Vehicle display systems and methods with multifunction holographic RLAD devices

1 . A holographic projection display system for projecting images onto a reflective surface, the holographic projection display system comprising:

a cluster of lighting elements arranged in a predefined pattern, the cluster of lighting elements including:

a plurality of first light diodes of a first light wavelength and each having a respective first emission angle towards the reflective surface, and

a plurality of second light diodes of a second light wavelength and each having a respective second emission angle towards the reflective surface; and

a multilayer holographic optical element (HOE) assembly attached to the cluster of lighting elements forward of the pluralities of first and second light diodes, the multilayer HOE assembly including:

a first holographic panel recorded with a plurality of first holographic patterns each optically configured to diffract the first light wavelength of the first light diodes emitted at one or more of the respective first emission angles, and

a second holographic panel attached to the first holographic panel, the second holographic panel recorded with a plurality of second holographic patterns each optically configured to diffract the second light wavelength of the second light diodes emitted at one or more of the respective second emission angles.

2 . The holographic projection display system of claim 1 , wherein one of the first holographic patterns only diffracts the first light wavelength emitted at the respective first emission angle of a respective one of the first light diodes, and one of the second holographic patterns only diffracts the second light wavelength emitted at the respective second emission angle of a respective one of the second light diodes.

3 . The holographic projection display system of claim 1 , wherein the second holographic panel includes an optically transparent region lacking any holographic patterns and overlapping one of the first holographic patterns of the first holographic panel.

4 . The holographic projection display system of claim 1 , wherein one of the first holographic patterns only diffracts the first light wavelength emitted at the respective first emission angles of two of the first light diodes, and one of the second holographic patterns only diffracts the second light wavelength emitted at the respective second emission angles of two of the second light diodes.

5 . The holographic projection display system of claim 4 , wherein the respective first emission angles of the two of the first light diodes are distinct from each other, and the respective second emission angles of the two of the second light diodes are distinct from each other.

6 . The holographic projection display system of claim 1 , wherein:

one of the first holographic patterns only diffracts the first light wavelength emitted at the respective first emission angle of a respective one of the first light diodes,

one of the second holographic patterns only diffracts the second light wavelength emitted at the respective second emission angle of a respective one of the second light diodes, and

the one of the first holographic patterns overlaps the one of the second holographic patterns such that light diffracted by the overlapping holographic patterns combine to emit an image of a third light wavelength distinct from the first and second wavelengths.

7 . The holographic projection display system of claim 5 , wherein the respective first emission angle of the respective one of the first light diodes is distinct from the respective second emission angle of the respective one of the second light diodes.

8 . The holographic projection display system of claim 1 , further comprising an optically clear adhesive layer mounting the first holographic panel to the second holographic panel.

9 . The holographic projection display system of claim 1 , further comprising:

a plurality of first light prisms or reflectors each located adjacent a respective one of the first light diodes and configured to direct a first reference beam emitted therefrom at the respective first emission angle; and

a plurality of second light prisms or reflectors each located adjacent a respective one of the second light diodes and configured to direct a second reference beam emitted therefrom at the respective second emission angle.

10 . The holographic projection display system of claim 1 , wherein the predefined pattern includes the pluralities of first and second light diodes mounted in a fixed light array with a single row or multiple rows of diodes.

11 . The holographic projection display system of claim 1 , wherein each of the first and second light diodes is a light emitting diode and/or a laser diode.

12 . The holographic projection display system of claim 1 , wherein the first holographic panel is mounted onto and substantially parallel with the second holographic panel.

13 . The holographic projection display system of claim 1 , wherein each of the first and second holographic panels is a substantially flat and optically transparent single-piece panel structure.

14 . A motor vehicle, comprising:

a vehicle body including a passenger compartment and a vehicle windshield;

a plurality of road wheels attached to the vehicle body; and

a holographic projection display system mounted inside the passenger compartment, the holographic projection display system including:

a cluster of lighting elements arranged in a fixed light array, the cluster of lighting elements including multiple first light diodes of a first light wavelength and each having a respective first emission angle towards the vehicle windshield, and multiple second light diodes of a second light wavelength, distinct from the first wavelength, and each having a respective second emission angle towards the windshield, the first emission angles of the first light diodes being distinct from one another, and the second emission angles of the second light diodes being distinct from one another; and

a multilayer holographic optical element (HOE) assembly attached to the cluster of lighting elements forward of the first and second light diodes, the multilayer HOE assembly including a first holographic panel stacked on and mounted to a second holographic panel, the first holographic panel being recorded with multiple first holographic patterns each optically configured to diffract only the first light wavelength of the first light diodes emitted at one or more of the respective first emission angles, and the second holographic panel being recorded with multiple second holographic patterns each optically configured to diffract only the second light wavelength of the second light diodes emitted at one or more of the respective second emission angles.

15 . A method of assembling a holographic projection display system for projecting images onto a reflective surface, the method comprising:

arranging a cluster of lighting elements in a predefined pattern, the cluster of lighting elements including:

a plurality of first light diodes of a first light wavelength and each having a respective first emission angle towards the reflective surface, and

a plurality of second light diodes of a second light wavelength and each having a respective second emission angle towards the reflective surface; and

attaching a multilayer holographic optical element (HOE) assembly to the cluster of lighting elements forward of the pluralities of first and second light diodes, the multilayer HOE assembly including:

a first holographic panel recorded with a plurality of first holographic patterns each optically configured to diffract the first light wavelength of the first light diodes emitted at one or more of the respective first emission angles, and

a second holographic panel attached to the first holographic panel, the second holographic panel recorded with a plurality of second holographic patterns each optically configured to diffract the second light wavelength of the second light diodes emitted at one or more of the respective second emission angles.

16 . The method of claim 15 , wherein one of the first holographic patterns only diffracts the first light wavelength emitted at the respective first emission angle of a respective one of the first light diodes, and one of the second holographic patterns only diffracts the second light wavelength emitted at the respective second emission angle of a respective one of the second light diodes.

17 . The method of claim 15 , wherein the second holographic panel includes an optically transparent region lacking a holographic pattern and overlapping one of the first holographic patterns of the first holographic panel.

18 . The method of claim 15 , further comprising:

mounting a plurality of first light prisms or reflectors each located adjacent a respective one of the first light diodes and configured to direct a first reference beam emitted therefrom at the respective first emission angle; and

mounting a plurality of second light prisms or reflectors each located adjacent a respective one of the second light diodes and configured to direct a second reference beam emitted therefrom at the respective second emission angle.

19 . The method of claim 15 , wherein arranging the cluster of lighting elements in the predefined pattern includes mounting the pluralities of first and second light diodes in a fixed light array with a single row or multiple rows of diodes.

20 . The method of claim 15 , wherein the first holographic panel is mounted onto and substantially parallel with the second holographic panel.