# US 2020/0404226 A1 · Image display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0404226 A1 - Document ID: US20200404226A1 - Status: Published application - Kind: A1 - Application number: 16/979,235 - Filed: 2019-03-08 - Published: 2020-12-24 - Earliest claimed: 2018-03-27 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Masahiro TAKADA; Norihiro OHSE - Web page: https://patentgrep.com/patent/US20200404226A1 ## CPC - H04N 9/317: {Convergence or focusing systems (electronic adjustment of convergence H04N9/3185; convergence or focusing arrangements for cathode ray tubes H04N9/28; means for automatic focusing of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/53)} - G03B 21/60: characterised by the nature of the surface - G03B 37/04: with cameras or projectors providing touching or overlapping fields of view - G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen} - G06F 3/0425: {using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected (tracking a projected light spot to determine a position on a display surface G06F3/0386)} - H04N 9/3147: {Multi-projection systems (video walls G06F3/1446)} - H04N 9/3194: {including sensor feedback} - G06F 2203/04108: Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract An image display device includes M (M≥2) ultra-short focus projectors and reflective directional screens that reflect projection light rays from the corresponding ultra-short focus projectors. The ultra-short focus projectors are arranged above or below the directional screens on which the ultra-short focus projectors are supposed to project images. Adjacent directional screens are tightly arranged. The adjacent directional screens are arranged to form an angle of less than 180 degrees. ## Claims ### Claim 1 An image display device comprising: M (M≥2) ultra-short focus projectors and reflective directional screens that reflect projection light rays from the corresponding ultra-short focus projectors, wherein the ultra-short focus projectors are arranged above or below the directional screens on which the ultra-short focus projectors are supposed to project images, adjacent directional screens are tightly arranged, and the adjacent directional screens are arranged to form an angle of less than 180 degrees. ### Claim 2 (depends on 1) The image display device according to claim 1, wherein each of the directional screens has a curved surface within a range of a depth of focus of a projection lens included in the corresponding ultra-short focus projector. ### Claim 3 (depends on 1) The image display device according to claim 1, further comprising a position detection device that detects a position, with respect to the corresponding directional screen, of an object in contact with a light reflecting surface of the directional screen, or an object close to the light reflecting surface of the directional screen. ### Claim 4 (depends on 1) The image display device according to claim 1, wherein each of the directional screens reflects projection light rays from the corresponding ultra-short focus projector to cause the projection light rays to travel in parallel to each other and in a predetermined direction. ### Claim 5 (depends on 4) The image display device according to claim 4, wherein the predetermined direction is a direction normal to a light reflecting surface of the directional screen. ### Claim 6 (depends on 4) The image display device according to claim 4, wherein a light reflecting surface of the directional screen has a Fresnel shape in which arc-shaped projections and depressions having a predetermined width are arranged concentrically. ### Claim 7 (depends on 6) The image display device according to claim 6, wherein the light reflecting surface of the directional screen does not include an optical center of the Fresnel shape. ### Claim 8 (depends on 6) The image display device according to claim 6, wherein the ultra-short focus projector has an image emitting unit located at an optical center of the Fresnel shape. ### Claim 9 (depends on 4) The image display device according to claim 4, comprising M′ (M′≥3) ultra-short focus projectors and directional screens that display images from the corresponding ultra-short focus projectors, wherein at least two of the M′ directional screens are arranged to face each other in parallel. ### Claim 10 (depends on 9) The image display device according to claim 9, wherein when projection light rays reflected by a first of the directional screens arranged to face each other in parallel collide with a second directional screen, the projection light rays reflected by the second directional screen do not travel toward the first directional screen. ### Claim 11 (depends on 1) The image display device according to claim 1, wherein an image projected across adjacent directional screens is projected continuously on the adjacent directional screens. ### Claim 12 (depends on 11) The image display device according to claim 11, wherein the image projected across the adjacent directional screens is projected in a state of being enlarged in a horizontal direction. ### Claim 13 (depends on 1) The image display device according to claim 1, wherein images are projected on the directional screens in a state in which a degree of enlargement in a horizontal direction is greater as a position is closer to a horizontal edge of each directional screen.