Display device and operation method thereof, and electronic device

A display device comprising:

• a first circuit;
• a second circuit;
• a third circuit;
• a fourth circuit;
• and
• a display portion;
• wherein the first circuit is configured to generate first display data,
• wherein the first display data is digital data which has information on luminance of an image displayed on the display portion,
• wherein the second circuit is configured to generate second display data,
• wherein the second display data is digital data which is obtained by converting a digital value of the first display data,
• wherein the third circuit is configured to generate a first analog signal and a second analog signal whose potentials are calculated based on the digital value of the first display data,
• wherein the potential of the first analog signal is lower than the potential of the second analog signal,
• wherein the fourth circuit is configured to convert the second display data into third display data,
• wherein the third display data is analog data,
• wherein a potential of the third display data is calculated on the basis of the potential of the first analog signal, the potential of the second analog signal, and a digital value of the second display data,
• wherein the potential of the third display data is higher than or equal to the potential of the first analog signal and lower than or equal to the potential of the second analog signal, and
• wherein the display portion is configured to display an image whose luminance corresponds to the potential of the third display data.