Abstract: The present invention relates to a heterocyclic modified platinum complex containing an ONCN tetradentate ligand, which has a structure as shown in Chemical Formula (I). The complex is used in organic light-emitting diodes, has a relatively low driving voltage and relatively high luminous efficiency, can significantly prolong the service life of a device, and has the potential for application in the field of organic electroluminescent devices. The present invention further provides an organic electroluminescent device including a cathode, an anode and an organic layer, the organic layer includes one or more layers of a hole injection layer, a hole transport layer, a light-emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer, and at least one layer in the organic layer contains the compound as shown in Structural Formula (I).

Abstract: Navigation method and system are provided. The navigation method may include: a vehicle mounted system, which includes a storage device and a display, receiving a Turn-by-Turn navigation guidance instruction from a mobile device which has a navigation program running thereon; the vehicle mounted system selecting at least one guidance logo, stored in the storage device, according to the received Turn-by-Turn navigation guidance instruction; and the vehicle mounted system presenting on the display the at least one selected guidance logo. More vehicles can provide navigation with help of the mobile device.

Abstract: Navigation method and system are provided. The navigation method may include: a vehicle mounted system, which includes a storage device and a display, receiving a Turn-by-Turn navigation guidance instruction from a mobile device which has a navigation program running thereon; the vehicle mounted system selecting at least one guidance logo, stored in the storage device, according to the received Turn-by-Turn navigation guidance instruction; and the vehicle mounted system presenting on the display the at least one selected guidance logo. More vehicles can provide navigation with help of the mobile device.