Projector having a halfwave plate disposed in light-leaving side

Details Projector having a halfwave plate disposed in light-leaving side Projector having a halfwave plate disposed in light-leaving side

1994-08-31

1996-07-30

Metjahic, Safet

Television

Video display

Projection device

348757, 353 20, H04N 931

Patent

active

055416730

ABSTRACT:
In a projector comprising three image forming devices, disposed between a separation optical section and a combination optical section, for processing a red, a green, and a blue light beams, at least one of the three image forming devices comprises a polarization direction converting means, such as a halfwave plate for converting polarization direction for one of the red, the green, and the blue image light beams so that one of a color combining dichroic mirrors has a cutoff wavelength of spectral characteristic which shifts toward outside for one of the red, the green, and the blue central wavelengths from that of one of a color separating dichroic mirrors. The halfwave plate may be disposed in a light-leaving side of at least one of the three image forming devices.

REFERENCES:
patent: 5164821 (1992-11-01), Tanaka et al.
patent: 5237435 (1993-08-01), Kurematsu et al.
patent: 5267029 (1993-11-01), Kumematsu et al.
patent: 5374968 (1994-12-01), Haven et al.

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