Fan-out LED packaging structure and method

The present disclosure provides fan-out LED packaging structures and methods. The fan-out LED packaging structure at least comprises: an LED wafer, a packaging layer, a first redistribution layer, an IC control chip module, and a second redistribution layer. The LED wafer and the IC control chip module use metal wires of the first and second redistribution layers and metal-plated holes of the packaging layer to lead out and to control the LED wafer and the IC control chip. The present disclosure also provides fan-out LED packaging methods. The methods adopt metal plating in place of wire bonding, and adopt PI dielectric layers and rewiring layers in place of a base substrate, thus effectively reducing the LED package size.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims the benefit of priority to Chinese Patent Application No. CN 2020109865996, entitled “FAN-OUT LED PACKAGING STRUCTURE AND METHOD”, and Chinese Patent Application No. CN 2020220589170, entitled “FAN-OUT LED PACKAGING STRUCTURE”, both filed with CNIPA on Sep. 18, 2020, the disclosures of which are incorporated herein by reference in their entirety for all purposes.

FIELD OF TECHNOLOGY

The present disclosure generally relates to LED packaging, in particular, to a fan-out LED packaging structure and method.

BACKGROUND

Liquid crystal displays (LCDs) and RGB light-emitting-diodes (RGBLEDs) are commonly used in large outdoor display screens. Traditional LCDs have the advantage of high resolution, but splicing multiple LCD panels is needed to obtain a large outdoor LCD screen, which often results in large gaps between the panels, affecting the visual effect of the large screen. For consumer electronic screens, the RGBLEDs are preferred because they have better color reproduction and no splicing gaps. However, traditional LEDs require package bodies to have a large package size and large spacing therebetween demanded by heat dissipation, which results in low resolution.

Thus the key to improving the resolution of LED screens is to reduce the package size. Due to the use of bonding wires and base substrates, the traditional LED packaging usually results in a large package size and thickness. As the key to improving the market competitiveness of LED screens, reducing the package size has remained a technical difficulty in the field.

SUMMARY

In a traditional LED packaging method, an LED chip and an IC control chip module are respectively first die-bonded on two sides of a base substrate, and then electrical properties are introduced into the base substrate through bonding wires of the LED chip. The circuits within the substrate are used to communicate with the IC chip module to achieve LED circuit control. A disadvantage of the traditional LED packaging method is that the use of the base substrate and the bonding wires in the packaging structure results in a large package size and thickness, which is not conducive to the improvement of display resolution.

The present disclosure includes: an fan-out LED packaging structure, the fan-out LED packaging structure at least includes an LED wafer which includes a first surface and a second surface, wherein the first surface is plated with electrodes; a packaging layer encloses a lateral side and the first surface of the LED wafer; a first redistribution layer includes a polyimide (PI) dielectric layer and first metal wires embedded in the PI dielectric layer, the first redistribution layer includes a first surface and a second surface opposite to the first surface, the LED wafer is bonded to the second surface of the redistribution layer, the electrodes on the first surface of the LED wafer are connected to the first metal wires of the first redistribution layer by means of perforated metal-plated electrodes disposed in the packaging layer; an IC control chip module includes an IC control chip, metal bumps, a thermally conductive adhesive, and a heat sink; an IC control chip includes a first surface and a second surface opposite to the first surface, herein the first surface includes electrodes, metal bumps formed on the electrodes, thermally conductive adhesive, and a heat sink successively disposed on the second surface; an IC control chip module being mounted to the metal bumps on the second surface of the first redistribution layer, so the IC control chip module is electrically connected to the LED wafer through the first redistribution layer; and a second redistribution layer includes a second PI dielectric layer and second metal wires in the second PI dielectric layer, herein the second metal wires of the second redistribution layer are connected to the second surface of the LED wafer, and also are connected to the first metal wires of the first redistribution layer for leading out and controlling the LED wafer and the IC control chip.

Optionally, the material of the packaging layer includes one of silica gel, polyimide, and epoxy resin.

Optionally, the metal wires include one of copper, gold, and silver wires, the LED metal electrodes include one of copper, gold, and silver electrodes, and the metal bumps include one of a tin solder, a silver solder, and a gold-tin alloy solder.

The present disclosure also provides a fan-out LED packaging method, the method includes steps: 1) providing a support substrate; 2) forming a separation layer on the support substrate; 3) providing an LED wafer including a first surface and a second surface, the first surface being plated with electrodes, and fixing the second surface of the LED wafer to the separation layer such that the electrodes on the first surface of the LED wafer face away from the separation layer; 4) packaging the LED wafer by a packaging layer such that the first surface and the periphery of the LED wafer are enclosed by the packaging layer, the packaging layer at the periphery of the LED wafer being in contact with the separation layer; 5) drilling holes in the packaging layer on the side of the first surface of the LED wafer such that surfaces are exposed at specific portions of the first surface of the LED wafer and on the separation layer; 6) plating to form LED metal electrodes such that surfaces of the packaging layer, exposed portions of the first surface of the LED wafer, and exposed portions of the separation layer are covered by continuous metal materials; 7) forming a first redistribution layer on the packaging layer on the side of the first surface of the LED wafer, the first redistribution layer including a first PI dielectric layer and first metal wires, wherein the first PI dielectric layer and the first metal wires are stacked alternately, the first PI dielectric layer also fills holes formed when drilling the packaging layer, the first metal wires are connected to the LED metal electrodes exposed at the packaging layer; 8) stripping the support substrate from the packaged LED wafer along with the separation layer, to expose the packaging layer, the LED metal electrodes at the drilled locations of the packaging layer, and the second surface of the LED wafer; 9) forming a second redistribution layer on the second surface of the LED wafer, the second redistribution layer including second PI dielectric layer and second metal wires in the second PI dielectric layer, the second metal wires of the second redistribution layer being connected to the first metal wires of the first redistribution layer to lead out the LED wafer and the LED metal electrodes; and 10) surface-mounting an IC control module with a heat sink to the first redistribution layer.

Optionally, the LED wafer is packaged with the packaging layer by one of compression molding, transfer molding, liquid seal molding, vacuum lamination, and spin coating.

Optionally, the separation layer includes a light-to-heat conversion layer.

Optionally, the support substrate includes one of a glass substrate, a metal substrate, a semiconductor substrate, a polymer substrate, and a ceramic substrate.

Optionally, step 7) includes: 7-1) placing a PI dry film with a release film on the packaging layer on the first surface of the LED wafer; 7-2) performing vacuum hot pressing so that the PI film shrinks to fit the packaging layer and fills the holes at the drilled locations, and peeling off the release film; and 7-3) performing lithographic resist exposure and development to expose metal materials at specific portions of the surface of the packaging layer.

The present disclosure also provides a fan-out packaging structure, including: an IC control wafer module, the IC control wafer module including an IC control wafer, the IC control wafer including a first surface and a second surface, the first surface having electrodes with copper lead posts formed thereon, the first surface having PI dielectric materials that packages the electrodes and the metal lead posts, with top surfaces of the metal lead posts being exposed; a first packaging layer enclosing the periphery of the IC control wafer module, wherein a thermally conductive adhesive and a heat sink are successively mounted to the second surface of the IC control wafer; a first redistribution layer including a first PI dielectric layer and first metal wires in the first PI dielectric layer, the first redistribution layer including a first surface and an opposite second surface, wherein the first metal wires run through the first surface and the second surface; the first metal wires are provided on the surface of the second surface, and tall copper posts are formed on the metal wires on the surface of the second surface; the IC control wafer module is tightly attached to the first surface of the first redistribution layer; and the metal lead posts of the IC control wafer module are connected to the first metal wires exposed on the first surface of the first redistribution layer; an LED wafer module, the LED wafer module including an LED control wafer, the LED control wafer including a first surface and a second surface, the first surface having electrodes, the second surface having PI dielectric materials that packages the electrodes and metal lead posts, with top surfaces of the metal lead posts being exposed; a second packaging layer enclosing the periphery of the LED wafer module and the periphery of the tall copper posts, wherein the first surface of the LED wafer is tightly attached to the second surface of the first redistribution layer; the electrodes on the first surface of the LED wafer are coupled with the first metal wires exposed on the second surface of the first redistribution layer and are connected to the IC control wafer module via the first metal wires; and the electrodes on the first surface of the LED wafer are not coupled with the first metal wires on the second surface of the first redistribution layer; and a second redistribution layer including a second PI dielectric layer and second metal wires in the second PI dielectric layer, the second redistribution layer being formed on the second surface of the LED wafer, wherein the second metal wires connect the metal lead posts on the second surface of the LED wafer and the tall copper posts in the second packaging layer, and lead out the IC wafer module through the tall copper posts and the first metal wires of the first redistribution layer; and the second metal wires on the surface of the second redistribution layer are configured for Surface Mounted Devices (SMDs).

The present disclosure also provides a fan-out LED packaging method, the packaging method including steps of: 1) providing a support substrate; 2) forming a separation layer on the support substrate; 3) providing an IC control wafer module including an IC control wafer, the IC control wafer including a first surface and a second surface, the first surface being provided with packaged electrodes and metal lead posts, and die-bonding the second surface of the IC control wafer to the separation layer such that the electrodes on the first surface of the IC control wafer face away from the separation layer; 4) packaging the IC control wafer module with a first packaging layer, such that the periphery and the surface facing away from the separation layer of the IC control wafer module are enclosed by the first packaging layer, the first packaging layer at the periphery of the IC control wafer module being in contact with the separation layer; 5) grinding the first packaging layer on the first surface of the IC control wafer such that the metal lead posts on the first surface of the IC control wafer module are exposed; 6) forming a first redistribution layer on the surface being ground in step 5), the first redistribution layer including alternately stacked patterned first PI dielectric layer and patterned first metal wires, the first metal wires being connected to the metal lead posts on the first surface of the IC control wafer module; 7) forming tall copper posts at specific portions of the first metal wires of the first redistribution layer to lead out the IC control wafer module; 8) providing an LED wafer module including an LED wafer, the LED wafer including a first surface and a second surface, the first surface being provided with electrodes, the second surface being provided with packaged metal lead posts, and die-bonding the first surface of the LED wafer to the first redistribution layer such that the electrodes on the first surface are connected to the first metal wires of the first redistribution layer, and the metal lead posts on the second surface of the LED wafer face away from the first redistribution layer; (9) packaging the first redistribution layer, the LED wafer module and the tall copper posts with a second packaging layer; 10) grinding the second packaging layer such that the metal lead posts on the first surface of the LED wafer and the tall copper posts on the first redistribution layer are exposed; 11) forming a second redistribution layer on the face being ground in step 10), the second redistribution layer including alternately stacked patterned second PI dielectric layer and patterned second metal wires, the second metal wires being connected to the metal lead posts on the first surface of the LED wafer and top surfaces of the tall copper posts on the first redistribution layer; 12) stripping the support substrate along with the separation layer to expose the second surface of the IC control wafer; 13) applying a thermally conductive adhesive on the second surface of the IC control wafer; 14) mounting a heat sink on the thermally conductive adhesive; and 15) performing wafer cutting to obtain the final fan-out LED packaging structure.

As described above, the fan-out LED packaging structure and method of the present disclosure have the following beneficial effect: by adopting the fan-out packaging method, using the metal plating in place of wire bonding, and using the PI dielectric layers and rewiring layers in place of a base substrate, the package size is effectively reduced.

DETAILED DESCRIPTION

Embodiments of the present disclosure will be described below with specific examples, and other advantages and effects of the present disclosure may be easily understood by those skilled in the art from the disclosure in the specification. The present disclosure may also be carried out or applied in other embodiments, and various modifications or changes may also be made to the details in the specification based on different ideas and applications without departing from the spirit of the present disclosure.

As in the detailed description of the embodiments of the present disclosure, for convenience of description, cross-sectional views illustrating device structures are partially enlarged not necessarily to scale, and the schematic diagrams are only examples, which should not limit the scope of the present disclosure herein. In addition, length, width and depth three-dimensional space sizes should be considered in the actual fabrication.

For ease of description, spatial relationship terms such as “beneath”, “below”, “lower than”, “under”, “above”, and “on” may be used herein to describe a relationship between one element or feature and other elements or features shown in the drawings. It will be appreciated that these spatial relationship terms are intended to encompass directions of a device in use or operation other than directions depicted in the drawings. In addition, when a layer is referred to as being “between” two layers, it may be the only layer between the two layers, or there may be one or more layers therebetween.

Referring toFIGS.1-32, it is to be noted that drawings provided in the embodiments only schematically illustrate the basic idea of the present disclosure, so the drawings only show components related to the present disclosure, and are not drawn according to the numbers, shapes and sizes of the components in actual implementation; the forms, numbers and proportions of the components in actual implementation may be adjusted as needed; and the layout of the components may be more complex.

A schematic diagram of a conventional packaging structure is shown inFIG.1. An LED wafer301is die-bonded to one side of a base substrate900through an adhesive307, and electrical elements are introduced to the base substrate900through bonding wires306; an IC control wafer701is die-bonded to the other side of the base substrate900, and is connected to circuitry inside the base substrate900and coupled with the LED wafer301through metal bumps704to achieve LED circuit control; and a thermally conductive adhesive702and a heat sink703are successively mounted to a side of the IC control wafer701facing away from the base substrate900. A disadvantage of such a structure is that the use of the base substrate and the outer bonding wires in the packaging structure results in a large package size and thickness, which is not conducive to the improvement of display resolution.

As shown inFIGS.2-16, the present disclosure provides a fan-out LED packaging method, the packaging method includes the steps described below.

As shown inFIG.2, step 1) is performed first. A support substrate100is provided. The support substrate includes one of a glass substrate, a metal substrate, a semiconductor substrate, a polymer substrate, and a ceramic substrate.

As shown inFIG.3, next, step 2) is performed. A separation layer200is formed on the support substrate. The separation layer includes a light-to-heat conversion layer, which is formed on the support substrate by a spin coating process and then cured by a curing process. The light-to-heat conversion layer has stable properties and a smooth surface, and is easy to peel off in a subsequent stripping process.

As shown inFIG.4, then the method proceeds to step 3). An LED wafer301is provided, which includes a first surface and a second surface, the first surface being plated with electrodes. The electrodes may be copper electrodes, gold electrodes or silver electrodes. The second surface of the LED wafer is fixed to the separation layer200such that the electrodes on the first surface of the LED wafer face away from the separation layer200.

As shown inFIG.5, then the method proceeds to step 4). The LED wafer301is packaged by a packaging layer302such that the first surface and the periphery of the LED wafer301are enclosed by the packaging layer, herein the packaging layer302at the periphery of the LED wafer301is in contact with the separation layer200. The material of the packaging layer includes one of silica gel, polyimide, and epoxy resin. The LED wafer is packaged with the packaging layer by one of compression molding, transfer molding, liquid seal molding, vacuum lamination, and spin coating.

As shown inFIG.6, then the method proceeds to step 5). Laser drilling is performed on the packaging layer302on the first surface of the LED wafer301such that specific portions of the first surface of the LED wafer301and on the separation layer200are exposed.

As shown inFIG.7, then the method proceeds to step 6). LED metal electrodes304are plated such that the surface of the packaging layer302, the exposed portions on the first surface of the LED wafer301, and the exposed portions on the separation layer200are covered by continuous metal materials. The LED metal electrodes304include one of copper electrodes, gold electrodes, and silver electrodes.

As shown inFIGS.8to10, then the method proceeds to step 7. A first PI dielectric layer401is formed on the packaging layer on the first surface of the LED wafer301, and the holes at the laser drilled locations of the packaging layer are filled, and lithographic resist exposure and development are performed to expose metal at the specific locations of the packaging layer. As shown inFIG.8, a PI dry film401with a release film403is placed on the packaging layer302on the side of the first surface of the LED wafer301. As shown inFIG.9, vacuum hot pressing is performed so that the PI film401is fit to the packaging layer302and fills the holes at the laser drilled locations, and the release film403is peeled off. As shown inFIG.10, lithographic resist exposure and development are performed to expose metal at the specific locations of the packaging layer304.

As shown inFIG.11, then the method proceeds to step 8). A first metal wiring layer402is formed on the first PI dielectric layer (PI dry film)401by lithographic resist exposure, development, plating and etching process. The first PI dielectric layer401and the first metal wires402are stacked alternately (the repeating structures are not shown in the figures), and the first PI dielectric layer401and the first metal wires402form a first redistribution layer. The first metal wires402are connected to the substrates LED metal electrodes304exposed at the packaging layer302. The metal wires402include one of copper wires, gold wires, or silver wires.

As shown inFIG.12, then the method proceeds to step 9). PI dielectric material501is disposed on the first redistribution layer, and lithographic resist exposure and development are performed to expose the metal wires402on the first redistribution layer.

As shown inFIG.13, then the method proceeds to step 10). The support substrate100is peeled off from the packaged LED wafer301, along with the separation layer200, to expose the packaging layer302, the LED metal electrodes304at the drilled locations of the packaging layer, and the second surface of the LED wafer301.

As shown inFIGS.14-15, then the method proceeds to steps 11). A second redistribution layer is formed on the side of the second surface of the LED wafer, wherein the second redistribution layer includes a second PI dielectric layer601and second metal wires602in the second PI dielectric layer, the second metal wires of the second redistribution layer602is connected to the first metal wires402of the first redistribution layer to lead out the LED wafer301and the LED metal electrodes304.

As shown inFIG.16, then the method proceeds to step 12). An IC control module with a heat sink is surface mounted to the first redistribution layer.

As shown inFIG.16, the present disclosure also provides a fan-out LED packaging structure including: an LED wafer301which has a first surface and a second surface, herein the first surface is pattern-plated with LED metal electrodes, the LED metal electrodes include one of copper electrodes, gold electrodes, and silver electrodes; a packaging layer302which encloses a lateral side and the first surface of the LED wafer, herein the material of the packaging layer includes one of silica gel, polyimide, and epoxy resin; a first redistribution layer includes the first PI dielectric layer401and the first metal wires402in the first PI dielectric layer, the first redistribution layer402includes a first surface and a second surface opposite of the first surface, herein the LED wafer301is bonded to the second surface of the redistribution layer, the electrodes on the first surface of the LED wafer301is connected to the first metal wires402of the first redistribution layer, a layer of perforated metal-plated electrodes304is disposed in the packaging layer302; an IC control chip module includes an IC control chip701, metal bumps704, a thermally conductive adhesive702, and a heat sink703. Herein the IC control chip701includes a first surface and an opposite second surface, the first surface contains electrodes, the metal bumps704are formed on the electrodes of the first surface, the metal bumps include one of a tin solder, a silver solder, and a gold-tin alloy solder, the thermally conductive adhesive702and the heat sink703are successively disposed on the second surface. Herein the IC control chip module is mounted to the second surface of the first redistribution layer via metal bumps704to electrically connect the LED wafer to the IC control chip module through the metal wires402of the first redistribution layer. The thermally conductive adhesive includes one of an organosilicone-based thermally conductive adhesive, an epoxy-based thermally conductive adhesive, a polyurethane-based thermally conductive adhesive, and a PI-based thermally conductive adhesive; and a second redistribution layer which includes a second PI dielectric layer601and second metal wires602in the second PI dielectric layer, the second redistribution layer is formed on the second surface of the LED wafer, with the second metal wires602of the second redistribution layer is electrically connecting to the first metal wires402of the first redistribution layer to lead out and control the LED wafer301and the IC control chip701.

As shown inFIGS.17-32, another fan-out LED packaging method according to the present disclosure is provided, the packaging method includes the following steps:

As shown inFIG.17, step 1) is performed first. A support substrate100is provided. The support substrate may be one of a glass substrate, a metal substrate, a semiconductor substrate, a polymer substrate, and a ceramic substrate.

As shown inFIG.18, then it proceeds to step 2). A separation layer200is formed on the support substrate. The separation layer includes a light-to-heat conversion layer, which is formed on the support substrate by a spin coating process and then cured by a curing process.

As shown inFIG.19, then it proceeds to step 3). An IC control wafer module is provided. The module includes an IC control wafer701, the IC control wafer701including a first surface and a second surface, the first surface being provided with electrodes and metal lead posts705packaged by PI dielectric materials706. The second surface of the IC control wafer701is die-bonded to the separation layer200such that the electrodes on the first surface of the IC control wafer701face away from the separation layer200. The chip electrodes include one of copper electrodes, gold electrodes, and silver electrodes.

As shown inFIG.20, then it proceeds to step 4). The IC control wafer module is packaged by a first packaging layer707, such that the periphery and the surface of the IC control wafer module facing away from the separation layer are enclosed by the first packaging layer707, the first packaging layer707at the periphery of the IC control wafer module being in contact with the separation layer200. The material of the packaging layer includes one of silica gel, polyimide and epoxy resin.

As shown inFIG.21, then it proceeds to step 5). The first packaging layer707on the first surface of the IC control wafer module is ground such that the top surfaces of the metal lead posts705on the first surface of the IC control wafer module are exposed.

As shown inFIGS.22-23, then it proceeds to step 6). A first redistribution layer is disposed on the surface which were ground, herein the first redistribution layer includes a first PI dielectric layer401and the first metal wires402formed by lithographic resist exposure and development, plating and etching process. The first metal wires402are connected to the metal lead posts706on the first surface of the IC control wafer701.

As shown inFIG.24, then it proceeds to step 7). Tall copper posts801are formed at specific portions of the first metal wires of the first redistribution layer to lead out electrical properties of the IC control wafer module. In one embodiment, the tall copper posts may be formed by spot soldering or reflow soldering.

As shown inFIG.25, it proceeds to step 8). An LED wafer module is provided. The module includes an LED wafer301, which includes a first surface and a second surface, the first surface is provided with electrodes, the second surface is provided with metal lead posts303packaged by PI dielectric materials305. The first surface of the LED wafer301are die-bonded to the first redistribution layer such that the electrodes on the first surface of the LED wafer301are connected to the first metal wires402of the first redistribution layer, and the metal lead posts303on the second surface of the LED wafer module face away from the first redistribution layer.

As shown inFIG.26, then it proceeds to step 9). The first redistribution layer, the LED wafer module and the tall copper posts801are packaged by a second packaging layer302.

As shown inFIG.27, then it proceeds to step 10). The second packaging layer302is ground such that the metal lead posts303on the first surface of the LED wafer301and the tall copper posts801on the first redistribution layer are exposed.

As shown inFIGS.28-29, it proceeds to step 11). A second redistribution layer is formed on the face which was ground, the second redistribution layer including a second PI dielectric layer601formed by lithographic resist exposure and development and second metal wires602formed by an exposure, development, plating and etching process, the second metal wires602being connected to the metal lead posts303on the first surface of the LED wafer301and the tall copper posts801on the first redistribution layer.

As shown inFIG.30, then it proceeds to step 12). The support substrate100is peeled off along with the separation layer200to expose the second surface of the IC control wafer701.

As shown inFIG.31, then it proceeds to step 13). A thermally conductive adhesive702is applied on the second surface of the IC control wafer701.

As shown inFIG.32, then it proceeds to step 14). A heat sink703is mounted to the thermally conductive adhesive702, and wafer cutting is performed to obtain the final fan-out LED packaging structure.

As shown inFIG.32, the present disclosure also provides a fan-out LED packaging structure, the packaging structure including: an IC control wafer module, the IC control wafer module includes an IC control wafer701, the IC control wafer701includes a first surface and a second surface, the first surface has electrodes with copper lead posts705formed thereon, the first surface also has PI dielectric materials706that packages the electrodes and the metal lead posts705, herein the top surfaces of the metal lead posts705are exposed; a first packaging layer707encloses the periphery of the IC control wafer module, wherein a thermally conductive adhesive702and a heat sink703are successively mounted to the second surface of the IC control wafer701, herein the thermally conductive adhesive includes one of an organosilicone-based thermally conductive adhesive, an epoxy-based thermally conductive adhesive, a polyurethane-based thermally conductive adhesive, and a PI-based thermally conductive adhesive; a first redistribution layer includes a first PI dielectric layer401and first metal wires402in the first PI dielectric layer, the first redistribution layer includes a first surface and an opposite second surface, wherein the first metal wires402run through the first surface and the second surface; the metal wires402are provided on the surface of the second surface, and tall copper posts801are formed on the first metal wires402on the surface of the second surface; the IC control wafer module is tightly attached to the first surface of the first redistribution layer; and the metal lead posts705of the IC control wafer module are connected to the first metal wires402exposed on the first surface of the first redistribution layer; an LED wafer module, the LED wafer module includes an LED control wafer301, the LED control wafer301includes a first surface and a second surface, the first surface having electrodes, the first surface having PI dielectric materials305that packages the electrodes and metal lead posts303, with top surfaces of the metal lead posts303being exposed; a second packaging layer enclosing the periphery of the LED wafer module and the periphery of the tall copper posts801, wherein the first surface of the LED wafer301is tightly attached to the second surface of the first redistribution layer; the electrodes on the first surface of the LED wafer301are coupled with the first metal wires402exposed on the second surface of the first redistribution layer and are connected to the IC control wafer module via the first metal wires402; and the electrodes on the first surface of the LED wafer301are not electrically connected to the metal wires402on the second surface of the first redistribution layer; and a second redistribution layer including a second PI dielectric layer601and second metal wires602in the second PI dielectric layer, the second redistribution layer being formed on the second surface of the LED wafer301, wherein the second metal wires602connect the metal lead posts305on the second surface of the LED wafer301and the tall copper posts801in the second packaging layer, and lead out the IC wafer module through the tall copper posts801and the through metal wires402of the first redistribution layer; and the second metal wires602on the surface of the second redistribution layer are configured for surface mounting of SMDs.

In summary, in the present disclosure, the fan-out packaging method is used for LED packaging, metal plating is used in place of wire bonding, and the PI dielectric layers and wirings are used in place of a base substrate, which effectively reduces the LED package size, thus improving the display resolution.

The above embodiments are merely illustrative of the principles of the present disclosure and effects thereof, and are not intended to limit the present disclosure. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with general knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure are still covered by the claims of the present disclosure.