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US 9,958,765 B2Granted
Projection image display device including optical system
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorMichihiro Okuda
Life of this patent
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Abstract
A projection image display device includes: laser diodes which emit excitation light; a top-hat diffusing element which diffuses and provides the excitation light with a top-hat intensity distribution; a phosphor which emits light when illuminated by the excitation light diffused by the top-hat diffusing element; an integrator rod which homogenizes the light emitted by the phosphor; DMDs which modulate the light homogenized by the integrator rod; and a projector which projects the light modulated by the DMDs.
Claims5
A projection image display device comprising:
- a laser light source which emits excitation light;
- a top-hat diffusing element which diffuses and provides the excitation light with a top-hat intensity distribution;
- a light emitter which emits light when illuminated by the excitation light diffused by the top-hat diffusing element;
- a light homogenization element which homogenizes an intensity distribution of the light emitted by the light emitter;
- a light modulating element which modulates the light whose intensity distribution has been homogenized by the light homogenization element;
- and
- a projector which projects, as an image, the light modulated by the light modulating element, wherein
- the top-hat diffusing element diffuses and provides the excitation light with the top-hat intensity distribution having an emission pattern which is rectangular in shape,
- the light homogenization element is an integrator rod utilizing internal reflections of the light from the light emitter to homogenize the intensity distribution of the light, and
- the integrator rod has an entrance face which is rectangular in shape.
7 more elements
Dependencies are inferred from the claim text.