| 摘要 |
A device for displaying indicia, comprising: a display (57) comprising a plurality of activatable elements, wherein each element has an activated state in which the element is visible and a deactivated state in which the element is not visible and one or more of the elements are activatable to display indicia; and control means (910) for controlling the display (57) which includes test means (960) which is configured to activate successively groups of elements according to a predetermined control sequence such that the activated and deactivated state of each of the elements is tested, wherein the control means (910) is configured to activate the elements in groups of one or two and the successive activation of elements comprises, for each group, the steps of activating all of the elements in the group, activating one element in the group, not activating one element in the group and not activating all of the elements in the group. |
