Movable large display device

Claim 1

A large movable display device comprising a hollow display device body, a light emitting section provided on an external surface of said display device body for displaying characters and images, air conditioning means provided inside said display device body for blowing cooling air over the rear surface of said light emitting section for cooling said light emitting section, external air inlet means and external air outlet means located in an external surface of said body adjacent said air conditioning means, cover means provided for said external air inlet means and said external air outlet means for selectively opening and closing said inlet and outlet means to control the flow of external air for cooling said air conditioning means, removable separator panel means disposed in said display device body in spaced relation to said rear surface of said light emitting means to define a cooling passage between said panel means and said light emitting display section and duct means extending from said air conditioning means and having cooling air outlet disposed at the top of said cooling air passage above said separator panel means whereby said cooling air is directed through said duct means and then downwardly through said cooling air passage.