The present invention provides a flat panel lighting system and a liquid crystal display device using the same. A laser beam ejected from a light source (30) is scattered in the direction parallel to The present invention provides a flat panel lighting system and a liquid crystal display device using the same. A laser beam ejected from a light source (30) is scattered in the direction parallel tothe main face of a light guide plate (9) by means of a one-dimensional scattering element (5). The scattered laser beam is transformed into a parallel light by means of a first cylindrical lens (6), athe main face of a light guide plate (9) by means of a one-dimensional scattering element (5). The scattered laser beam is transformed into a parallel light by means of a first cylindrical lens (6), and then converged in the thickness-wise direction of the light guide plate (9) by means of a second cylindrical lens (7). The converged laser beam is reflected twice at the light angle by means of a mnd then converged in the thickness-wise direction of the light guide plate (9) by means of a second cylindrical lens (7). The converged laser beam is reflected twice at the light angle by means of a mirror (8) and was guided to the side area of the light guide plate (9).irror (8) and was guided to the side area of the light guide plate (9).