A pixel array including first signal lines, second signal lines, switch devices, and pixel units coupling to the first signal lines and the second signal lines through the switch devices is provided. The first signal lines and the second signal lines are formed on different films. Each of the pixel units includes a common electrode line. In each of the pixel units of an ith row, the common electrode line has at least one first line segment and at least one second segment coupled to each other and formed on different films, and a distance between an (i−1)th first signal line and the first line segment is not equal to that between the (i−1)th first signal line and the second line segment. The first signal lines are either scan lines or data lines of the pixel array, and the second signal lines are the other kind.