100results about How to "Reduce speckle effect" patented technology

The invention discloses a laser source comprising a laser device, a fluorescent wheel, a color filter wheel. The fluorescent wheel is excited by laser to emit fluorescence. The laser emitted from the laser device passes through a first diffusion slice before reaching the fluorescent wheel. The first diffusion slice is fixedly arranged. After being combined, the laser and the fluorescence pass through a second diffusion slice before being subjected to color filtering of the color filter wheel. The second diffusion slice is controlled to rotate. The cooperation of the first diffusion slice and the second diffusion slice effectively increases the spatial random phase of the laser, forms multiple independent speckle patterns, effectively weakens a speckle effect, and improves projection image display quality.

A method of performing a DFT (discrete Fourier transform) or a DFT derived transform on data, comprising: providing spatially modulated light having spatial coherence, said spatially modulated light representing the data to be transformed; Fourier transforming said spatially modulated light, using an at least one optical element; and compensating for at least one of a scaling effect and a dispersion effect of said at least one optical element, using an at least one dispersive optical element.

An image projecting device and method are presented. The device comprises a light source system, a spatial light modulator (SLM) unit, and an image projection optics accommodated at the output side of the SLM unit. The SLM unit may be reflective or transmissive. The SLM unit comprises an SLM pixel arrangement enclosed between two glass substrates. The pixel array arrangement is formed by a pixel array assembly and at least one microlens assembly. The microlens assembly includes at least one microlens array accommodated proximate of the pixel array assembly. The light source system may comprise n light sources and a light converting means in optical path of light generated by the n light sources, to thereby produce m light beams of different wavelength ranges, wherein m>n. The light source system may comprise a multi-mode laser, thereby reducing a speckle effect in an integrated speckle pattern produced by the multiple modes, as compared to that of a single mode.

Speckle effect in scanning display systems that employs polarized phase-coherent light is reduced by depolarizing the phase-coherent light using a depolarizer and scanning the depolarized light for producing desired images.

Apparatus for reducing speckle, including a first coherence-reducing component, having a first array of transparent first elements arranged to receive different, respective first portions of a collimated light beam that is incident on the first component, the first elements generating different, respective optical lengths with respect to the light beam passing therethrough and outputting the respective first portions as respective first collimated sub-beams. The apparatus further includes a second coherence-reducing component, having a second array of transparent second elements arranged to receive different, respective second portions of each of the first collimated sub-beams of the light beam, the second elements generating different, respective optical lengths with respect to the light beam passing therethrough and outputting the respective second portions as respective second collimated sub-beams. The apparatus also includes a light combiner, which is arranged to combine the second collimated sub-beams into a collimated output beam.

The invention discloses a speckle eliminating part. The speckle eliminating part comprises a first diffusion sheet, a second diffusion sheet and a driving part; the first diffusion sheet and the second diffusion sheet have a public rotating shaft; the first diffusion sheet is a wedge-shaped lens; the included angle between at least one surface of the wedge-shaped lens and the public rotating shaftis not equal to 90 DEG; the diversity of the divergence angle of incident laser beams after continuously passing through the two diffusion sheets can be improved; the random phase generation probability is increased; random phases can generate random speckle patterns; therefore, the laser beam coherence is reduced; and the speckle effect is greatly reduced through human eye integration. The invention further provides a laser source and laser projection device using the speckle eliminating part.

The invention proposes a light-source device, in particular for use in a micromirror device, comprising a first red light source for emitting light in the red spectral range, a second red light source for emitting light in the red spectral range, a green light source for emitting light in the green spectral range and a blue light source for emitting light in the blue spectral range, and superposition means, wherein the superposition means are arranged in such a way that the light from the first red light source, the light from the second red light source, the light from the blue light source and the light from the green light source are superposed in a collinear manner to form a common light beam, the light from the first red light source having a wavelength different from that of the light from the second red light source.

A fiber optical illumination delivery system, which is effective in reducing the effects of source coherence. The system preferably utilizes either a single bundle of optical fibers, or serial bundles of optical fibers. In the single bundle embodiment, the differences in optical lengths between different fibers of the bundle is preferably made to be equal to even less than the coherence length of the source illumination. In the serial bundle embodiment, the fibers in the other bundle are arranged as groups of fibers of the same length, and it is the difference in lengths of these groups which is made equal to, or even more preferably, less than the overall difference in length between the shortest and the longest fibers in the other bundle. Both of these fiber systems enable construction of illumination systems delivering a higher level of illumination, but without greatly affecting the coherence breaking abilities of the system, thus enabling a generally more applicable system to be constructed.