Abstract: Techniques, systems, and assemblies are presented relating to micro spacers positioned between optical substrates. In some embodiments, a stacked optical assembly comprises a first optical substrate having a first index of refraction greater than 1.4, a second optical substrate having a second index of refraction greater than 1.4 and disposed in a stacked position relative to the first optical substrate, and a plurality of micro spacers positioned between the first optical substrate and the second optical substrate. The plurality of micro spacers may maintain a gap having a gap height between the first optical substrate and the second optical substrate. The plurality of micro spacers may be fixedly attached to (a) the first optical substrate, (b) the second optical substrate, or (c) both the first optical substrate and the second optical substrate.

Abstract: A device is provided. The device includes a waveguide configured to guide an image light to propagate from a light inputting surface to a light outputting surface. The waveguide includes a substrate having a back surface facing an eye-box region of the device and a front surface opposite to the back surface, a plurality of out-coupling structures disposed at the back surface or at least partially inside the substrate, and a medium layer embedded inside the substrate between the out-coupling structures and the front surface. The medium layer has a refractive index that is lower than the substrate. The device also includes an optical lens printed over the back surface of the substrate.

Abstract: The present invention refers to a multifocal lens, in particular ophthalmic multifocal lens, being built in an inkjet printing process of depositing droplets of printing ink side by side and one above the other in several consecutive depositing steps and curing them in intermediate curing steps, wherein the multifocal lens comprises a first section providing a first optical function and a second section providing a second optical function that differs from the first optical function. The present invention further relates to a corresponding method.

Abstract: A printing system for printing a three-dimensional optical component, including a printing unit having a print head with ejection nozzles for ejecting droplets of printing ink, a measurement unit to measure optical properties of a pre-structure of the three-dimensional optical component, wherein the measurement unit includes at least one light source and at least one light detector, further including a process control unit for determining the difference between the measured optical properties of the pro-structure and target optical properties of the pre-structure. The present teachings further relate to a corresponding method.