# US 2014/0192146 A1 · Apparatus and method for displaying hologram image > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192146 A1 - Document ID: US20140192146A1 - Status: Published application - Kind: A1 - Application number: 14/094,704 - Filed: 2013-12-02 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Min Sik PARK; Kyung Ae MOON; Jin Woong KIM - Web page: https://patentgrep.com/patent/US20140192146A1 ## CPC - G03H 1/2294: {Addressing the hologram to an active spatial light modulator} - G03H 1/2286: {Particular reconstruction light (G03H1/24 takes precedence); Beam properties} - G03H 2001/2236: {Details of the viewing window} - G03H 2001/2292: {Using scanning means} - G03H 2226/05: Means for tracking the observer - G03H 2227/03: Means for moving one component (G03H1/0476, G03H2001/2695 take precedence) - H04N 13/383: for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes - 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 ## Abstract Provided is an apparatus and method for displaying a hologram image that may display a hologram image created by tracking a position of a pupil of a user using an acquired user image, tracking a position of a light source of a reflection hologram image that is reflected from appearance of the user, and by correcting a position of a light source of a display hologram image based on the position of the pupil of the user. ## Claims ### Claim 1 An apparatus for displaying a hologram image, the apparatus comprising: an image acquiring unit to acquire a user image; an image analyzer to track a position of a pupil of a user using the user image, and to track a position of a light source of a reflection hologram image that is reflected from appearance of the user; a hologram creator to create a display hologram image corresponding to the position of the pupil of the user; a light source provider to control a position of a light source of the display hologram image based on the position of the pupil of the user; and a hologram display unit to display the display hologram image. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the image acquiring unit comprises: a user image camera to acquire a pupil image of the user; and an infrared (IR) image camera to acquire the reflection hologram image that is created by an IR light that is diffracted from the hologram display unit and thereby reflected. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the user image camera comprises: a three-dimensional (3D) position tracking camera to track a 3D position of the pupil of the user in 3D space. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the image analyzer calculates a mismatching level between a position of a viewing window and the position of the pupil of the user based on the reflection hologram image. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the light source provider controls the position of the light source to match a position of the viewing window. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the image analyzer analyzes a center position error between a center position of the viewing window and a center position of the pupil of the user that is analyzed from the reflection hologram image, and transmits the analyzed center position error to the light source provider. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the light source provider corrects the center position of the viewing window and the center position of the pupil of the user to be matched therebetween based on the center position error. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the image analyzer analyzes a blurring level of the reflection hologram image and transmits the blurring level to the light source provider. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the hologram creator creates the display hologram image using points that are configured by a 3D image acquired at the position of the pupil of the user. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the hologram display unit comprises: a light condensing unit to condense, on the pupil of the user, the light source of which wave front is modulated through the display hologram image. ### Claim 11 A method of displaying a hologram image, the method comprising: acquiring a user image; tracking a position of a pupil of a user using the user image; tracking a position of a light source of a reflection hologram image that is reflected from appearance of the user; creating a display hologram image corresponding to the position of the pupil of the user; controlling a position of a light source of the display hologram image based on the position of the pupil of the user; and displaying the display hologram image. ### Claim 12 (depends on 11) The method of claim 11, wherein the acquiring comprises: acquiring a pupil image of the user; and acquiring the reflection hologram image that is created by an infrared (IR) light that is diffracted and thereby reflected. ### Claim 13 (depends on 12) The method of claim 12, wherein the acquiring of the user image comprises: tracking a three-dimensional (3D) position of the pupil of the user in 3D space. ### Claim 14 (depends on 11) The method of claim 11, further comprising: calculating a mismatching level between a position of a viewing window and the position of the pupil of the user based on the reflection hologram image. ### Claim 15 (depends on 14) The method of claim 14, further comprising: controlling the position of the light source to match a position of the viewing window. ### Claim 16 (depends on 11) The method of claim 11, further comprising: analyzing a center position error between a center position of the viewing window and a center position of the pupil of the user that is analyzed from the reflection hologram image. ### Claim 17 (depends on 16) The method of claim 16, further comprising: correcting the center position of the viewing window and the center position of the pupil of the user to be matched therebetween based on the center position error. ### Claim 18 (depends on 11) The method of claim 11, further comprising: analyzing a blurring level of the reflection hologram image. ### Claim 19 (depends on 11) The method of claim 11, wherein the creating of the display hologram image comprises: creating the display hologram image using points that are configured by a 3D image acquired at the position of the pupil of the user. ### Claim 20 (depends on 11) The method of claim 11, wherein the creating of the display hologram image comprises: condensing, on the pupil of the user, the light source of which wave front is modulated through the display hologram image.