Digital apparatus for convergence correction

Details Digital apparatus for convergence correction Digital apparatus for convergence correction

1986-06-04

1988-06-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315368, 358 11, H01J 2970, H01J 2972, H04N 1120

Patent

active

047542047

ABSTRACT:
Digital apparatus for convergence correction of a plurality of images on the screen of a television monitor includes a digital registration circuit, or an analog registration circuit using a digital attenuator; and a memory for storing data for operation of the digital registration circuit or the digital attenuator of the analog registration circuit. The memory has a plurality of pages, and the correction data corresponding to different operating conditions is stored in the respective pages of the memory. The paging of this memory is performed in accordance with the operating conditions, and the convergence correction is carried out on the basis of the correction data continuously read out of the designated page. With this apparatus, accurate convergence adjustment can be simply performed to accommodate changes in size and/or shape of the image displayed on the screen or monitor, changes in the distance of a projection screen from its projector, and changes in the screen surface, i.e., flat, concave, cyindrical, etc.

REFERENCES:
patent: 3714496 (1973-01-01), Horvath
patent: 4401922 (1983-08-01), Kamata et al.

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