3D display apparatus

1. A display apparatus for enabling a user to experience a 3D perception in a plurality of directional viewing regions when visual information is presented by the display apparatus, the display apparatus comprising:

an image forming unit that includes a two-dimensional array of image subpixels arranged to emit light for presenting associated visual information, and

an optical system that includes an array of first diffractive optical elements associated with respective ones of the array of image subpixels, each first diffractive optical element being arranged to diffract light from the associated image subpixel into a diffraction pattern including a plurality of diffraction orders to provide the visual information from the associated image subpixel to a plurality of directional viewing regions associated with the plurality of diffraction orders, so as to effectively duplicate the visual information presented by the associated subpixel to each of the plurality of directional viewing regions,

the optical system further including an array of second diffractive optical elements associated with respective one or more first diffractive optical elements of the array of first diffractive optical elements, the array of second diffractive optical elements including a plurality of subsets of second diffractive optical elements,

the second diffractive optical elements of each subset being arranged to provide the diffraction patterns with an associated predetermined subset direction,

the predetermined subset directions of different subsets of second diffractive optical elements being different so as to enable separation of visual information to be presented to the left eye of the user from visual information to be presented to the right eye of the user to enable the user to view with 3D perception,

the array of first diffractive optical elements thus being arranged to provide the visual information from the image subpixels associated with the second diffractive optical elements of the different subsets to each of the directional viewing regions at the associated predetermined different subset directions within each of the plurality of directional viewing regions associated with the plurality of diffraction orders so as to enable the user to view with 3D perception in each of the plurality of directional viewing regions.

2. The display apparatus according to claim 1 , wherein each first diffractive optical element of the array of first diffractive optical elements is arranged to diffract light from the associated image subpixel into the diffraction pattern including the plurality of diffraction orders, wherein adjacent non-suppressed diffraction orders of the plurality of diffraction orders associated with the directional viewing regions are separated by one or more suppressed diffraction orders.

3. The display apparatus according to claim 2 , wherein each first diffractive optical element of the array of first diffractive optical elements is arranged to diffract light from the associated image subpixel into the diffraction pattern including the plurality of diffraction orders according to a plurality of predefined intensity ratios between the diffraction orders.

4. The display apparatus according to claim 2 , wherein the plurality of directional viewing regions are restricted to one or more predefined limited directional ranges.

5. The display apparatus according to claim 2 , wherein each diffractive optical element is a diffractive grating.

6. The display apparatus according to claim 2 , the two-dimensional image forming unit being arranged for emitting light with a predefined angular intensity profile from the image subpixels of the two-dimensional array of image subpixels to the optical system.

7. The display apparatus according to claim 1 , wherein each first diffractive optical element of the array of first diffractive optical elements is arranged to diffract light from the associated image subpixel into the diffraction pattern including the plurality of diffraction orders according to a plurality of predefined intensity ratios between the diffraction orders.

8. The display apparatus according to claim 7 , wherein the plurality of directional viewing regions are restricted to one or more predefined limited directional ranges.

9. The display apparatus according to claim 7 , wherein each diffractive optical element is a diffractive grating.

10. The display apparatus according to claim 1 , wherein the plurality of directional viewing regions are restricted to one or more predefined limited directional ranges.

11. The display apparatus according to claim 10 , wherein each diffractive optical element is a diffractive grating.

12. The display apparatus according to claim 1 , wherein each first diffractive optical element is a diffractive grating.

13. The display apparatus according to claim 1 , the two-dimensional image forming unit being arranged for emitting light with a predefined angular intensity profile from the image subpixels of the two-dimensional array of image subpixels to the optical system.

14. The display apparatus according to claim 13 , the two-dimensional image forming unit being arranged for emitting light with the predefined angular intensity profile with a time-periodically varying angular profile direction and to provide associated visual information to the subpixels to provide the visual information from the image subpixels associated with the different subsets to the directional viewing regions in periodically different directions, to enable the user to view with 3D perception in each of the plurality of directional viewing regions.

15. The display apparatus according to claim 1 , the array of first diffractive optical elements being arranged to provide corresponding diffraction patterns for sets of image subpixels arranged to emit light with different colors to provide corresponding directional viewing regions associated with the plurality of diffraction orders of light with different colors.