A display module is provided, which comprises a stacked printed circuit board, and a control circuit mounted on the stacked printed circuit board. The stacked printed circuit board includes at least a first printed wiring board, a second printed wiring board, and a flexible insulating substrate interposed between the first printed wiring board and the second printed wiring board. The flexible insulating substrate includes at least a first connecting portion and a second connecting portion. A display panel is electrically connected to one of the first connecting portion and the second connecting portion. The control circuit includes a memory. The control circuit supplies an electrical signal to the one of the first connecting portion and the second connecting portion in accordance with a data stored in the memory.