| 摘要 |
<p>Conventionally, each LED array has a variable-voltage power source. When a liquid crystal display device has an increased display size, it has been necessary to increase the number of variable-voltage power sources together with the LED arrays. A variable-voltage power source (11) generates an output voltage which is changed with a predetermined cycle within a predetermined voltage range. When an output voltage of the variable-voltage power source (11) is applied to each of LED arrays (101, 102, 103), a storage unit (31) stores an output voltage of the variable-voltage power source (11) when the current flowing into the respective LED arrays has a preset current value as respective LED array applied-voltage values (Va1, Va2, Va3). When the output voltage of the variable-voltage power source (11) coincides with one of the applied-voltage values (Va1, Va2, Va3) of the LED arrays (101, 102, 103) stored in the storage unit (31), a control unit (21) applies the output voltage of the variable-voltage power source (11) to that LED array.</p> |
