Patent ID: 11947149
Assignee: AZUMO, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G | IPC F

Claim 18:
19. A method of manufacturing a display, the method comprising:
forming a lightguide comprising a core layer having opposing surfaces with a thickness not greater than 0.5 millimeters therebetween, a first cladding layer having a first side optically coupled to the core layer and an opposing second side, and a light emitting region comprising a plurality of light extraction features arranged in a pattern that varies spatially in the light emitting region;
positioning a light source to emit light that propagates into the core layer, totally internally reflects within the core layer, and is extracted from the core layer by the plurality of light extraction features such that the light exits the core layer in the light emitting region into the first cladding layer;
forming a light turning film comprising a plurality of light turning features comprising a first surface and second surface, the first surface of the light turning features directing the light extracted from the core layer by the plurality of light extraction features toward a reflective spatial light modulator;
coating the first surface of the light directing features with a first thickness of a first material with a first refractive index, and the second surface does not comprise a coating of the first material or comprises a coating of a second thickness of the first material less than the first thickness and less than 500 nanometers; and
optically coupling the light turning film to the second side of the first cladding layer and a reflective spatial light modulator.