The optimal viewing distance for a 40-inch LED TV depends on various factors such as personal preference, the type of content being watched, and the TV's resolution.
However, as a general guideline, a 40-inch LED TV is best viewed from a distance of 5 to 8 feet (1.5 to 2.4 meters). This distance provides a good balance between immersion and visual clarity, allowing you to enjoy the content without having to strain your eyes.
If you're sitting closer than 5 feet, you may find the picture quality to be too sharp, making it difficult to see the entire screen without moving your head. On the other hand, if you're sitting farther than 8 feet, you may not be able to fully appreciate the details and nuances of the picture.
Of course, everyone's eyes are different, and some people may prefer to sit closer or farther away from their 40-inch TV. Ultimately, the best viewing distance is the one that feels most comfortable and enjoyable for you.