A display module comprising: a glass substrate of a quadrangle type having a front surface and a back surface opposite to the front surface: a thin film transistor, TFT, layer formed on the front surface of the glass substrate a plurality of light emitting diodes, LEDs (161, 163, 165), mounted on the TFT layer; a plurality of side wirings formed at intervals in an edge area of the glass substrate; and a plurality of connection pads formed in the edge area and electrically connected to the plurality of side wirings, wherein the edge area comprises: a first area corresponding to a side surface of the glass substrate; a second area adjacent to the side surface of the glass substrate in the front surface of the glass substrate; a third area adjacent to the side surface of the glass substrate in the back surface of the glass substrate; a first chamfered surface formed at a corner at which the first area and the second area meet; and a second chamfered surface formed at a corner at which the first area and the third area meet, and wherein each of the plurality of side wirings is disposed along the second area, the first chamfered surface, the first area, the second chamfered surface, and the third area; characterized by: the display module further comprising an insulating layer having grooves and disposed on the plurality of connection pads, the plurality of connection pads formed in the edge area being partially exposed by the grooves of the insulating layer. a glass substrate of a quadrangle type having a front surface and a back surface opposite to the front surface: a thin film transistor, TFT, layer formed on the front surface of the glass substrate a plurality of light emitting diodes, LEDs (161, 163, 165), mounted on the TFT layer; a plurality of side wirings formed at intervals in an edge area of the glass substrate; and a plurality of connection pads formed in the edge area and electrically connected to the plurality of side wirings, wherein the edge area comprises: a first area corresponding to a side surface of the glass substrate; a second area adjacent to the side surface of the glass substrate in the front surface of the glass substrate; a third area adjacent to the side surface of the glass substrate in the back surface of the glass substrate; a first chamfered surface formed at a corner at which the first area and the second area meet; and a second chamfered surface formed at a corner at which the first area and the third area meet, and wherein each of the plurality of side wirings is disposed along the second area, the first chamfered surface, the first area, the second chamfered surface, and the third area; characterized by: the display module further comprising an insulating layer having grooves and disposed on the plurality of connection pads, the plurality of connection pads formed in the edge area being partially exposed by the grooves of the insulating layer. a first area corresponding to a side surface of the glass substrate; a second area adjacent to the side surface of the glass substrate in the front surface of the glass substrate; a third area adjacent to the side surface of the glass substrate in the back surface of the glass substrate; a first chamfered surface formed at a corner at which the first area and the second area meet; and a second chamfered surface formed at a corner at which the first area and the third area meet, and wherein each of the plurality of side wirings is disposed along the second area, the first chamfered surface, the first area, the second chamfered surface, and the third area; characterized by: the display module further comprising an insulating layer having grooves and disposed on the plurality of connection pads, the plurality of connection pads formed in the edge area being partially exposed by the grooves of the insulating layer.