An operation method of an electronic device for sensing an optical signal is provided. The electronic device includes a plurality of optical sensors and a plurality of light-emitting elements disposed adjacent to the plurality of optical sensors. The operation method of the electronic device for sensing the optical signal includes the following steps. The optical signal is provided to a first optical sensor of the plurality of optical sensors. The first optical sensor outputs a driving signal when dimming the plurality of light-emitting elements adjacent to the first optical sensor. Therefore, the accuracy of sensing the optical signal may be effectively increased.