A thin film transistor (TFT) array substrate and an organic light emitting diode (OLED) panel are provided. The TFT array substrate includes a display area and a non-display area. The non-display area is provided with a plurality of gate traces connected to a control chip, the TFT array substrate includes: a flexible substrate includes a metal jumper-joint sublayer disposed in the non-display area, wherein the metal jumper-joint sublayer is adjacent to the display area; and a thin film transistor is disposed on the flexible substrate, wherein the thin film transistor layer includes a plurality of thin film transistors correspondingly disposed in the display area, and a gate trace of each of the thin film transistors and the gate trace of the non-display area are connected by a jumper joint arrangement through the metal jumper-joint sublayer.