JP2003241144A5 - - Google Patents

Claims (2)

First polarization separation means and second polarization separation means arranged in a diagonal direction;
A third polarization separation means and a fourth polarization separation means arranged in a diagonal direction orthogonal to the diagonal direction;
When the first polarization separation unit is disposed on the light incident side and the second polarization separation unit is disposed on the output side, the light incident side of the first polarization separation unit and the first to fourth polarization separations Wavelength which is disposed between two or more inner facing surfaces among the inner facing surfaces of the means and rotates the polarization plane of predetermined three primary color light incident from the light incident side of the first polarization separation means by 90 ° And a selectivity conversion means.
The first, third and fourth polarization separation means are plate-like wire grid polarization separation plates, and the fourth polarization separation means is a polarization beam splitter. . The color separation / synthesis optical system according to claim 1 is provided, and a light incident side of the first polarization separation means of the color separation / synthesis optical system includes a light source and predetermined linearly polarized light out of indefinite polarization emitted from the light source. A first polarizing means that transmits only the light,
On the light exit side of the second polarization separation means, a second polarization means that transmits only predetermined linearly polarized light and a projection lens are provided,
Outside the third polarization separation means, a first spatial light modulation element that reflects the light after modulating the predetermined linearly polarized light that has passed through the third polarization separation means, and the fourth polarization separation On the outer surface of the means, the predetermined linearly polarized light reflected by the fourth polarization separation means is optically modulated, and then the second spatial light modulation element to be reflected and the fourth polarization separation means are passed. A projection display device, comprising: a third spatial light modulator that reflects light after modulating the predetermined linearly polarized light.