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US 5,402,184 AGranted
Projection system having image oscillation
AssigneeNorth American Philips Corporation
InventorsWilliam J. O'Grady, William F. Guerinot
Life of this patent
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Abstract
A video projection system using a light modulating display device having a row and column matrix of picture elements is improved by imparting an oscillatory motion to the display image in the plane of the image, to thereby reduce the visibility of the individual picture elements of the matrix. The resolution of the image can be increased by displaying different video information at different parts of the oscillatory cycle.
Claims7
A projection system having at least one illuminating beam of light and comprising:
- (a) at least one display device located in the path of the beam and having a row and column matrix of individual picture display elements capable of displaying picture information by modulating the beam in response to a display signal;
- and
- (b) means for focusing the modulated beam into a display image comprised of a matrix of individual pixels, and for projecting the image onto a display screen;
- the projection system including means for causing the projected image to oscillate in the plane of the image;
- the display device being illuminated by a prism illuminator comprising a pair of prisms separated by an air gap, and the means for causing the projected image to oscillate comprising means for imparting an oscillatory motion to at least one of the prisms, to result in an oscillatory change in the width of the air gap, whereby the perception of individual pixels is reduced.
2 more elements
Dependencies are inferred from the claim text.