# US 10,503,251 B2 · Display system and display method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,503,251 B2 - Document ID: US10503251B2 - Status: Granted - Kind: B2 - Application number: 15/567,416 - Filed: 2017-04-07 - Published: 2018-10-11 - Granted: 2019-12-10 - Earliest claimed: 2016-07-22 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Bingchuan Shi - Web page: https://patentgrep.com/patent/US10503251B2 ## CPC - G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)} - G02B 27/0093: {with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking} - G02B 30/56: by projecting aerial or floating images - G03H 1/02: Details {of features involved during the holographic process; Replication of holograms without interference recording} - G03H 1/2294: {Addressing the hologram to an active spatial light modulator} - G06T 7/0002: {Inspection of images, e.g. flaw detection} - G06T 7/246: using feature-based methods, e.g. the tracking of corners or segments - G06T 7/73: using feature-based methods - H04N 23/56: provided with illuminating means - G02B 27/283: {used for beam splitting or combining} - G03H 2001/0216: {Optical components (G03H2001/0224, G03H1/0256 take precedence; corresponding details, see subgroups of G03H2223/00)} - G03H 2222/13: Multi-wavelengths wave with discontinuous wavelength ranges (G03H2222/18 takes precedence) - G03H 2222/16: Infra Red [IR] - G03H 2222/34: Multiple light sources - G03H 2222/54: Convergent beam - G03H 2223/17: Element having optical power - G03H 2226/05: Means for tracking the observer - G06T 2207/10016: Video; Image sequence - G06T 2207/10048: Infrared image - G06T 2207/30041: Eye; Retina; Ophthalmic - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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}) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract The embodiments of the present invention provide a display system and a display method. The display system includes a projection unit and an eye tracking unit. The projection unit includes a projection light source, a projection lens and a spatial light modulator. The projection lens is located between the projection light source and the spatial light modulator. In a direction of an optical axis of the projection lens, the projection lens includes a first lens portion overlapping with the spatial light modulator and a second lens portion not overlapping with the spatial light modulator. The eye tracking unit includes a camera. An imaging optical path of the camera passes through the second lens portion. The display system and the display method provided by the embodiments of the present invention can be advantageously used in the display field including holographic display, simplifying the optical design, and providing a compact and efficient optical system. ## Claims ### Claim 1 A display system, comprising: a projection unit and an eye tracking unit; wherein the projection unit comprises a projection light source, a projection lens and a spatial light modulator; the projection lens is located between the projection light source and the spatial light modulator; in a direction of an optical axis of the projection lens, the projection lens comprises a first lens portion overlapping with the spatial light modulator and a second lens portion not overlapping with the spatial light modulator; the eye tracking unit comprises a camera; an imaging optical path of the camera passes through the second lens portion; and a paraxial portion of the projection lens serves as the first lens portion thereof, and a peripheral portion of the projection lens serves as the second lens portion thereof. ### Claim 2 (depends on 1) The display system according to claim 1, further comprising a beam splitter located between the projection lens and the projection light source; wherein the beam splitter is configured to reflect light from the second lens portion to the camera. ### Claim 3 (depends on 2) The display system according to claim 2, wherein the beam splitter is a beam splitting plate or a beam splitting prism. ### Claim 4 (depends on 2) The display system according to claim 2, wherein the beam splitter is a polarization splitting prism. ### Claim 5 (depends on 1) The display system according to claim 1, wherein the eye tracking unit further comprises a lighting source; the lighting source is configured to provide illumination to an eye of an observer through the second lens portion. ### Claim 6 (depends on 5) The display system according to claim 5, wherein the lighting source comprises an infrared light source. ### Claim 7 (depends on 1) The display system according to claim 1, wherein the projection lens has only one lens. ### Claim 8 (depends on 1) The display system according to claim 1, wherein the projection lens comprises a plurality of lenses. ### Claim 9 (depends on 1) The display system according to claim 1, wherein the projection lens has a circular shape; the spatial light modulator has a rectangular shape. ### Claim 10 (depends on 1) The display system according to claim 1, wherein the projection light source comprises a laser. ### Claim 11 (depends on 1) The display system according to claim 1, wherein the projection unit further comprises a beam expander, a micro objective lens, a pinhole filter and a rectangular diaphragm sequentially disposed between the projection light source and the projection lens. ### Claim 12 (depends on 1) The display system according to claim 1, wherein the second lens portion is located on the periphery of the first lens portion. ### Claim 13 A display method, comprising: projecting with a projection light source, a projection lens and a spatial light modulator; in a direction of an optical axis of the projection lens, the projection lens comprising a first lens portion overlapping with the spatial light modulator and a second lens portion not overlapping with the spatial light modulator; and performing eye tracking by using a camera, the camera performing imaging with the second lens portion, wherein a paraxial portion of the projection lens serves as the first lens portion thereof, and a peripheral portion of the projection lens serves as the second lens portion thereof. ### Claim 14 (depends on 13) The display method according to claim 13, further comprising: reflecting light from the second lens portion to the camera by using a beam splitter located between the projection lens and the projection light source. ### Claim 15 (depends on 13) The display method according to claim 13, further comprising: providing illumination to an eye of an observer through the second lens portion. ### Claim 16 (depends on 15) The display method according to claim 15, wherein providing illumination to an eye of an observer through the second lens portion comprises: providing infrared illumination to an eye of an observer through the second lens portion. ### Claim 17 (depends on 13) The display method according to claim 13, wherein performing eye tracking by using a camera comprises: determining an azimuth angle of the eye based on a boundary between iris and sclera. ### Claim 18 (depends on 13) The display method according to claim 13, wherein performing eye tracking by using a camera comprises: determining a distance between the eye and the projection lens based on clarity of an eye feature. ### Claim 19 (depends on 13) The display method according to claim 13, wherein the projection unit further comprises a beam expander, a micro objective lens, a pinhole filter and a rectangular diaphragm sequentially disposed between the projection light source and the projection lens. ### Claim 20 (depends on 13) The display method according to claim 13, wherein the second lens portion is located on the periphery of the first lens portion.