OPTICAL LAYERED COMPOSITE HAVING A COATING THICKNESS BELOW A THRESHOLD AND ITS APPLICATION IN AUGMENTED REALITY

摘要

In general, the present invention relates to an optical layered composite, in particular for use in an augmented reality device. In particular, the invention relates to an optical layered composite and a process for its preparation, a device comprising the optical layered composite and a process for its preparation, and the use of an optical layered composite in an augmented reality device.;The present invention relates to an optical layered composite comprising:i.) a substrate having a front face, a back face, a thickness d_s between the front face and the back face and a refractive index n_s,ii.) a coating applied to the front face, the coating comprising 1 or more coating layers,wherein, for at least one wavelength λ_g in the range from 390 nm to 700 nm, the coating satisfies the following criterionE. eitherv.) n_c n_s; orvi.) n_c n_s, and $d_c\frac{k}{\sqrt{n_c^2-n_s^2}}\mathrm{.}\mathop{\mathrm{image}}$ arctan $\sqrt{\frac{n_s^2-1}{n_c^2-n_s^2}}\mathop{\mathrm{image}}$wherein n_c is the mean refractive index of the coating layers, weighted by thickness;wherein d_c is the total thickness of the coating;wherein thicknesses are determined in a direction perpendicular to the front face;wherein k = λ_g/4π.