Communications: electrical – Systems – With specific power supply
Patent
1975-08-08
1977-12-13
Curtis, Marshall M.
Communications: electrical
Systems
With specific power supply
340340, 358240, G09F 932
Patent
active
040632342
ABSTRACT:
A memory and driver circuit for each lamp of a flat screen video display apparatus which comprises a plurality of addressable incandescent lamps arranged in an X-Y matrix is provided. The gray scale visual effect of the video information being presented comes as a result of controlling the length of time of illumination of each lamp. Each of the lamps is connected in series with a source of power and a switchable solid state device such as an SCR or a transistor. When the source of power is an alternating current source where each of the pulses has its initial slope always in the same sense with respect to zero, the circuit is arranged with negative-going video information so that the lamps are held off -- i.e., black -- in the presence of a video signal above a threshold, and are thereafter turned on. Phase modulation is thereby provided. When the source of power is direct current, each lamp is illuminated when there is a video signal intended for that lamp and above a predetermined reference level. Pulse width modulation is provided in this case.
REFERENCES:
patent: 3273140 (1966-09-01), Foster et al.
patent: 3761617 (1973-09-01), Tsuchiya et al.
patent: 3845243 (1974-10-01), Schmersal et al.
patent: 3883778 (1975-05-01), Kaji et al.
Arn Robert M.
Waszek Glen F.
Curtis Marshall M.
Hewson Donald E.
LandOfFree
Incandescent, flat screen, video display does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Incandescent, flat screen, video display, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Incandescent, flat screen, video display will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-492007