A novel display device and the like are provided. The data processing device includes a display panel, a means to obtain locational data, an arithmetic device, an angular sensor, a first housing, a second housing, and a hinge connected the first and second housings. The display panel is flexible, and is held in the inside of the first and second housings. The arithmetic device has a function of generating first image data based on locational data. The angular sensor supplies data of the folding angle between the housings to the arithmetic device. The arithmetic device has a function of generating second image data based on the locational data and the angular data. The second image data includes a second image and display coordinates of the second image. The display panel has a function of displaying an image based on the first image data and the second image data.