Laser projection display system
AssigneeEastman Kodak Company
InventorsAndrew F. Kurtz, Brian E. Kruschwitz, Sujatha Ramanujan
Life of this patent
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Abstract
A display apparatus includes a laser light source for emitting a light beam having a coherence length; a beam expander for expanding the light beam; a spatial light modulator; beam shaping optics for shaping the expanded laser beam to provide uniform illumination of the spatial light modulator, the beam shaping optics including a fly's eye integrator having an array of lenslets; a diffuser located in the light beam between the laser light source and the beam shaping optics; an electrically controllable de-speckling modulator for modifying the temporal and spatial phase of the light beam; and a projection lens for producing an image of the spatial light modulator on a distant screen.
Claims44
A display apparatus, comprising:
- a) a laser light source for emitting a light beam having a coherence length;
- b) a beam expander for expanding the light beam;
- c) a spatial light modulator;
- d) beam shaping optics for shaping the expanded laser beam to provide uniform illumination of the spatial light modulator, the beam shaping optics including a fly's eye integrator having an array of lenslets;
- e) a diffuser located in the light beam between the laser light source and the beam shaping optics;
- f) an electrically controllable de-speckling modulator for modifying the temporal and spatial phase of the light beam;
- and
- g) a projection lens for producing an image of the spatial light modulator on a distant screen.
Display apparatus, comprising:
- a) a laser light source for emitting a light beam;
- b) a beam expander for expanding the light beam;
- c) a linear spatial light modulator;
- d) beam shaping optics for shaping the expanded laser beam to provide uniform illumination of the spatial light modulator, the beam shaping optics including a fly's eye integrator having an array of lenslets;
- e) an electrically controllable de-speckling modulator for modifying the temporal and spatial phase of the light beam;
- and
- f) a projection lens and a scanning means for producing a two dimensional image on a distant screen.
Display apparatus, comprising:
- a) a laser light source for emitting a light beam;
- b) a beam expander for expanding the light beam;
- c) a spatial light modulator;
- d) beam shaping optics for shaping the expanded laser beam to provide uniform illumination of the spatial light modulator, the beam shaping optics including a beam homogenizer to provide uniform illumination of the spatial light modulator;
- e) a diffuser located in the light beam between the laser light source and the beam shaping optics;
- f) an electrically controllable de-speckling modulator to modify the temporal and spatial phase of the light beam;
- and
- g) a projection lens for producing an image of the spatial light modulator on a distant screen.
A method of displaying an image, comprising the steps of:
- a) providing a laser projector having:
- i) a laser light source for emitting a light beam;
- ii) a beam expander for expanding the light beam;
- iii) a spatial light modulator;
- iv) beam shaping optics for shaping the expanded laser beam to provide uniform illumination of the spatial light modulator;
- and
- v) a diffuser located in the light beam between the laser light source and the beam shaping optics;
- b) locating an electrically controllable de-speckling modulator in the light beam;
- and
- c) projecting an image on a screen with the laser projector, while operating the de-speckling modulator to modify the temporal and spatial phase of the light beam, thereby reducing the visibility of speckle in the projected image.
A method of displaying an image, comprising the steps of:
- a) providing a laser projector having:
- i) a laser light source for emitting a light beam;
- ii) a beam expander for expanding the light beam;
- iii) a spatial light modulator;
- and
- iv) beam shaping optics for shaping the expanded laser beam to provide uniform illumination of the spatial light modulator;
- b) locating an electrically controllable de-speckling modulator in the light beam;
- and
- c) projecting an image on a screen with the laser projector, while operating the de-speckling modulator to modify the temporal and spatial phase of the light beam, thereby reducing the visibility of speckle in the projected image.
Dependencies are inferred from the claim text.