Patent ID: 7497576

Claim:
A projection display, comprising: a light source configured to generate a light; a color separation unit configured to split the light into R, G and B lights, wherein the color separation unit comprises one of a color drum and a rotational prism; an illumination lens array configured to condense the R, G and B lights; a display panel configured to display an image corresponding to the R, G and B lights respectively; a phase plate device including at least one of a first phase plate provided between the color separation unit and the illumination lens array and a second phase plate provided between the illumination lens array and the display panel, the phase plate device configured to convert a polarized form of an incident light; and a first linear polarizer provided between the phase plate device and the display panel and configured to transmit a specific-directional linearly polarized light of the incident light converted by the phase plate device, wherein the phase plate device is configured to circularly polarize the incident light if the incident light is linearly polarized or to linearly polarize the incident light if the incident light is circularly polarized.