| 摘要 |
User input device, such as an electronic menu, comprising a back cover, a stack of pages, each page having selectable printed items thereon, each page being removable from said stack, for instance by being hingedly attached to said back cover at one side such that a user can select each one of said pages to be on top, said device comprising an electrically powered page detection mechanism arranged to determine which one of said pages is on top, said back cover comprising an electrically powered touch detection mechanism arranged to determine the presence and location of a tip of a user's finger or stylus on or near the surface of the page on top, wherein said user input device comprises a power management device electronically coupled to said detection mechanisms and arranged to keep said page detection mechanism in a sleep modus wherein no or relatively little power is used until said touch detection mechanism determines the presence of the tip of a user's finger or stylus, and to power up said page detection mechanism temporarily for a period of time if said touch detection mechanism determines the presence of the tip of a user's finger or stylus, said period of time being long enough to enable said page detection mechanism to determine which one of said pages is on top, and to put said page detection mechanism in said sleep modus once said determination has been completed. |
