Optical assembly for head wearable displays

An optical assembly for head wearable display comprising:

• a light redirecting layer, being provided in a first optical path between a first light emitter and a first eye of a viewer, the light redirecting layer comprising a plurality of three dimensional geometric patterns provided on one surface of the light redirecting layer;
• wherein the light redirecting layer comprises a plurality of subunit sections, each of the plurality of subunit sections respectively comprises the plurality of three dimensional geometric patterns with different physical dimensions for respectively receiving and redirecting light emission of different wavelengths of a plurality of first light signals emitted by the first light emitter toward the first eye of the viewer with different incident angles, each of the first light signals corresponds to a first pixel of an image respectively,
• wherein another light redirecting layer is provided in a second optical path between a second light emitter and a second eye of the viewer for respectively receiving and redirecting light emission of different wavelengths of a plurality of second light signals emitted by the second light emitter toward the second eye of the viewer with different incident angles, each of the second light signals corresponds to a second pixel of the image respectively, wherein the different incident angles of the first light signals relate to visual axes of the first eye when perceiving the first pixels, the different incident angles of the second light signals relate to visual axes of the second eye when perceiving the second pixels, the viewer perceives one of the first pixels and a corresponding second pixel to form a binocular pixel of the image,
• wherein the plurality of three dimensional geometric patterns comprise pillar like three dimensional nanostructure protruding from a surface of the light redirecting layer.