A touch sensor unit includes a substrate and a plurality of touch electrodes disposed on the substrate for generating sensing signals. Each of the touch electrodes includes an electrically insulating layer that is light-transmissible, and a plurality of nano-scale conducting elements distributed in the electrically insulating layer and electrically connected to one another. Each of the conducting elements includes a metal body that has a roughened surface, that has a twisted structure, or that is formed with a light light-absorbing member thereon.