Optical correlation by use of partial phase-only modulation with VGA liquid-crystal displays

The development of liquid-crystal panels for use in commercial equipment ha s been aimed at improving the pixel resolution and the display efficiency. These improvements have led to a reduction in the thickness of such devices , among other outcomes, that involves a loss in phase modulation. We propos e a modification of the classical phase-only filter to permit displays in V GA liquid-crystal panels with a constant amplitude modulation and less than a 2 pi phase modulation. The method was tested experimentally in an optica l setup. (C) 2000 Optical Society of America.