Arrangement for and method of projecting a color image by switching scan
directions in alternate frames

Abstract

A lightweight, compact image projection module, especially for mounting in a
housing having a light-transmissive window, is operative for causing selected
pixels in a raster pattern of scan lines to be illuminated to produce an image
of high resolution in color. The direction of scanning of the scan lines is
switched between alternate frames, and the resulting image is the superposition
of successive frames integrated for viewing by the human eye.

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(thanks to me_wwwing of Yahoo MVIS private forum)