In recent years, the Laser display has drawn wide attention due to its large color gamut and high brightness. However, the poor uniformity of color and illumination induced by the monochromatic laser has become an urgent technical problem to solve. In this work, we designed a new optical illumination frame, added a Gaussian 2° diffuser at the diffuse 1 position, expanded and shimmed the laser beam, and uniquely added an achromatic half-wave plate in front of the two red array lasers. To verify the improvement of this optical illumination frame on the illumination and color uniformity, we built a laser illumination system by using a Hitachi NUMM31 model 4*7 array laser, 639nm, 643nm 2*7 red array laser, 525nm 1*7 green array laser, and 465nm 1*7 blue array laser. Moreover, the simulation of color uniformity was conducted by lighttools. The result of color uniformity is Δx=0.08 and Δy=0.01. As a result, the color uniformity of our new optical illumination frame below 0.015 was achieved, while the color uniformity of Hisense products is 0.025. This newly developed optical illumination frame has the high potential to provide a facile pathway to realize high color and illumination uniformity by using diffusers and an achromatic half-wave plate.
As a new generation of display technology, Laser displays a wide range of color gamut, high brightness, and other characteristics. However, as a highly coherent light source, laser speckle will be generated by the interference phenomenon of the reflected light or transmitted light of different surface elements after the incident on the surface of the object, which will seriously reduce the quality of the display image. Therefore, the suppression of laser speckle and the reduction of speckle contrast are always important problems in laser display technology. Here, we presented a speckle suppression scheme suitable for projector optical systems. Speckle suppression by spectral broadening and speckle suppression by superposition of multiple independent and unrelated speckle patterns are included in the scheme. Then, the feasibility of the scheme was verified by simulation. On this basis, the projector system was built. The speckle suppression scheme was added, and the effect of the scheme on speckle contrast was verified by actual measurement, and the speckle contrast was successfully reduced from 0.129 to 0.041, which was difficult for human eyes to distinguish.
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