High resolution, high density CRT monitor

Details High resolution, high density CRT monitor High resolution, high density CRT monitor

1981-05-07

1982-08-17

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315384, H01J 2970, H01J 2976

Patent

active

043451870

ABSTRACT:
A high performance cathode ray tube (CRT) display monitor is capable of operating at a rate of 50,000 horizontal scans per second. The monitor receives vertical sync, horizontal blank, and video input signals. The vertical sync signal is supplied to an integrated circuit vertical deflection system which produces vertical deflection signals (for the vertical yoke) and vertical blank signals. The horizontal blank signal is supplied to an integrated circuit phase lock loop which includes a phase comparator and a voltage controlled oscillator (VCO). The output of the VCO is amplified to produce horizontal deflection signal pulses (for the horizontal yoke). The horizontal retrace signal pulses are supplied to a comparator input of the phase lock loop, and are compared with the horizontal blank signal. The output of the phase comparator is filtered by a low pass filter and supplied to the input of the VCO, thereby controlling the VCO to lock the horizontal deflection signal pulse frequency to the frequency of the horizontal blank input signal. The horizontal retrace signal pulses are also coupled through a transformer to the base of a transistor where they are summed with the vertical blank signals to control switching of the transistor and thus produce blanking signals for the CRT.

REFERENCES:
patent: 4096415 (1980-12-01), Haferl

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