How to Accurately Calculate the Load Capacity of LED Display Receiving Cards?

How to Accurately Calculate the Load Capacity of LED Display Receiving Cards?

In LED display projects, selecting the right receiving card and determining its load capacity is crucial. Underloading can cause insufficient performance, while overloading increases costs unnecessarily.

💡 Accurately calculating receiving card load capacity helps optimize the number of cards used, ensuring the best performance while minimizing costs.

🔹 Key Factors Affecting Receiving Card Load Capacity

The load capacity of an LED display receiving card depends on two main factors:
✅ Total pixel load capacity of the receiving card
✅ Data group mode supported by the card

Common Connection Methods for Receiving Cards and Modules:
1️⃣ Modules connected in a daisy-chain (horizontal cascade connection)
2️⃣ Modules connected in a split configuration (double-ended connection)

📌 Step-by-Step Method for Choosing a Receiving Card

1️⃣ Selecting the Right Receiving Card Model

1️⃣ Determine the number of HUB ports required:

• If module rows ≤ 8: Choose an 8-HUB port receiving card (e.g., DH7508)
• If module rows ≤ 12: Choose a 12-HUB port receiving card (e.g., DH7512)
• If module rows ≤ 16: Choose a 16-HUB port receiving card (e.g., DH7516)

2️⃣ Check the pixel resolution per module and compare it with the total pixel load capacity of the receiving card.

2️⃣ Load Calculation Methodology

Once the receiving card model is selected, the next step is to determine the number of receiving cards required.

• Determine how many LED modules one HUB port can support
• If one HUB port cannot fully support a module, consider:
  ✅ Adding additional receiving cards
  ✅ Using a higher-capacity receiving card

🔹 Calculation Examples

📌 Example 1: Using DH7512 Receiving Card

• LED Module: 104 × 52 pixels
• Standard HUB75E Interface
• Working Mode: 2 Data Groups
• Receiving Card Used: DH7512

💡 Step-by-step Calculation:
✔ DH7512 Specs:

• 12 HUB Ports
• Total Load Capacity: 512 × 512 pixels
• Supports up to 24 data groups

✔ Max pixels per data group:

$$(512\times 512)/24=10,922\text{ pixels}$$

✔ Max pixels width per module:

$$10,922/(52/2)=420\text{ pixels}$$

✔ Max modules per HUB port:

$$420/104=4\text{ modules}$$

✔ Total receiving card capacity:

$$12\times 4=48\text{ modules}$$

• Total pixels supported: 416 × 624 pixels
• 🔹 Conclusion: 1 DH7512 card supports 48 modules.

📌 Example 2: Using DH7508 Receiving Card

• LED Module: 160 × 80 pixels
• Standard HUB75E Interface
• Working Mode: 2 Data Groups
• Receiving Card Used: DH7508

💡 Step-by-step Calculation:
✔ DH7508 Specs:

• 8 HUB Ports
• Total Load Capacity: 256 × 256 pixels
• Supports up to 16 data groups

✔ Max pixels per data group:

$$(256\times 256)/16=4,096\text{ pixels}$$

✔ Max pixels width per module:

$$4,096/(80/2)=102\text{ pixels}$$

✔ Max modules per HUB port:

$$102/160<1\Rightarrow \text{Each HUB port can only support 1 module}$$

✔ Total receiving card capacity:

$$8\times 1=8\text{ modules}$$

• Total pixels supported: 160 × 640 pixels
• 🔹 Conclusion: 1 DH7508 card supports 8 modules.

📌 Example 3: Using DH7516 Receiving Card

• LED Module: 160 × 80 pixels
• Standard HUB75E Interface
• Working Mode: 2 Data Groups
• Receiving Card Used: DH7516

💡 Can it handle:

• 480 × 560 pixels? ❌ No
• 640 × 400 pixels? ✅ Yes
• 480 × 480 pixels? ✅ Yes

✔ DH7516 Specs:

• 16 HUB Ports
• Total Load Capacity: 512 × 512 pixels
• Supports up to 32 data groups

✔ Checking feasibility:
1️⃣ 480 × 560 pixels (Failed Test)

• Total Pixels: 268,800 pixels
• DH7516 supports only 262,144 pixels
• ❌ Exceeds maximum load capacity

2️⃣ 640 × 400 pixels (Passed Test)

• Total Pixels: 256,000 pixels
• DH7516 supports 262,144 pixels
• ✅ Load capacity sufficient

3️⃣ 480 × 480 pixels (Passed Test)

• Total Pixels: 230,400 pixels
• DH7516 supports 262,144 pixels
• ✅ Load capacity sufficient

🔹 Summary & Optimization Tips

✔ Choose the right receiving card model based on the LED module resolution and HUB port configuration.
✔ Optimize the use of receiving cards to minimize costs.
✔ Always check the pixel load per data group.
✔ If one HUB port cannot fully support a module, either add another card or use a higher-capacity receiving card.

✅ Using these methods, you can accurately determine the number of receiving cards required for your LED display project, ensuring both performance and cost efficiency! 🚀