An array substrate belongs to the technical field of display technology and solves the technical problem of low aperture ratio of prior liquid crystal display device. The array substrate includes a plurality of sub pixel units arranged in an array and a plurality of signal lines, wherein one signal line of two adjacent signal lines is arranged in a first side of corresponding sub pixel units, and the other signal line is arranged in a second side of corresponding sub pixel units. The first side and the second side are one of opposite sides of the sub pixel units respectively. The array substrate can be used in liquid crystal television, liquid crystal display, mobile phone, tablet personal computer and other display devices.