Device for inhibiting laser speckles and laser projection device

Abstract

The invention discloses a device for inhibiting laser speckles and a laser projection device. The device for inhibiting laser speckles comprises at least two sets of module assemblies; each module assembly comprises a semiconductor laser and a refrigeration device, wherein temperature outputted by the output end of the refrigeration device acts on the semiconductor laser; and temperature outputted by the refrigeration devices in each module assembly is different, correspondingly, temperature difference exits between the semiconductor lasers in each module assembly. According to the device for inhibiting laser speckles provided by the invention, a plurality of sets of module assemblies are adopted, the temperature of the semiconductor lasers in each module assembly is different, so that the wavelengths of laser of the same color outputted by the semiconductor lasers in each module assembly are different and have a certain difference, and therefore, the diversity of laser wavelength can be realized; and the device is simple, is easy to implement, has no other side effects, and can inhibit a laser speckle effect from the perspective of simplicity and easiness in implementation.

Description

technical field [0001] The invention relates to the technical field of laser projection, in particular to a device for suppressing laser speckles. The invention also relates to a laser projection device. Background technique [0002] Laser display is a display technology based on red, green and blue (RGB) three-color lasers as light sources. It is different from the continuous-spectrum high-pressure mercury lamp and xenon lamp system on traditional projectors. This laser display can more truly reproduce the rich and gorgeous colors in the natural world. color. The laser light source of the three-primary color line light source has the characteristics of large color gamut space, rich color types, and high color saturation. Especially in terms of color gamut, it can display 72% of the visible color range of the human eye, while the traditional light source The system is only 30%. [0003] In addition, the light-emitting principle of the laser light source breaks the traditi...

AI Technical Summary

Problems solved by technology

In the prior art, the use of laser-excited phosphor increases the linewidth of the laser spectrum, but at the same time sacrifices the advantages of large laser color gamut, and the scheme of laser-excited phosphor has the problem that the phosphor is overheated and high brightness cannot be realized.

In addition, the method of vibrating the screen is also used in the prior art, but this method has difficulties for hard screens, soft screens and large-size screens, and is not suitable for displays without projection screens.

There are also methods of vibrating random phase plates to suppress speckle, but this method cannot fundamentally eliminate speckle, and random phase plates, scattering films, etc. will reduce the utilization rate of light energy

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