Portable visual display device with a collapsible presentation screen

A collapsible rear projection screen assembly for a portable visual display device comprising a screen assembly that collapses into a closed condition suitable for easy transport by a simple folding movement between two or more screen sections and reduces or eliminates the risk of optical or physical damage to the screen member during collapsing and achieves these by comprising a flexible viewing screen member that is held to be flat by its permanent attachment to the four sides of a surrounding rectangular frame member that is composed of rigid frame elements connected by jointing means and where the jointing means feature axes of rotation that can be considered to be virtual or pseudo-virtual or that may move out of the physical section of the frame elements and thereby permitting rotation in a folding manner of up to 180 degrees between sections of the screen assembly and whereby the viewing screen member and/or its attachment means may extend outwards to at least partially overlap the frame jointing means and also whereby the elements of the jointing means by their shape or by their operation will provide a hollow into which the screen member can pass during the rotation of the jointing element to the closed position and thus avoiding potential damage to the material of the screen member by crushing or other contact.