US 7,553,024 B2
Image display device
Satoshi Ouchi, Kamakura (Japan); Taro Imahase, Fujisawa (Japan); Tomohiro Miyoshi, Fujisawa (Japan); and Fukuyasu Abe, Yokohama (Japan)
Assigned to Hitachi, Ltd., Tokyo (Japan)
Filed on Apr. 12, 2006, as Appl. No. 11/401,922.
Application 11/401922 is a continuation of application No. 11/175177, filed on Jul. 07, 2005, granted, now 7,044,607.
Application 11/175177 is a continuation of application No. 10/638804, filed on Aug. 12, 2003, granted, now 6,926,411.
Application 10/638804 is a continuation of application No. 09/810571, filed on Mar. 19, 2001, granted, now 6,626,540.
Claims priority of application No. 2000-081774 (JP), filed on Mar. 17, 2000.
Prior Publication US 2006/0187416 A1, Aug. 24, 2006
Int. Cl. G03B 21/14 (2006.01)
U.S. Cl. 353—20  [353/34; 353/31; 349/9] 2 Claims
OG exemplary drawing
 
1. An image display device comprising:
a light source which outputs a first light including a first color light, a second color light and a third color light;
a polarity converter which unifies polarities of the first light into a single polarity;
a dichroic mirror which separates the first color light from the first light which is output by the polarity converter;
a first reflective liquid crystal display element installed for the first color light;
a second reflective liquid crystal display element installed for the second color light;
a third reflective liquid crystal display element installed for the third color light;
a first polarized beam splitter installed in front of a reflecting surface of the first reflective liquid crystal display element;
a second polarized beam splitter having an input surface inputting a second light in which the first color light is eliminated by separation, a separating and combining surface to separate the second color light and the third color light from the second light input through the input surface and to combine the second color light reflected by the second reflective liquid crystal display element installed for the second color light and the third color light reflected by the third reflective liquid crystal display element installed for the third color light, and an output surface to output a combined light;
a first wavelength selective polarity rotator element installed over the input surface of the second polarized beam splitter to rotate a polarity of one of the second color light and the third color light;
a second wavelength selective polarity rotator element installed over the output surface of the second polarized beam splitter to rotate a polarity of one of the second color light and the third color light included in the combined light;
a third polarized beam splitter to combine the first color light output from the first polarized beam splitter and the combined light which is output from the second wavelength selective polarity rotator element; and
a projection lens to project a third light combined by the third polarized beam splitter;
wherein the first color light reflected by the first reflective liquid crystal display element permeates the first polarized beam splitter and the third polarized beam splitter;
wherein the first color light is a green light; and
wherein a λ/4 wavelength plate is installed between the first polarized beam splitter and the first reflective liquid crystal display element installed for the first color light.