Cooling fans.

Why Vidi-Touch use low noise cooling fan in case of 4K LCD Panel

Cooling Fans for 4K have a function to remove moisturizing or condensation problem between a tempered glass and LCD Panel. (Air circulation by cooling fans not only reduces the temperature but remove moisture and condensation problem) If a protective film or foil to avoid moisture is attached on the panel, it can impact on visibility of the Panel badly at first.