| 摘要 |
PURPOSE:To display information of lots of control states with less number of display elements by displaying five levels through the adoption of the display method that three display elements are lighted by only one and two and changing the lightness. CONSTITUTION:A DC control voltage used for balance control is fed via a line 17A and this is fed to voltage comparator circuits 18, 19, 21 and an extinguishing circuit 20. Comparison reference voltages (a), (b), (c), (d) whose levels are shown in Fig. are set respectively to the comparison voltage circuits 18, 19 and 21 and the extinguishing circuit 20, and when a control voltage 17a fed via a line 17a is less than (b), only a display element 25 is lighted and when the control voltage is (b) or over and less than (a), the display elements 25 and 26 are both lighted. When the control voltage is (a) or over and less than (c), only the display element 26 is lighted and when the voltage is (c) or over and less than (d), the display elements 26, 27 are lighted, when the voltage is (d) or over, only the display element 27 is lighted. Thus, the five control voltage levels are displayed by the three display elements. |
