METHOD FOR MANUFACTURING DIRECT BACKLIGHT UNIT, HOT-CATHODE FLUORESCENT LAMP, BACKLIGHT UNIT, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PPROBLEM TO BE SOLVED: To discriminate the direction of a fluorescent lamp, in a method for manufacturing a direct backlight unit wherein adjacent fluorescent lamps are alternately arranged. PSOLUTION: In a preparation step in this method for manufacturing the backlight unit, a plurality of fluorescent lamps are prepared. In the fluorescent lamps, a length a1 from a first sealing section end portion of a glass bulb 26 to an area where a fluorescent layer 32 does not exist is smaller than a length a2 from a second sealing section side to an area where the fluorescent layer 32 does not exist (a1a2). In a detection step, such difference between the lengths is detected by using a sensor, and in an arrangement step, the fluorescent lamps are arranged in a housing so that the end portion sides are alternately arranged on the same side, by using the detection results. PCOPYRIGHT: (C)2009,JPO&INPIT