Patent ID: 11874631
Assignee: ENVISICS LTD
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. A display system comprising:
a first holographic projection channel comprising a first spatial light modulator arranged to display holograms and a light source arranged for illumination of the first spatial light modulator by light of a first wavelength;
a second holographic projection channel comprising a second spatial light modulator arranged to display holograms combined with at least one grating function, wherein each grating function has a respective displacement direction, and a light source arranged for illumination of the second spatial light modulator by light of a second wavelength;
an image capture device; and
a processor;
the display system being configured to align a first holographic reconstruction and a second holographic reconstruction by:
forming a first holographic reconstruction of a first plurality of discrete light features on a display plane using the first holographic projection channel;
forming a second holographic reconstruction of a second plurality of discrete light features on the display plane using the second holographic projection channel;
capturing images of the display plane; and
for each discrete light feature of the first plurality of discrete light features, individually determining a grating angle of each grating function required to align, in the respective displacement direction, the respective first holographic reconstruction of the discrete light feature of the first plurality of discrete light features with the second holographic reconstruction of the corresponding discrete light feature of the second plurality of discrete light features in order to obtain, for each displacement direction, a plurality of grating angles at a respective plurality of different locations on the display plane.