Patent ID: 7048380
Filing Date: 2006-05-23
Classification: G03B

Abstract:
1. A projection apparatus comprising: an illumination system to emit white light having light of a predetermined wavelength band; a polarization conversion system, to convert the light of the predetermined wavelength band to a first polarization component; a color recycling system to separate the light of the predetermined wavelength band into a first color light and a second color light, transmit and reflect the first and second color lights, to convert a third color light to have a second polarization component, and transmit the third color light so that a fourth color light, that is a mixture of the first and third color lights, and a fifth color light, that is a mixture of the second and third color lights, progress in different optical paths; an image forming system comprising a first reflective panel and a second reflective panel, which respectively modulate the first and second color lights according to an applied image signal, and a third reflective panel, which modulates the third color light according to the applied image signal; a screen to receive the first through third color lights modulated by the image forming system and projected thereon and display an image; an optical path conversion system, to split the optical paths of the fourth and fifth color lights incident from the color recycling system such that the first color light in the fourth color light is directed to the first reflective panel, the second color light in the fifth color light is directed to the second reflective panel, and the third color light in the fourth and fifth color light is directed to the third reflective panel, and direct the first through third color lights reflected from the respective first through third reflective panels to the screen; and a projection system comprising a projection lens, which projects the fourth color light output from the optical path conversion system and the fifth color light output from the optical path conversion system on the screen.