COB (Chip on Board) technology is becoming increasingly popular in the LED video wall Industry for a number of reasons. Here's how it is used:

1. Enhanced Picture Quality: COB technology allows for a much smaller pixel pitch compared to conventional SMD (Surface Mount Device) technology. This means the LEDs are closer together, which results in a higher resolution and improved picture quality, especially at closer viewing distances.

2. Durability: In COB, the LED chips are directly mounted on the PCB (Printed Circuit Board), forming a single module. This method provides better thermal conductivity, reducing heat generation and leading to improved lifespan and stability of the LEDs.

3. High Brightness and Contrast: The density of LED chips in COB technology is higher than other LED technologies, which provides greater brightness and contrast. This makes COB LED video walls ideal for environments with high ambient light.

4. Viewing Angle: COB technology offers superior viewing angles. This means that the image quality remains consistent even when viewed from extreme angles.

5. Lower Power Consumption: Due to efficient thermal management, COB LEDs consume less power than their SMD counterparts for the same brightness, leading to energy savings.

6. Reduced Light Loss: The chip-on-board approach reduces light loss because there is no need for additional encapsulation.

While COB technology provides a range of advantages, it also comes with some challenges, such as higher initial cost and more complex repair processes. These are trade-offs that need to be considered when choosing a display technology.

External Links: 

• https://en.wikipedia.org/wiki/Chip_on_board