A pixel structure for use in a display panel includes a switching element and a storage capacitor. The switching element has a drain electrode and a source electrode disposed on a high-k dielectric layer with k being equal to or higher than 8. The storage capacitor has a first capacitor electrode, a second capacitor electrode and a third capacitor electrode, wherein a passivation layer is disposed between the second an third capacitor electrodes and the high-k dielectric layer is also disposed between the first and second capacitor electrodes. The pixel structure also has a common line connected to the first capacitor electrode, a source line, and a gate line arranged such that the source line, the gate line and the common line may cross over each other over a low-k dielectric layer at a cross-over area where k is equal to or lower than 5.