# US 2011/0216383 A1 · Holographic color display

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2011/0216383 A1
- Document ID: US20110216383A1
- Status: Published application
- Kind: A1
- Application number: 13/128,484
- Filed: 2009-11-10
- Published: 2011-09-08
- Earliest claimed: 2008-11-10
- Assignees: SeeReal Technologies S.A.
- Inventors: Ralf Haussler
- Web page: https://patentgrep.com/patent/US20110216383A1

## CPC

- G03H 1/2294: {Addressing the hologram to an active spatial light modulator}
- G02B 30/27: involving lenticular arrays
- G02B 30/36: using refractive optical elements, e.g. prisms, in the optical path between the images and the observer
- H04N 13/305: using lenticular lenses, e.g. arrangements of cylindrical lenses
- H04N 13/32: using arrays of controllable light sources; using moving apertures or moving light sources
- H04N 13/324: Colour aspects
- G03H 2001/2242: {Multiple viewing windows}
- G03H 2001/2271: {RGB holobject}
- G03H 2225/55: Having optical element registered to each pixel
- 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})
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Disclosed is a color filter with parallel, vertical color strips of the RGB base colors associated with the image separating means, the color strips repeating horizontally within the color filter in periodic fashion. The light modulator contains a sequence of two registered holograms for each base color interlaced into six pixel columns for a left observer eye and for a right observer eye, and the sequence is repeated horizontally in periodic fashion. The periods of the color filter and the hologram are arranged relative to one another with the same degree of expansion, with a color strip and at least two pixel columns with holograms of the base color of the color strip are associated with a separating element.

## Claims

### Claim 1

Holographic colour display device comprising, in an optical path: light source means, focussing optical means, a controllable light modulator, and an optical image separation means with vertical separating elements, where the focussing optical means image sufficiently coherent light through controllable pixels of the controllable light modulator into an observer plane, said controllable pixels are arranged in the form of a matrix, and where the light is superposed to form visibility regions for observer eyes, and where the vertical separating elements of the optical image separation means image pixel columns in which holograms are encoded into the respective visibility regions for each observer eye in synchronism with that, wherein
The image separation means is assigned with an external colour filter whose material comprises parallel vertical colour stripes of the primary colours RGB which are periodically repeated in the horizontal direction in the colour filter,
The light modulator comprises a sequence of two inscribed holograms for each primary colour which are interleaved for a left and a right observer eye in six pixel columns, where the sequence of the holograms is periodically repeated in the horizontal direction in the light modulator, and
The periods of the colour filters and of the holograms have an identical size and are arranged in relation to each other such that each separating element is assigned with one colour stripe of the colour filter and at least two pixel columns with holograms of the primary colour of that colour stripe, in order to generate multi-coloured visibility regions.

### Claim 2 (depends on 1)

Holographic display device according to claim 1, wherein the pixel columns which are assigned to a colour stripe of the primary colour comprise a hologram which has been computed for that primary colour.

### Claim 3 (depends on 2)

Holographic display device according to claim 2, wherein one visibility region contains the superposed coloured images of all pixel columns for the left observer eye, and the other visibility region contains the superposed coloured images of all pixel columns for the right observer eye, thus holographically generating a multi-coloured three-dimensional object for the observer eyes.

### Claim 4 (depends on 1)

Holographic display device according to claim 1, wherein a horizontal tracking of the multi-coloured visibility regions is effected by horizontally displacing the encoding of the holograms on the light modulator.

### Claim 5 (depends on 1)

Holographic display device according to claim 1, wherein the pixel columns are imaged by the separating elements of the image separation means in a defocussed manner into the observer plane.

### Claim 6 (depends on 1)

Holographic display device according to claim 1, wherein each separating element is additionally assigned with further, non-activated pixel columns in order to increase the stereo contrast.

### Claim 7 (depends on 1)

Holographic display device according to claim 1, wherein the face of the image separation means which is structured with the separating elements is attached to the colour filter and forms one unit with the latter.