Flexible circuit board, manufacturing method thereof and display device

Abstract

The invention provides a flexible circuit board, a manufacturing method thereof and a display device. The flexible circuit board comprises a main board and a small board, the main board is provided with at least one first welding area for exposing a part of a first conductive layer, the small board is provided with at least one second welding area for exposing a part of a second conductive layer, the second welding area comprises a welding hole, the orthographic projection of the second welding area on the mainboard is at least partially overlapped with the first welding area, and the first conductive layer and the second conductive layer are connected through a welding structure. The welding structure comprises: a first layer of welding flux which is located on the first conductive layer part exposed by the first welding area; a second layer of welding flux which is located on the part, exposed out of the second welding area, of the second conducting layer, wherein at least part of the second layer of welding flux is welded and fixed to the first layer of welding flux through the welding hole; and a high-melting-point connecting piece, wherein one end of the high-melting-point connecting piece is located in the first layer of welding flux, the other end of the high-melting-point connecting piece is located in the second layer of welding flux in the welding hole, and the melting point of the high-melting-point connecting piece is higher than that of the first layer of welding flux and that of the second layer of welding flux. According to the flexible circuit board, the manufacturing method thereof and the display device, the welding quality and the welding yield of the circuit board can be improved.

Description

technical field [0001] The invention relates to the technical field of circuit boards, in particular to a flexible circuit board, a manufacturing method thereof, and a display device. Background technique [0002] In the related art, a flexible printed circuit (FPC) is a highly reliable and excellent flexible printed circuit board made of polyimide or polyester film as the base material. [0003] In the display module using the FMLOC (Flexible Multi-Layer On Cell, flexible multi-layer touch structure) process, the TP (touch module) circuit is FOP bound to the M-FPC (main flexible circuit board) through the display screen. Fixed (FPC OnCOP Bonding) connection, from the perspective of cost performance, the M-FPC in the module of the FMLOC process flow will use the FPC of the multi-layer board stacking structure, such as the FPC of the 2+2 structure. [0004] The flexible circuit board of this multi-layer board stacking structure includes a main board and a small board. After ...

AI Technical Summary

Problems solved by technology

[0005] The flexible circuit board with the stacked structure of the multi-layer board in the existing process is prone to bubbles and defects such as welding defects during welding, resulting in a low yield rate of the flexible circuit board process, and there are flexible circuit boards that have not been detected due to defective bonding and flow into the terminal the risk of greater loss

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