LED display operating temperature

In an LED display system, the cabinet (also called a cabinet unit) is the standardized structural unit positioned between the LED module and the complete screen. Calculating cabinet quantity is one of the most important steps in project quotation, structural design, and installation planning.

Core Calculation Formula Basic Formula Horizontal Cabinet Quantity

N w = ⌈

Screen Width Cabinet Width

⌉ N_w = \left\lceil \frac{\text{Screen Width}}{\text{Cabinet Width}} \right\rceil

Vertical Cabinet Quantity

N h = ⌈

Screen Height Cabinet Height

⌉ N_h = \left\lceil \frac{\text{Screen Height}}{\text{Cabinet Height}} \right\rceil

Total Cabinet Quantity

N t o t a l = N w × N h

N_{total} = N_w \times N_h

Ntotal​=Nw​×Nh​

Note:

• The symbol
• ⌈
• x
• ⌉
• \lceil x \rceil

⌈x⌉ means rounding up because cabinets cannot be divided into partial units.

Common LED Cabinet Sizes Cabinet Type Typical Size Common Pixel Pitch Typical Applications

Die-cast aluminum cabinet 500 × 500 mm / 500 × 1000 mm

P2.6 / P2.9 / P3.9

Rental displays, stage screens Die-cast aluminum cabinet 640 × 480 mm P1.5 / P1.8 / P2 / P2.5 Fine-pitch fixed installations Steel cabinet 960 × 960 mm P4 / P5 / P6 / P8 / P10

Outdoor fixed LED billboards

Steel cabinet 768 × 768 mm

P3 / P4 / P5

Outdoor and semi-outdoor displays Lightweight/simple cabinet 480 × 480 mm / 512 × 512 mm

P2.5 / P3 / P4

Creative and irregular LED displays

Complete Calculation Example Project Scenario

Build a 6 m × 4 m outdoor P5 advertising LED screen.

Known Parameters Target Screen Size

Width: 6000 mm Height: 4000 mm

Selected Cabinet

Cabinet size: 960 × 960 mm Standard steel cabinet

LED Module

Module size: 320 × 160 mm

Each cabinet contains:

• 3 modules horizontally
• 6 modules vertically

So each cabinet contains:

• 3
• ×
• 6
• =
• 18
• modules
• 3 \times 6 = 18 \text{ modules}

Step 1: Calculate Horizontal Cabinet Quantity

⌈ 6000 960 ⌉ = ⌈ 6.25 ⌉ = 7 \left\lceil \frac{6000}{960} \right\rceil = \left\lceil 6.25 \right\rceil = 7

Therefore:

• 7
• cabinets horizontally
• 7 \text{ cabinets horizontally}

Step 2: Calculate Vertical Cabinet Quantity

⌈ 4000 960 ⌉ = ⌈ 4.17 ⌉ = 5 \left\lceil \frac{4000}{960} \right\rceil = \left\lceil 4.17 \right\rceil = 5

Therefore:

• 5
• cabinets vertically
• 5 \text{ cabinets vertically}

Step 3: Calculate Total Cabinet Quantity

7 × 5 = 35 7 \times 5 = 35

So the project requires:

• 35
• cabinets
• 35 \text{ cabinets}

Step 4: Calculate Actual Screen Size Actual Width

7 × 960 = 6720 mm 7 \times 960 = 6720 \text{ mm}

Actual Height

5 × 960 = 4800 mm 5 \times 960 = 4800 \text{ mm}

So the final installed screen size becomes:

• Width: 6720 mm
• Height: 4800 mm

Step 5: Calculate the Size Difference Width Difference

6720 − 6000 = 720 mm 6720 – 6000 = 720 \text{ mm}

Height Difference

4800 − 4000 = 800 mm 4800 – 4000 = 800 \text{ mm} The final screen is therefore larger than the original target dimensions.

Calculating Module Quantity from Cabinet Quantity

Each cabinet contains a fixed number of LED modules.

Cabinet Size Module Size Horizontal Modules Vertical Modules Total Modules per Cabinet

960 × 960 mm 320 × 160 mm 3 6 18 640 × 480 mm 320 × 160 mm 2 3 6 500 × 500 mm 250 × 250 mm 2 2 4 500 × 1000 mm 250 × 250 mm 2 4 8

Using the previous example:

• 35
• cabinets
• ×
• 18
• modules
• =
• 630
• modules
• 35 \text{ cabinets} \times 18 \text{ modules} = 630 \text{ modules}

Therefore, the complete LED display requires:

• 630
• LED modules
• 630 \text{ LED modules}

Three Common Engineering Solutions

Strategy 1: Round Up by Standard Cabinet Size (Most Common)

This is the most widely used method.

The cabinet quantity is rounded up directly, making the final screen slightly larger than the design size. The excess area is usually covered with aluminum composite panels or stainless-steel decorative framing.

Advantages Standardized structure Easier maintenance Faster installation Lower cost

Strategy 2: Change Cabinet Size

If the dimensional deviation is too large, you can switch to another cabinet size.

Example: Using 768 × 768 mm Cabinets

Horizontal Quantity

⌈ 6000 768 ⌉ = 8 \left\lceil \frac{6000}{768} \right\rceil = 8

Actual width:

• 8
• ×
• 768
• =
• 6144
• mm
• 8 \times 768 = 6144 \text{ mm}

Vertical Quantity

⌈ 4000 768 ⌉ = 6 \left\lceil \frac{4000}{768} \right\rceil = 6

Actual height:

• 6
• ×
• 768
• =
• 4608
• mm
• 6 \times 768 = 4608 \text{ mm}

Total Cabinets

8 × 6 = 48 8 \times 6 = 48 This solution fits the target dimensions more closely, but it increases the total cabinet quantity.

Strategy 3: Custom Non-Standard Cabinets

Another option is to customize edge cabinets.

For example:

• 6000
• −
• 6
• ×
• 960
• =
• 240
• mm
• 6000 – 6 \times 960 = 240 \text{ mm}

The last cabinet column can be customized to 240 mm width.

Advantages Precise final dimensions Cleaner architectural integration Disadvantages Higher manufacturing cost Non-standard spare parts More difficult maintenance

Quick Reference Table (960 × 960 mm Cabinets) Target Width Horizontal Cabinets Actual Width Target Height Vertical Cabinets Actual Height Total Cabinets

3 m 4 3840 mm 2 m 3 2880 mm 12 4 m 5 4800 mm 3 m 4 3840 mm 20 5 m 6 5760 mm 3 m 4 3840 mm 24 6 m 7 6720 mm 4 m 5 4800 mm 35 8 m 9 8640 mm 5 m 6 5760 mm 54 10 m 11 10560 mm 6 m 7 6720 mm 77

Important Engineering Considerations Maintenance Access

For outdoor front-service LED displays, verify whether the cabinet thickness allows enough maintenance space for front access.

Weight Calculation Total Weight Single Cabinet Weight Cabinet Quantity

\text{Total Weight} = \text{Single Cabinet Weight} \times \text{Cabinet Quantity}

Typical cabinet weights:

• Aluminum cabinet: approximately 12–18 kg
• Steel cabinet: approximately 25–35 kg

Power Distribution

Each cabinet typically consumes:

• 200
• W
• ∼
• 400
• W
• 200\text{ W} \sim 400\text{ W}

Total power consumption determines:

• Circuit breaker specifications
• Power cable size
• Distribution cabinet requirements

Receiving Card Loading Capacity

A single receiving card usually supports:

• 2
• ∼
• 4
• cabinets
• 2 \sim 4 \text{ cabinets}

Therefore, the cabinet quantity directly affects the control system configuration.

Cabinet Gaps

There is typically a:

• 1
• ∼
• 2
• mm
• 1 \sim 2 \text{ mm}

gap between adjacent cabinets. Engineers should reserve tolerance for these seams when calculating the final screen dimensions.