Backlight unit and liquid crystal display device using the same
View Patent ↗A backlight unit includes: at least one lamp; and a plurality of optical sheets on the at least one lamp, the plurality of optical sheets having a micro-lens sheet.
1. A backlight unit, comprising:
at least one lamp; and
a plurality of optical sheets over the at least one lamp, the plurality of optical sheets
having a micro-lens sheet, wherein the micro-lens sheet includes a plurality of convex lenses and each of the plurality of convex lenses has a cross shape, and wherein facing end portions of two convex lenses are spaced apart from each other, wherein the two convex lenses are adjacent to each other along a direction, and a reference line connecting the facing end portions is parallel to the direction, and wherein a space between the facing end portions has a flat surface.
2. The backlight unit according to claim 1 , wherein each of the plurality of convex lenses includes a first semi-cylindrical lens and a second semi-cylindrical lens crossing the first semi-cylindrical lens.
3. The backlight unit according to claim 1 , wherein the plurality of convex lenses includes a first axis and a second axis shorter than the first axis, the first axis corresponds to a lengthwise direction of the at least one lamp.
4. The backlight unit according to claim 1 , wherein the backlight unit is a direct-type backlight unit.
5. The backlight unit according to claim 1 , wherein the micro-lens sheet is the top sheet of the plurality of optical sheets.
6. The backlight unit according to claim 1 , wherein the micro-lens sheet is formed of a transparent material.
7. The backlight unit according to claim 6 , wherein the transparent material is a synthetic resin.