Display device and bonding detection method of display device

A display device, comprising:

• a display panel;
• a flexible circuit board;
• a chip on film with a control chip, wherein the display panel is connected with the flexible circuit board through the chip on film in a bonding manner;
• a first detection line located on the display panel;
• a second detection line extending to the flexible circuit board from one end of the first detection line through the chip on film;
• and
• a third detection line extending to the flexible circuit board from the other end of the first detection line through the chip on film;
• wherein a path where the second detection line is located is provided with at least two first test pins, and a path where the third detection line is located is provided with at least two second test pins;
• the second detection line and the third detection line are both closed loops;
• wherein each of the closed loops comprises:
• two first traces extending in a first direction on the chip on film,
• a semi-closed first line frame located on the display panel, and
• a semi-closed second line frame located on the flexible circuit board,
• wherein the first direction is a direction pointing from the display panel to the flexible circuit board, and the first detection line is connected to the first line frame;
• and
• two ends of the first line frame are correspondingly butted with two ends of the two first traces respectively, and two ends of the second line frame are correspondingly butted with the other two ends of the two first traces respectively.