A display and a circuit board structure thereof are provided. The circuit board structure includes a first circuit board, a second circuit board and a connection structure. The connection structure is disposed on the first circuit board, the second circuit board has gold fingers, the connection structure has pins corresponding to the gold fingers, and the connection structure conducts the first circuit board and the second circuit board by connecting the pins with the gold fingers. Therefore, an extra FFC and a connector disposed on the second circuit board for connecting the first circuit board and the second circuit board are saved to achieve cost reduction and assembling process simplification.