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US 8,894,212 B2Granted
Projector optical system having field lens changing optical angle of illuminated light
AssigneeLG Innotek Co., Ltd.
InventorsEunsung Seo, Seungman Jeong, Hyunho Choi, Sanghun Lee
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Abstract
A projector optical system is provided, the system including an illumination unit including illumination lenses illuminating light downwards, a display device receiving light illuminated from the illumination lenses to enable to realize an image, projection lenses downwardly projecting light emitted from the display device to a screen, and a field lens changing an optical angle of the light illuminated from the illumination lenses and emitting the light to the display device, and changing an optical angle by receiving an image light of the display device and emitting the light to the projection lenses.
Claims19
A projector optical system, the system comprising:
- an illumination unit including illumination lenses illuminating light downwards;
- a display device receiving light illuminated from the plurality of illumination lenses to enable the display device to realize an image;
- a plurality of projection lenses downwardly projecting light emitted from the display device to a screen;
- and
- a first field lens arranged between the illumination unit and the display device for changing a first optical angle of the light illuminated from the plurality of illumination lenses and emitting the light to the display device, and a second field lens arranged between the display device and the plurality of projection lenses for changing a second optical angle by receiving an image light of the display device and emitting the image light to the plurality of projection lenses;
- wherein the plurality of illumination lenses and the plurality of projection lenses are on a same optical axis, and
- wherein the display device is a reflective display device.
4 more elements
A projector optical system, comprising:
- an illumination unit including a plurality of illumination lenses illuminating light downwards;
- a display device receiving light illuminated from the plurality of illumination lenses to enable the display device to realize an image;
- a plurality of projection lenses downwardly projecting light emitted from the display device to a screen;
- and
- a first field lens arranged between the illumination unit and the display device for changing a first optical angle of the light illuminated from the plurality of illumination lenses and emitting the light to the display device, and a second field lens arranged between the display device and the plurality of projection lenses for changing a second optical angle by receiving an image light of the display device and emitting the image light to the plurality of projection lenses;
- wherein a plurality of optical axes of the plurality of illumination lenses is parallel to a plurality of optical axes of the plurality of projection lenses, and
- wherein the display device is a reflective display device.
4 more elements
A projector optical system, comprising:
- an illumination unit including a plurality of illumination lenses illuminating light downwards;
- a display device receiving light illuminated from the plurality of illumination lenses to enable the display device to realize an image;
- a plurality of projection lenses downwardly projecting light emitted from the display device to a screen;
- and
- a first field lens arranged between the illumination unit and the display device for changing a first optical angle of the light illuminated from the plurality of illumination lenses and emitting the light to the display device, and a second field lens arranged between the display device and the plurality of projection lenses for changing a second optical angle by receiving an image light of the display device and emitting the image light to the plurality of projection lenses;
- wherein the illumination unit further includes a collimation lens arranged between a light source and the plurality of illumination lenses for advancing in parallel light emitted from between a light source and the plurality of illumination lenses in a predetermined direction, and an optical component that uniformly emits light from the collimation lens to the display device, and wherein at least one lens of the illumination unit is tilted from an optical axis of the light source, the collimation lens and the optical component, and
- wherein the display device is a reflective display device.
4 more elements
A projector optical system, comprising:
- an illumination unit including a plurality of illumination lenses illuminating light downwards;
- a TIR (Total Information Reflector) reflecting light from the illumination unit and transmitting an image light;
- a display device receiving the light from the illumination unit reflected from the TIR to enable the display device to realize the image light;
- a plurality of projection lenses downwardly projecting light emitted from the display device to a screen;
- and
- a first field lens arranged between the illumination unit and the display device for changing a first optical angle of the light illuminated from the plurality of illumination lenses and emitting the light to the display device, and a second field lens arranged between the display device and the plurality of projection lenses for changing a second optical angle by receiving an image light of the display device and emitting the image light to the plurality of projection lenses;
- wherein the plurality of illumination lenses and the plurality of projection lenses are on a same optical axis, and
- wherein the display device is a reflective display device.
5 more elements
Dependencies are inferred from the claim text.