An array substrate includes a transparent substrate, a switching element, an insulating layer and a pixel electrode. The switching element includes a gate electrode formed on the transparent substrate and connected to a gate line, a channel layer formed on the gate electrode and extended in a first direction, a source electrode formed on the transparent substrate and connected to a source line and a drain electrode formed on the channel layer to cover the channel layer. The insulating layer has a contact hole to partially expose the drain electrode and the transparent substrate. The pixel electrode is connected to the drain electrode through the contact hole. When the above array substrate is employed in a liquid crystal display panel, the array substrate reduces pixel defect.