LG LED – Basic knowledge about LED Signage

What does LED mean?

1. LED means Light Emitting Diode
2. LED is a two-lead semiconductor light source

What are common types of LED?

1. Oval type RGB lamp
2. SMD(Surface Mounted Device)
3. COB (Chip on Board)
3. 4-in-1 LED Package

• Oval type is common for Outdoor screens(High brightness/durability)
• SMD type is becoming more widespread due to better color representation & wider vertical viewing angle

COB (Chip on Board)

In contrast with regular SMD LED where the LED chips are packaged together and then mounted on the PCB (Printed circuit Board), with COB technology the LED chips are embedded directly on the PCB , COB is the main technology behind LG Micro LED, providing the following benefits:

• Perfect Black: Increases the black area to total area ratio with smaller light source (Chip) sizes
• Wide Viewing Angle: Maintain brightness and color uniformity from any angle through micro LED optimization and elimination of gaps between chips with silicone coating process
• Screen Protection: Protect the screen surface by applying coating and film layers on top of the Micro LED chip
• Clear Surface: Smooth screen surface by applying coating and film layers on top of the Micro LED Chip
• Anti-Coating: Anti-Glare, Anti-Fingerprint, Anti-Reflection

4in1 LED Package

• By adopting 4-in-1 LED package where 4 pixels are combined and integrated into one single LED package, this means it is more durable than conventional LED displays even to human touch.

• The LED signage industry uses pixel pitch as a standard measurement to indicate the resolution of LED display based on the spacing of LED pixels
• The Pixel pitch of LED display is derived by measuring the distance between each pixel
• Increasing the pitch is going to spread out the pixels and give you a lower resolution
• A smaller pitch is going to compress the pixel spacing and result in a higher resolution

How to calculate the appropriate pixel pitch

Pixel pitch = viewing distance x 0.357

Wide Viewing Angle

If a screen is installed at a certain height, the viewers must face upwards to view the LED screen. In this case, wide vertical viewing angle is required.

Vertical Viewing Angle

SMD LED provides a greater vertical viewing angle

• During the game broadcasting live cameras sometimes shoot at the LED screen.
• If the LED screen’s refresh rate is low, the LED screen seen from  TV may show lines.
• To avoid lines, the LED screen refresh rate should be 2,000Hz↑

Most LG LED screens will have refresh rates higher than 3000 Hz

Front SVC

Rear SVC