Patent ID: 6671004
Filing Date: 2003-12-30
Classification: H04N

Abstract:
A method for automatically determining a center of a projected image in a projection television display apparatus having a plurality of sensors located at edges of a projection screen, comprising the steps of:a) projecting a marker within said image from a tube to a first sensor location on said projection display screen; b) adjusting a deflection parameter of said tube to move said image and marker until detected by said first sensor, c) saving a first value of said deflection parameter related to said first sensor detecting said image; d) projecting said image and marker from said tube to a second sensor located at an opposite screen edge; e) adjusting said deflection parameter of said tube to move said image and marker until detected by said second sensor; f) saving a second value of said deflection parameter related to said second sensor detecting said image; g) determining said center of said projected image with said first and second values.