Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1991-12-20
1993-08-24
Oberley, Alvin E.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340716, 359 50, G02F 1133
Patent
active
052392937
ABSTRACT:
A method and apparatus for diminishing flicker of a liquid crystal display (LCD) by producing a variable temporal modulation of the fluorescent tubes providing rear illumination of the LCD matrix panel. Fluorescent tubes are placed in a sequence behind the panel, parallel to lines of pixels of the panel. A high frequency supply of each tube is modulated by a low frequency periodic pulse control signal, the chopping rate of which is modulated. The modulation in the chopping rate of each low frequency periodic pulse control signal is determined by corresponding control signal. The control signals, delivered by a generator, are T/M phase shifted between two consecutive control signals, T being the image refreshing period and M the number of tubes. The control signals are individually adjusted to cause a rear illumination substantially in phase opposition with a means optical transmission of a zone of pixels facing each tube.
REFERENCES:
patent: 4238793 (1980-12-01), Hochstrate
patent: 4529913 (1985-07-01), Brosillon
patent: 4824216 (1989-04-01), Perbet et al.
patent: 4958915 (1990-09-01), Okada et al.
Farnandez Kara
Oberley Alvin E.
Thomson - CSF
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