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US 12,619,088 B2Granted
Laser projector with reduced optical elements and improved power efficiency
AssigneeQisda Corporation
InventorsChun-Hao Hu, Tsung-Hsun Wu, Ching-Shuai Huang, Ping-Chung Chou
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Abstract
A laser projector includes a light combining device, a light splitting system, a plurality of light valves, and a beam combiner. The light combining device is for emitting an illumination beam. The light splitting system is for receiving the illumination beam to generate a plurality of color beams. The plurality of light valves is for receiving and modulating the plurality of color beams to generate modulated color beams. The beam combiner is for combining the modulated color beams to form a full-color image.
Claims20
A laser projector comprising:
- a light combining device configured to emit an illumination beam, the light combining device comprising:
- a laser light source configured to provide a first light beam on a first optical path;
- a dichroic mirror having a surface, the dichroic mirror being disposed on the first optical path, the surface being configured to reflect a first portion of the first light beam, and allow a second portion of the first light beam to penetrate the dichroic mirror;
- only a single reflecting mirror disposed on the first optical path, and configured to reflect the second portion of the first light beam to the surface of the dichroic mirror, the surface of the dichroic mirror reflecting the second portion to a second optical path;
- and
- a wavelength converter configured to receive the first portion of the first light beam reflected from the surface and to emit a second light beam to the second optical path, the second light beam penetrating the dichroic mirror;
- wherein:
- the dichroic mirror is disposed between the laser light source and the reflecting mirror;
- the dichroic mirror, the laser light source and the reflecting mirror are aligned in a straight line;
- the second portion of the first light beam sequentially penetrates the dichroic mirror, being reflected by the reflecting mirror and being reflected by the dichroic mirror to the second optical path;
- and
- the second portion of the first light beam and the second light beam form the illumination beam on the second optical path;
- a light splitting system disposed on the second optical path, and configured to receive the illumination beam to generate a plurality of color beams;
- a plurality of light valves configured to receive and modulate the plurality of color beams to generate modulated color beams;
- and
- a beam combiner configured to combine the modulated color beams to form a multi-color image.
13 more elements
A laser projector comprising:
- a light combining device configured to emit an illumination beam, the light combining device comprising:
- a laser light source configured to provide a first light beam on a first optical path;
- a dichroic mirror disposed on the first optical path, and configured to reflect a first portion of the first light beam, and allow a second portion of the first light beam to penetrate the dichroic mirror;
- only a single reflecting mirror disposed on the first optical path, and configured to reflect the second portion of the first light beam to the dichroic mirror, the dichroic mirror reflecting the second portion to a second optical path;
- and
- a wavelength converter configured to receive the first portion of the first light beam reflected from the dichroic mirror and to emit a second light beam to the second optical path, the second light beam penetrating the dichroic mirror;
- wherein:
- the dichroic mirror has positive transmittance and reflectance distributed uniformly on the dichroic mirror, and is disposed between the laser light source and the reflecting mirror;
- the dichroic mirror, the laser light source and the reflecting mirror are aligned in a straight line;
- the second portion of the first light beam sequentially penetrates the dichroic mirror, being reflected by the reflecting mirror and being reflected by the dichroic mirror to the second optical path;
- and
- the second portion of the first light beam and the second light beam form the illumination beam on the second optical path;
- a light splitting system disposed on the second optical path, and configured to receive the illumination beam to generate a plurality of color beams;
- a plurality of light valves configured to receive and modulate the plurality of color beams to generate modulated color beams;
- and
- a beam combiner configured to combine the modulated color beams to form a multi-color image.
13 more elements
Dependencies are inferred from the claim text.