| 摘要 |
A power-down circuit for an image display panel has a switch connected between a ground power line and a display power line, which carries a display voltage higher than the main power supply voltage of the device. When the main power supply voltage falls below a certain level, the control terminal of the switch is connected to the display power line through a voltage dropping element, thereby turning the switch on to discharge the display voltage to ground. The voltage dropping element, which may be a parasitic diode, ensures that the switch remains on until the display voltage has reached or nearly reached the ground level.
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