A pixel array formed on a substrate mainly including scan lines and data lines is provided. The scan lines and the data lines are essentially consisted of conductive patterns disposed at different layers and contact windows electrically connected with the conductive patterns disposed at the different layers. The scan lines and the data lines are respectively consisted of conductive patterns to prevent the scan lines and the data lines from cracking when the substrate is warped. Besides, the pixel array further includes dielectric layers having trenches therein, to divide the dielectric layers into independent dielectric patterns. Thus, the dielectric layers would not crack easily when the substrate is warped.