A flat display structure including a substrate, a pixel matrix, a driving circuit and several voltage adapting devices and driving method thereof are provided. Each of voltage adapting devices includes an input terminal, a first control terminal and an output terminal. The input terminal is electrically connected to the i-th gate line Gi corresponding to the i-th pixel row Ri. The first control terminal is adapted to receive a first control signal. The output terminal is adapted to receive a working voltage.