Display device having first and second display areas

A display device comprising:

• a display panel having a first display area and a second display area having different resolutions from each other;
• and
• an electronic element corresponding to the second display area of the display panel,
• wherein the display panel comprises:
• a substrate;
• a plurality of main sub-pixels on the substrate in the first display area;
• a plurality of pixel groups on the substrate and spaced apart from each other in the second display area;
• and
• extension lines between two pixel groups adjacent to each other in a first direction among the pixel groups and extending in the first direction,
• wherein each of the pixel groups comprises a plurality of auxiliary sub-pixels and a plurality of horizontal lines electrically connected to the plurality of auxiliary sub-pixels and extending in the first direction,
• wherein the extension lines are electrically connected to the horizontal lines included in each of the two pixel groups, and
• wherein, on a plane, a width of an area in which the extension lines are arranged in a second direction perpendicular to the first direction is less than a width of an area in which the horizontal lines are arranged in the second direction.