# US 12,366,751 B2 · Apparatus for projecting images towards a user

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- Number: US 12,366,751 B2
- Document ID: US12366751B2
- Status: Granted
- Kind: B2
- Application number: 18/243,734
- Filed: 2023-09-08
- Published: 2024-03-14
- Granted: 2025-07-22
- Earliest claimed: 2022-09-12
- Assignees: Nokia Technologies Oy
- Applicants: Nokia Technologies Oy
- Inventors: Toni Johan Jarvenpaa; Marja Pauliina Salmimaa
- Web page: https://patentgrep.com/patent/US12366751B2

## CPC

- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G09G 3/003: {to produce spatial visual effects}
- B60K 35/23: Head-up displays [HUD] (optical aspects of head-up displays G02B27/01)
- G02B 27/0081: {with means for altering, e.g. enlarging, the entrance or exit pupil}
- G02B 27/0093: {with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking}
- G02B 27/0179: {Display position adjusting means not related to the information to be displayed}
- 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}
- B60K 35/211: {producing three-dimensional [3D] effects, e.g. stereoscopic images}
- B60K 35/234: controlling the brightness, colour or contrast of virtual images depending on the driving conditions or on the condition of the vehicle or the driver
- B60K 35/235: with means for detecting the driver's gaze direction or eye points
- G02B 27/4272: {having plural diffractive elements positioned sequentially along the optical path}
- G02B 2027/0112: {comprising device for genereting colour display}
- G02B 2027/0129: {comprising devices for correcting parallax}
- G02B 2027/0132: {comprising binocular systems}
- G02B 2027/0134: {of stereoscopic type}
- G02B 2027/0136: {with a single image source for both eyes}
- G02B 2027/0187: {slaved to motion of at least a part of the body of the user, e.g. head, eye}
- G09G 2300/023: Display panel composed of stacked panels
- G09G 2354/00: Aspects of interface with display user
- G09G 2380/10: Automotive applications
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

An apparatus including a first display means projecting light in a first band of wavelengths to form a first image at a first eye of a user and for projecting light in the first band of wavelengths to form a second image at a second eye of the user; a second display for projecting light in a second band of wavelengths to form a third image at the first eye of the user and at the second eye of the user, wherein the first band of wavelengths and the second band of wavelengths are different.

## Claims

### Claim 1

An apparatus comprising:
a first display for projecting light in a first band of wavelengths to form a first image at a first eye of a user and for projecting light in the first band of wavelengths to form a second image at a second eye of the user;
a second display for projecting light in a second band of wavelengths to form a third image at the first eye of the user and at the second eye of the user;
wherein the first band of wavelengths and the second band of wavelengths are different;
wherein the first image is a partial image created from a reference image and is colored in the first band of wavelengths and the third image is a partial image and created from the reference image and is colored in the second band of wavelengths at the first eye, and wherein the second image is a partial image and created from the reference image and is colored in the first band of wavelengths and the third image is a partial image and created from the reference image and is colored in the second band of wavelengths at the second eye; and
wherein the first display and the second display are aligned in a stack and in close proximity such that the first display is further from the user than the second display.

### Claim 2 (depends on 1)

An apparatus as claimed in claim 1, wherein the first display and the second display are configured to superpose the first image and the third image, in register, at the first eye of the user and to superpose the second image and the third image, in register, at the second eye of the user.

### Claim 3 (depends on 1)

An apparatus as claimed in claim 1, wherein the first display and the second display are configured to superpose the first image and the third image, in register, at the first eye of the user to create a fourth image at the first eye and to superpose the second image and the third image, in register, at the second eye of the user to create the fourth image at the second eye.

### Claim 4 (depends on 1)

An apparatus as claimed in claim 1, comprising:
at least one processor; and
at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform:
obtaining a user position; and
adjusting, in dependence upon the user position, at least one of the first image, second image and third image to superimpose, in register, the first image and the third image at the first eye of the user and the second image and the third image at the second eye of the user.

### Claim 5 (depends on 4)

An apparatus as claimed in claim 4, wherein the instructions, when executed with the at least one processor, are configured to adjust, in dependence upon the user position, at least one of the first image, second image and third image to superimpose, in register, the first image and the third image at the first eye of the user and the second image and the third image at the second eye of the user to create a fourth image at the first eye and at the second eye.

### Claim 6 (depends on 5)

An apparatus as claimed in claim 5, wherein the instructions, when executed with the at least one processor, are configured to adjust, in dependence upon the user position, at least one of the first image, second image and third image by performing one or more of: a relative lateral shift, a rescale.

### Claim 7 (depends on 1)

An apparatus as claimed in claim 1, comprising:
at least one processor; and
at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform:
determining a user position, optionally for determining user eye positions or eye pupil positions.

### Claim 8 (depends on 1)

An apparatus as claimed in claim 1, wherein the first display is configured for simultaneous projection of light in a first band of wavelengths to form the first image at the first eye of a user and of light in the first band of wavelengths to form the second image at the second eye of the user.

### Claim 9 (depends on 1)

An apparatus as claimed in claim 1, wherein the second display comprises one or more exit pupil expanders.

### Claim 10 (depends on 1)

An apparatus as claimed in claim 1, comprising a display adjustment for adjusting a projection direction of the first display and/or the second display.

### Claim 11 (depends on 1)

An apparatus as claimed in claim 1 wherein the first display and the second display are configured such that the first wavelength band and the second band are non-overlapping, and optionally the first band of wavelengths is a lower wavelength than the second band of wavelengths.

### Claim 12 (depends on 1)

An apparatus as claimed in claim 1 configured as an exit pupil expander head up display, optionally a vehicle head up display.

### Claim 13 (depends on 1)

An apparatus as claimed in claim 1, comprising as the first display a portable handheld device comprising a color display screen and a binocular display configured to project light from the color display screen to form a first image at the first eye of the user and to project light from the color display to form a second image at the second eye of the user.

### Claim 14

A method comprising:
projecting light in a first band of wavelengths to form a first image at a first eye of a user;
projecting light in the first band of wavelengths to form a second image at a second eye of the user;
projecting light in a second band of wavelengths to form a third image at the first eye of the user and at the second eye of the user;
wherein the first band of wavelengths and the second band of wavelengths are different;
wherein the first image is a partial image created from a reference image and is colored in the first band of wavelengths and the third image is a partial image and created from the reference image and is colored in the second band of wavelengths at the first eye, and wherein the second image is a partial image and created from the reference image and is colored in the first band of wavelengths and the third image is a partial image and created from the reference image and is colored in the second band of wavelengths at the second eye; and
wherein the light projected in the first band of wavelengths is projected from a first display behind a second display from which the light projected in the second band of wavelengths is projected, and wherein the first display and the second display are aligned in a stack and in close proximity such that the first display is further from the user than the second display.

### Claim 15

A non-transitory program storage device readable with an apparatus, tangibly embodying a program of instructions that, when executed with the apparatus, cause the apparatus to perform at least the following:
projecting light in a first band of wavelengths to form a first image at a first eye of a user;
projecting light in the first band of wavelengths to form a second image at a second eye of the user;
projecting light in a second band of wavelengths to form a third image at the first eye of the user and at the second eye of the user;
wherein the first band of wavelengths and the second band of wavelengths are different;
wherein the first image is a partial image created from a reference image and is colored in the first band of wavelengths and the third image is a partial image and created from the reference image and is colored in the second band of wavelengths at the first eye, and wherein the second image is a partial image and created from the reference image and is colored in the first band of wavelengths and the third image is a partial image and created from the reference image and is colored in the second band of wavelengths at the second eye; and
wherein the light projected in the first band of wavelengths is projected from a first display behind a second display from which the light projected in the second band of wavelengths is projected, and wherein the first display and the second display are aligned in a stack and in close proximity such that the first display is further from the user than the second display.