Here are some key points about this type of screen:

1. **Size and Resolution**: The 49-inch screen size offers a good amount of visible area for advertisements and other content. The 2K resolution displayd sharp and detailed images.

2. **Thin Design**: The 3.3mm thickness makes this screen very lightweight and easy to mount on walls or other surfaces. It also has a modern, minimalist aesthetic that can blend in with various interior design styles.

3. **OLED Technology**: OLED (Liquid Crystal Display) technology is widely used in screens for televisions, monitors, and advertising displays. It offers good color reproduction, contrast, and viewing angles, making it suitable for displaying advertisements and videos.

4. **Advertising Applications**: This type of screen is often used for digital signage and advertising purposes in retail stores, restaurants, airports, and other busy public areas. The content displayed on the screen can be easily changed using software, making it a flexible and versatile advertising tool.

5. **Connectivity**: The screen will likely have a variety of input options such as HDMI,RS232, and USB etc., allowing it to be connected to different types of media players, computers, and other devices. Some models may also have wireless connectivity options such as Wi-Fi or Bluetooth.

6. **Durability**: Screens used for advertising purposes need to be durable and able to handle continuous use. 

P.S.: https://www.szefluence.com/lcd-digital-signage/49-inch-paper-thick-33mm-lcd-advertising-screen.html