Anisotropic conductive film

Abstract

The invention relates to an anisotropic conductive film which comprises a resin film and conductive particles. The resin film is provided with a middle area and a periphery area; conductive particles with first density in the middle area are prevented from gathering by the ionizing-in of the conductive particles; conductive particles with second density are prevented from gathering by the ionizing-out of the conductive particles; and the first density is larger than the second density. The invention overcomes the defects that a large amount of conductive particles gather on two sides of the anisotropic conductive film when the prior ACF is used for splicing TCP to cause two adjacent TCP pins to mutually conduct electricity and cause bright line to be poor, improves the quality of the anisotropic conductive film and particularly improves the quality of the anisotropic conductive film used for a liquid crystal display device.

Description

technical field [0001] The present invention relates to an anisotropic conductive film, in particular to an anisotropic conductive film which prevents aggregation of conductive particles when bonding TCP. Background technique [0002] Anisotropy Conductive Film (ACF for short) refers to a thermosetting or thermoplastic resin film containing conductive particles. It is mainly used for the signal transmission connection between the liquid crystal display panel and the driver integrated circuit. [0003] In the existing ACF, conductive particles are evenly distributed in the resin film, and a certain gap is provided between the conductive particles, so that the ACF is in a non-conductive state. When the tape carrier package (Tape Carrier Package, hereinafter referred to as TCP) is bonded, the ACF is first preset on the lead of the TCP, and then the ACF is squeezed toward the TCP direction with an extrusion tool to reduce the thickness of the ACF. At this time, due to the diff...

AI Technical Summary

Problems solved by technology

At this time, because the height of the area between TCP pin 2 and TCP pin 2 is different, different changes occur on the TCP pin 2 and the area between the TCP pins, specifically: on the TCP pin The conductive particles are in close contact through the extrusion process, so that the ACF located on the TCP pin conducts electricity; although the conductive particles between the TCP pins 2 can reduce the distance between the conductive particles through the extrusion process, they cannot be completely contacted, so Anisotropic conductive film 1 between TCP pins 2 still does not conduct electricity

[0005] However, in a large number of production practices, it has been found that due to the limitation of the extrusion tool and the precision of the extrusion process, on the extruded ACF, conductive particles appear to swim to both sides of the ACF, and relatively more gather on both sides of the ACF Conductive particles, so that the conductive particles gathered between the TCP pins 2 on both sides of the ACF make between two adjacent TCP pins 2 (such as Figure 1b The A region in ) is mutually conductive, and this kind of defect will directly cause the bright line 5 to appear on the panel 4 of the liquid crystal display device, that is, the bright line is bad.

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