| 摘要 |
PURPOSE:To keep current required for display constant even if an input is changed by actuating only one LED in accordance with the input in a bar graph display device using ED and the like. CONSTITUTION:Impulse voltage applied to an input terminal 1 is differentiated and divided by a circuit 3 and supplied to respective voltage comparators 21- 24. Respective outputs of storage circuits 11-14 are connected to respective nodes 41-44 of LED groups 61-64 connected each other in series. Said constitution enables one LED located on a position corresponding to the size of the input to be actuated and emit light. Thus the current required for display can be kept constant even if the input is changed. |
