50results about How to "Eliminate speckle" patented technology

Provided are an illumination system capable of eliminating laser speckle and a projection system employing the illumination system. The illumination system includes a laser light source having at least one laser, and a first diffractive optical element to divide a laser beam emitted from the laser light source into a plurality of partial beams and to time-average the partial beams through a periodical movement to eliminate speckle. Accordingly, the illumination system can eliminate speckle of the beams emitted from the laser light source and the projection system employing the illumination system can achieve a high quality image.

The present invention discloses a laser equalization coupling device for laser display, and includes a trichromatic laser source and a focusing device. The trichromatic laser source comprises at least one red laser device, at least one green laser device, and at least one blue laser device. The focusing device includes a plurality of coupling optical fibers and a bushing. All coupling optical fibers correspond to the laser devices one-to-one. The laser emitted by the laser device couples and enters into the corresponding coupling optical fiber, and all output ends of the coupling optical fibers are packed in the bushing to form a combined beam of output laser. The present invention can meet the brightness requirement of the big-screen laser display, can reduce the volume of the whole coupling device, and can eliminate the beam speckle.

The invention discloses a screen speckle removing system and a speckle removing method thereof. The screen speckle removing system comprise multiple transducers used for vibrating a screen, an intelligent controller used for calculating vibrating data corresponding to the transducers according to screen parameters and multiple vibrating source scanners used for analyzing the vibrating data and correspondingly controlling the transducers; the intelligent controller is connected with the vibrating source scanners separately; the vibrating source scanners are connected with the transducers in a one-to-one corresponding mode; by enabling the screen to vibrate, reflection rays can be randomly reflected to the other directions in a diffusing mode, the reflection rays dynamically change, that is to say, the requirement can be met by achieving dynamic diffuse reflection of the light rays when certain frequency of screen vibrating is achieved, generation of screen speckles is greatly reduced, the speckles can be even completely removed, the effect is good, the cost is low, the user experience is improved, and great convenience is brought.

The invention discloses a laser beam light combining and dodging device used for a full color laser computer moving head light. The laser beam light combining and dodging device comprises a full color laser light source, beam combining optical fibers, a light mixing optical fiber and a dispersion head. The full color laser light source is composed of a plurality of laser devices with different colors, the beam combining optical fibers are composed of a plurality of coupling optical fibers, lasers output by each laser device enter a corresponding coupling optical fiber in a coupling mode, and the other ends of all the coupling fibers are distributed in the space in an evenly arrayed mode and packaged together to be the output end of the beam combining optical fibers. The light mixing optical fiber is a single coupling optical fiber, the excircle of a fiber core of the light mixing optical fiber is equivalent to the excircle of a fiber core of the beam combining optical fibers in size, and moreover the light mixing optical fiber and the output end of the beam combining optical fibers are connected and packaged together. The dispersion head is a dense combination of short optical fibers with fiber cores of 10-100 micrometers. The laser beam light combining and dodging device has the advantages that a plurality of small-power laser modules can be used for light combining and dodging through optical fiber coupling, and the requirements of the computer moving head light for laser total power are met.

Provided is a 3D space scanning uniform light projection display device, which comprises a red light semiconductor laser light source module, a green light semiconductor laser light source module, a blue light semiconductor laser light source module, an X beam combining prism, a beam-shrinking collimating module, an eccentric rotating ball lens, an integral square bar, a relay lens group, a reflector, a collimating lens, a DMD and a projection lens. Red, green and blue laser light is combined by the X beam combining prism and then is input in a collimating way to the eccentric rotating ball lens after beam shrinking, so that the position of the focal point is constantly changing, a rotationally scanned image of a ring is approximately formed at the focal plane, uniform rectangular spots are obtained by entering an integrating square bar and are incident on the DMD through the relay lens group, the reflector and a collimating lens for modulation, then a projection display image is obtained, and finally the projection display image is input to the projection lens. The eccentric rotary ball lens technology improves the uniform light effect and also reduces the speckle contrast, and issuitable for the technical field of laser projection display.

The invention relates to micro laser projection display technologies, particularly provides an optical structure, system and method for eliminating laser projection speckles, and aims at overcoming the defect that the energy efficiency is reduced when the spatial differences are increased to eliminate the speckle phenomenon in current micro laser projection display technologies. The optical structure includes a laser light source, a light mixing stick, a digital micro-mirror device and a DMD array, laser beams emitted by the laser light source is subjected to multiple total reflection in the light mixing stick, emergent lights formed by the multiple total reflection are incident on the digital micro-mirror device which is loaded with digital holography source information, and laser beams emitted from the digital micro-mirror device go through the DMD array and reach a display terminal. On the premise of effectively eliminating the speckle phenomenon, the optical structure, system and method solve the contradiction between speckle elimination and energy efficiency in the current laser projection display technologies. Meanwhile, the optical structure, system and method have the advantages of being simple in structure and easy to implement.

The embodiment of the invention relates to a diffusion reflector plate, a light guide tube, a laser light source device and a laser projector. The diffusion reflector plate comprises a selective reflection layer, a transmission layer, a diffusion layer and a reflection layer which are arranged in sequence, the selective reflection layer can reflect excited light and can transmit exciting light emitted by the laser; the transmission layer is capable of transmitting light incident to the transmission layer; the diffusion layer can scatter exciting light emitted by the laser; the reflection layercan reflect light irradiated to the reflection layer; and the excited light is light generated by exciting a wavelength conversion material by the exciting light. The diffusion reflector plate can beused for manufacturing a light guide pipe for dodging, the dodging performance of the exciting light can be guaranteed, stimulated light can be prevented from being scattered, and the brightness of the stimulated light cannot be lost.

A laser display device, which eliminates speckles generated in the transmission of laser beams and uniformly mixes laser beams of various colors, and an optical coupler therefor. The laser display device includes light sources emitting laser beams; an image display unit displaying an image by the laser beams; and a speckle elimination unit located on a path of the laser beams, and including at least one panel having an uneven part and disposed on an optical axis of the light sources.

A device used in laser display systems for despeckling includes a liquid crystal cell disposed in sandwiched relation between an input and a grounded electrode. A glass cover overlies each electrode. In a first embodiment, the cell may include vertically or randomly oriented liquid crystal molecules and the liquid crystal cell is larger than a laser beam in size for random phase modulation or retardation. Light loss due to diffraction and scattering are substantially eliminated in the absence of pixel structures. In another embodiment, the input electrode is divided into two separate parts. Vertically aligned liquid crystal molecules rotate and follow field fringes created by applying a first voltage to the input electrodes. Additional embodiments include a device that has two wedge-shaped liquid crystal layers, a device that includes plural field-induced gradient index prisms, a device including a tilted mirror, and composite devices.