# US 11,112,608 B2 · Systems, apparatuses, and methods for image shifting in monochromatic display devices

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- Number: US 11,112,608 B2
- Document ID: US11112608B2
- Status: Granted
- Kind: B2
- Application number: 16/157,554
- Filed: 2018-10-11
- Published: 2019-07-25
- Granted: 2021-09-07
- Earliest claimed: 2018-01-22
- Assignees: Facebook Technologies, LLC
- Applicants: Facebook Technologies, LLC
- Inventors: Nicholas Daniel Trail; James Ronald Bonar; Gareth Valentine
- Web page: https://patentgrep.com/patent/US11112608B2

## CPC

- G02B 27/0172: {characterised by optical features}
- G02B 27/102: {for generating a colour image from monochromatic image signal sources}
- G02B 6/12007: {forming wavelength selective elements, e.g. multiplexer, demultiplexer}
- G02B 6/29316: {Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide (G02B6/02057, G02B6/29332, G02B6/29356 take precedence)}
- G02B 27/0081: {with means for altering, e.g. enlarging, the entrance or exit pupil}
- G02B 27/0955: {Lenses (lenses per se G02B3/00)}
- G03B 21/142: {Adjusting of projection optics}
- G03B 21/2033: {LED or laser light sources}
- G06F 3/147: using display panels
- G09G 3/002: {to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT}
- G09G 3/007: {Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels}
- G02B 6/29328: {Diffractive elements operating in reflection}
- G02B 2027/0112: {comprising device for genereting colour display}
- G02B 2027/0116: {comprising devices for correcting chromatic aberration}
- G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility}
- G02B 2027/0127: {comprising devices increasing the depth of field}
- G02B 2027/014: {comprising information/image processing systems}
- G02B 2027/0147: {comprising a device modifying the resolution of the displayed image}
- G02B 2027/0178: {Eyeglass type (eyeglass details G02C)}
- G02B 2027/0185: {Displaying image at variable distance}
- H10H 20/856: Reflecting means
- H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

The disclosed apparatus may include (1) a plurality of monochromatic emitter arrays, where each of the plurality of monochromatic emitter arrays has a plurality of emitters disposed in a two-dimensional configuration and emits a monochromatic image of a corresponding color, (2) a waveguide configuration that includes (a) a top surface, (b) a bottom surface disposed opposite the top surface, (c) a coupling area that receives the monochromatic images, and (d) a decoupling area that projects a plurality of instances of a polychromatic image including a combination of the monochromatic images toward an eyebox through the bottom surface, and (3) an actuator system that produces lateral shifting of the plurality of instances of the polychromatic image between at least two positions relative to the waveguide configuration. Various other methods and systems are also disclosed.

## Claims

### Claim 1

An apparatus comprising:
a plurality of monochromatic emitter arrays, wherein each of the plurality of monochromatic emitter arrays has a plurality of emitters disposed in a two-dimensional configuration and emits a monochromatic image of a corresponding color;
a waveguide configuration including:
a top surface,
a bottom surface disposed opposite the top surface,
a coupling area that receives the monochromatic images; and
a decoupling area that projects a plurality of instances of a polychromatic image comprising a combination of the monochromatic images toward an eyebox through the bottom surface; and
an actuator system that produces lateral shifting of the plurality of instances of the polychromatic image between at least two positions relative to the waveguide configuration.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the actuator system alters an angular orientation of the plurality of monochromatic emitter arrays relative to the waveguide configuration.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein:
the apparatus further comprises a projector device comprising the plurality of monochromatic emitter arrays;
the projector device further comprises at least one optical component that optically couples the monochromatic emitter arrays to the waveguide configuration; and
the actuator system alters an index of refraction of the at least one optical component to produce the lateral shifting of the plurality of instances of the polychromatic image between the at least two positions relative to the waveguide configuration.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein:
the apparatus further comprises a projector device comprising the plurality of monochromatic emitter arrays;
the projector device further comprises at least one optical component that optically couples the monochromatic emitter arrays to the waveguide configuration; and
the actuator system alters at least one of an angular orientation or a translational position of the at least one optical component relative to the plurality of monochromatic emitter arrays to produce the lateral shifting of the plurality of instances of the polychromatic image between the at least two positions relative to the waveguide configuration.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the actuator system comprises:
a plurality of actuator components, wherein each of the plurality of actuator components is secured to a corresponding one of the plurality of monochromatic emitter arrays and configured to move the corresponding one of the plurality of monochromatic emitter arrays with respect to the waveguide configuration.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the actuator system comprises:
an actuator component secured to the plurality of monochromatic emitter arrays and configured to move the plurality of monochromatic emitter arrays as a unit with respect to the waveguide configuration.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the lateral shifting between the at least two positions corresponds to a fraction of a distance between adjacent emitters of the plurality of monochromatic emitter arrays.

### Claim 8 (depends on 7)

The apparatus of claim 7, further comprising a controller, wherein:
the at least two positions comprises an integer number of positions;
the lateral shifting between the at least two positions comprises a reciprocal of the integer number of positions; and
the controller causes each of the plurality of monochromatic emitter arrays to produce a corresponding portion of the monochromatic image at each of the integer number of positions.

### Claim 9 (depends on 1)

The apparatus of claim 1, wherein the lateral shifting between the at leas two positions corresponds to an integer number of a distance between adjacent emitters of each of the plurality of monochromatic emitter arrays.

### Claim 10 (depends on 9)

The apparatus of claim 9, further comprising a controller, wherein:
the integer number is one;
the at least two positions comprises a first position and a second position; and
the controller causes each of the plurality of monochromatic emitter arrays to:
produce the corresponding monochromatic image at the first position; and
produce a shifted version of the corresponding monochromatic image at the second position.

### Claim 11 (depends on 10)

The apparatus of claim 10, wherein the shifted version of the corresponding monochromatic image compensates for a nonfunctional or underperforming emitter of an associated one of the plurality of monochromatic emitter arrays.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein the shifted version of the corresponding monochromatic image compensates for the nonfunctional or underperforming emitter of the associated one of the plurality of monochromatic emitter arrays by altering at least one of a brightness level or a duty cycle of a fully functional emitter of the associated one of the plurality of monochromatic emitter arrays.

### Claim 13 (depends on 1)

The apparatus of claim 1, further comprising a controller that causes at least one of the plurality of monochromatic emitter arrays to produce a corresponding monochromatic image between the at least two positions.

### Claim 14

A system comprising:
a head-mounted display support configured for securing the system to a user; and
a display system secured to the head-mounted display support and comprising:
a plurality of monochromatic emitter arrays, wherein each of the plurality of monochromatic emitter arrays has a plurality of emitters disposed in a two-dimensional configuration and emits a monochromatic image of a corresponding color;
a waveguide configuration including:
a top surface,
a bottom surface disposed opposite the top surface,
a coupling area that receives the monochromatic images; and
a decoupling area that projects a plurality of instances of a polychromatic image comprising a combination of the monochromatic images toward an eyebox through the bottom surface; and
an actuator system that produces lateral shifting of the plurality of instances of the polychromatic image between at least two positions relative to the waveguide configuration.