Projection-type display apparatus and multiscreen display...

Details Projection-type display apparatus and multiscreen display... Projection-type display apparatus and multiscreen display...

2005-12-21

2009-06-09

Le, Bao-Luan (Department: 2851)

Optics: image projectors

Lamp control

Reexamination Certificate

active

07543944

ABSTRACT:
The projection type display apparatus according to the present invention includes a light source (20), display devices (29, 34, 42) for forming an optical image by demodulating light from the light source in response to a drive voltage, a projection lens (15) for enlarging and projecting the optical image on the display device, a detector (5) for detecting the light from the projection lens, and a control circuit (11) for controlling the drive control in response to an output from the detector. The detector is arranged at a position close to an external periphery of a light flux emitted from the projection lens, and detects a portion of light from the projection lens (diffuse light) reaching outside of an effective area of a screen.

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