Hologram replicator assemblies for head up displays including continuous transmission neutral density filters and corrective leveling elements

1. A replicator assembly comprising:

a first replicator comprising:

a first reflective element configured to receive and reflect a first hologram generated by one or more light sources and one or more modulators of a head up display system;

a first transmissive element comprising a partially transmissive portion, wherein the partially transmissive portion is configured to receive a reflection of the first hologram from the first reflective element, output N replications of the first hologram, and reflect at least N−1 replications of the first hologram,

wherein the partially transmissive portion is implemented as a continuous transmission neutral density filter across different phase regions, wherein the phase regions of the partially transmissive portion correspond respectively to the N replications, where N is an integer greater than or equal to 2, and wherein the first reflective element is configured to reflect at least the N−1 replications of the first hologram; and

a first transparent element disposed between the first reflective element and the first transmissive element and configured to guide the N replications of the first hologram between the first reflective element and the first transmissive element; and

a corrective leveling element disposed on the first transmissive element and configured to:

receive the N replications of the first hologram output from the first transmissive element; and

adjust light intensity levels, such that light intensity levels of N replications of the first hologram output from corrective leveling element are more uniform than the light intensity levels of the N replications of the first hologram output from the first transmissive element.

2. The replicator assembly of claim 1 , wherein:

the first transmissive element comprises a fully transmissive portion;

the fully transmissive portion is configured to receive the first hologram generated by the one or more light sources of a head up display system; and

the first transparent element is configured to guide the first hologram from the fully transmissive portion to the first reflective element.

3. The replicator assembly of claim 1 , wherein the partially transmissive portion has an intensity gradient across an output of the partially transmissive portion.

4. The replicator assembly of claim 1 , wherein the partially transmissive portion has an intensity distribution across an output of the partially transmissive portion such that output light intensities of the N replications are at least one of at a same level or within a predetermined range of each other.

5. The replicator assembly of claim 1 , wherein:

the first replicator outputs the N replications with gaps between the N replications; and

each of the gaps are greater than 0 and less than or equal to a predetermined minimum human pupil size.

6. The replicator assembly of claim 1 , wherein:

the corrective leveling element includes an absorption gradient across an output of the corrective leveling element; and

the absorption gradient is based on a density of at least one of nanowires or nanoparticles in the corrective leveling element.

7. The replicator assembly of claim 1 , wherein:

the corrective leveling element includes multiple dielectric layers; and

at least two of the dielectric layers have different indexes of refraction and a thickness gradient across an output of the corrective leveling element.

8. The replicator assembly of claim 1 , wherein:

the first reflective element is in contact with the first transparent element; and

the first transparent element is in contact with the first transmissive element.

9. The replicator assembly of claim 1 , wherein:

no gaps exist between the first reflective element and the first transparent element; and

no gaps exist between the first transparent element and the first transmissive element.

10. A head up display system comprising:

the replicator assembly of claim 1 ;

a control module configured to generate signals based on data, wherein the data includes at least one operating parameter; and

the one or more light sources and the one or more modulators configured to generate the first hologram based on the signals.

11. A replicator assembly comprising:

a first replicator comprising:

a first reflective element configured to receive and reflect a first hologram generated by one or more light sources and one or more modulators of a head up display system;

a first transmissive element comprising a partially transmissive portion, wherein the partially transmissive portion is configured to receive a reflection of the first hologram from the first reflective element, output N replications of the first hologram, and reflect at least N−1 replications of the first hologram,

wherein the partially transmissive portion is implemented as a continuous transmission neutral density filter across different phase regions, wherein the phase regions of the partially transmissive portion correspond respectively to the N replications, where N is an integer greater than or equal to 2, and wherein the first reflective element is configured to reflect at least the N−1 replications of the first hologram; and

a first transparent element disposed between the first reflective element and the first transmissive element and configured to guide the N replications of the first hologram between the first reflective element and the first transmissive element;

a second replicator comprising:

a second reflective element configured to receive and reflect the N replications of the first hologram output from the first transmissive element;

a second transmissive element comprising a partially transmissive portion, wherein the partially transmissive portion is configured to receive reflections of the N replications from the second reflective element, output N×M replications of the first hologram, and reflect at least N×M−N replications of the first hologram,

wherein the partially transmissive portion of the second transmissive element is implemented as a continuous transmission neutral density filter across different phase regions, wherein the phase regions of the partially transmissive portion of the second transmissive element correspond respectively to the N×M replications, and wherein the second reflective element is configured to reflect at least the N×M−N replications of the first hologram;

a second transparent element disposed between the second reflective element and the second transmissive element and configured to guide the N×M replications of the first hologram between the second reflective element and the second transmissive element; and

a corrective leveling element disposed on the second transmissive element and configured to

receive the N×M replications of the first hologram output from the second transmissive element, and

adjust light intensity levels, such that light intensity levels of N×M replications of the first hologram output from corrective leveling element are more uniform than the light intensity levels of the N×M replications of the first hologram output from the second transmissive element.

12. The replicator assembly of claim 11 , wherein:

the partially transmissive portion of the second transmissive element is implemented as a continuous transmission neutral density filter without gaps between different phase regions;

the phase regions of the partially transmissive portion of the second transmissive element correspond respectively to the N×M replications; and

M is an integer greater than or equal to 2.

13. The replicator assembly of claim 11 , wherein:

the second replicator outputs the N×M replications with gaps between the N×M replications; and

each of the gaps are greater than 0 and less than or equal to a predetermined minimum human pupil size.

14. A replicator assembly for a head up display system, the replicator assembly comprising:

a first replicator receive a first hologram generated by one or more light sources and one or more modulators of a head up display, replicate the first hologram N times, and output N replications of the first hologram, where N is an integer greater than or equal to 2;

a corrective leveling element configured to adjust light intensity levels of the N replications of the first hologram, such that light intensity levels of N replications output from corrective leveling element are more uniform than the light intensity levels of the N replications of the first hologram output from the first replicator; and

a second replicator disposed between the first replicator and the corrective leveling element, wherein:

the second replicator is configured to receive the N replications, replicate the N replications M times, and output N×M replications of the first hologram; and

the corrective leveling element is configured to adjust light intensity levels of the N×M replications of the first hologram, such that the light intensity levels of the N×M replications output from corrective leveling element are more uniform than the light intensity levels of the N×M replications output from the second replicator.

15. The replicator assembly of claim 14 , wherein:

the first replicator includes a partially transmissive portion;

the partially transmissive portion is implemented as a continuous transmission neutral density filter without gaps between different phase regions of the partially transmissive portion; and

the phase regions correspond respectively to the N replications.

16. The replicator assembly of claim 14 , wherein:

the second replicator includes a partially transmissive portion;

the partially transmissive portion of the second replicator is implemented as a continuous transmission neutral density filter without gaps between different phase regions of the partially transmissive portion of the second replicator; and

the phase regions of the partially transmissive portion of the second replicator correspond respectively to the N×M replications.

17. A replicator assembly for a head up display system, the replicator assembly comprising:

a first replicator receive a first hologram generated by one or more light sources and one or more modulators of a head up display, replicate the first hologram N times, and output N replications of the first hologram, where N is an integer greater than or equal to 2; and

a corrective leveling element configured to adjust light intensity levels of the N replications of the first hologram, such that light intensity levels of N replications output from corrective leveling element are more uniform than the light intensity levels of the N replications of the first hologram output from the first replicator, wherein:

the corrective leveling element includes an absorption gradient across an output of the corrective leveling element; and

the absorption gradient is based on a density of at least one of nanowires or nanoparticles in the corrective leveling element.

18. A replicator assembly for a head up display system, the replicator assembly comprising:

a first replicator receive a first hologram generated by one or more light sources and one or more modulators of a head up display, replicate the first hologram N times, and output N replications of the first hologram, where N is an integer greater than or equal to 2; and

a corrective leveling element configured to adjust light intensity levels of the N replications of the first hologram, such that light intensity levels of N replications output from corrective leveling element are more uniform than the light intensity levels of the N replications of the first hologram output from the first replicator, wherein:

the corrective leveling element includes multiple dielectric layers; and

at least two of the dielectric layers have different indexes of refraction and a thickness gradient across an output of the corrective leveling element.