Abstract
Techniques are described for aligning a display element relative to an optical component using image-based measurements and model-driven estimation. One or more image-derived metrics, such as a modulation transfer function (MTF) and/or geometric characteristics including feature displacement or distortion, are evaluated as a function of alignment parameters including translational and rotational degrees of freedom. A set of measurements may be obtained by sampling the metric or metrics at selected positions, and a model of the metric may be constructed or updated using measurement data and prior information, for example derived from simulation or calibration. An alignment configuration associated with improved image quality may be estimated based on the model, for example using optimization or probabilistic inference techniques, and the alignment parameters may be adjusted accordingly. In some examples, different subsets of alignment parameters are refined in stages, including focus-related parameters and angular parameters, using respective sampling strategies. The described approach can be applied to optical systems that utilize camera-based feedback and may reduce the number of measurements relative to iterative search-based alignment methods.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Cakmakci, Ozan; Lai, Weicheng; Lizarazu, Christian; and Karr, David, "Method for Active Aligning a Microdisplay to a Freeform Lightguide", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/10288