Speckle elimination device and method and laser display projection system

Abstract

The present invention discloses a speckle elimination device which comprises a refraction unit between a laser light source and an optical fiber, the refraction unit is used for refracting a laser beam emitted from the laser light source into an optical fiber such that the laser beam is transmitted along a helical path which is tangential to a caustics in the optical fiber, and the optical axis ofthe laser beam emitted from the laser light source and the optical axis of the optical fiber are on the same line. According to the speckle elimination device, the coherence of the laser is effectively reduced, and the effect of eliminating speckles is achieved.

Description

technical field [0001] The invention relates to the field of laser projection display, in particular to a speckle elimination device, method and laser display projection system. Background technique [0002] Laser projection display technology has the advantages of high width and large color gamut. As a new generation of display technology, it has received great attention from the scientific and industrial circles. However, the laser has the characteristics of strong coherence, which will cause scattering. The speckle effect will seriously affect the quality of the displayed image, and it is difficult to effectively eliminate the speckle effect. Therefore, the introduction of the speckle effect has become the most important problem restricting the development of laser projection display technology. [0003] In view of this problem, in the prior art, it is generally solved by increasing the laser broadband or laser wavelength diversity, such as changing the resonator structur...

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Problems solved by technology

[0002] Laser projection display technology has the advantages of high width and large color gamut. As a new generation of display technology, it has received great attention from the scientific and industrial circles. However, the laser has the characteristics of strong coherence, which will cause scattering. The speckle effect will seriously affect the quality of the displayed image, and it is difficult to effectively eliminate the speckle effect. Therefore, the introduction of the speckle effect has become the most important problem restricting the development of laser projection display technology.

[0003] In view of this problem, in the prior art, it is generally solved by increasing the laser broadband or laser wavelength diversity, such as changing the resonator structure or using nonlinear optical technology to realize the broadening of the laser spectrum, but the conversion efficiency of the laser light source using these technologies And the output power is very low, and the structure is extremely complex, which cannot meet the basic needs of display products

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