Device for combining light beams which interact with adjacently arranged pixels of a light modulator

Patent metadata

Field	Value
Publication number	US-10871674-B2
Application number	US-201716337585-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Sep 29, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

The present invention relates to a device for combining light beams which interact with adjacently arranged pixels of a light modulator. The present invention furthermore relates to a device for beam combination and to a spatial light modulation device for complex-valued modulation. The invention relates to a device for beam combination, and to an optical arrangement of polarization-sensitive component parts which allows complex-valued modulation of a light field by means of a phase-modulating light modulator and a beam combiner, which is insensitive to changes in the incidence direction of the illumination wave. This document furthermore also relates to various arrangements of reflectively operating light modulators.

First claim

The invention claimed is:

1. A device for combining light beams which interact with adjacently arranged pixels of a light modulator, wherein the light modulator comprises a multiplicity of pixels and is driven in such a way that two adjacent pixels respectively form a macropixel, wherein a beam splitter is provided in relation to a macropixel, which is configured and arranged in such a way that incident light beams are thereby split into a first subbeam and a second subbeam, in such a way that the first subbeam propagates in the direction of the first pixel of the macropixel and the second subbeam propagates in the direction of the second pixel of the macropixel, wherein a first structured beam influencing component is provided between the beam splitter and the light modulator, which is configured in such a way that the first subbeam can thereby be influenced in a different way to the second subbeam, wherein the first and second subbeams pass after interaction with the respective pixel of the macropixel through a second structured beam influencing component, which is configured in such a way that the first subbeam can thereby be influenced in a different way to the second subbeam, wherein a beam combiner is provided, which is configured and arranged in such a way that the first subbeam and the second subbeam can thereby be combined, and wherein a beam selector is arranged between the light modulator and the first or second structured beam influencing component, which is configured in such a way that at least one of first and second subbeams which does not belong to the macropixel are thereby blocked.

2. The device as claimed in claim 1 , wherein the beam splitter and the beam combiner are identically configured optically birefringent uniaxial components and are formed from the same material or with the same optical axes, wherein the optical axes of the two birefringent uniaxial components could be oriented in such a way that the angle with respect to the interface forms an equal angle between the ordinary and extraordinary subbeams for the two components.

3. The device as claimed in claim 1 , wherein at least one of the beam splitter and the beam combiner is configured in the form of at least one volume grating or at least one polarization grating.

4. The device as claimed in claim 1 , wherein the structured beam influencing component comprises a spatial structuring which regionally has the functionality of at least one of a retarder, a λ/2 plate and a λ/4 plate, or wherein the structured beam influencing component comprises a spatial structuring which regionally modifies no optical property of a subbeam.

5. The device as claimed in claim 1 , wherein the beam splitter, the beam combiner, at least one of the first and the second structured beam influencing component is configured and arranged in such a way that the beam path of the first subbeam and the beam path of the second subbeam are essentially configured point-symmetrically with respect to the midpoint between the first pixel and the second pixel of the macropixel.

6. The device as claimed in claim 1 , wherein the beam selector comprises a polarizer.

7. The device as claimed in claim 1 , wherein a beam superposition component is provided, with which the first subbeam and the second subbeam can be made to interfere.

8. The device as claimed in claim 7 , wherein a flatly shaped illumination device is arranged between the light modulator and the beam splitter or between the beam splitter and the beam superposition component, the illumination device comprising a flatly shaped lightguide and an extraction unit, with which the light can be extracted from the lightguide and deviated in the direction of the light modulator, wherein the light reflected at the reflection means propagates essentially undeviated through the illumination device and then through the beam combiner.

9. The device as claimed in claim 1 , wherein the pixels of a macropixel can respectively be driven with an electrical voltage with the same sign.

10. The device as claimed in claim 1 , wherein at least two of the beam splitter, an optionally present beam combiner, the at least one structured beam influencing component and the beam selector are directly arranged on one another or fastened to one another, for example by means of adhesive.

11. The device as claimed in claim 1 , wherein the incident light beams have a linear polarization or a circular polarization, which is oriented or adjusted in such a way that the light beams can be split into the first and second subbeams and recombined.

12. The device as claimed in claim 1 , wherein the light modulator comprises liquid crystals and is configured in such a way that the liquid crystals execute an out-of-plane rotation, wherein the incident light beams are linearly polarized, wherein the structured beam influencing component regionally has the functionality of a λ/2 plate.

13. The device as claimed in claim 1 , wherein the light modulator comprises liquid crystals and is configured in such a way that the liquid crystals execute an in-plane rotation, wherein the incident light beams are linearly polarized, wherein the structured beam influencing component regionally has the functionality of a λ/4 plate.

14. The device as claimed in claim 1 , wherein a spatial structuring of the structured beam influencing component is adapted to a spatial structure of the pixels of the light modulator.

15. An apparatus for the representation of at least one of two-dimensional and three-dimensional image contents and moving scenes, having at least one device as claimed in claim 1 .

16. A device for combining light beams which interact with adjacently arranged pixels of a light modulator, wherein the light modulator comprises a multiplicity of pixels and is driven in such a way that two adjacent pixels respectively form a macropixel, wherein a beam splitter is provided in relation to a macropixel, which is configured and arranged in such a way that incident light beams are thereby split into a first subbeam and a second subbeam, in such a way that the first subbeam propagates in the direction of the first pixel of the macropixel and the second subbeam propagates in the direction of the second pixel of the macropixel, wherein a structured beam influencing component is provided between the beam splitter and the light modulator, which is configured in such a way that the first subbeam can thereby be influenced in a different way to the second subbeam, wherein a reflection means is provided, with which the subbeams are reflected, wherein at least one of the first and the second subbeams passes after interaction with the respective pixel of the light modulator again through the structured beam influencing component and the beam splitter, in order to recombine the first subbeam and the second subbeam, and wherein a beam selector is arranged between the light modulator and the structured beam influencing component, which is configured in such a way that at least one of first and second subbeams which does not belong to the macropixel are thereby blocked.

17. The device as claimed in claim 16 , wherein the beam splitter is configured in the form of an optically birefringent uniaxial component.

18. The device as claimed in claim 16 , wherein the pixels of the light modulator are themselves configured reflectively, or wherein a mirror is arranged after the optically transmissive pixels of the light modulator.

19. The device as claimed in claim 16 , wherein at least one of the beam splitter and the structured beam influencing c

Assignees

• Seereal Tech S A

Inventors

• Leister Norbert
• Reichelt Stephan

Classifications

• G02F1/13

  based on liquid crystals, e.g. single liquid crystal display cells · CPC title

• G02F1/0102

  Constructional details, not otherwise provided for in this subclass · CPC title

• G02F1/01 Primary

  for the control of the intensity, phase, polarisation or colour  (G02F1/29, G02F1/35 take precedence) · CPC title

• G02F1/133638

  Waveplates, i.e. plates with a retardation value of lambda/n · CPC title

• G02F1/133541

  Circular polarisers · CPC title