The potential of multiwave interference phenomena for display applicat
ions is discussed. It is aimed at the realization of polarizer and col
or-filter-free flat-panel displays on the basis of liquid crystal disp
lay technologies. It is shown that the system of even thick optical re
sonators 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 interference phenomena i
n cholesteric liquid crystals allow for new display principles-through
effective redistribution of polarization states over the frequency sp
ectrum. It is emphasized that this distribution is an important charac
teristic of wide-spectrum sources determining the state of radiation a
long with coherence matrix and correlation function.