FLUORESCENT LAMP, BACKLIGHT UNIT, AND LIQUID CRYSTAL DISPLAY

摘要

PROBLEM TO BE SOLVED: To distinguish a direction of a fluorescent lamp in a manufacturing method of a direct-down type backlight unit wherein adjacent fluorescent lamps are alternately arranged.

SOLUTION: In a fluorescent lamp including a glass bulb 26, electrodes fitted inside both ends of the glass bulb 26, lead wires connected to the electrodes and drawn outside from both ends of the glass bulb, and a phosphor layer formed on an inner face other than the both ends of the glass bulb, the lead wires are made of kovar or molybdenum, a thermal expansion coefficient of the glass bulb is 45×10-7[K-1] to 56×10-7[K-1], and a length of a phosphor-layer-non-existant area extending from one end of the glass bulb and a length of a phosphor-layer-non-existant area extending from the other end of the glass bulb are as much different as can be distinguished by a sensor.

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