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TFT Backlight (Customized On Demand)
LED Backlight
Light Emitting Diode (LED): LED backlights are used primarily for
character modules. They offer a longer operating life - 50,000
hours minimum - and are brighter than Els. They do consume more
power than Els. Being a solid state device, they operate directly
off +5 VDC, so they do not require an inverter. However, a current
limiting resistor is recommended for protection of the LEDs. LEDs
are mounted in an array directly behind the display, which
increases the thickness 4 to 5 mm. LEDs come in a variety of
colors, with yellow-green being the most common.
Cold Cathode Fluorescent Lamp (CCFL): CCFL backlight offers low
power consumption and a very bright white light . Two technologies
are used: direct an edge lighting. In both types a cold cathode
fluorescent tube is the light source. A diffuser distributes the
light evenly across the viewing area. Edge lighting offers a
thinner package and less power. CCFLs require an inverter to supply
the 270 to 300 VAC used by the CCFL tube. They are used primarily
in graphic LCDs and have a longer life - 10,000 to 15,000 hours -
than Els do.