A thin film transistor array substrate including a substrate, scan lines and data lines both disposed on the substrate, and pixel structures is provided. The front end of the chassis is disposed with a front wheel and a handlebar used to control the direction of the front wheel. 15 to 15%,MgO + CaO + SrO + BaO4 to 30%,Na2Omore than 0% and at most 10%,K2O1 to 21%,Li2O0 to 1%,Na2O + K2O + Li2O6 to 25%,ZrO20 to 10%, andFe2O30. A discovering apparatus reads one or more transmitted messages, sees the service it wants is available through both, compares the different locations andor the different link metrics, and based on the comparing chooses which network to join, or with which apparatus on the single network to create a peer link.