Portable projection display apparatus

Details Portable projection display apparatus Portable projection display apparatus

1995-06-05

1998-04-14

Dowling, William

Optics: image projectors

Miscellaneous

353 42, G03B 2114

Patent

active

057384290

ABSTRACT:
The present projection display apparatus includes an illumination source, an LCD panel including a polarizing plate, a light projecting and receiving combinational lens, a screen, a light pen, a detection-use polarizing plate, a CCD, and a control circuit for controlling an operation of the LCD panel upon receiving a signal from the CCD. The combinational lens throws light of a display image from the LCD panel to project the light on the screen. Meanwhile, the lens receives light from the display image and luminescent spot light from the pen to focus them on the LCD panel and then reflect the same to make them incident on the CCD via the detection-use polarizing plate. The detection-use polarizing plate does not transmit the light of the display image.

REFERENCES:
patent: 4808980 (1989-02-01), Drumm
patent: 4846694 (1989-07-01), Erhardt
patent: 4953971 (1990-09-01), Highfill
patent: 5114224 (1992-05-01), Miyamoto et al.
patent: 5235363 (1993-08-01), Vogeley et al.
patent: 5400095 (1995-03-01), Minich et al.
patent: 5422693 (1995-06-01), Vogeley et al.

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