Display device

Patent metadata

Field	Value
Publication number	US-11048209-B2
Application number	US-201716317328-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Jul 13, 2016
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

The invention relates to a display device, in particular a head-mounted display or a head-up display, for representing a two-dimensional and/or three-dimensional scene. The display device comprises a spatial light modulator device having pixels, and a beam offset device. The spatial light modulator device is illuminatable with light. The beam offset device is configured to be controllable in such a way that the light modulated by the pixels of the spatial light modulator device is laterally displaceable by less than one pixel extent.

First claim

The invention claimed is:

1. A display device, in particular a head-mounted display or a head-up display, for representing a two-dimensional and/or three-dimensional scene, comprising a spatial light modulator device having pixels and a beam offset device, where
the spatial light modulator device is illuminatable with light,
the beam offset device is configured and controllable in such a way that the light modulated by the pixels of the spatial light modulator device is laterally displaceable by less than one pixel extent, and
wherein the generation of segments of the spatial light modulator device in a lateral direction by the beam offset device is combined with the generation of segments of the spatial light modulator device in a lateral direction perpendicular thereto by a deflection device.

2. The display device as claimed in claim 1 , wherein the beam offset device comprises at least one birefringent optical element or at least one volume grating and/or at least one polarization grating.

3. The display device as claimed in claim 2 , wherein the lateral offset of the light is determined by the thickness of the at least one birefringent optical element.

4. The display device as claimed in claim 1 , wherein the beam offset device comprises at least one birefringent optical element and a switch device, the birefringent optical element being coupled to the switch device and controllable in such a way that the incident light is laterally displaceable.

5. The display device as claimed in claim 4 , wherein the switch device comprises at least one polarization switch.

6. The display device as claimed in claim 1 , wherein the beam offset device comprises at least two volume gratings and/or at least two polarization gratings, the at least two volume gratings and/or the at least two polarization gratings being designed to be switchable.

7. The display device as claimed in claim 6 , wherein the lateral offset of the light is adjustable by the selection of a selection of the distance between the at least two volume gratings or between the at least two polarization gratings.

8. The display device as claimed in claim 1 , wherein the beam offset device comprises at least two volume gratings, which are spaced apart from one another, and a switch device, the at least two volume gratings being coupled to the switch device and controllable in such a way that the incident light is laterally displaceable.

9. The display device as claimed in claim 8 , wherein the lateral offset of the light is adjustable by the selection of a distance between the at least two volume gratings.

10. The display device as claimed in claim 1 , wherein the beam offset device comprises at least two polarization gratings, which are spaced apart from one another, and a switch device, the at least two polarization gratings being coupled to the switch device and controllable in such a way that the incident light is laterally displaceable.

11. The display device as claimed in claim 10 , wherein the lateral offset of the light is adjustable by the selection of a distance between the at least two polarization gratings.

12. The display device as claimed in claim 1 , wherein the beam offset device is provided to generate an offset of the light in at least one lateral direction.

13. The display device as claimed in claim 1 , wherein an optical system for generating segments of the spatial light modulator device in an observer region is provided, the beam offset device being controllable in such a way that the individual segments are displaced with respect to one another by less than one pixel extent.

14. The display device as claimed in claim 13 , wherein the optical system is provided for magnified imaging of the segments of the spatial light modulator device.

15. The display device as claimed in claim 13 , wherein the optical system provides anamorphic imaging or broadening of the segments of the spatial light modulator device.

16. The display device as claimed in claim 1 , wherein, for a generation of N segments of the spatial light modulator device in an observer region, a displacement of the individual segments with respect to one another by a value of 1/N of the pixel extent is provided, where N≠1.

17. The display device as claimed in claim 1 , wherein the deflection device comprises at least one deflection element, in particular a liquid-crystal grating.

18. The display device as claimed in claim 1 , wherein, for a primary color of the light, for a plurality of segments of the spatial light modulator device which are to be generated by the beam offset device, the color component of a scene or of a hologram can be written successively into the spatial light modulator device.

19. The display device as claimed in claim 18 , wherein the deflection device is operable with a lower basic frequency than the spatial light modulator device.

20. The display device as claimed in claim 1 , wherein the spatial light modulator device is operable sequentially for individual primary colors RGB for a segment of the spatial light modulator device.

21. The display device as claimed in claim 1 , wherein, in the case of a lateral offset of the light of 1/N of the pixel extent, where N≠1, object points of a two-dimensional or three-dimensional scene are divided according to their position in an observer region into N subregions, which are assigned to N subscenes.

22. The display device as claimed in claim 1 , wherein a beam combiner unit is provided, with which respectively at least two pixels of the spatial light modulator device are combinable to form a macropixel.

23. The display device as claimed in claim 1 , wherein the spatial light modulator device is designed as a MEMS micromirror-based spatial light modulator device.

24. The display device as claimed in claim 23 , wherein mirrors of the MEMS micromirror-based spatial light modulator device comprise a curved surface.

25. A method for representing a two- and/or three-dimensional scene having a high resolution, where a spatial light modulator device comprising pixels is illuminated with light, and a beam offset device is controlled in such a way that a lateral offset of the light modulated by the pixels of the spatial light modulator device by less than one pixel extent is carried out; and
the lateral offset of the light is combined with a light offset in a direction perpendicular thereto by a deflection device.

26. The method as claimed in claim 25 , wherein, by an optical system, segments of the spatial light modulator device are generated in an observer region, the beam offset device being controlled in such a way that the individual segments are merged while being displaced with respect to one another by less than one pixel extent.

27. The method as claimed in claim 26 , wherein anamorphic imaging or broadening of the segments of the spatial light modulator device is carried out by the optical system.

Assignees

• Seereal Tech S A

Inventors

• Kroll Bo
• Leister Norbert

Classifications

• G02B27/0101 Primary

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• G02B2027/0147

  comprising a device modifying the resolution of the displayed image · CPC title

• G02B27/0172

  characterised by optical features · CPC title

• G02B5/1833

  comprising birefringent materials (birefringent elements per se G02B5/3083) · CPC title

• G09G3/003

  to produce spatial visual effects · CPC title