In recent years, portable information devices including touch-panel liquid crystal displays and no physical keyboards, such as tablet PCs and smartphones, have been rapidly widespread. Displays of portable information devices of this type are preferably large in use, but are preferably small size when being carried. In view of this, in a proposed portable information device, a display as well as a chassis is made foldable by using a flexible display such as an organic electro luminescence (EL) display (see, for example, Patent Document 1).
[Patent Document 1] Japanese Patent Application Laid-Open No. 2014-216025