1What Is an LED Processor?
An LED processor (also called an LED video processor or sending controller) is the hardware that receives video signals from sources like media servers or cameras, scales and processes the content, and outputs data to LED panels via sending cards and data cables. It serves as the central hub that translates standard video into the format LED receiving cards understand.
The processor is the brain of any LED video wall system. Without a properly matched processor, your panels will not display anything—they require specific data protocols that only compatible processors provide. Choosing the wrong processor or underspecifying capacity is one of the most common and costly mistakes in LED wall deployments.
This guide helps you make confident processor decisions by understanding capacity calculations, brand differences, and how to match processing power to your specific application. Whether you are specifying a broadcast installation requiring Brompton precision or a touring rig where NovaStar reliability matters, the principles here apply.
What a Processor Actually Does
When video enters an LED processor, it undergoes several stages of transformation before reaching your panels:
Input Handling
Receives HDMI, SDI, DisplayPort signals from cameras, computers, and media servers. Higher-end units accept multiple simultaneous inputs.
Scaling & Processing
Converts source resolution to your exact LED wall pixel dimensions. Applies color correction, brightness mapping, and PIP layouts.
Sending Card Function
Converts processed video into the proprietary data protocol that receiving cards understand. Most modern processors integrate this.
Data Distribution
Outputs data via Ethernet or fiber ports to panel receiving cards. Each port has a maximum pixel capacity that determines wall coverage.
Why Processor Selection Matters
We have seen production teams arrive at venues with incompatible processors—a $50,000 LED wall rendered useless because someone assumed any processor would work. The receiving cards inside your panels only speak one language: Brompton panels require Brompton processing, NovaStar panels require NovaStar sending cards, and so on. There are no exceptions.
Beyond compatibility, processor capacity directly limits what your wall can do. An undersized processor means running at reduced resolution, splitting content across multiple units, or simply discovering mid-show that you cannot drive your full wall. The calculations in this guide prevent those scenarios.
2Processor Architecture
Understanding how processors are built helps you evaluate specs and choose appropriately for your needs. Modern LED processors combine several functional blocks that legacy systems kept separate.
The Signal Chain
Video travels through a defined path from source to panel:
Integrated vs. Standalone Sending
Historically, LED systems used separate components: a video processor for scaling and a sending card (installed in a computer) for protocol conversion. Modern processors integrate both functions, simplifying setup and reducing failure points.
Integrated Processors (Modern)
- Brompton Tessera SX40 - All-in-one processing
- NovaStar VX1000/VX4S - Integrated sending
- Colorlight X20 - Combined functions
- Single box solution, fewer cables
- Simpler configuration and backup
Standalone Sending Cards (Legacy)
- NovaStar MCTRL660 - PCIe card in computer
- NovaStar MCTRL4K - External sending box
- Requires separate processor/scaler
- More components to manage
- Still used for specific applications
Key Capacity Specifications
Every processor has capacity limits defined by two numbers that you must satisfy simultaneously:
- Total pixel capacity - Maximum total pixels the unit can handle (e.g., 8.3 million for NovaStar MCTRL4K, 8 million for Brompton SX40)
- Per-port pixel capacity - Maximum pixels each output port can drive (e.g., 650,000 for NovaStar Gigabit Ethernet, 2 million for Brompton 10G fiber)
A processor might have enough total capacity but insufficient ports, or vice versa. You must calculate both to ensure your wall can be fully driven.
Common Trap: Ignoring Per-Port Limits
A NovaStar MCTRL4K has 8.3 million pixel capacity across 16 ports, but each port only handles 650,000 pixels. A 4K wall (8.3M pixels) requires at least 13 ports to drive, not just one. Always calculate port requirements separately from total capacity.
3Capacity Calculations
Accurate capacity calculation prevents undersizing processors and ensures you have headroom for show changes. This section provides the formulas and real examples you need.
Step 1: Calculate Total Pixel Count
Total Pixels = Wall Width (pixels) x Wall Height (pixels)You can calculate wall resolution two ways:
Method 1: From panel count
Example: 10 panels wide x 6 panels tall, each panel is 192 x 192 pixels
Width: 10 x 192 = 1,920 pixels
Height: 6 x 192 = 1,152 pixels
Total: 1,920 x 1,152 = 2,211,840 pixels
Method 2: From physical dimensions
Example: 8m wide x 4.5m tall at 2.9mm pixel pitch
Width: 8,000mm / 2.9mm = 2,759 pixels
Height: 4,500mm / 2.9mm = 1,552 pixels
Total: 2,759 x 1,552 = 4,281,968 pixels
Step 2: Calculate Port Requirements
Minimum Ports = Total Pixels / Pixels per Port (round up)Per-port capacity varies by processor brand and connection type:
| Processor/Connection | Pixels per Port | Connection Type |
|---|---|---|
| NovaStar (standard) | ~650,000 | Gigabit Ethernet (Cat6) |
| Brompton Tessera | ~2,000,000 | 10G fiber (SFP+) |
| Colorlight (standard) | ~650,000 | Gigabit Ethernet |
Complete Calculation Example
Scenario: 4K LED Wall for Corporate Event
This 4K wall needs either a NovaStar MCTRL4K (16 ports available) or a Brompton SX40 (4 ports, would need additional XD unit for more outputs). Always add 20% headroom for last-minute show changes and wall expansions.
Panel Count per Port
It helps to know how many panels each port can drive for cabling planning:
Panels per Port = Port Pixel Capacity / Pixels per PanelExample: NovaStar port with 500x500mm panels at 2.6mm pitch (192x192 = 36,864 pixels per panel)
650,000 / 36,864 = 17.6 panels per port (use 17 max)
This means each output port can drive approximately one column of 17 panels.
4Brand Comparison: Brompton vs NovaStar vs Colorlight
The LED processor market is dominated by three brands, each with distinct strengths. Your choice depends on receiving card compatibility, application requirements, and budget.
Brompton Technology
Best for: Broadcast, virtual production, film, and applications requiring exceptional color accuracy
Strengths
- • 16-bit processing, industry-leading color
- • 10G fiber outputs (fewer cables for large walls)
- • Dynamic Calibration for per-pixel correction
- • Extensive genlock and sync options
- • Deep integration with high-end panels
Considerations
- • Premium pricing ($15,000-40,000+)
- • Requires Brompton receiving cards
- • Steeper learning curve
- • Fiber infrastructure required
Key products: Tessera SX40 (4 x 10G outputs, 8M pixels), Tessera XD (10G distribution), Tessera S8 (entry-level). Most broadcast trucks and virtual production stages run Brompton.
NovaStar
Best for: Touring, rental, corporate events, and productions requiring reliable, cost-effective processing
Strengths
- • Excellent reliability and industry track record
- • Wide range of price points ($3,000-12,000)
- • Large installed base, easy to find support
- • Both integrated and standalone options
- • Good color processing, adequate for most uses
Considerations
- • Gigabit Ethernet limits per-port capacity
- • Color not quite Brompton-level
- • Software can be complex
- • Requires NovaStar receiving cards
Key products: VX1000 (integrated processor, 6.5M pixels), VX4S (compact, 2.6M pixels), MCTRL4K (sending box, 8.3M pixels, 16 ports), MCTRL660 (entry-level, 1.3M pixels). Most rental companies standardize on NovaStar for its balance of capability and cost.
Colorlight
Best for: Budget-conscious installations, fixed installations, and price-sensitive rental markets
Strengths
- • Lowest cost option ($1,500-6,000)
- • Improving feature set
- • Good for permanent installations
- • Growing market presence
Considerations
- • Less common in rental fleets
- • Smaller support network
- • Fewer advanced features
- • Not ideal for broadcast
Key products: X20 (integrated processor), Z6 (sending box). Colorlight has gained market share in Asia and is increasingly seen in cost-sensitive Western installations.
Quick Comparison Table
| Specification | Brompton SX40 | NovaStar MCTRL4K | Colorlight X20 |
|---|---|---|---|
| Total Capacity | 8M pixels | 8.3M pixels | 6.5M pixels |
| Output Ports | 4 x 10G fiber | 16 x Gigabit | 16 x Gigabit |
| Pixels per Port | ~2M | ~650K | ~650K |
| Bit Depth | 16-bit | 10-14 bit | 10-12 bit |
| Genlock | Yes (extensive) | Yes | Limited |
| Price Range | $25,000-40,000 | $8,000-12,000 | $4,000-6,000 |
5Data Connectivity: Fiber vs Copper
The connection between processor and panels affects capacity, reliability, and installation complexity. Understanding when to use fiber versus copper prevents problems on site.
Copper (Cat6 Ethernet)
Gigabit Ethernet over Cat6 cable is the standard for most LED installations. It is familiar, field-terminable, and works for the majority of applications.
- Maximum reliable distance: 80-100 meters
- Bandwidth: 1 Gbps (limits pixel capacity per port)
- Termination: Standard RJ45, field-serviceable
- Cost: Low cable and equipment cost
- Best for: Indoor installations, runs under 80m, budget-sensitive projects
Fiber Optic
Fiber provides higher bandwidth and longer distances but requires more specialized equipment and handling.
- Maximum distance: 300m+ (multi-mode), 10km+ (single-mode)
- Bandwidth: 10 Gbps (Brompton) enables ~2M pixels per port
- Termination: Requires SFP transceivers, pre-made cables preferred
- Cost: Higher equipment cost, specialized infrastructure
- Best for: Large venues, outdoor installations, broadcast, ground loop isolation
Hybrid Configurations
Many installations use fiber from the processor to distribution points near the LED wall, then convert to copper for final panel connections. This combines fiber's distance and bandwidth with copper's simplicity.
Typical Hybrid Setup
When to Choose Fiber
Use fiber when: cable runs exceed 80 meters, electrical interference is present (outdoor festivals, venues with heavy motor loads), you need ground loop isolation between power sources, or you are using Brompton processors (10G fiber is the native output).
6Advanced Features
Beyond basic capacity, processor features affect image quality, integration, and reliability. Understanding these helps match processors to application requirements.
Genlock and Sync
Genlock synchronizes LED refresh to camera timing, eliminating scan lines in footage. Essential for broadcast and virtual production.
- Reference inputs: Blackburst, tri-level sync, SDI loop
- Frame rates: 23.976, 24, 25, 29.97, 30, 50, 60fps support
- Phase adjustment: Fine-tune timing alignment
- Free-run fallback: Continue operating if reference lost
Bit Depth and Color Processing
Higher bit depth prevents banding artifacts, especially in gradients and low-brightness content. The difference between 10-bit and 16-bit processing is visible on critical content.
- 10-bit: 1.07 billion colors, adequate for most applications
- 12-bit: 68.7 billion colors, better for HDR
- 14-16 bit: Smooth gradients, essential for broadcast
HDR Support
Modern content increasingly uses HDR for expanded dynamic range. Processor HDR support includes:
- HDR10: Static metadata, widely supported
- HLG: Broadcast-friendly, backward compatible
- Tone mapping: Convert HDR to display capability
Redundancy and Backup
Critical installations require redundancy to prevent blank screens:
- Hot backup: Secondary processor monitors primary, switches automatically on failure
- Cold backup: Spare unit available for manual switchover
- Dual data paths: Receiving cards with two inputs for cable redundancy
Control and Integration
Processors integrate with production systems for automated control:
- Network control: Ethernet-based remote configuration
- Preset recall: Store and recall configurations
- Show control: Integration with lighting/media systems
- API access: Custom automation and monitoring
7Common Mistakes to Avoid
Experience across thousands of LED installations reveals consistent patterns in processor-related problems. Learn from these to avoid costly on-site discoveries.
Mismatched receiving cards and processor
Consequence: System will not work at all—complete show failure
Always verify receiving card brand matches processor ecosystem before ordering
Calculating only total capacity, ignoring per-port limits
Consequence: Cannot drive full wall resolution despite adequate total capacity
Calculate both total pixels AND minimum ports required, add 20% headroom
Assuming any processor can drive any panel
Consequence: Arriving on site with incompatible equipment
Confirm receiving card type in panel specs, match to processor brand
No backup processor for critical shows
Consequence: Single point of failure can kill the entire show
Budget for hot or cold backup on broadcast and high-profile events
Using copper cables beyond distance limits
Consequence: Signal degradation, artifacts, intermittent failures
Use fiber for runs over 80 meters or switch to hybrid configuration
Forgetting genlock for camera shoots
Consequence: Visible scan lines in all footage, unusable video
Specify genlock-capable processor and verify sync reference before filming
8Decision Framework
Use this framework to select the right processor for your specific application. Start with your panel receiving card type, then match to application requirements.
Quick Selection Guide
| Application | Recommended Processor | Key Requirements |
|---|---|---|
| Broadcast / Virtual Production | Brompton Tessera SX40 | Genlock, 16-bit color, low latency |
| Concert Touring | NovaStar VX1000 or MCTRL4K | Reliability, port count, road-worthy |
| Corporate Events | NovaStar VX4S | Cost-effective, easy setup |
| Fixed Installation (Budget) | Colorlight X20 | Low cost, adequate features |
| Large Format (8K+) | Multiple MCTRL4K or Brompton + XD | High port count, may need multiple units |
The Decision Checklist
- 1What receiving cards are in your panels? This determines your processor ecosystem (Brompton, NovaStar, or Colorlight).
- 2What is your total pixel count? Calculate width × height to verify processor total capacity.
- 3How many ports do you need? Divide total pixels by per-port capacity, add 20% headroom.
- 4Will the wall be filmed? If yes, require genlock capability.
- 5What is your cable infrastructure? Choose fiber or copper based on distance and environment.
- 6Do you need redundancy? Budget for backup processor on critical shows.
Calculate Your Processor Requirements
Show Tech calculates exact port requirements for any LED wall configuration. Enter your panel specs and wall dimensions to get processor recommendations instantly.
9Frequently Asked Questions
How do I choose between Brompton, NovaStar, and Colorlight processors?
Choose Brompton for broadcast, virtual production, and applications requiring superior color accuracy (expect $15,000-40,000). Choose NovaStar for touring, rental, and general production where reliability and value matter ($3,000-12,000). Choose Colorlight for budget-conscious installations and fixed applications ($1,500-6,000). Most rental houses stock NovaStar; broadcast facilities prefer Brompton.
How many processor output ports do I need for my LED wall?
Calculate your total pixel count (width x height in pixels), then divide by the per-port pixel limit. NovaStar ports handle approximately 650,000 pixels each. Brompton 10G fiber ports handle about 2 million pixels each. For a 4K wall (8.3 million pixels), you need at least 13 NovaStar ports or 5 Brompton ports, plus 20% headroom.
What is the difference between a processor and a sending card?
The processor handles video input, scaling, color correction, and picture-in-picture. The sending card converts processed video into the data protocol that LED receiving cards understand. Modern processors like the NovaStar VX series and Brompton Tessera SX40 integrate both functions. Legacy systems use separate sending cards installed in computers.
Should I use fiber or copper data cables for LED walls?
Use copper (Cat6) for runs under 80 meters without significant electrical interference. Use fiber for runs over 80 meters, outdoor installations, venues with heavy electrical equipment, or when you need ground loop isolation. Brompton systems use 10G fiber by default; NovaStar supports both. Many setups use fiber from processor to distribution, then copper to panels.
What bit depth do I need in an LED processor?
For most applications, 10-bit input processing is sufficient (supports HDR10). Internal processing of 14-16 bits prevents banding during scaling and brightness adjustment. Brompton offers 16-bit processing; NovaStar ranges from 10-bit to 14-bit depending on model. Higher bit depth matters most for broadcast, HDR content, and walls running below 50% brightness.
Do I need genlock for my LED processor?
Yes, if you are filming the LED wall with cameras for broadcast or recording. Genlock synchronizes LED refresh to camera timing, eliminating scan lines in footage. Virtual production requires genlock. Live-only events without video capture do not strictly require genlock, though it can improve visual quality. Most professional processors include genlock input.
How do I match a processor to my LED panels?
Panels and processors must use the same receiving card ecosystem. Panels with Brompton receiving cards require Brompton processors. Panels with NovaStar receiving cards require NovaStar sending cards/processors. Some panels offer multiple receiving card options (ROE, for example, supports both). Always verify compatibility before specifying a processor.
What is processor redundancy and do I need it?
Processor redundancy means having a backup processor that takes over instantly if the primary fails. For broadcast and critical events, redundancy is essential. This can be hot-backup mode (backup monitors primary, switches automatically) or cold-backup (manual switch to spare unit). Rental companies typically budget for backup processors on high-profile shows.