Enhanced MTBF backlight system and related method

Details Enhanced MTBF backlight system and related method Enhanced MTBF backlight system and related method

1998-10-29

2000-08-08

Spyrou, Cassandra

Illumination

Light source and modifier

Condition responsive

362277, 362 31, 362 32, 362 33, 359 48, 359599, F21V 800

Patent

active

060991453

ABSTRACT:
A first backlight light source is energized either at full or reduced rated power, until such time as the brightness which can be produced has reduced by a predetermined amount (e.g. half of the original level). A second or backup source is then switched on while the first is temporarily switched off. When the backup light source has degraded to the point where the brightness which can be produced by this light source has reduced by a second predetermined amount (which is the same as the first predetermined amount, e.g. 50%) the first light source is switched back on so that both are simultaneously energized. When this measure fails to maintain the required level of brightness, the power with which the light sources are energized is increased.

REFERENCES:
patent: 5053929 (1991-10-01), Le Gars
patent: 5089943 (1992-02-01), Wolfelschneider
patent: 5479275 (1995-12-01), Abileah
patent: 5537296 (1996-07-01), Kimura et al.
patent: 5555160 (1996-09-01), Tawara et al.
patent: 5619402 (1997-04-01), Liu
patent: 5664873 (1997-09-01), Kanda et al.
patent: 5673128 (1997-09-01), Ohta et al.

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