A linear motor capable of attaining thinning is obtained. The light module includes a first circuit board, a second circuit board, and a light source, wherein the first circuit board has a first opening and a second opening, and the second circuit board has a first bending portion. The mixing circuit receives the first serial data from the first parallel-to-serial converter and the second serial data from the second parallel-to-serial converter to output a signal emphasizing a change point of the first serial data.