Correction device for convergence error of projection type display device

Abstract

Abstract PURPOSE:To easily correct a convergence on a projection screen by detecting the image which is not formed on an auxiliary screen by a detector and obtaining the convergence error information of this image from the calculation of the allowable value of a matrix center of gravity. CONSTITUTION:A waveform H (x, y) on the auxiliary screen 6 is picked up by an image pickup device 9, a picture processor 10 is used to calculate an error value in the center of gravity and to obtain the information of a convergence error on the screen 6. In such a manner, the obtained error information on the screen 6 is stored, and used as reference data. Then, under the condition to which the relative positions of projectors 2, 3, 4, the projection screen 5 and the screen 6 are fixed, when the center of gravity error value is calculated by the screen 6 is calculated and the convergence error is detected, it is understood that there is the error on the screen 5 if it is dislocated from the error information, so that it can be corrected.

Inventors

• 👤 Masaru Kanazawa
• 👤 金沢　勝
• 👤 Junji Kumada
• 👤 純二 熊田
• 👤 Fumio Okano
• 👤 文男 岡野

Bibliographic Details