Laser speckle eliminating device and laser display equipment thereof

Abstract

The invention relates to the technical field of laser display, in particular to a laser speckle elimination device and laser display equipment thereof, and the device comprises an optical waveguide device which consists of a substrate, an optical waveguide layer and a cladding; wherein the optical waveguide layer is arranged above the substrate, the cladding covers the optical waveguide layer, anda heating device is arranged on the cladding; wherein the refractive index of the optical waveguide layer changes along with the change of temperature, and laser enters the optical waveguide layer from one end surface of the optical waveguide layer and exits from the other end surface of the optical waveguide layer. According to the invention, the temperature in the optical waveguide layer is changed through the heating device, so that the refractive index of the optical waveguide layer is changed, the optical path of laser passing through the optical waveguide layer is changed, the laser coherence is reduced, and the effect of eliminating laser speckles is achieved; and the structure is simple and stable, an additional mechanical auxiliary structure is not needed, and the size of the product is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to a laser speckle elimination device and a laser display device. Background technique [0002] In laser display technology, red, green and blue primary color lasers are used as the light source, which can truly reproduce the rich colors in the objective world. However, due to the good coherence of the laser, when the laser is irradiated on the surface of a rough object, there will be interference between the reflected or projected light, showing irregularly distributed granular points of varying brightness and darkness, that is, laser speckle. Laser speckle is a key factor affecting imaging quality, and has been the focus and difficulty of research in the field of laser display over the years. The graininess caused by laser speckle will seriously affect the quality of laser display images and bring a bad viewing experience. Therefore, laser speckle must be weakened or elimin...

AI Technical Summary

Problems solved by technology

The graininess caused by laser speckle will seriously affect the quality of laser display images and bring a bad viewing experience, so laser speckle must be weakened or eliminated

[0003] Among the existing laser speckle elimination methods, the most common method is to set speckle-eliminating optical elements in the laser light path, and introduce mechanical disturbances to the optical elements, such as setting moving diffusers or diffusers, etc. This method can only be rough effectively eliminate speckle, and due to the introduction of mechanical disturbance, the structure is unstable and the size is relatively large

Images