High-frequency raster pinch correction scanner for retinal scanning displays

Hakan Urey; Frank A. DeWitt IV; Karlton D. Powell; Mircea M. Bayer

doi:10.1117/12.443107

2 October 2001 High-frequency raster pinch correction scanner for retinal scanning displays

Hakan Urey, Frank A. DeWitt IV, Karlton D. Powell, Mircea M. Bayer

Proceedings Volume 4561, MOEMS and Miniaturized Systems II; (2001) https://doi.org/10.1117/12.443107
Event: Micromachining and Microfabrication, 2001, San Francisco, CA, United States

Abstract

High-resolution (i.e., large pixel-count) and high frame rate dynamic microdisplays can be implemented by scanning a photon beam in a raster format across the viewer's retina. A resonant horizontal scanner and a linearly driven vertical scanner can create a 2-D raster for video display. The combined motion of the two scanners form a sinusoidal raster in the vertical direction and cause non-uniform line spacing for the case of bidirectional scanning as if the forward and return half-period raster lines are pinched near the edge of the display screen. Raster pinch effect degrades the image quality, especially for multi-beam scanning systems. What is needed is a vertical scanner that creates a stairstep motion instead of linear motion. A third scanner can be added to the system to create an approximation to a staircase motion in the vertical axis and correct for the non-uniform raster spacing. The raster pinch scanner requirements, mechanical and magnetic designs with FEA analysis, and preliminary test results are discussed in this paper.

Citation Download Citation

Hakan Urey, Frank A. DeWitt IV, Karlton D. Powell, and Mircea M. Bayer "High-frequency raster pinch correction scanner for retinal scanning displays", Proc. SPIE 4561, MOEMS and Miniaturized Systems II, (2 October 2001); https://doi.org/10.1117/12.443107

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