Illumination device and image projection apparatus comprising the device
DC CAFC
First Claim
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1. An illumination device, comprising:
- a light source, comprising an array of a plurality of light emitting devices;
an illumination uniformizing means disposed in front of the light source to uniformize a light emitted from the light source, the illumination uniformizing means comprising;
an incident plane, the light emitted from the light emitting device array is incident therefrom;
a bottom plane, comprising a scattering pattern thereon;
a projection plane opposite to the bottom plane, wherein;
the light incident from the incident plane being scattered by the scattering pattern, while the light incident from the incident plane being totally reflected between positions of the bottom plane other than the scattering pattern and the projection plane; and
a reflective side plane opposite to the incident plane, wherein the scattering pattern is gradually condensed from the incident plane towards the reflective side plane; and
a polarization converter, disposed between the illumination uniformizing means and a light valve, to polarize the light from the illumination uniformizing means into a polarized light.
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Abstract
An illumination device and an image display apparatus using the same. The illumination device comprising a light source, an illumination uniformizing device, and a polarization converter. The image display apparatus comprises an illumination device provided in the invention, a synthesizing device, and a projection device.
57 Citations
12 Claims
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1. An illumination device, comprising:
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a light source, comprising an array of a plurality of light emitting devices;
an illumination uniformizing means disposed in front of the light source to uniformize a light emitted from the light source, the illumination uniformizing means comprising;
an incident plane, the light emitted from the light emitting device array is incident therefrom;
a bottom plane, comprising a scattering pattern thereon;
a projection plane opposite to the bottom plane, wherein;
the light incident from the incident plane being scattered by the scattering pattern, while the light incident from the incident plane being totally reflected between positions of the bottom plane other than the scattering pattern and the projection plane; and
a reflective side plane opposite to the incident plane, wherein the scattering pattern is gradually condensed from the incident plane towards the reflective side plane; and
a polarization converter, disposed between the illumination uniformizing means and a light valve, to polarize the light from the illumination uniformizing means into a polarized light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
an integrator, formed of an array of a plurality of lenses, each lens is corresponding to one light emitting device; and
a light converging means, to project and overlap lights from the lenses on the light valve.
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5. The device according to claim 4, wherein the integrator includes a plurality of columnar light converging lenses.
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6. The device according to claim 5, wherein the columnar light converging lenses each comprises a non-spherical incident plane and projection plane.
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7. The device according to claim 5, wherein the columnar light converging lenses include Fresnel type lenses.
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8. The device according to claim 4, wherein the lenses include Fresnel type lenses.
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9. The device according to claim 1, wherein each of the lenses has a corresponding light emitting device.
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10. The device according to claim 1, wherein more than one light emitting devices are disposed and corresponding to a lens.
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11. The device according to claim 1, wherein the polarization converter further comprises a plurality of ¼
- wavelength plates and a plurality of polarization beam splitters, the ¼
wavelength plates being disposed in front of the polarization beam splitters, and the polarization beam splitters being arranged in a zigzag shape, each of the polarization beam splitter having a right angle with the adjacent polarization beam splitter.
- wavelength plates and a plurality of polarization beam splitters, the ¼
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12. The device according to claim 1, wherein the polarization converter further comprising a plurality of polarization beam splitters and a plurality of ½
- wavelength plates, the polarization beam splitters being arranged parallel to each other with an tilt angle to an incident light, and the ½
wavelength plates each being disposed in front of every other of the polarization beam splitters with an right angle to the incident light.
- wavelength plates, the polarization beam splitters being arranged parallel to each other with an tilt angle to an incident light, and the ½
Specification
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Litigation Data
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Current AssigneeIntellectual Ventures Assets 84 LLC (Intellectual Ventures LLC), MEC Management, LLC (Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota)
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Original AssigneeIndustrial Technology Research Institute
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InventorsChen, Kuang-Vu, Tiao, Kuo-Tung, Chuang, Fu-Ming, Yoo, Jinn-Chou
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Primary Examiner(s)Le, N.
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Assistant Examiner(s)LEROUX, ETIENNE PIERRE
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Application NumberUS09/411,625Time in Patent Office1,005 DaysField of Search353/20, 353/38, 353/98, 359/486, 359/487, 359/495, 359/497, 359/500, 359/630, 349/5, 349/62, 349/65, 355/67US Class Current353/98CPC Class CodesF21Y 2105/10 comprising a two-dimensiona...F21Y 2115/10 Light-emitting diodes [LED]G03B 21/208 Homogenising, shaping of th...Y10S 362/80 Light emitting diode
