Full-color laser projection display using Kr-Ar laser (white laser) beam-scanning technology

Yonghoon Kim; Hang Woo Lee; Seungnam Cha; Jin-Ho Lee; Youngjun Park; Jungho Park; Sung Soo Hong; Young Mo Hwang

doi:10.1117/12.277736

7 July 1997 Full color laser projection display using Kr-Ar laser (white laser) beam-scanning technology

Yonghoon Kim, Hang Woo Lee, Seungnam Cha, Jin-Ho Lee, Youngjun Park, Jungho Park, Sung Soo Hong, Young Mo Hwang

Proceedings Volume 3131, Optical Scanning Systems: Design and Applications; (1997) https://doi.org/10.1117/12.277736
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Full color laser projection display is realized on the large screen using a krypton-argon laser (white laser) as a light source, and acousto-optic devices as light modulators. The main wavelengths of red, green and blue color are 647, 515, and 488 nm separated by dichroic mirrors which are designed to obtain the best performance for the s-polarized beam with the 45 degree incident angle. The separated beams are modulated by three acousto-optic modulators driven by rf drivers which has energy level of 1 watt at 144 MHz and recombined by dichroic mirrors again. Acousto-optic modulators (AOM) are fabricated to satisfy high diffraction efficiency over 80% and fast rising time less than 50 ns at the video bandwidth of 5 MHz. The recombined three beams (RGB) are scanned by polygonal mirrors for horizontal lines and a galvanometer for vertical lines. The photodiode detection for monitoring of rotary polygonal mirrors is adopted in this system for the compensation of the tolerance in the mechanical scanning to prevent the image joggling in the horizontal direction. The laser projection display system described in this paper is expected to apply HDTV from the exploitation of the acousto- optic modulator with the video bandwidth of 30 MHz.

Citation Download Citation

Yonghoon Kim, Hang Woo Lee, Seungnam Cha, Jin-Ho Lee, Youngjun Park, Jungho Park, Sung Soo Hong, and Young Mo Hwang "Full color laser projection display using Kr-Ar laser (white laser) beam-scanning technology", Proc. SPIE 3131, Optical Scanning Systems: Design and Applications, (7 July 1997); https://doi.org/10.1117/12.277736

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