Winding for thin film coating crystal package and its constitution and manufacturing method

Abstract

The invention relates to a coil band used to pack film on the crystal and relative preparation. Wherein, said coil band comprises a flexible dielectric base material, a lead-wire layer and a welding-resistance layer; said lead-wire layer comprises dual cam pads in thickened state, to height the connected surface of cam pads over the upper surface of wire layer and the welding-resistance layer; therefore, the welding-resistance layer is formed above the flexible dielectric base material and covers the upper surface of wire; and the welding-resistance layer will not disperse on the connected surface, to improve the bond ability of cam pad on the chip cam.

Description

technical field [0001] The present invention relates to a chip-on-film packaging technology, in particular to a chip-on-film packaging tape, a chip-on-film packaging structure using the tape, and a manufacturing method thereof. Background technique [0002] As electronic packaging products continue to evolve in the direction of thinner, smaller, and higher pin counts, under the influence of fine pitch (Fine Pitch) packaging technology requirements, the existing conventional "Chip-On-Film (COF)" is A chip is flip-chip bonded on a tape to be used in the packaging of multi-pin IC driver chips. As the bump pitch on the chip becomes smaller, more bumps can be arranged. Similarly, the distance between the inner bonding ends of the tape will be correspondingly reduced, for example, 50 microns, or even less than 30 microns. In a chip packaging process using a tape, the leads of the tape are easily short-circuited, resulting in an increase in the defective rate. [0003] Please re...

AI Technical Summary

Problems solved by technology

In addition, in the high-density film-on-chip bonding technology, the inner ends of the leads 20 are required to be changed to a stagger arrangement (not shown in the figure), that is, the bare parts of the leads 20 are long or short. , the bump that originally joined the inner end of the outer lead is very easy to press into the longer bare wire at the inner end of the adjacent inner lead, causing an electrical short circuit

[0004] It can be seen that the above-mentioned existing film-on-chip packaging tape obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

In order to solve the problems of film-on-chip packaging tapes, relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time. This is obviously a problem that the relevant industry is eager to solve.

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