Dispelix Oy

Mikhail Erdmanis

Kasimir Blomstedt

Jussi Rahomäki

Ismo Vartiainen

Jussi Rahom Ki

The invention concerns a method of manufacturing a height-modulated optically diffractive grating. The method comprises providing a substrate and manufacturing a plurality of temporary elements of first material onto the substrate, the elements being separated by gaps and arranged as a periodic structure comprising at least two periods having different element heights. A coating layer of second material is deposited on the plurality of temporary elements such that the coating layer fills said gaps and covers said temporary elements. Then, a uniform layer of the second material is removed in order to expose said temporary elements and the first material is removed in order to form a height modulated pattern of the second material onto the substrate as the optically diffractive grating. The invention relaxes manufacturing constraints when manufacturing gratings with locally varying diffraction efficiency.

Method of manufacturing a height-modulated optical diffractive grating

A waveguide display element includes a waveguide comprising two opposing main surfaces, a first optical element arranged at a first location of the waveguide, a second optical element arranged at a second location of the waveguide, and at least one reflector surface extending between said main surfaces and adapted to reflect light rays propagating within the waveguide. The reflector surface is adapted to redirect light rays from the first optical element to the second optical element.

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Espoo, Finland

Mikhail Erdmanis