The potential of multiwave interference phenomena for display applications is discussed. It is aimed at the realization of polarizer and color-filter-free flat-panel displays on the basis of liquid crystal display technologies. It is shown that the system of even thick optical resonators can be tuned so that large-scale selectivity (superspectrum) over the visible spectrum is achieved. Parameters of superspectra can be controlled electrically with the aid of intracavity electro-optical materials. Polarization effects of multiwave interterence phenomena in cholesteric liquid crystals allow for new display principles-through effective redistribution of polarization states over the frequency spectrum. It is emphasized that this distribution is an important characteristic of wide-spectrum sources determining the state of radiation along with coherence matrix and correlation function.