A curved liquid crystal display device, comprising: a curved liquid crystal panel having a first side and a second side, both sides extending along a common direction called horizontal side; a backlight unit comprising: a bottom cover; a light guide plate disposed on the bottom cover; an optical sheet disposed on the light guide plate; and a light source substrate arranged horizontally along at least the first side or the second side of the liquid crystal panel to provide light into the light guide plate; a reinforcement frame (3, 30) attached to the bottom cover and extended along the horizontal side of the liquid crystal panel and having a predetermined curvature, wherein the reinforcement frame (3, 30) comprises a horizontal reinforcement bar extending along the horizontal side and a side wall (33, 37) extending perpendicular to the horizontal side of the liquid crystal panel so as to protrude from the horizontal reinforcement bar toward the liquid crystal panel; wherein the light source substrate is arranged on the side wall of the reinforcement frame (3, 30), characterized in that the reinforcement frame (3, 30) has the predetermined curvature along the horizontal side; the bottom cover is disposed on the reinforcement frame (3, 30) so as to have the predetermined curvature of the reinforcement frame (3, 30), and the light source substrate and the side wall (33, 37) of the reinforcement frame (3, 30) are both curved so as to have the same predetermined curvature along the horizontal side, the light source substrate extending along the curved side wall of the reinforcement frame (3, 30). a curved liquid crystal panel having a first side and a second side, both sides extending along a common direction called horizontal side; a backlight unit comprising: a bottom cover; a light guide plate disposed on the bottom cover; an optical sheet disposed on the light guide plate; and a light source substrate arranged horizontally along at least the first side or the second side of the liquid crystal panel to provide light into the light guide plate; a bottom cover; a light guide plate disposed on the bottom cover; an optical sheet disposed on the light guide plate; and a light source substrate arranged horizontally along at least the first side or the second side of the liquid crystal panel to provide light into the light guide plate; a reinforcement frame (3, 30) attached to the bottom cover and extended along the horizontal side of the liquid crystal panel and having a predetermined curvature, wherein the reinforcement frame (3, 30) comprises a horizontal reinforcement bar extending along the horizontal side and a side wall (33, 37) extending perpendicular to the horizontal side of the liquid crystal panel so as to protrude from the horizontal reinforcement bar toward the liquid crystal panel; wherein the light source substrate is arranged on the side wall of the reinforcement frame (3, 30), characterized in that the reinforcement frame (3, 30) has the predetermined curvature along the horizontal side; the bottom cover is disposed on the reinforcement frame (3, 30) so as to have the predetermined curvature of the reinforcement frame (3, 30), and the light source substrate and the side wall (33, 37) of the reinforcement frame (3, 30) are both curved so as to have the same predetermined curvature along the horizontal side, the light source substrate extending along the curved side wall of the reinforcement frame (3, 30).