No abstract

No abstract

A bright direct view laser phosphor display with a large scanning angle has been developed. A scan mirror, to which a dielectric multilayer was applied on a glass substrate, achieved over 99% reflectivity and withstands large laser power. An optical scanning angle of over +/‐ 21.5 degrees was verified, which was achieved with our dual moving‐magnet drive design. Expansion optics for expanding the scanning angle by 1.5 times were developed. The effectiveness of the proposed devices was verified by projecting images on the display.

An effective method to tune the resonant frequency of a micro scanning mirror with a piezoelectric element is presented. Though the resonant frequency (fr) is determined by the structure and size of the micromirror and the torsion bar, the fr varies according to the environmental temperature, driving voltage, and fatigue of the torsion beams. We have developed an effective mechanism to control the stress of the torsion bars using the piezoelectric elements and we succeeded in tuning 0.9% of the resonant frequency of the scanning mirror which corresponds to the variation of the emvironmental temperature with 83 degree.

No abstract