Abstract
According to the needs of solid-state volumetric true-3Ddisplay for high brightness and adjustable color temperatures,aprojection light source with high power and single chip Light Emitting Diodes(LEDs)was designed.The brightness of the projection light source was computed theoretically.The results were then corrected according to the spectrum curve of a Liquid Crystal(LC)shutter. With the considerations of life and heat dissipation,the projection light source with high-power RGB LEDs and a white LED was put forward.Based on the optical characteristics of the chosen LEDs,the refraction-and-reflection mixed method was applied to the design of collimating lens.Both simulation and practical test were performed on the projection light source.The experimental results show thatthe divergence angle of the LED has been reduced from ±75°to ±20°after applying the collimating lens.A 3Ddisplay prototype was developed.The practical luminance on the LC shutter close to observers reaches 149cd/m2.The prototype presents the merits of no perceived flickers and strong 3D feeling,as well as the shortcoming of a smaller viewing angle.The proposed light source satisfies the requirements of solid-state volumetric true-3Ddisplay.
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