Optics > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0239883 A1 - Document ID: US20210239883A1 - Status: Published application - Kind: A1 - Application number: 17/103,693 - Filed: 2020-11-24 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: Microsoft Technology Licensing, LLC - Applicants: Microsoft Technology Licensing, LLC - Inventors: Andreas GEORGIOU; Alfonsus D. LUNARDHI; Joel Steven KOLLIN; Bernard C. KRESS; Ishan CHATTERJEE; Mario POSSIWAN; Charles Thomas HEWITT; Brian K. GUENTER; Maria PACE; Jacob HADNETT-HUNTER - Web page: https://patentgrep.com/patent/US20210239883A1 ## CPC - G02B 3/0056: {arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085)} - G02B 27/0172: {characterised by optical features} - G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} - G02B 7/021: {for more than one lens} - G02B 2027/0187: {slaved to motion of at least a part of the body of the user, e.g. head, eye} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract This document relates to head mounted display devices. In one example the head mounted display device includes a light engine including an array of individually controllable pixels that can be energized to emit light. The example also includes an optical assembly physically aligned with the light engine and including a set of focusing elements facing toward the light engine and a different set of focusing elements facing away from the light engine. ## Claims ### Claim 1 A head mounted display device, comprising: a light engine configured to generate light corresponding to image data; a housing configured to be positioned relative to a head of a user and to position the light engine in front of an eye of the user; and, an optical assembly positioned by the housing between the light engine and the eye, the optical assembly comprising: a first layer of lenses positioned proximate to the light engine; a second layer of lenses positioned on an opposite side of the first layer from the light engine; and, a third layer of lenses positioned on an opposite side of the second layer from the first layer. ### Claim 2 (depends on 1) The head mounted display device of claim 1, wherein each lens of the first layer, the second layer, and the third layer is the same diameter. ### Claim 3 (depends on 1) The head mounted display device of claim 1, wherein each lens of the first layer is the same diameter, each lens of the second layer is the same diameter, and each lens of the third layer is the same diameter, and the diameters of the lenses of the first layer are different from the diameters of at least one of the diameters of the lenses of the second layer or the third layer. ### Claim 4 (depends on 1) The head mounted display device of claim 1, wherein each lens of an individual layer has the same diameter. ### Claim 5 (depends on 1) The head mounted display device of claim 1, wherein individual lenses of an individual layer have different diameters. ### Claim 6 (depends on 1) The head mounted display device of claim 1, further comprising at least a fourth layer of lenses. ### Claim 7 (depends on 6) The head mounted display device of claim 6, wherein lenses of the fourth layer have a diameter that is different than diameters of lenses of the first layer, the second layer, and the third layer. ### Claim 8 (depends on 1) The head mounted display device of claim 1, wherein the lenses of the third layer comprise a single lens. ### Claim 9 (depends on 8) The head mounted display device of claim 8, wherein the single lens has a diameter that is equal to a width of the second layer. ### Claim 10 (depends on 1) The head mounted display device of claim 1, wherein an individual lens of the third layer has a diameter that is equal to a width defined by a whole number of the lenses of the second layer. ### Claim 11 (depends on 10) The head mounted display device of claim 10, wherein an individual lens of the second layer has a diameter that is equal to a width defined by a whole number of the lenses of the first layer. ### Claim 12 (depends on 1) The head mounted display device of claim 1, wherein the first layer, the second layer, and the third layer comprise the same number of lenses. ### Claim 13 (depends on 12) The head mounted display device of claim 12, wherein an overall width of the first layer, the second layer, and the third layer are equal. ### Claim 14 (depends on 12) The head mounted display device of claim 12, wherein an overall width of the third layer is less than an overall width of the second layer and the overall width of the second layer is less than an overall width of the first layer. ### Claim 15 (depends on 12) The head mounted display device of claim 12, wherein individual lenses of the second layer are centered directly over individual lenses of the first layer. ### Claim 16 (depends on 12) The head mounted display device of claim 12, wherein individual lenses of the second layer are shifted toward a center of the second layer relative to underlying individual lenses of the first layer. ### Claim 17 (depends on 16) The head mounted display device of claim 16, wherein individual lenses of the third layer are shifted toward a center of the third layer relative to underlying individual lenses of the second layer. ### Claim 18 A head mounted display device, comprising: a light engine configured to generate light corresponding to image data; a housing having an inwardly facing side and an outwardly facing side, the inwardly facing side configured to be engaged by a head of a user to position the housing relative to an eye of the user; and, an optical assembly positioned by the housing to receive light from the light engine, the optical assembly comprising at least three layers of lenses configured to collectively direct light from the light engine toward an eye box that is positioned to be aligned with the eye of the user. ### Claim 19 (depends on 18) The head mounted display device of claim 18, wherein the light engine and the at least three layers are planar, or wherein the light engine and the at least three layers are curved, or wherein a portion of the light engine and the at least three layers is curved and another portion of the light engine and the at least three layers is planar. ### Claim 20 A head mounted display device, comprising: a light engine comprising an array of individually controllable pixels that can be energized to emit light; and, an optical assembly comprising a first layer of lenses that are physically aligned over the pixels and a second layer of lenses positioned over the first layer and aligned to reduce discontinuities experienced by light emitted by the pixels and refracted by the first and second layers toward an eye box.