TFT array substrate and OLED display panel

An OLED display panel, comprising a TFT array substrate, the TFT array substrate comprising a display area, a non-display area around the display area, a COF bonding area and a test area;

• wherein
• the COF bonding area and the test area are arranged in the non-display area;
• and
• the test area comprises a plurality of test pads spaced apart from each other, and the test area comprises a barrier layer and a first inorganic insulating layer being in direct contact with the barrier layer;
• wherein the COF bonding area and the test area are disposed at two opposite sides of the display area;
• wherein the test area further comprises a second inorganic insulating layer, a first metal layer and an organic insulating layer, and the barrier layer, the first inorganic insulating layer, the second inorganic insulating layer, the first metal layer and the organic insulating layer successively disposed on a substrate;
• wherein
• the first metal layer comprises the plurality of test pads located in the test area;
• and
• the organic insulating layer comprises a plurality of first openings so as to expose the plurality of test pads by the first openings;
• wherein the test area further comprises a second metal layer arranged on the organic insulating layer;
• the first metal layer further comprises a signal line spaced apart from the test pads;
• the signal line is connected to a negative electrode layer through the second metal layer;
• the second metal layer comprises a plurality of second openings corresponding to the first openings, and the test pads are exposed by the second openings and the first openings.

A TFT array substrate, defining a display area and a non-display area, wherein

• one portion of the TFT array substrate corresponding to the non-display area comprises a substrate, a barrier layer, a first inorganic insulating layer, a second inorganic insulating layer and a first metal layer, and the barrier layer, the first inorganic insulating layer, the second inorganic insulating layer and the first metal layer are successively disposed on the substrate, the first metal layer comprises a plurality of test pads;
• the plurality of test pads are connected to a test circuit located on the TFT array substrate to form a test module;
• the portion of the TFT array substrate corresponding to the non-display area further comprises an organic insulating layer disposed on the second insulating layer and surrounding the first metal layer;
• the organic insulating layer defines a plurality of first openings so as to expose the plurality of test pads by the plurality of first openings;
• the portion of the TFT array substrate corresponding to the display area further comprises a negative electrode layer;
• the portion of the TFT array substrate corresponding to the non-display area further comprises a second metal layer disposed on the organic insulating layer, the second metal layer defines a plurality of second openings communicated with the first openings so as to expose the plurality of test pads;
• wherein the first metal layer further comprises a signal line spaced apart from the plurality of test pads, the second metal layer is in touch with the signal line and the negative electrode layer such that the signal line is electrically connected to the negative electrode layer.