Earlier chips were small. So companies used round silicon wafers to make and package them. It worked fine for many years. But now things are different.
Today AI chips, 5G devices, fast computers, and smart electronics all need bigger and more powerful chips. Because of this the old round wafer system is becoming slow and expensive. So the semiconductor industry started using something called Panel Level Packaging or PLP.
Instead of round wafers PLP uses large rectangular panels. Think of it like fitting more chocolates in a square box instead of a round plate. That is why precision measurement has become very important in modern semiconductor manufacturing.
What Is Panel Level Packaging (PLP)?
Earlier semiconductor companies used round silicon wafers to make and package chips. But round wafers waste space near the edges. PLP changes this idea.
Instead of round wafers, companies now use large rectangular panels. These panels have more usable space. So more chips can fit at the same time. This helps companies manufacture more chips faster and improve production speed.
This is very important today because AI chips and high-performance computing systems are becoming larger and more powerful.
Why the Semiconductor Industry Is Moving Towards PLP
Today your phone, AI tools, games, cars and even smart watches need very powerful chips. But here is the problem. These chips are getting bigger and more complex every year.
Older wafer packaging works on round silicon wafers. That was fine before. But now companies want to fit more chips together and move data faster. Round wafers waste space near the edges. They also struggle with very large AI chip packages.
So the semiconductor industry started moving toward Panel Level Packaging or PLP.
PLP uses large rectangular panels instead of round wafers. Think of it like packing books in a square box instead of a round bag. You can fit more inside with less wasted space.
That is why PLP is becoming important for AI chips. High-performance computing. And next-generation electronics.
Types of Panel Level Packaging
1. Fan-Out Panel Level Packaging (FOPLP)
In Fan-Out Panel Level Packaging or FOPLP, tiny semiconductor chips are placed on a large panel. Then they are covered safely with molding material. After that small metal connection paths called Redistribution Layers or RDLs connect everything. Advanced lithography then draws super small patterns to help signals move fast.
This method helps make thinner and faster chip packages that also handle heat better. Because the panel is bigger more chips can be made at one time. That saves cost and improves production speed.
2. Embedded Die Panel Packaging
In Embedded Die Panel Packaging, basically the semiconductor die goes inside the panel structure itself. This process makes the package thinner, stronger and also more compact. Here signals also travel through shorter paths that improve performance.
Reliability becomes better too because the chip stays protected inside the material. This technology is now used in your automotive electronics, industrial systems and small IoT products. Especially where space is very limited but high performance is still needed.
3. Organic Substrate-Based PLP
These are like flexible working boards used to build semiconductor packages. They are used due to cost-effectiveness. They easily fit into existing chip manufacturing systems. You mostly find them inside consumer electronics and mobile devices.
4. Glass Panel Packaging Technologies
Glass is more flatter and more stable. It also supports much finer semiconductor connections. That makes it useful for AI chips and high-speed computing.
Although glass is harder to handle and easier to damage. So manufacturers need highly accurate process control and precision measurement systems to make sure the entire panel works correctly without cracks or alignment problems.
Panel Level Packaging Process Flow
Did you know making advanced semiconductor packages is a bit like building a tiny smart city? Every layer must fit perfectly. Even a very small mistake can damage the whole chip package. That is why PLP manufacturing needs high precision from the start.
1. Panel Preparation
Everything starts with a large panel. Think of it like a flat platform where chips will be built. This panel can be made from glass or other special materials.
The surface must stay super clean and flat. Even tiny dust particles or small bends can create problems later during lithography and alignment. As panels become larger, keeping the whole surface stable becomes harder.
2. Die Placement
Now small semiconductor chips called dies are placed onto the panel. This step needs extreme accuracy. If even one die moves slightly out of position signal connections may fail later. Now modern manufacturers use automated machines to place thousands of dies very carefully and very fast.
3. Encapsulation and Moulding
Next the dies are covered with moulding material for protection. This keeps the package stable and safe. But there is a problem. Large panels can bend during heating and cooling. This bending is called warpage. Too much warpage can disturb alignment and reduce manufacturing quality.
4. Redistribution Layer Formation
Now tiny metal pathways are created. These are called Redistribution Layers or RDLs. You can think of them like roads connecting different parts of a city. These metal lines must stay very thin and perfectly aligned. If spacing changes even slightly, the chip may not work properly.
5. Lithography and Patterning
Lithography works like printing tiny circuit patterns onto the panel. This stage is very important because all layers must line up correctly across the entire panel surface. As semiconductor designs become smaller and more advanced, lithography becomes much harder.
6. Inspection and Metrology
This step is called inspection and metrology. Special optical systems measure key parameters such as alignment, overlay accuracy, feature size, surface defects and panel distortion.
Large panels are harder to control than normal wafers. Tiny dimensional shifts can create electrical problems or lower manufacturing yield.
7. Singulation and Final Testing
At the end, the finished semiconductor packages are separated from the panel. This step is called singulation. Then every package goes through final testing. Engineers check if the package can handle heat, electrical signals, high-speed performance and real-world operating conditions.
Key Benefits of Panel-Level Packaging
1. PLP uses big rectangular panels instead of round wafers. More chips fit together. So, manufacturers make more chips faster without wasting much production time.
2. Round wafers leave empty corners. Rectangle panels use space better. More chip dies fit properly. This improves semiconductor manufacturing efficiency for AI chip production.
3. When manufacturers make more chips together and waste less material, chip packaging cost goes down. That is why semiconductor companies like PLP technology today.
4. AI and high-performance computing chips are becoming larger every year. PLP supports bigger semiconductor packages and helps companies scale advanced chip manufacturing faster.
5. PLP helps create thin and compact semiconductor packages. This is useful for smartphones, wearable devices, IoT products, and modern consumer electronics with less space.
Challenges in Panel-Level Packaging Manufacturing
a) Panel warpage problem, when you work with large PLP panels, bending becomes a serious issue. During heating, molding, or deposition, the panel can slightly curve. Even small warpage affects lithography accuracy and overlay alignment.
b) Overlay alignment errors also exists. As the panel size increases, maintaining perfect alignment gets much harder. A tiny overlay shift may look small, but it can cause pattern mismatch.
c) Thin Glass Panel Handling. Thin glass panels are extremely sensitive during manufacturing. Small vibration, bending, or edge pressure can damage the structure. That is why automated handling systems must control movement very carefully.
d) Different substrate materials behave differently under heat and moisture. Some expand faster, while others create mechanical stress. This directly affects dimensional stability and process uniformity across the panel.
Role of Precision Metrology in Panel-Level Packaging
i) In PLP manufacturing, small measurement errors create big semiconductor problems. As packages become smaller and more complex, manufacturers need tighter tolerances and more accurate inspection systems.
ii) Critical dimension measurement checks tiny semiconductor features very carefully. Measurements help keep semiconductor manufacturing stable, repeatable, and reliable across high-volume advanced packaging production environments.
iii) In semiconductor packaging, every layer must align perfectly. Even tiny overlay errors can create electrical failures and lower production yield. Advanced metrology systems continuously verify registration accuracy throughout the complete panel-level packaging manufacturing process.
iv) Non-contact optical metrology measures semiconductor structures without physical contact. This protects fragile thin panels and glass substrates from damage.
Future Trends in Panel Level Packaging
Right now, AI is pushing semiconductor packaging very hard. AI chips need larger package structures and better power efficiency. Faster communication and advanced memory integration is also in demand.
Traditional wafer packaging is struggling with scalability, so many manufacturers are now moving toward advanced PLP manufacturing technologies.
Earlier, companies tried building one large semiconductor chip. Now they combine multiple smaller chiplets inside one package structure. This improves yield, scalability, and design flexibility. PLP helps here because large panels support high-density interconnect systems much more efficiently.
Modern PLP manufacturing now depends heavily on automation. You will see robotic handling systems and real-time process monitoring everywhere. Advanced metrology systems continuously check overlay accuracy and critical dimensions. Also, panel warpage and process uniformity during production.
So, the industry is moving toward larger panel formats because they improve throughput and manufacturing efficiency.
บทสรุป
PLP is becoming a big part of modern semiconductor manufacturing. It helps companies improve throughput and scalability. This is used in AI, HPC, automotive electronics and next-generation devices.
But as panel sizes become larger, maintaining lithography accuracy, overlay control, dimensional stability, and process consistency gets much harder. That is why advanced metrology and inspection systemส technologies are now very important in large-scale PLP production.
Get in touch with our team at ViewMM for advanced micro-metrology and inspection systems.