creative flexible LED video wall

If you want a stable LED display system, you must size your sending card ports and receiver cards correctly . Undersizing leads to black screens or flickering; oversizing wastes budget.

This guide gives you a practical, engineering-grade method to calculate everything accurately.

Step One: Calculate Total Screen Pixels

Always start here. Every decision depends on total pixel count.

Formula

Total Pixels = Horizontal Pixels × Vertical Pixels

Break it down further:

• Horizontal Pixels = Module Width (pixels) × Number of Modules (horizontal)
• Vertical Pixels = Module Height (pixels) × Number of Modules (vertical)
• Example

Module:

• 128 × 64

Layout:

• 10 (W) × 8 (H)

Calculation:

• Horizontal = 128 × 10 = 1280
• Vertical = 64 × 8 = 512
• Total Pixels = 1280 × 512 = 655,360 pixels

Sending Card Capacity (Ethernet Port Load)

The sending card determines how many pixels your system can drive.

Theoretical Capacity per Port

Gigabit Ethernet port (1Gbps):

• ~
• 655,360 pixels @ 60Hz

30Hz mode (if supported):

• ~
• 1,050,000 pixels per port
• 2.2 Effective Capacity (Real-World Adjustment)

Higher refresh rates consume more bandwidth, so you must apply a reduction factor.

Engineering Coefficients Refresh Rate

Coefficient ≤1920Hz ×1.0 2000–3000Hz ×0.8 ≥3840Hz ×0.6 Example (3840Hz)

Effective Load = 655,360 × 0.6 = 393,216 pixels per port

Total Sending Card Capacity

Total Capacity = Number of Ports × Effective Load per Port Example

Sending card:

• 4 ports

Refresh rate:

• 3840Hz

Calculation:

• Total = 4 × 393,216 = 1,572,864 pixels

Receiver Card Capacity (Per Card)

Receiver cards distribute data to LED modules. You must respect both pixel limits and dimension limits .

Common Receiver Card Specs

Type

Max Pixels

Standard (HUB75)

256 × 128 = 32,768 Enhanced (HUB75E)

512 × 256 = 131,072 Large-capacity 1024 × 256 = 262,144 Dimension Constraints (Critical)

A receiver card must satisfy BOTH:

• Horizontal pixels ≤ max horizontal limit
• Vertical pixels ≤ max vertical limit
• Example

Receiver card:

• 256 × 128

Module:

• 128 × 64

Max modules per card:

• Horizontal: 256 ÷ 128 = 2
• Vertical: 128 ÷ 64 = 2
• Max load = 2 × 2 = 4 modules per receiver card

Full System Validation (Most Important Step)

Now verify that your entire system is balanced.

You MUST satisfy all three conditions:

Total Screen Pixels ≤ Sending Card Capacity Pixels per Port ≤ Single Port Capacity Pixels per Receiver Card ≤ Receiver Card Limit Example Check

Screen:

• 1280 × 512 = 655,360 pixels

Refresh rate:

• 3840Hz

Single port capacity:

• 393,216 pixels

Result:

• 655,360 > 393,216 → One port is NOT enough

Solution: Use

2 ports

Fast Engineering Rules (Field-Proven)

Use these quick rules for rapid estimation:

• Sending Card (Gigabit Port)
• ~650K pixels per port @ 60Hz

High refresh (≥3840Hz):

• → Use
• 60%–80% of capacity

Receiver Card

256 × 128 → Standard 512 × 256 → High-performance

Golden Rule

Always calculate total pixels first—then match ports and receiver cards accordingly

Conclusion

Accurate LED system design follows a clear hierarchy:

Pixels → Ports → Receiver Cards

If you skip this logic, you risk:

• Overloading ports → flickering, black screens
• Overloading receiver cards → partial display failure
• Poor system stability

On the other hand, if you size everything correctly, your LED display will run:

• Stable
• Efficient
• Scalable