Packaging method and packaging structures

Abstract

The invention discloses a packaging method and packaging structures. The packaging method includes the steps of providing a plurality of individual image sensing chips, wherein each image sensing chip is provided with an image sensing area and a bonding pad surrounding the image sensing area; providing a PCB substrate, wherein a metal layer is formed on the surface of the PCB substrate; reversedly arranging the image sensing chips on the PCB substrate, wherein the bonding pads are electrically connected with the metal layer; forming a plastic sealing layer which covers the surface of the metal layer and the surfaces of the image sensing chips; forming a through hole, exposed out of the surface of the metal layer, in the plastic sealing layer; forming a welding protrusion which fully fills the through hole, wherein the top of the welding protrusion is higher than the surface of the plastic sealing layer; cutting the PCB substrate along the area of cutting lines to form the multiple single packaging structures. The packaging process is simple, the packaging structures have good packaging performance and high reliability, the packaging process can be partly conducted through the PCB manufacturing technology, and packaging process difficulty and packaging cost are reduced.

Description

technical field [0001] The invention relates to semiconductor packaging technology, in particular to a packaging method and a packaging structure. Background technique [0002] An image sensor is a sensor that senses external light and converts it into an electrical signal. After the image sensor chip is manufactured, a series of packaging processes are performed on the image sensor chip to form a packaged image sensor for use in various electronic devices such as digital cameras and digital video cameras. [0003] The traditional image sensor packaging method is usually packaged by wire bonding (Wire Bonding). However, with the rapid development of integrated circuits, longer leads make the product size unable to meet the ideal requirements. Therefore, wafer-level packaging (WLP: Wafer Level Package) has gradually replaced wire bonding packaging as a more commonly used packaging method. [0004] Such as figure 1 as shown, figure 1 It is a package structure, including: a...

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Problems solved by technology

[0005] However, the packaging performance of the above-mentioned packaging structure needs to be further improved, and the packaging process for forming the above-mentioned packaging structure is relatively complicated.

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