Liquid crystal projector device

A liquid crystal projector device, which projects an image having been modulated with a liquid crystal element on a screen, comprising:

• first to fourth polarization beam splitters;
• first and second half-wave plates;
• and
• first and second liquid crystal elements,
• said first polarization beam splitter separating a green light entering therein into a first and second green lights perpendicular to each other,
• said first liquid crystal element modulating the first green light,
• said second polarization beam splitter reflecting the first green light having been separated by the first polarization beam splitter to be directed to the first liquid crystal element, and transmitting the first green light having been modulated by the first liquid crystal element,
• said first half-wave plane revolving the polarization plane of the second green light separated by the first polarization beam splitter at 90 degree,
• said second liquid crystal element modulating the second green light,
• said third polarization beam splitter reflecting the second green light from the second half-wave plate to be directed to the second liquid crystal element and transmitting the second green light having been modulated by the second liquid crystal element,
• said second half-wave plane revolving the polarization plane of the second green light transmitted through the third polarization beam splitter at 90 degree, and
• said fourth polarization beam splitter transmitting the first green light having been transmitted through the second polarization beam splitter, and reflecting the second green light from the second half wave-plate.