ELECTRONIC PACKAGE STRUCTURE

An electronic package structure includes first and second package modules combined with each other. The first package module includes a substrate and a first electronic component disposed thereon, at least one second electronic component, and an insulation film. The first electronic component and the second electronic component are adjacent to each other. The insulation film includes a base material and a foam glue body, and the foam glue body is viscous and compressible. The second package module includes a heat dissipation plate and a liquid metal and an insulation protrusion portion disposed thereon. The liquid metal is pressed by the heat dissipation plate and the first electronic component. The insulation protrusion portion covers and abuts against the insulation film to press the foam glue body through the base material so as to deform the foam glue body and enable the foam glue body to cover the second electronic component.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan application serial no. 11/210,2431, filed on Jan. 18, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to an electronic package structure.

Description of Related Art

With the improvement of the function and the processing speed requirements of the electronic products, the semiconductor die as the core component of the electronic products requires higher density electronic components and electronic circuits, so a larger amount of heat energy is generated by the semiconductor die during operation. Furthermore, since the conventional encapsulant covering the semiconductor die is a poor heat transfer material with a heat conductivity of only 0.8 Wm-1k-1 (that is, the heat dissipation efficiency is not favorable), when the heat generated by the semiconductor die is not effectively dissipated, the heat generated will cause damage to the semiconductor die and product reliability issues. Therefore, in order to quickly dissipate the heat to the outside, the industry usually configures a heat dissipation plate in the semiconductor package. The heat dissipation plate is usually bonded to the back of the chip with a heat dissipation glue to dissipate the heat generated by the semiconductor die through the heat dissipation glue and the heat dissipation sheet. Furthermore, the top surface of the heat dissipation sheet is usually exposed to the encapsulant or directly exposed to the atmosphere so as to obtain a better heat dissipation effect.

The liquid metal is a low melting point alloy that is liquid at room temperature, or a solid sheet that becomes liquid when heated to the melting point thereof. The composition is, for example, gallium-indium-tin alloy, indium-bismuth-tin alloy, or indium-bismuth-zinc alloy, etc. The liquid metal is stable and has excellent heat conductivity and electrical conductivity, and the heat conductivity and the specific heat capacity thereof are much higher than the traditional silicone grease heat paste, so the liquid metal may be used as a heat conduction agent between the heat source and the heat dissipation fin to replace the heat dissipation glue above.

However, in practical applications, since the liquid metal at room temperature has high fluidity (a low viscosity), when the liquid metal is used as the heat conduction medium between the semiconductor die and the heat dissipation plate, it is often necessarily faced with the problem of overflow of the liquid metal in the process. That is, when the liquid metal is pressed by the heat dissipation plate and may overflow to the periphery of the semiconductor die, the liquid metal will often cause short circuit damage due to the liquid metal contacting the surrounding electronic components or the substrate (the circuit).

SUMMARY

The disclosure provides an electronic package structure, which provides a stable heat dissipation mechanism to protect the electronic component and the circuit.

An electronic package structure of the disclosure includes a first package module and a second package module. The first package module includes a substrate and a first electronic component disposed thereon, at least one second electronic component, and an insulation film. The first electronic component and the second electronic component are adjacent to each other. The insulation film includes a base material and a foam glue body, and the foam glue body is viscous and compressible. The second package module includes a heat dissipation plate and a liquid metal and an insulation protrusion portion disposed thereon. The first package module and the second package module are combined with each other. The liquid metal is pressed by the heat dissipation plate and the first electronic component. The insulation protrusion portion covers and leans against the insulation film to press the foam glue body through the base material so as to deform the foam glue body and enable the foam glue body to cover the second electronic component.

Based on the above, the electronic package structure is formed by combining the first package module and the second package module. The first package module is composed of a substrate, a first electronic component, at least one second electronic component, and an insulation film. The second package module is composed of a heat dissipation plate, a liquid metal, and an insulation protrusion portion. After the first and second package modules are respectively completed by the user, the two may be docked to complete the manufacture of the electronic package structure, and the manufacturing process may be simplified due to the above.

Moreover, the insulation film further includes a base material and a foam glue body. Since the foam glue body is viscous and compressible, the combined first and second package modules use the force applied when they are docked during the combination to enable the liquid metal to be pressed by the heat dissipation plate and the first electronic component. In addition, the insulation protrusion portion of the second package module may also cover and lean against the insulation film to press the foam glue body through the base material so as to deform the foam glue body and enable the foam glue body to cover the second electronic component. In this way, the second electronic component located around the first electronic component may be effectively covered and protected by the foam glue body. For the liquid metal that may overflow due to being pressed, the insulation protrusion portion and the insulation film may have the effects of isolation and protection to protect the second electronic component or the circuit on the substrate from contacting the liquid metal and causing a short circuit, so as to have the effects of both heat dissipation and protection.

DESCRIPTION OF THE EMBODIMENTS

FIG.1is a cross-sectional view of an electronic package structure according to an embodiment of the disclosure.FIG.2andFIG.3are partial schematic views of the electronic package structure ofFIG.1, respectively. Please refer toFIG.1toFIG.3at the same time. In the embodiment, an electronic package structure100includes a first package module M1and a second package module M2. The first package module M1includes a substrate110and a first electronic component A1disposed thereon, at least one second electronic component A2, and an insulation film120. The first electronic component A1and the second electronic component A2are adjacent to each other. The first electronic component A1is a semiconductor die, for example, configured to form a central processing unit (a CPU) or a graphics processing unit (a GPU). The second electronic component A2is an auxiliary electronic component configured with the first electronic component A1, such as a capacitor. The substrate110is, for example, a motherboard carrying the above-mentioned electronic components, on which multiple circuits (not shown) are disposed. The insulation film120includes a base material121and a foam glue body122. The base material121is, for example, a polyimide film (a PI film). The foam glue body122is viscous and compressible. The density thereof is 804-807 kg/m3 and the shore hardness thereof is (shore 00) 62-64.

Furthermore, the second package module M2includes a heat dissipation plate160, a liquid metal130disposed thereon, and an insulation protrusion portion. The insulation protrusion portion is exemplified by an insulation glue G1in the embodiment. At the same time, the second package module M2also includes an insulation glue G2. The insulation glues G1and G2are, for example, non-conductive (insulation) polymer gels, and the heat dissipation plate160is, for example, a copper heat dissipation plate. The heat sink (such as a heat dissipation fin, a fan, or a related heat sink, not shown) may be added on the other side of the liquid metal130so as to transfer the heat out of the electronic package structure100. At the same time, in order to prevent the copper heat dissipation plate from being corroded due to direct contact with the liquid metal130, an anti-corrosion metal layer is provided on the surface of the copper heat dissipation plate as an isolation layer of the copper heat dissipation plate.

It may be seen from the above that after the first package module M1and the second package module M2are respectively completed, the first package module M1and the second package module M2may be docked to form the electronic package structure100. It is worth noting that the force provided during the above-mentioned docking process may produce a press and clamp effect on some components, thereby achieving the desired purpose. The liquid metal130is pressed by the heat dissipation plate160and the first electronic component A1. The insulation protrusion portion (the insulation glue G1) on the heat dissipation plate160covers and leans against the insulation film120to press the foam glue body122through the base material121so as to deform the foam glue body122and enable the foam glue body122to cover the second electronic component A2, which are described in detail later.

Please refer toFIG.1andFIG.2again. The component composition of the second package module M2is described first. In addition to the above, the second package module M2of the embodiment further includes a foam140and a carrier layer170respectively disposed on the heat dissipation plate160, and the carrier layer170is located between the heat dissipation plate160and the foam140. Here, the carrier layer170is, for example, a polyester film Mylar (a PET film), which has considerable hardness to facilitate a better operating feeling for the user. Simply put, the foam140of the embodiment needs to be cut according to the actual configuration environment and conditions of the situation. Once the cut size is small, it is not conducive for the user to smoothly configure (attach) the foam140to the heat dissipation plate160.

For example, as shown inFIG.2, part of the foam140is located between the second electronic component A2and the first electronic component A1, and a width W1of a part is smaller than a width W2of the remaining part of the foam140. There is a recess RC shown inFIG.2that exists between the insulation protrusion portion (the insulation glue G1) and the foam140, so that after the second package module M2and the first package module M1are combined, the recess RC shown forms a required space for accommodating the second electronic component A2. Therefore, the foam140may only maintain its width W1in the part shown. Accordingly, in order to increase the convenience of the user during assembly, the foam140of the embodiment needs to be disposed on the carrier layer170first, and then the foam140is attached to the heat dissipation plate160by means of the carrier layer170. Conversely, in another embodiment not shown, without the precondition that the size is too small to be easily assembled and operated, the foam140may be directly assembled to the heat dissipation plate160without needing the carrier layer170.

Next, please refer toFIG.1andFIG.3at the same time. The first package module M1is described here. In the embodiment, the first package module M1further includes a retaining wall150, which is disposed on the substrate110and surrounds the first electronic component A1and the second electronic component A2. An inner side edge E1of the insulation film120covers the second electronic component A2and surrounds the first electronic component A1, and an outer side edge E2of the insulation film120covers the retaining wall150. Moreover, the first package module M1further includes a fixing glue G3, which is disposed on the substrate110and located on the periphery of the first electronic component A1so as to fix the first electronic component A1on the substrate110. There is a gap GP between the second electronic component A2and the fixing glue G3. Here, the fixing glue G3is, for example, an epoxy material, which is suitable for continuous completion when the first electronic component A1is packaged on the substrate110.

So far, the components of the first package module M1and the second package module M2have been as described above, and the features produced after the first package module M1and the second package module M2are docked with each other are described below.

Please refer toFIG.1again. When the first package module M1and the second package module M2are combined, part of the insulation protrusion portion (the insulation glue G1) also fills in the aforementioned gap GP and thus covers part of the side surface of the second electronic component A2. In other embodiments not shown, the insulation glue G1also partially overlaps with the fixing glue G3, but no matter whether the insulation glue G1and the fixing glue G3overlap each other or not, the respective effects mentioned above are not affected. In addition, in the embodiment, the insulation glues G1and G2may be uncured heat conduction gels (H-Putty), and the thickness thereof must be controlled below 1.2 mm so as to ensure the compressibility thereof to be in contact with the surrounding structure and be pressed.

It should be noted that, the above-mentioned corresponding configuration of the insulation film120and the insulation glue G1may also effectively reduce the difficulty of the process when the first package module M1and the second package module M2are docked and combined. In the embodiment, there is a gap of only 2.3 mm between the fixing glue G3and the capacitor (the second electronic component A2), so it is not easy for the insulation glue G1to accurately control the application scope and use amount. What the prior art does is to only coat all the second electronic component A2with the insulation glue G1, but obviously it has disadvantages such as an excessive use amount of the insulation glue G1and a longer application time. Accordingly, in order to effectively reduce the use amount of the insulation glue G1, in the embodiment, the insulation film120is used together with the insulation glue G1. The insulation film120is used to attach and cover at least most of the second electronic component A2, so as to save the application time, and the remaining part is filled with the insulation glue G1.

Furthermore, when the first package module M1and the second package module M2are combined, the foam140surrounds the first electronic component A1and the second electronic component A2, and the foam140leans against the base material121of the insulation film120, so that the foam140, the base material121of the insulation film120, and the foam glue body122are clamped between the heat dissipation plate160and the substrate110. Since the insulation glue G1is pressed against the base material121due to the force applied during docking, it may further exert pressure on the foam glue body122and cause the deformation thereof, so that the foam glue body122may not only contact the top surface of the second electronic component A2, but also extend to the side of the second electronic component A2due to the deformation, thereby creating a wrapping effect in which the second electronic component A2is substantially trapped in the foam glue body122. Conversely, in order to smoothly use the docking force of the first package module M1and the second package module M2to deform the foam glue body122, the insulation glue G1and the heat dissipation plate160are in a seamless contact (configuration), as shown inFIG.1.

Similarly, the same is true for the foam140. Since the part where the foam140is located still has the foam glue body122, it is also necessary to ensure the abutting relationship between the components through the seamless contact, so as to facilitate the aforementioned docking force to deform the compressible foam140and even the foam glue body122.

In addition, when the first package module M1and the second package module M2are combined, the insulation glue G2, the outer side edge E2of the insulation film120, and the retaining wall150are clamped between the heat dissipation plate160and the substrate110, and as mentioned above, the seamless contact between the components is beneficial to produce the required insulation effect.

As shown inFIG.1, when the first package module M1and the second package module M2are combined, the insulation glue G1, the foam140(and the carrier layer170), a part of the insulation film120, the retaining wall150, and another part of the insulation film120(the outer side edge E2) and the insulation glue G2form multiple spaces P1, P2, P3annularly disposed layer by by layer between the substrate110and the heat dissipation plate160. The first electronic component A1and the liquid metal130are located in the innermost space P1, and the spaces P1, P2, and P3are used as buffers for preventing the liquid metal130from overflowing.

In detail, as mentioned above, since the liquid metal130is pressed by the force when the first package module M1and the second package module M2docks and combines with each other, the problem of overflow of the liquid metal130is faced during the process. In the embodiment, different degrees of anti-blocking effects are provided through the spaces P1, P2, and P3formed by the above-mentioned components. In other words, the spaces P1, P2, and P3are used for the overflow of the liquid metal130, and since the insulation glue G1and the insulation glue G2have provided protection for the upper surface of the second electronic component A2or the substrate110, the occurrence of electrical short circuit may be avoided.

In addition, it should be mentioned that the foam140of the embodiment is SM-55 porous foam with a density of 57±5 kg/m3. In addition to having the compressibility to withstand the force exerted when the heat dissipation plate160and substrate110are docked, the porous structure thereof may also provide an adsorption effect on the liquid metal130overflowing into the space P2or the space P3, thereby preventing the liquid metal130from overflowing outside of the electronic package structure100.

FIG.4is a cross-sectional view of an electronic package structure according to another embodiment of the disclosure. Please refer toFIG.4. The difference between the embodiment and the aforementioned embodiment shown inFIG.1is that in an electronic package structure200of the embodiment, the insulation protrusion portion of a second package module M2A is exemplified by an insulation foam, and in particular exemplified by the foam140. As for the first package module M1, the first package module M1is the same as the above-mentioned embodiment and so is drawn with the same symbol and is not described again. In other words, in the embodiment, the foam140is also used to replace the use of the aforementioned insulation glue G1.

In this way, as shown inFIG.4, when the second package module M2A and the first package module M1are combined together, the second package module M2A is pressed against the insulation film120by the foam140. A part (an inner side) of the insulation film120covers the second electronic component A2, and is deformed when pressed by the insulation protrusion portion (the foam140) so that the foam glue body122is attached to the substrate110. Another part (the central part) of the insulation film120directly leans against (and attaches to) the substrate110when pressed by the foam140. A still another part (an outer side) of the insulation protrusion portion (the foam140) covers the retaining wall150, and the heat dissipation plate160is also coated on the insulation film120with the insulation glue G2, so that the still another part of the insulation protrusion portion is clamped between the insulation glue G2and the retaining wall150. As for the second electronic component A2, the second electronic component A2may also be completely covered by the foam glue body122being pressed.

To sum up, in the above embodiments of the disclosure, the electronic package structure is formed by combining the first package module and the second package module. The first package module is composed of the substrate, the first electronic component, the at least one second electronic component, and the insulation film. The second package module is composed of the heat dissipation plate, the liquid metal, and the insulation glue. After the first and second package modules are respectively completed by the user, the two may be docked to complete the manufacture of the electronic package structure, and the manufacturing process may be simplified due to the above.

Moreover, the insulation film further includes a base material and a foam glue body. Since the foam glue body is viscous and compressible, the combined first and second package modules use the force applied when they are docked during the combination to enable the liquid metal to be pressed by the heat dissipation plate and the first electronic component. In addition, the insulation glue of the second package module may also cover and lean against the insulation film to press the foam glue body through the base material so as to deform the foam glue body and enable the foam glue body to cover the second electronic component.

In this way, the second electronic component located around the first electronic component may be effectively covered and protected by the foam glue body. For the liquid metal that may overflow due to being pressed, the insulation glue and the insulation film may have the effects of isolation and protection to protect the second electronic component or the circuit on the substrate from contacting the liquid metal and causing a short circuit so as to have the effects of both heat dissipation and protection.

In addition, the above-mentioned components form multiple spaces annularly disposed layer by layer between the substrate and the heat dissipation plate. The first electronic component is located in the innermost space, and the remaining spaces are all arranged as annularly disposed layer by layer relative to the innermost space. Accordingly, the spaces may be used for the overflow of the liquid metal. The second electronic component and the upper surface of the substrate may be isolated from the overflow of the liquid metal by the protection of the insulation glue and the insulation film. In addition, the porous structure of the foam as one of the barrier structures may also be used to adsorb the liquid metal and prevent the liquid metal from overflowing outside of the electronic package structure.