Projection display apparatus

Details Projection display apparatus Projection display apparatus

G - Physics

02

B

G02B 27/18 (2006.01) H04N 5/74 (2006.01) H04N 17/04 (2006.01) H04N 5/16 (2006.01) H04N 5/20 (2006.01) H04N 5/57 (2006.01) H04N 9/73 (2006.01) H04N 17/00 (2006.01)

Patent

CA 2357608

A projection display apparatus with a light source, a light valve and an optical system for projecting an image formed in an image-forming plane of the light valve onto a screen is disclosed. The projection display apparatus includes a first processor for calculating an area of an image projected onto the screen, a photometer for measuring illuminance in the neighborhood of the image projected onto the screen, a second processor for calculating a black-level correction value from the area of the image calculated by the first processor and the illuminance measured by the photometer, and a light-source-power controller for controlling power supplied to the light source on the basis of the black-level correction value calculated by the second processor.

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