To determine the appropriate size outdoor LED screen for a 70-meter distance, the following factors need to be considered:
1. Relationship between viewing distance and pixel pitch. The optimal viewing distance formula is: Pixel pitch (mm) × 1000 ≈ Minimum clear viewing distance (mm). For example:
If a P10 (10mm pitch) screen is used, the minimum clear viewing distance is 10 meters. Details will appear blurry at 70 meters, making it suitable for displaying simple content (such as text or slogans).
If a P20 (20mm pitch) screen is used, the minimum viewing distance is 20 meters. Viewing at 70 meters is more comfortable, making it suitable for dynamic images or videos.
Recommended pitch: For a 70-meter distance, a P16~P25 LED screen is recommended to balance clarity and cost.
2. Screen Size Calculation
Height Requirements: Based on the viewing angle (recommended ≤30°), the relationship between the vertical height (H) from the bottom of the screen to the viewer's eyes and the viewing distance (D) is:
[\tan(30°) = \frac{H}{70} \Rightarrow H \approx 40.4 meters
The actual screen height is usually 1/3 1/2 of the total height, therefore, a screen height of **815 meters** is recommended.
Width Aspect Ratio: The standard aspect ratio is 16:9 or 4:3. For example:
If the height is 10 meters, the width at a 16:9 aspect ratio is 17.8 meters, and the total area is 178 square meters.
If the height is 12 meters, the width at a 4:3 aspect ratio is 16 meters, and the total area is 192 square meters.
3. Ambient Brightness and Protection
Outdoor screens must have a brightness of **≥5000 nits (sunny day)** and IP65 protection rating** (dustproof and waterproof).
The installation location should avoid direct sunlight or shaded areas.
4. Content Type Impact
Text/Data: Size can be reduced (e.g., 8m high x 12m wide).
Video/Advertisements: Larger size (e.g., 12m high x 20m wide) is recommended for enhanced visual impact.
5. Budget and Maintenance
Larger pixel pitch (e.g., P25) is cheaper, but requires a trade-off in clarity; smaller pixel pitch (e.g., P10) is suitable for close-range viewing, but its cost-effectiveness is low beyond 70 meters.
Conclusion
Recommended Solution:
Pixel Pitch: P20
Screen Size: 12m (height) x 21m (width) (16:9 aspect ratio)
Total Area: 252㎡
Resolution: 600 (height) x 1050 (width) pixels
This configuration can clearly display dynamic content at 70 meters, balancing viewing effect and cost. On-site testing of viewing distance and angle is required before actual installation.
