Patent ID: 7333157

Claim:
An image display device comprising: a first TN liquid crystal modulator for modulating the polarization state of a first colored light; a second TN liquid crystal modulator for modulating the polarization state of a second colored light which has a shorter wavelength than the first colored light; a third TN liquid crystal modulator for modulating the polarization state of a third colored light which has a shorter wavelength than the second colored light; and an optical system for synthesizing the image light which is emitted from the three liquid crystal modulators, wherein a first voltage is applied to the first liquid crystal modulator for providing the first colored light with about a half-wavelength phase difference, and wherein a second voltage which is higher than the first voltage is applied to the second liquid crystal modulator for providing the second colored light with about a half-wavelength phase difference, and wherein a third voltage which is higher than the second voltage is applied to the third liquid crystal modulator for providing the third colored light with about a half-wavelength phase difference.