# US 5,703,702 A · Holographic synthesis > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,702 A - Document ID: US5703702A - Status: Granted - Kind: A - Application number: 08/117,708 - Filed: 1993-09-08 - Granted: 1997-12-30 - Earliest claimed: 1993-09-08 - Inventors: Patrick E. Crane; Ronnie C. Lau - Web page: https://patentgrep.com/patent/US5703702A ## CPC - G03H 1/08: Synthesising holograms, {i.e. holograms synthesized from objects or objects from holograms}(using electric digital computers G06F; G06T) - 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}) ## Abstract A tight packed array of amplitude controlled in-phase light emitters produces dynamic real holographic images. A partially reflecting mirror is applied to a planar array of amplitude controlled laser diode emitters which are stimulated by each other. The emitters are forced into phase with each other by partially reflecting light energy from adjacent row and column elements onto each other. Incident energy stimulates the element receiving the energy to fire in phase with the incident energy. The array may be forced in phase by directly illumination from a master laser. A single laser is used to illuminate a flat surface containing an array of transmissive apertures which act as emitters. Amplitudes are controlled by liquid crystals. Light from the emitters forms an image which changes according to amplitudes of the individual emitters. Optical focal plane reducers reduce the effective inter element spacing. ## Claims ### Claim 1 Apparatus for generating holograms comprising an array of individual controlled energy-emitting elements, an exciter spaced from the elements for in-phase exciting of the elements for emitting an overall holographic image from combined individual in-phase energies emitted by the individually controlled energy-emitting elements. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the elements are light emitting diodes and the energy is light. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the exciter comprises a partially reflecting mirror. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the exciter comprises a master laser for firing the elements in phase. ### Claim 5 Apparatus for generating holograms comprising an array of individually controlled energy-emitting elements, an exciter for in-phase exciting of the elements for emitting an overall holographic image from in-phase energy emitted by the individually controlled elements, wherein the exciter further comprises a partially reflecting mirror for reflecting energy from the elements to adjacent elements for stimulating the adjacent elements. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the elements are arranged in rows and columns for partially reflecting energy from the elements onto adjacent elements in adjacent rows and columns for stimulating the adjacent elements. ### Claim 7 (depends on 5) The apparatus of claim 5, wherein the elements are spaced on a substrate, and wherein the mirror is held at an adjustable distance from the elements for partially reflecting energy to adjacent elements. ### Claim 8 (depends on 5) The apparatus of claim 5, wherein the exciter comprises a precisely controlled thickness of a dielectric material, having an exit surface facing away from the elements, and wherein the exit surface is partially reflective for reflecting energy back to excite adjacent elements. ### Claim 9 Apparatus for generating holograms comprising an array of individually controlled energy-emitting elements, an exciter for in-phase exciting of the elements for emitting an overall holographic image from in-phase energy emitted by the individually controlled elements, wherein the elements are tightly packed and each element produces less than about 0.1 mW of power. ### Claim 10 Apparatus for generating holograms comprising an array of individually controlled energy-emitting elements, an exciter for in-phase exciting of the elements for emitting an overall holographic image from the in-phase energy emitted by the individually controlled elements, wherein the elements are small apertures in a surface and the energy is light. ### Claim 11 (depends on 10) The apparatus of claim 10, further comprising a liquid crystal plate overlying the apertures for controlling amplitudes from the apertures. ### Claim 12 Image apparatus for generating a hologram comprising a dense array of individually amplitude-controlled emitters for providing light, an exciter spaced from the emitters for in-phase stimulation of the emitters for emitting an overall holographic image, the exciter comprising an optical element for exciting at least some of the emitters. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the elements are positioned in a non planar array. ### Claim 14 Apparatus for generating holograms comprising a dense array of individually amplitude-controlled emitters for providing light, an exciter for in-phase stimulation of the emitters for emitting and overall holographic image, the exciter comprising an optical element for exciting at least some of the emitters, wherein amplitude control of individual emitters is accomplished by liquid crystals. ### Claim 15 Apparatus for generating holograms comprising a dense array of individually amplitude-controlled emitters for providing light, an exciter for in-phase stimulation of the emitters for emitting and overall holographic image, the exciter comprising an optical element for exciting at least some of the emitters, wherein the emitters are apertures, and wherein the optical element comprises a master laser for stimulating light emission by the apertures. ### Claim 16 A method of generating holograms for creating holographic images, comprising providing an array of individual light emitters, individually controlling light intensity from the emitters, and exciting said light emitters with in-phase light energy for releasing energy from the emitters in-phase to form holographic images. ### Claim 17 (depends on 16) The method of claim 16, further comprising providing a partially reflecting mirror spaced from the emitters, partially reflecting light energy released from the emitters back to adjacent emitters with the partially reflecting mirror for exciting the adjacent emitters. ### Claim 18 (depends on 16) The method of claim 16, further comprising providing an optical focal plane reducers are used to reduce the effective inter element spacing to one wavelength or less of the emitting surface. ### Claim 19 (depends on 16) The method of claim 16, further comprising providing a computer for connecting with the emitters, wherein the process of creating holographic images is controlled by the computer. ### Claim 20 (depends on 16) The method of claim 16, wherein the exciting light emitters comprise using a single laser to illuminate a flat surface containing an array of transmissive apertures which act as emitters.