Roping and moire reduction in patterned screen cathode ray tube

Details Roping and moire reduction in patterned screen cathode ray tube Roping and moire reduction in patterned screen cathode ray tube

1981-09-28

1983-10-18

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 31R, 358161, H01J 2958

Patent

active

044108419

ABSTRACT:
In a patterned screen color cathode ray tube (CRT) display, for example, a shadow-mask type color CRT, particularly for use under a wide range of ambient light conditions, such as an aircraft cockpit, incompatibilities between the screen pattern character, the type of writing (such as stroke and raster), and the display linewidth, may result in stroke written lines which appear as a twisted fiber rope and in raster written areas which appear wavy or watery; that is, a moire appearance. Both of these effects vary in accordance with the required display brightness over the ambient light range due to variations in beam or linewidth with corresponding variations in the required cathode drive voltages. These undesirable roping and moire effects are eliminated or substantially eliminated by varying the electron beam focus in accordance with a computed reference brightness compatible with the range of ambient brightnesses in a manner to maintain a predetermined, substantially fixed beam width for stroke written symbols and effective line spacing for raster written symbols.

REFERENCES:
patent: 3814852 (1974-06-01), Mierzwinski
patent: 4037133 (1977-07-01), Sennik
patent: 4105912 (1978-08-01), Senger

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