Patent ID: 11871161
Assignee: META PLATFORMS TECHNOLOGIES, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 8:
9. A calibration system for calibrating a display device comprising a projector for providing image light carrying an image in angular domain, and a pupil expander operably coupled to the projector for relaying the image light to an eyebox of the display device, the calibration system comprising:
a test camera for receiving the image light from the pupil expander, wherein at least one of the pupil expander or the test camera is movable to change a position of the test camera at the eyebox; and
a test controller operably coupled to the test camera and the display device and configured to:
cause the display device to display a calibration frame;
determine a first dependence of optical throughput of the pupil expander on a beam angle and a beam coordinate at the eyebox, by obtaining at least one image of the calibration frame with the test camera;
determine basis vectors and reconstruction coefficients representing a compressed approximation of the first dependence; and
store the basis vectors and the reconstruction coefficients for subsequent access by the display device.