A method for illuminating a liquid crystal display device, a back-light
assembly for performing the same and a liquid crystal display device
using the same can improve the front luminance and production yield.
Lights from a lamp is incident to a LCD panel side, which are then
primarily diffused for a uniformity of the luminous flux of the incident
lights. The luminous flux of the primarily diffused lights is condensed
with respect to a first orientation component on a plane in parallel with
the LCD panel, and then partially and secondarily diffused for extending
a view angle of pixels of the LCD panel. After the luminous flux of the
secondarily diffused lights is condensed with respect to a second
orientation component perpendicular to the first orientation on the
parallel plane, the condensed lights are illuminated onto the LCD panel.
A diffusion sheet for secondarily diffusing the luminous flux and a
condensing sheet for condensing the second orientation component are
formed by a single sheet to reduce the manufacturing process of the
liquid crystal display device. Also, a defect produced from respective
sheets is minimized to enhance the yield.