Head-up display and head-up display system for transportation

A head-up display system for a transportation, comprising:

• a display, configured to display a first image and comprising a substrate and a plurality of light-emitting units disposed on the substrate, wherein a first light-emitting unit and a second light-emitting unit of the plurality of light-emitting units respectively correspond to a first region and a second region of the first image;
• and
• a windshield, disposed adjacent to the display, wherein:
• the first image is projected onto the windshield and forms a second image, and a third region and a fourth region of the second image respectively correspond to the first region and the second region of the first image, and
• a configuration of the first light-emitting unit is different from a configuration of the second light-emitting unit, such that a chromaticity difference between the third region and the fourth region of the second image is less than a chromaticity difference between the first region and the second region of the first image.