CATHODE RAY TUBE DISPLAY DEVICE

摘要

A display device which is corrected for vibration, for example between screen (4) and the electron gun (2) in a C.R.T. (1). The device comprises an optical system (6) on the observer side of the screen (4) for directing the light from a small part of the screen (9), onto which the electron beam is directed at intervals, onto a photocell (10) which detects the position of the light spot. The output signal from the photocell is processed in a circuit (5) to provide a correction signal which is applied to the deflection system (3) of the C.R.T. to reduce the deviation of the light spot from the position it would have in a vibration-free environment.