A parallax barrier for a display device, the parallax barrier comprising: a first substrate and a second substrate; a first alignment layer and a second alignment layer disposed respectively on the first substrate and the second substrate, the first alignment layer and the second alignment layer having an alignment direction; a polarizer on the second substrate, an optical axis direction of the polarizer being parallel to the alignment direction; a liquid crystal layer between the first substrate and the second substrate; a common electrode between the second substrate and the liquid crystal layer; at least one insulating layer on the first substrate; a plurality of alternately arranged light blocking regions and light transmitting regions; a plurality of first electrodes and a plurality of second electrodes on the insulating layer, the plurality of first electrodes and the plurality of second electrodes each arranged to selectively generate an electric field with the common electrode so as to respectively form one light blocking region and one light transmitting region to selectively block and transmit light incident on the side of the first substrate and having optical components that are in parallel to the optical axis direction of the polarizer; and a black matrix between the second substrate and the common electrode, and arranged to block light at a region corresponding to the region (a) between a light blocking region and a light transmitting region, wherein the black matrix covers the region (a) between a light blocking region and a light transmitting region, and partially covers regions of at least one of the plurality of first electrodes and at least one of the plurality of second electrodes, wherein the plurality of first electrodes and the plurality of second electrodes are on the same layer, wherein the first electrodes among the plurality of first electrodes are configured to be applied with a same voltage and are arranged in the one light blocking region, and wherein the second electrodes among the plurality of second electrodes are configured to be applied with a same voltage and are arranged in the one light transmitting region, wherein the first and second electrodes are arranged with predetermined intervals therebetween. a first substrate and a second substrate; a first alignment layer and a second alignment layer disposed respectively on the first substrate and the second substrate, the first alignment layer and the second alignment layer having an alignment direction; a polarizer on the second substrate, an optical axis direction of the polarizer being parallel to the alignment direction; a liquid crystal layer between the first substrate and the second substrate; a common electrode between the second substrate and the liquid crystal layer; at least one insulating layer on the first substrate; a plurality of alternately arranged light blocking regions and light transmitting regions; a plurality of first electrodes and a plurality of second electrodes on the insulating layer, the plurality of first electrodes and the plurality of second electrodes each arranged to selectively generate an electric field with the common electrode so as to respectively form one light blocking region and one light transmitting region to selectively block and transmit light incident on the side of the first substrate and having optical components that are in parallel to the optical axis direction of the polarizer; and a black matrix between the second substrate and the common electrode, and arranged to block light at a region corresponding to the region (a) between a light blocking region and a light transmitting region, wherein the black matrix covers the region (a) between a light blocking region and a light transmitting region, and partially covers regions of at least one of the plurality of first electrodes and at least one of the plurality of second electrodes, wherein the plurality of first electrodes and the plurality of second electrodes are on the same layer, wherein the first electrodes among the plurality of first electrodes are configured to be applied with a same voltage and are arranged in the one light blocking region, and wherein the second electrodes among the plurality of second electrodes are configured to be applied with a same voltage and are arranged in the one light transmitting region, wherein the first and second electrodes are arranged with predetermined intervals therebetween.