A pixel structure including a substrate, a gate, a dielectric layer, a semiconductor layer, a plurality of semiconductor bumps, a source, a drain and a reflective pixel electrode is disclosed. The gate is disposed on the substrate. The dielectric layer is disposed on the substrate and covers the gate. The semiconductor layer is disposed on the dielectric layer over the gate. The semiconductor bumps are disposed on the dielectric layer. The source and drain are disposed on the semiconductor layer. The reflective pixel electrode covering the semiconductor bumps is disposed on the dielectric layer and electrically connected to the drain.