Polarization conversion system

A polarization conversion system having an incident light angle-dependent limit defined at 45 degrees and a F/# of approximately F/1.8, comprising:

• a glass substrate;
• reflection type polarization plates, formed between top and bottom surfaces of the glass substrate and inclined at a predetermined angle, separating unpolarized incident light into two polarization directions where the two directions are at a right angle to each other;
• polarization conversion plates coupled to the reflection type polarization plates, converting a polarization direction of light polarized by the reflection type polarization plates;
• reflection plates positioned in parallel with the reflection type polarization plates, reflecting incident light from the reflection type polarization plates;
• wherein a light source optical system is constructed by arranging at a front end of the polarization conversion system a fly-eye lens array for uniformly splitting an incident light beam and simultaneously converging the split light beams and a lamp, and disposing a panel at a rear end of the polarization conversions system;
• wherein the fly-eye lens array and the polarization conversion system are arranged in such a manner that light emitted from the fly-eye lens array is imaged to be incident only on the portion of the polarization conversion system with the reflection type polarization plates and the polarization conversion plates,
• wherein each of the polarization conversion plates is formed on a top or bottom surface of each of the reflection type polarization plates;
• wherein the reflection type polarization plates and the polarization conversion plates are inclined at a same angle from a horizontal line;
• wherein the reflection plates are inclined at a same angle with the reflection type polarization plates from a horizontal line;
• and
• wherein each reflection type polarization plate is formed of a metal polarizer having a grating pattern thereon the achieve the incident light angle-dependent limit defined at 45 degrees and an F/# of approximately F/1.8.