Optical illumination apparatus for a display unit with efficient

Details Optical illumination apparatus for a display unit with efficient Optical illumination apparatus for a display unit with efficient

1992-08-10

1994-04-05

Powell, Mark R.

Television

Video display

Projection device

348761, 348765, 348782, H04N 574, H04N 931

Patent

active

053010302

ABSTRACT:
An optical irradiating apparatus for use in a display unit and an optical irradiating method thereof is disclosed. The apparatus includes an optical source lamp, a polarizer secured within a polarized light transducer and for separating light rays incoming from the optical source lamp, and an optical/video converting device for converting the reflected light rays (reflected by the polarizer) to video signals. The light rays which have undergone the above procedure pass through an optical irradiating lens, and then, are sent to a screen. The optical irradiating apparatus further includes first and second reflecting mirrors installed respectively above and below the polarizer within the optical polarizing device and for reflecting the light rays passed through the polarizer, and a .lambda./4 plate installed on the surface of the second reflecting mirror and for polarizing the light rays (reflected from the first reflecting mirror) to the same component as that of the initial reflected light rays. In response to present invention, the light rays passed through the polarizer can be utilized, and therefore, the optical efficiency can be improved by about 80-90% over that of the conventional technique.

REFERENCES:
patent: 4913529 (1990-04-01), Goldenberg et al.
patent: 5042921 (1991-08-01), Sato et al.

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