Quantum dot materials have extremely high application value in the fields of displays and solid-state lighting due to their unique light emission characteristics. Compared with the traditional display devices, quantum dot light emitting diodes (QLEDs) have the advantages of high stability, good solution processability and high color saturability, which make them become the core device of the new generation display technology. The structure, working principle and research progresses of QLEDs are introduced, and their application status and prospects in China display industry are also presented.