A novel display panel that is highly convenient or highly reliable is provided. In addition, a novel input/output device that is highly convenient or highly reliable is provided. Furthermore, a novel data processor that is highly convenient or highly reliable is provided. A structure including a pixel and a functional film in which the functional film includes a region overlapping with the pixel, the pixel includes a first display element and a second display element, the functional film includes a first region and a second region, the first region includes a region overlapping with the first display element, and the second region includes a region overlapping with the second display element and has a function of transmitting less polarized light as compared with light transmitted through the first region has been devised.