LCD pixel shape and far-field diffraction patterns

The shape and diffraction pattern of a liquid crystal display (LCD) pixel used in a point-diffraction interferometer is qualitatively evaluated using the experimental diffraction patterns of computer-generated apertures. The diffraction patterns for apertures with contours between a circle and a square were numerically plotted from analytical expressions of these topological forms. The observed patterns are qualitatively in accordance with previous calculations of such apertures using scalar diffraction theory in the far field.