Automatic convergence and gray scale correction for television _

Details Automatic convergence and gray scale correction for television _ Automatic convergence and gray scale correction for television _

1982-09-27

1984-11-27

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

558139, H04N 962

Patent

active

044853947

ABSTRACT:
A system for the automatic correction of convergence and gray scale in color television employs light sensors, either singly or in an array, on the beam landing face of a cathode ray tube or on the screen of a projection receiver. The sensors can be placed in the overscanned area of the raster, such that they are outside the normal viewing area, or in the viewing area if the sensors are made sufficiently small. In the vicinity of a sensor, two of the three cathode ray tubes or electron guns are blanked. As the light beam, in the case of a projection system, crosses the sensor, an output is produced. This output is processed to obtain accurate timing characteristics. Since the position of the sensor is known in terms of counts in both the vertical and horizontal directions, error signals can be developed by comparing the timing of the sensor output with the proper count. These error signals are used to develop vertical and horizontal correction signals to correct the convergence of the one cathode ray tube or gun. The process is then repeated for the remaining two cathode ray tubes or guns. The output of the sensor is also amplified by gated amplifiers for each of the cathode ray tubes or guns in sequential order, and the outputs of these amplifiers are compared to a preset value to develop error signals. These error signals are used to set gun drives to correct the gray scale.

REFERENCES:
patent: 2954424 (1960-09-01), Thiele
patent: 3479448 (1969-11-01), Kollsman
patent: 3962722 (1976-06-01), Ciciora
patent: 4001877 (1977-01-01), Simpson
patent: 4035834 (1977-07-01), Drury
patent: 4277797 (1981-07-01), Dangschat
patent: 4364079 (1982-12-01), Pons

Affiliated with

Also associated with

Rating

Automatic convergence and gray scale correction for television _ does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic convergence and gray scale correction for television _, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic convergence and gray scale correction for television _ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2136927