Patent ID: 7993047
Filing Date: 2011-08-09
Classification: G02F,H01J

Abstract:
1. A direct type backlight unit comprising: a plurality of U-shaped lamps arranged in two columns, wherein curved portions of two opposite U-shaped lamps are symmetrically positioned in the center of a display area, and the curved portion of any one of the two U-shaped lamps has a non-luminous portion, so as to provide a uniform luminance across the plurality of U-shaped lamps, wherein a fluorescent substance is not coated on the non-luminous portion in the curved portion of the U-shaped lamp, wherein a spacing interval between the curved portions of the opposite U-shaped lamps is smaller than a width of the non-luminous portion, wherein a diameter of each of the U-shaped lamps is to 4 mm, wherein optical sheets are provided above the U-shaped lamps, wherein the optical sheets are formed of a light-diffusion sheet, a prism sheet and a protection sheet, wherein a reflective sheet is provided below the U-shaped lamps, and wherein a case is provided for receiving and fixing the U-shaped lamps, the optical sheets, and the reflective sheet; wherein a width of the non-luminous portion is 5 mm; and wherein the curved portions of the opposite U-shaped lamps are symmetrically maintained at a spacing interval of 1 mm.