Some common reasons for having a TV screen in an establishment include:

1. Advertising: Restaurants may use TV screens to display their menu items, daily specials, or upcoming events. This can be a useful way to promote new menu items or specials and keep customers informed about what's happening at the restaurant.
2. Ambience: Some restaurants may use TV screens to create a certain ambiance or atmosphere. For example, a sports bar may have multiple screens showing different games to create a lively and energetic atmosphere.
3. Educational purposes: Some restaurants, especially those that serve specialty cuisines or unique foods, may use TV screens to educate customers about the food they are serving. They may show videos or images that explain the ingredients, cooking techniques, or cultural significance of the dishes.