3results about How to "Speckle suppression" patented technology

The invention relates to the technical field of projection systems, in particular to a projection light source which comprises a laser light source, a wide-spectrum light source and a light combining assembly, the laser light source comprises laser subunits of multiple colors, and light emitted by the laser light source is combined with light emitted by the wide-spectrum light source through the light combining assembly to form a combined light beam to be emitted. The projection light source adopts a hybrid structure, integrates the advantages of two light source types, and is high in brightness, high in color gamut, compact in structure, small in occupied volume and good in comprehensive performance, speckles are effectively inhibited, and the quality of projection pictures is improved.

This utility model discloses a dynamic speckle detection system embedded inside a laser projector, relating to the field of laser projector technology. It includes: a laser projection light source, a beam combining and homogenizing module, a speckle suppression module, an image modulation module, a speckle measurement module, and a speckle suppression drive module. The speckle suppression module includes a vibrating device, and the speckle measurement module includes an image acquisition unit and a control unit. The optical axis of the speckle measurement module points towards the projection screen. The output of its image acquisition unit is connected to the control unit, and the output of the control unit is connected to the speckle suppression drive module. The output of the speckle suppression drive module drives the vibrating device. This utility model embeds the speckle measurement system inside the laser projector, allowing arbitrary modulation of the speckle suppression module's operating state according to the actual projection pattern. This avoids the speckle suppression module operating at maximum performance for extended periods, reducing laser power consumption and heat dissipation burden, and significantly improving the lifespan of the speckle suppression module.

This invention discloses a low speckle contrast, high reflectivity aerogel optical material, its preparation method, and its applications. The low speckle contrast, high reflectivity aerogel optical material comprises a transparent aerogel matrix serving as an optical framework; and light-scattering nanoparticles dispersed therein. The aerogel optical material has a first surface and a second surface arranged opposite to each other in the thickness direction. From the first surface to the second surface, the light-scattering nanoparticles exhibit a graded distribution in particle size, with the particle size gradually increasing. This invention utilizes the ultra-low refractive index of the aerogel to suppress Fresnel interface reflection, improve luminous efficiency, and provide a high refractive index difference. Through a "sedimentation-gel synergy" process, a gradient structure with a continuous particle size distribution in the thickness direction is constructed in situ within a single matrix, simultaneously achieving extremely low speckle contrast (<4%) and high light utilization (average visible light reflectivity >90%), while also possessing advantages such as ultra-light weight and good environmental stability.