Largan Precision Co., Ltd.

Largan Industrial Optics Co., Ltd.

Yu Jie Hong

Fuh-Shyang Yang

Chun-Che Hsueh

Kuan-Ming Chen

Jih Chung Huang

An optical system includes an image surface, an aperture stop, a first and a second quarter-wave plate, a partial reflector, a reflective polarizer, a first and a second optical lens element. The image surface and the aperture stop are respectively at a front side and a rear side of the optical system. The first quarter-wave plate is between the image surface and the aperture stop. The partial reflector between the first quarter-wave plate and the aperture stop has an average light reflectivity of 35%. The second quarter-wave plate is between the partial reflector and the aperture stop. The reflective polarizer is between the second quarter-wave plate and the aperture stop. The first optical lens element between the image surface and the aperture stop has a convex front-side surface. The second optical lens element between the first optical lens element and the aperture stop has a concave rear-side surface.

Optical system and head-mounted device

A light engine includes an image surface, a projected light surface, a projection lens assembly, and a plurality of folding elements. The image surface has three image areas. The projected light surface has three light sources that provide light with different wavelengths. The plurality of folding elements are arranged along a light emitting axis. The image surface and the projected light surface are substantially in parallel with the light emitting axis, and there is an air gap located between the image surface and the projected light surface. The three light sources respectively correspond to the plurality of folding elements and respectively correspond to the three image areas, and the light emitting axis and the projection lens assembly are disposed on the same optical path.

Light engine and projection device

An optical system includes an aperture stop, an image display surface, a reflective polarizer, a partial reflector, first and second quarter-wave plates, and first, second and third optical lens elements. The aperture stop and the image display surface are respectively at front side and rear side of the optical system. The reflective polarizer is between the aperture stop and the image display surface. The partial reflector is between the reflective polarizer and the image display surface. The first quarter-wave plate is between the reflective polarizer and the partial reflector. The second quarter-wave plate is between the partial reflector and the image display surface. The first, second and third optical lens elements are between the aperture stop and the image display surface in order from the front side to the rear side. The first optical lens element has negative refractive power. The second optical lens element has planar front-side surface.

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Taichung, Taiwan

Yu Jie Hong