Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-10-01
1992-04-07
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
313336, H01J 2970, H01J 2972
Patent
active
051031442
ABSTRACT:
An apparatus is disposed for controlling the brightness of a matrix-addressed flat panel CRT display of a type having intersecting column and row conductors forming, respectively, the gate and cathode electrodes of a field electron emission array. The brightness control is effected by controlling both the duty cycle and the voltage applied to the drive lines of the intersecting conductors. A periodic staircase waveform having progressively increasing voltage steps is sequentially applied to the row conductors. The voltages at each of the steps are preferably selected to enable electron beam currents which provide brightness levels which are twice the brightness of the previous step. Binary-coded video brightness data are simultaneously applied to all of the column conductors. The combined voltages at the intersections of the selected conductors cause a sequence of electron emissions onto luminescing means which result in a corresponding sequence of illumination intervals. The human optic system integrates this illumination sequence into the selected brightness level. In addition, the overall brightness of the display is controlled by gating the waveforms on the conductors with a pulse train comprising a sequence of adjustable, uniform-width pulses.
REFERENCES:
patent: 3755704 (1973-08-01), Spindt et al.
patent: 3935500 (1976-01-01), Oess et al.
patent: 4857799 (1989-08-01), Spindt et al.
patent: 4904895 (1990-02-01), Tsukamoto et al.
patent: 5015912 (1991-05-01), Spindt et al.
Blum Theodore M.
Maginniss Christopher L.
Raytheon Company
Sharkansky Richard M.
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