Patent ID: 6593985
Filing Date: 2003-07-15
Classification: G02F

Abstract:
A color shutter, comprising:first, second and third polarizers polarizing the incident light over the entire region of visible wavelengths and arranged in the order mentioned as viewed from the side of the incident light; first and second retarders each having a plurality of birefringent layers; first and second polarizing rotators changing the angle of rotation of the polarizing plane by application of a voltage over the entire region of visible wavelengths of the incident light; and at least one absorption type partial polarizer converting the incident light into a polarized light by absorbing a part of wavelength regions of the incident light, wherein said first retarder is arranged between said first polarizer and said second polarizer; said second retarder is arranged between said second polarizer and said third polarizer; said first polarizing rotator is arranged between said first polarizer and said second polarizer; said second polarizing rotator is arranged between said second polarizer and said third polarizer; at least one of the first polarizing rotator and the second polarizing rotator is arranged in a manner to be sandwiched between the second polarizer and the first or second retarder; said absorption type partial polarizer is arranged between the first polarizing rotator and the first retarder and/or between the second polarizing rotator and the second retarder; and a transmitted light can be changed into three primary colors of RGB by selecting the voltage applied to the first and second polarizing rotators.