Fade
Fading is sometimes a problem with VFD displays. Light output drops over time due to falling emission and reduction of phosphor efficiency. How quickly and how far this falls depends on the construction and operation of the VFD. In some equipment, loss of VFD output can render the equipment inoperable.
Emission may usually be restored by raising filament voltage. Thirty-three percent voltage boost can rectify moderate fade, and 66% boost severe fade. This can make the filaments visible in use, though the usual green-blue VFD filter helps reduce any such red or orange light from the filament.
Read more about this topic: Vacuum Fluorescent Display
Famous quotes containing the word fade:
“Logic and hope fade somewhat by thirty-six, when endings seem more like clear warnings than useful experience.”
—Jane O’Reilly, U.S. feminist and humorist. The Girl I Left Behind, ch. 2 (1980)
“One by one they appear in
the darkness: a few friends, and
a few with historical
names. How late they start to shine!
but before they fade they stand
perfectly embodied,”
—Thom Gunn (b. 1929)
“For the most part we think that there are few degrees of sublimity, and that the highest is but little higher than that which we now behold; but we are always deceived. Sublimer visions appear, and the former pale and fade away.”
—Henry David Thoreau (1817–1862)