Distortions of the virtual image in augmented reality displays based on waveguide holograms: The arising of tangential distortion and magnification chromatism

Putilin N.А., Dubynin S.E., Putilin A.N., Kopenkin S.S., Borodin Y.P.

For Russian citation (Opticheskii Zhurnal):

Путилин Н.А., Дубынин С.Е., Путилин А.Н., Копёнкин С.С., Бородин Ю.П. Искажения виртуального изображения в схемах дисплеев дополненной реальности на волноводных голограммах: возникновение тангенциальной дисторсии и хроматизма увеличения // Оптический журнал. 2024. Т. 91. № 3. С. 79–94. http://doi.org/10.17586/1023-5086-2024-91-03-79-94

Putilin N.A., Dubynin S.E., Putilin A.N., Kopenkin S.S., Borodin Yu.P. Distortions of the virtual image in augmented reality displays based on waveguide holograms: the arising of tangential distortion and magnification chromatism [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 3. P. 79–94. http://doi.org/10.17586/1023-5086-2024-91-03-79-94

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Waveguide holographic periscopes and virtual image distortions arising in augmented reality display circuits. Aim of study. Determination of the main sources of distortion in the virtual image formed by a waveguide holographic periscopic displays. Study of identified specific types of distortions. Method. At the first step, we used mathematical modeling for analyzing the influence of various errors arising in the process of manufacturing of waveguide holographic periscopes. The simulation was carried out in the geometric optics approximation with application of the vector diagrams method. We created a program for simulating a virtual image forming in head mounted of the display circuits based on waveguide holograms which uses the mentioned approaches. A specialized ray tracing program designed by the authors was also used. At the second step, the recording and experimental study of the samples of waveguide holographic periscopes with specified parameters were carried out. Main results. It has been defined that the inconstancy of the period of waveguide holograms and the wedge shape of the waveguides leads to distortions of a similar nature that cannot be fully compensated by the projection system. Errors in the orientation of waveguide holograms relative to each other, as well as errors in their periods, lead to the appearance of tangential distortion and magnification chromatism. The average output angle (angle of beams after the waveguide outcoupling) also changes greatly. Practical significance. We have identified the manufacturing errors that lead to specific distortions of the virtual image. The estimated requirements for certain types of errors in the waveguide holographic periscopes manufacturing process were determined. The results of the study can be used in the new designs development for augmented reality displays.

Keywords:

waveguide holograms, waveguide holographic periscopes, virtual image distortion, augmented reality displays

Acknowledgements:

the team of authors expresses gratitude to the Samsung Research Center for long-term and effective cooperation

OCIS codes: 090.2820, 090.2890

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