Laser image display apparatus
1 Assignment
0 Petitions
Accused Products
Abstract
A light diffuser containing light diffusing elements is arranged in the most appropriate position between a spatial light modulator and an illumination optical system. Thereby, particles as light diffusing elements diffuse rays of light emitted from a laser light source. Accordingly, indefinite numbers of speckle pattern are formed so that, for example, a speckle noise which occurs on an image projected to a screen is reduced. As a result, loss of light amount after light diffusion is suppressed to small amount, and thereby a laser image display apparatus capable of displaying a bright and high-quality image having no luminosity irregularity is provided.
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Citations
42 Claims
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1-16. -16. (canceled)
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17. A laser image display apparatus comprising:
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a laser light source;
a light diffuser containing light diffusing elements, the light diffusing elements moving, swaying or oscillating;
an illumination optical system which irradiates rays of light from the laser light source to the light diffuser;
a spatial light modulator which is arranged near the light diffuser and irradiated by rays of light diffused by the light diffuser to produce image; and
a projection lens which projects to a predetermined plane in space an image produced by the spatial light modulator, wherein a light diffusing angle 0 of the light diffuser, a pitch P of transmission irregularity generated in the light scattering means, a numerical aperture NA of the illumination optical system, and a distance L between the spatial light modulator and the light diffuser have a relationship of P<
2×
tan(θ
/2+Sin−
1(NA))×
L. - View Dependent Claims (18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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19. A laser image display apparatus comprising:
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a laser light source;
a light diffuser containing light diffusing elements, the light diffusing elements moving, swaying or oscillating;
an illumination optical system which irradiates rays of light from the laser light source to the light diffuser;
a spatial light modulator which is arranged near the light diffuser and irradiated by rays of light diffused by the light diffuser to produce image; and
a projection lens which projects to a predetermined plane in space an image produced by the spatial light modulator, wherein a light diffusing angle θ
of the light diffuser, a numerical aperture NA of the illumination optical system, a distance L between the spatial light modulator and the light diffuser and a diagonal screen size D of the spatial light modulator have a relationship of tan(θ
/2+Sin−
1(NA))×
L<
D/3. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification