A display device comprising: a first substrate being a color filter on array substrate and comprising a display area and a non-display area wherein the display area includes a plurality of pixels arranged in a matrix to display an image and the non-display area is disposed around the display area and in which driver circuits are placed; a light-blocking pattern comprising an opening part (192a, 192c) formed on the first substrate in the non-display area; and a dummy color layer (164a, 164c) disposed under the opening part (192a, 192c) on the first substrate at a location corresponding to the opening part (192a, 192c) for preventing leakage of light through the opening part (192a, 192c), wherein the opening part (192a, 192c) and the dummy color layer (164a, 164c) extend both in the same direction, the display device further comprises: a sealing member disposed in the non-display area such that the sealing member completely overlaps the opening part (192a, 192c), and a common voltage line (116, 184) exposed by the opening part (192a, 192c) to a conductive member being included in the sealing member, and, the display device further comprises: a second substrate placed to face the first substrate, and a common electrode disposed on the second substrate, wherein the conductive member is disposed between the common electrode and the common voltage line (116, 184) to contact the common electrode and the common voltage line (116, 184), wherein each of the opening part (192a, 192c) and the dummy color layer (164a, 164c) are provided not as an intermittently broken line but as one continuous line, wherein the dummy color layer (164a, 164c) is adapted for securing a step that provides contact between the conductive member and the common electrode and the conductive member being arranged between the step of the dummy color layer (164a, 164c) and the common electrode, and wherein both of the length of the opening part (192a, 192c) and the length of the dummy color layer (164a, 164c) are greater than the width of the display area in said same direction. a first substrate being a color filter on array substrate and comprising a display area and a non-display area wherein the display area includes a plurality of pixels arranged in a matrix to display an image and the non-display area is disposed around the display area and in which driver circuits are placed; a light-blocking pattern comprising an opening part (192a, 192c) formed on the first substrate in the non-display area; and a dummy color layer (164a, 164c) disposed under the opening part (192a, 192c) on the first substrate at a location corresponding to the opening part (192a, 192c) for preventing leakage of light through the opening part (192a, 192c), wherein the opening part (192a, 192c) and the dummy color layer (164a, 164c) extend both in the same direction, the display device further comprises: a sealing member disposed in the non-display area such that the sealing member completely overlaps the opening part (192a, 192c), and a common voltage line (116, 184) exposed by the opening part (192a, 192c) to a conductive member being included in the sealing member, and, the display device further comprises: a second substrate placed to face the first substrate, and a common electrode disposed on the second substrate, wherein the conductive member is disposed between the common electrode and the common voltage line (116, 184) to contact the common electrode and the common voltage line (116, 184), wherein each of the opening part (192a, 192c) and the dummy color layer (164a, 164c) are provided not as an intermittently broken line but as one continuous line, wherein the dummy color layer (164a, 164c) is adapted for securing a step that provides contact between the conductive member and the common electrode and the conductive member being arranged between the step of the dummy color layer (164a, 164c) and the common electrode, and wherein both of the length of the opening part (192a, 192c) and the length of the dummy color layer (164a, 164c) are greater than the width of the display area in said same direction. a sealing member disposed in the non-display area such that the sealing member completely overlaps the opening part (192a, 192c), and a common voltage line (116, 184) exposed by the opening part (192a, 192c) to a conductive member being included in the sealing member, and, the display device further comprises: a second substrate placed to face the first substrate, and a common electrode disposed on the second substrate, wherein the conductive member is disposed between the common electrode and the common voltage line (116, 184) to contact the common electrode and the common voltage line (116, 184), wherein each of the opening part (192a, 192c) and the dummy color layer (164a, 164c) are provided not as an intermittently broken line but as one continuous line, wherein the dummy color layer (164a, 164c) is adapted for securing a step that provides contact between the conductive member and the common electrode and the conductive member being arranged between the step of the dummy color layer (164a, 164c) and the common electrode, and wherein both of the length of the opening part (192a, 192c) and the length of the dummy color layer (164a, 164c) are greater than the width of the display area in said same direction.