Incandescent matrix display with high frequency lamp driving

Details Incandescent matrix display with high frequency lamp driving Incandescent matrix display with high frequency lamp driving

1988-05-27

1990-01-16

Groody, James J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

358240, 315161, 315316, 315317, G09F 932, H04N 312

Patent

active

048946451

ABSTRACT:
The present invention relates to an electronic sign with a number of light bulbs provided in rows and columns (so called matrix), whereby said bulbs (L) are turned on row by row or column by column (so called multiplex operation). For increasing the life of the bulbs (L), said bulbs (L) are operated by alternating current at high frequency.

REFERENCES:
patent: 4063234 (1977-12-01), Arn et al.
patent: 4283659 (1981-08-01), Beckerman et al.
patent: 4488090 (1984-12-01), Hancock
patent: 4559480 (1985-12-01), Nobs
patent: 4688154 (1987-08-01), Nilssen
patent: 4745537 (1988-05-01), Cheung
patent: 4771278 (1988-09-01), Pooley
patent: 4820956 (1989-04-01), Slobodzian et al.

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