Dell New Inspiron 14 5490 Laptop. ... Acer Swift 5 Premium. What is the thinnest TV? Already, the world's thinnest TVs are ridiculously streamlined, with the thinnest option —the LG Wallpaper OLED TV— just 0.15-inches thick. In comparison, Sony's A8H OLED TV is 2.125-inches thick, ...