Patent ID: 7333130

Claim:
An apparatus of automatically re-adjusting convergence of a projection TV, the apparatus comprising: a display device, on which an image is projected; at least one light-sensing element being provided around said display device said light-sensing element being composed of first and second sub-sensors that generate separate output signals as a projected alignment pattern moves over said sub-sensors; a microprocessor calculating a convergence re-adjustment vector by obtaining a location of said light-sensing element, from which a previous convergence correction was made, said location of light-sensing element being obtained by analyzing said output signals; a comparative part providing an informative signal to said microprocessor, said informative signal indicating T horizontal and T vertical which represent each time at which said output signals cross each other as said projected alignment moves over said sub-sensors in a horizontal direction and a vertical direction, respectively; and a memory storing said obtained location of said light-sensing element.