Patent ID: 6219011
Filing Date: 2001-04-17
Classification: G06F,G09G,H04N

Abstract:
Electro-optical display apparatus, comprising:a plurality of modular units each including a projector for receiving electrical signals, converting them to optical images, and projecting said optical images via an optical projection system onto a screen;said plurality of modular units being arranged in a side-by-side array such as to produce a combined display on said screen;said apparatus further comprising a calibration system including an image sensor for sensing an optical image on said screen, and imaging means spaced from the screen and producing an image of the screen on said image sensor, for detecting geometrical distortions in said combined display caused by said projection system of each modular unit and for modifying the electrical signals applied to said projector of each modular unit to correct said combined display with respect to said detected geometrical distortions;said image sensor and imaging means being located on the same side of the screen as the projectors for the plurality of modular units;said calibration system further including a two-dimensional array of reference points of known locations on the face of said screen, and means for generating a projector-path correction table for each modular unit for correcting discrepancies between the known locations of said two-dimensional array of reference points on said screen and the corresponding locations of the two-dimensional array of reference points as projected on said screen.