Patent ID: 8077388

Claim:
A method for modifying the polarization of light, comprising: passing a linear-polarized light oriented in a first direction through a first converter containing (i) a first polarizing film having a transmission axis at about +45 degrees with respect to the first direction, and (ii) a second polarizing film having a transmission axis at about −45 degrees with respect to the first direction to create a first polarized light; passing the first polarized light through a second converter containing a third polarizing film having a transmission axis at about 90 degrees relative to the first direction to create a second polarized light; and passing the second polarized light through a third converter containing four polarizing films to create a third polarized light, each of the four polarizing films having a transmission axis at about 45 degrees with respect to the first direction and at an angle of about 90 degrees between the transmission axis of any adjacent polarizing film.