Autoconvergence of a cathode ray tube using a semiconductor dete

Details Autoconvergence of a cathode ray tube using a semiconductor dete Autoconvergence of a cathode ray tube using a semiconductor dete

1984-12-24

1986-10-14

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

358 69, 315368, H01J 3126

Patent

active

046174958

ABSTRACT:
A CRT calibration system is provided having a CRT with a display screen, an electron gun system, and a plurality of feedback elements. Each feedback element has an active area disposed proximately to the display screen at a preselected location such that an electron beam from the electron gun system can strike at least a portion of the active area. In response to being struck by electrons, each feedback element provides a feedback signal related to the area of the portion struck. The system also includes a detector system for detecting each feedback signal, and an integrating analog-to-analog converter which, in response, provides a digital signal related to the portion of the active area struck and thereby to the position of the electron beam relative to the particular feedback element interrogated. Also included is a control system for directing the electron beam to strike a sequence of portions of the active area for each feedback element, thereby evoking a corresponding sequence of feedback signals for each feedback element and a corresponding sequence of digital signals, enabling the control system to determine the location of each feedback element.

REFERENCES:
patent: 4456853 (1984-06-01), Robinder et al.

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