The first-line brands of LED screens are:

1. Huina Technology: Headquartered in Shenzhen, China, it is one of the world's leading suppliers of LED display solutions, providing various indoor and outdoor LED display products.

2. Samsung: A multinational electronics company from South Korea, it provides a variety of LED display products, covering TVs, monitors and LED video walls.

3. LG: A multinational electronics company also from South Korea, providing LED TVs, large-screen monitors and other products. It has launched various innovative LED display technologies.

4. Sony: A Japanese multinational electronics company that provides high-quality LED TV and display products and is famous for its image processing technology and image quality performance.

5. Crown: A Chinese LED display manufacturer with a high global market share. Focus on indoor and outdoor LED display solutions, covering products of different sizes and uses. LED screen is a display technology that uses light-emitting diodes (LEDs) as light sources, combined with control circuits and pixel matrix arrangements, to convert electrical signals into visible light signals to display images, text, videos and other content.