KR950027447A - Projection Image Display Device Using Polarization Separator - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection image display device, comprising: a light source for emitting white light having high brightness, a source stopper for making the white light into a predetermined shape through a hole, and polarizing and separating the small white light into P and S waves, A polarization separator which vertically reflects white light having a wave and passes the white light having the S wave, and passes the S wave which is modulated in the opposite direction by passing the white light having the S wave, and a P wave reflected by the polarization separator. Λ / 4 plate which circularly polarizes the white light having a circular polarization but passes it back and forth and rotates by 90 ° to modulate the linearly polarized light into the white light having the S wave, and the white light having the P wave circularly polarized into red, green and blue light. An optical splitter configured to adjust the optical paths of the red, green, and blue light by unit pixels and reflect the light paths; A projection stopper for forming color light having an adjusted S-wave and passing an amount of light proportional to the degree of adjustment of the optical path through the hole, and a field lens system for imaging the reflected light proximate to the optical path controller without loss to the projection stopper; And a projection lens for projecting the color light passing through the hole of the projection stopper onto the screen. Accordingly, the size of the field lenses can be reduced, so that the optical system can be reduced, so that the size of the system can be reduced, and the luminance contrast can be improved since the light is transmitted through the projection stopper when the actuators are not driven.

Description

Projection Image Display Device Using Polarization Separator

Since this is an open matter, no full text was included.

1 is a schematic view of a conventional projection image display device;

2 is a plan view schematically showing a projection image display apparatus using a polarization separator according to the present invention.

Claims (3)

The first phase wave by polarizing and separating a light source emitting high brightness white light, a source stopper for making the white light into a predetermined shape through a hole, and the first and second phase waves having a 90 ° phase difference. A polarization splitter that vertically reflects white light having a shape and passes the white light having the second phase wave, and passes the second phase wave that is converted in the first direction without reflection and passes through the second phase wave without reflection; Λ / 4 plate for circularly polarizing the white light having the reflected first phase wave and passing it back and forth to modulate the linearly rotated 90 ° to the second phase wave, and the white light in which the first phase wave is circularly polarized. And an optical splitter for separating the blue light into light, an optical path adjuster for reflecting the red, green, and blue light by adjusting the optical path for each unit pixel. A projection stopper for forming a color light having the second phase wave cut out and passing an amount of light proportional to the degree of adjustment of the optical path through the hole; and a field lens system for imaging the reflected light proximate to the optical path controller without loss on the projection stopper. And a projection lens for projecting the color light passing through the hole of the projection stopper onto the screen. The projection image display device according to claim 1, further comprising a source lens for focusing light emitted between the light source and the source stopper. The projection image display device according to claim 1, wherein the first and second phase waves are P waves and S waves. ※ Note: The disclosure is based on the initial application.