The present invention generally relates to a screen 1 of the type including a visor 2 whit variable transparency as a function of the extent of the electrical values measurable at its power supply clips 3. The visor 2 is power supplied by a respective electric source with the possible interposition of appropriate devices 4 for the control and management of the electrical values of the power supplied. The liquid crystal visor 2 is flexible to be adapted to the surfaces of installation and the electrical power source includes at least a photovoltaic cell 5.
