Patent ID: 8373817

Claim:
A backlight unit, comprising: a rectangular light guide plate including a first edge and a second edge orthogonally crossing each other; a flexible substrate arranged along the first edge of the light guide plate; a light source arranged on the flexible substrate and emitting light to the first edge of the light guide plate, light emitted from the light source being emitted to outside from an upper surface of the rectangular light guide plate; a connection flexible substrate electrically connected to the light source arranged on the flexible substrate and arranged along the second edge of the light guide plate to outside of the backlight unit; a back case to contain the light guide plate, the back case including a first side wall and a second side wall to surround the light guide plate and a concave drawing portion formed in the second side wall facing the second edge of the light guide plate to draw the connection flexible substrate to outside of the back case; and a reflective sheet arranged under the light guide plate and having a main plate and a side wall built on an edge of the main plate adjacent to the second edge of the light guide plate to reflect light incident to the light guide plate to an upper surface of the light guide plate, and the sidewall of the reflective sheet being arranged along the second edge of the light guide plate so as to cover the second edge, wherein the second edge of the light guide plate facing the connection flexible substrate is cut out at an acute angle to the first edge of the light guide plate in a first distance from the first edge, forming an inclined cut out edge on the second edge, the concave drawing portion of the back case is located in a second distance shorter than the first distance from the first edge, and the connection flexible substrate is arranged in a gap between the side wall of the reflective sheet and the back case extending to the concave drawing portion.