Display device with touch sensor

A display device comprises: a display plate including a plurality of pixels; and a touch sensor formed on the display plate. The touch sensor comprises: a touch substrate; a plurality of detection electrodes formed on the touch substrate; a protection layer configured to cover the plurality of detection electrodes on the touch substrate; and first and second low refractive layers having a lower refractive index than a refractive index of the protection layer wherein the first and second low refractive layers are formed on lower and upper surfaces of the protection layer, respectively. Therefore, the display device can increase brightness.