(EP811218-A1)      Display device has battery cells and solar cells, with its available surface divided into symbol segments and background elements, at least part of the surface of the background elements being used for solar cells. The function and design of battery cells and display elements are identical and use a first electrolyte, an inactive coloured display element operating as a battery together with background elements of the symbols, using the first electrolyte.    A portion of a background element using the first or a second electrolyte serves as a solar cell from which energy is stored in the batteries. Upon switch-over of a display element from an inactive coloured to an active transparent state, the stored energy is distributed to other inactive elements serving as batteries.    USE -   As a symbol display for e.g. electronic shelf-edge price marking labels.    ADVANTAGE -   Surface demanding functions such as display elements, solar cells and batteries are integrated within the same surface, maximising the surface available for symbol presentation.    (EP811218-B1)      Display device has battery cells and solar cells, with its available surface divided into symbol segments and background elements, at least part of the surface of the background elements being used for solar cells. The function and design of battery cells and display elements are identical and use a first electrolyte, an inactive coloured display element operating as a battery together with background elements of the symbols, using the first electrolyte.    A portion of a background element using the first or a second electrolyte serves as a solar cell from which energy is stored in the batteries. Upon switch-over of a display element from an inactive coloured to an active transparent state, the stored energy is distributed to other inactive elements serving as batteries.    USE -   As a symbol display for e.g. electronic shelf-edge price marking labels.    ADVANTAGE -   Surface demanding functions such as display elements, solar cells and batteries are integrated within the same surface, maximising the surface available for symbol presentation.    (US6104372-A)      Display device has battery cells and solar cells, with its available surface divided into symbol segments and background elements, at least part of the surface of the background elements being used for solar cells. The function and design of battery cells and display elements are identical and use a first electrolyte, an inactive coloured display element operating as a battery together with background elements of the symbols, using the first electrolyte.    A portion of a background element using the first or a second electrolyte serves as a solar cell from which energy is stored in the batteries. Upon switch-over of a display element from an inactive coloured to an active transparent state, the stored energy is distributed to other inactive elements serving as batteries.    USE -   As a symbol display for e.g. electronic shelf-edge price marking labels.    ADVANTAGE -   Surface demanding functions such as display elements, solar cells and batteries are integrated within the same surface, maximising the surface available for symbol presentation.