Back to results
US 4,792,733 AGranted
Cathode ray tube display arrangements
AssigneeGEC Avionics Limited
InventorMartin W. Redfern
Life of this patent
Estimating the term…
Abstract
A cathode ray tube (CRT) display arrangement including protection means for protecting the screen of the CRT (1) against excessive heating, by the electron beam, e.g. due to failure of the beam deflection drive circuits (5), the protection means comprising an electronic storage means (27 to 41) having storage locations in which are stored values indicative of the temperature at different locations on the CRT screen, and means (7) for controlling the electron beam current in dependence on the contents of the storage means.
Claims12
A CRT display arrangement comprising:
- a CRT;
- deflection means for deflecting an electron beam produced by an electron gun of the CRT across a display screen of the CRT;
- electronic storage means having a respective storage location for each of a plurality of discrete portions of a display area of the CRT screen;
- means for storing in each said storage location a value indicative of the temperature in the corresponding portion of said display area due to impact thereon of said electron beam;
- and means for controlling the electron beam in dependence on the contents of said storage means so as to prevent excessive heating of a said portion of the display screen.
2 more elements
Dependencies are inferred from the claim text.