# US 2017/0285356 A1 · Stereo display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0285356 A1 - Document ID: US20170285356A1 - Status: Published application - Kind: A1 - Application number: 15/210,909 - Filed: 2016-07-15 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Delta Electronics, Inc. - Applicants: Delta Electronics, Inc. - Inventors: June-Jei HUANG - Web page: https://patentgrep.com/patent/US20170285356A1 ## CPC - G02B 30/27: involving lenticular arrays - G02B 3/0068: {arranged in a single integral body or plate, e.g. laminates or hybrid structures with other optical elements (G02B5/1885, G02B17/002, G02B30/27 take precedence)} - G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} - G02B 5/001: {Axicons, waxicons, reflaxicons} - G02B 30/29: characterised by the geometry of the lenticular array, e.g. slanted arrays, irregular arrays or arrays of varying shape or size - G03B 21/606: for relief projection - G03B 21/625: Lenticular translucent screens - G03B 35/20: using two or more projectors - G03B 35/24: using apertured or refractive resolving means on screens or between screen and eye - H04N 13/302: for viewing without the aid of special glasses, i.e. using autostereoscopic displays - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A stereo display device includes plural projectors, a lens array, and a concave axicon lens array. The projectors project images to plural viewing regions at an image side. The lens array is disposed between the projectors and the image side. The concave axicon lens array is disposed between the lens array and the image side. ## Claims ### Claim 1 A stereo display device, comprising: a plurality of projectors configured to project a plurality of different images to a plurality of viewing regions at an image side; a lens array disposed between the projectors and the image side; and a concave axicon lens array disposed between the lens array and the image side. ### Claim 2 (depends on 1) The stereo display device of claim 1, further comprising a substrate disposed between the lens array and the concave axicon lens array, wherein the lens array and the concave axicon lens array are directly disposed on two opposite surfaces of the substrate respectively. ### Claim 3 (depends on 1) The stereo display device of claim 1, wherein the lens array comprises a plurality of lenses, the concave axicon lens array comprises a plurality of axicon lenses, and a center of each of the lenses is substantially aligned with a center of each of the axicon lenses. ### Claim 4 (depends on 3) The stereo display device of claim 3, wherein each of the axicon lenses comprises: a plane surface proximate to the lens array; and a concave conical surface disposed opposite to the plane surface. ### Claim 5 (depends on 1) The stereo display device of claim 1, wherein the lens array comprises: a first lenticular lens; and a second lenticular lens, wherein an extension direction of the first lenticular lens is substantially perpendicular to an extension direction of the second lenticular lens. ### Claim 6 (depends on 5) The stereo display device of claim 5, further comprising a substrate disposed between the first lenticular lens and the concave axicon lens array, wherein the first lenticular lens and the concave axicon lens array are directly disposed on two opposite surfaces of the substrate respectively. ### Claim 7 (depends on 5) The stereo display device of claim 5, wherein a projection of the first lenticular lens and a projection of the second lenticular lens on a plane where the concave axicon lens array located form a plurality of intersection positions, the concave axicon lens array comprises a plurality of axicon lenses, and a center of each of the axicon lenses is substantially aligned with a center of each of the intersection positions. ### Claim 8 (depends on 1) The stereo display device of claim 1, further comprising a substrate disposed between the lens array and the concave axicon lens array, wherein the concave axicon lens array comprises a plurality of axicon lenses, and the axicon lenses are disposed on the substrate uniformly. ### Claim 9 (depends on 1) The stereo display device of claim 1, wherein the lens array is confocal with the concave axicon lens array. ### Claim 10 (depends on 9) The stereo display device of claim 9, wherein the lens array comprises at least one lens, the concave axicon lens array comprises at least one axicon lens, and a focal point of the lens is substantially located on a focal line of the axicon lens. ### Claim 11 (depends on 10) The stereo display device of claim 10, wherein a focal length of the lens array is greater than a focal length of the concave axicon lens array. ### Claim 12 (depends on 1) The stereo display device of claim 1, further comprising a first fresnel lens disposed between the projectors and the lens array. ### Claim 13 (depends on 12) The stereo display device of claim 12, further comprising a second fresnel lens disposed at a side of the concave axicon lens array opposite to the lens array. ### Claim 14 (depends on 1) The stereo display device of claim 1, wherein the projectors are arranged on a first plane, the lens array is disposed on a second plane, and the first plane is substantially parallel with the second plane. ### Claim 15 (depends on 1) The stereo display device of claim 1, further comprising a table, wherein the projectors, the lens array, and the concave axicon lens array are disposed in the table, and the projectors are respectively configured to project the images to the viewing regions out of the table through a surface of the table.