# US 2014/0192389 A1 · Holographic imaging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192389 A1 - Document ID: US20140192389A1 - Status: Published application - Kind: A1 - Application number: 13/881,731 - Filed: 2012-08-23 - Published: 2014-07-10 - Earliest claimed: 2012-08-23 - Assignees: Empire Technology Development LLC - Inventors: Eiji Yamaichi - Web page: https://patentgrep.com/patent/US20140192389A1 ## CPC - G03H 1/2205: {using downstream optical component} - G03H 1/2202: {Reconstruction geometries or arrangements} - G03H 1/2286: {Particular reconstruction light (G03H1/24 takes precedence); Beam properties} - G03H 1/2294: {Addressing the hologram to an active spatial light modulator} - H04N 9/12: Picture reproducers (H04N9/11 takes precedence) - H10H 20/013: {having light-emitting regions comprising only Group III-V materials} - G03H 2001/2226: {Edge lit holograms} - G03H 2001/2234: {Transmission reconstruction} - G03H 2223/16: Optical waveguide, e.g. optical fibre, rod - G03H 2227/06: Support including light source - G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00}) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract Technologies are generally described for generating an image in a holographic imaging device by causing multiple reflections of a hologram reconstruction light on one side of a display panel in the holographic imaging device. An example device may include a display panel, a semi-transparent mirror layer on the display panel, a mirror layer at a side of the semi-transparent mirror layer opposite to the display panel, and a light irradiation unit opposite to the semi-transparent mirror layer. The light irradiation unit may irradiate a hologram reconstruction light on the semi-transparent mirror layer at a predetermined incident angle. The semi-transparent mirror layer may reflect a portion of the hologram reconstruction light such that the reflected portion of the hologram reconstruction light may be incident on the mirror layer. The semi-transparent mirror layer may transmit the other portion of the hologram reconstruction light to cause interference in the hologram. ## Claims ### Claim 1 A holographic imaging device, comprising: a display panel configured to display a hologram; a semi-transparent mirror layer disposed on the display panel; a mirror layer disposed at a side of the semi-transparent mirror layer opposite to the display panel; and a light irradiation unit configured to irradiate a hologram reconstruction light to be incident on a side of the semi-transparent mirror layer opposite to the display panel at a predetermined incident angle, wherein the semi-transparent mirror layer is configured to reflect a portion of the hologram reconstruction light such that the reflected portion of the hologram reconstruction light is incident on the mirror layer, and the semi-transparent mirror layer is configured to transmit the other portion of the hologram reconstruction light effective to cause interference in the hologram displayed in the display panel. ### Claim 2 (depends on 1) The holographic imaging device of claim 1, wherein the light irradiation unit includes at least one laser beam source. ### Claim 3 (depends on 1) The holographic imaging device of claim 1, wherein the display panel includes a liquid crystal display panel. ### Claim 4 (depends on 1) The holographic imaging device of claim 1, wherein the mirror layer includes an aluminum film coated on a glass layer. ### Claim 5 (depends on 1) The holographic imaging device of claim 1, wherein the mirror layer includes a silicon dioxide film formed on a silicon layer. ### Claim 6 (depends on 1) The holographic imaging device of claim 1, wherein the semi-transparent mirror layer includes an aluminum film coated on a glass layer. ### Claim 7 (depends on 1) The holographic imaging device of claim 1, wherein the semi-transparent mirror layer includes an aluminum film coated on the display panel. ### Claim 8 (depends on 1) The holographic imaging device of claim 1, wherein the mirror layer is spaced apart from the semi-transparent mirror layer by a predetermined gap. ### Claim 9 (depends on 8) The holographic imaging device of claim 8, wherein the gap between the mirror layer and the semi-transparent mirror layer is filled with air. ### Claim 10 (depends on 8) The holographic imaging device of claim 8, wherein the gap between the mirror layer and the semi-transparent mirror layer is filled with quartz glass. ### Claim 11 (depends on 8) The holographic imaging device of claim 8, wherein the incident angle of the hologram reconstruction light is adjusted such that an optical path length of the hologram reconstruction light in the gap is an integer multiple of a wavelength of the hologram reconstruction light. ### Claim 12 (depends on 1) The holographic imaging device of claim 1, wherein the semi-transparent mirror layer is made of quartz glass, wherein a side of the display panel facing the semi-transparent mirror layer includes a glass layer, and wherein a refractive index of the semi-transparent mirror layer is greater than a refractive index of the glass layer of the display panel. ### Claim 13 (depends on 12) The holographic imaging device of claim 12, wherein the incident angle of the hologram reconstruction light is selected to prevent a total reflection of the hologram reconstruction light between the semi-transparent mirror layer and the glass layer of the display panel. ### Claim 14 (depends on 1) The holographic imaging device of claim 1, wherein the semi-transparent mirror layer is doped with rare-earth material. ### Claim 15 A method for generating an image in a holographic imaging device including a display panel configured to display a hologram, a semi-transparent mirror layer disposed on the display panel, and a mirror layer disposed at a side of the semi-transparent mirror layer opposite to the display panel, the method comprising: irradiating, by a light irradiation unit, a hologram reconstruction light on a side of the semi-transparent mirror layer opposite to the display panel at a predetermined incident angle; reflecting a portion of the hologram reconstruction light on the semi-transparent mirror layer such that the reflected portion of the hologram reconstruction light is incident on the mirror layer; and transmitting another portion of the hologram reconstruction light through the semi-transparent mirror layer effective to cause interference in the hologram displayed in the display panel. ### Claim 16 (depends on 15) The method of claim 15, further comprising: adjusting, by the light irradiation unit, the incident angle of the hologram reconstruction light such that an optical path length of the hologram reconstruction light in the predetermined gap is an integer multiple of a wavelength of the hologram reconstruction light. ### Claim 17 (depends on 15) The method of claim 15, further comprising: adjusting, by the light irradiation unit, the incident angle of the hologram reconstruction light effective to prevent a total reflection of the hologram reconstruction light between the semi-transparent mirror layer and a side of the display panel, wherein the side of the display panel includes a material with a refractive index less than a refractive index of the semi-transparent mirror layer. ### Claim 18 A method for fabricating a holographic imaging device, comprising: forming a mirror layer; forming a groove pattern into the mirror layer; forming a laser structure on the groove pattern; forming a semi-transparent mirror layer on the mirror layer; and forming a display panel on the semi-transparent mirror layer. ### Claim 19 (depends on 18) The method of claim 18, wherein forming the groove pattern comprises etching the groove pattern. ### Claim 20 (depends on 18) The method of claim 18, wherein forming the laser structure comprises: forming a layer of GaAs or GaN on the groove pattern; and forming a laser structure of AlGaAs or GaN. ### Claim 21 (depends on 18) The method of claim 18, wherein forming the display panel comprises forming a liquid crystal display panel. ### Claim 22 (depends on 18) The method of claim 18, wherein forming the mirror layer comprises coating an aluminum film on a glass layer. ### Claim 23 (depends on 18) The method of claim 18, wherein forming the mirror layer comprises forming a silicon dioxide film on a silicon layer. ### Claim 24 (depends on 18) The method of claim 18, wherein forming the semi-transparent mirror layer comprises coating an aluminum film coated on a glass layer. ### Claim 25 (depends on 18) The method of claim 18, wherein forming the semi-transparent mirror layer comprises coating an aluminum film on the display panel. ### Claim 26 (depends on 18) The method of claim 18, wherein forming the semi-transparent mirror layer includes: forming a support pillar on the mirror layer; and forming the semi-transparent mirror layer on the support pillar such that the mirror layer is spaced apart from the semi-transparent mirror layer by a predetermined gap.