Source driver and power down detector thereof
AssigneeHimax Technologies Limited
InventorsChuan-Che Lee, Tsung-Yu Wu, Yu-Jui Chang, Kuan-Sheng Huang
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Abstract
The present invention discloses a source driver powered by a power supply comprising at least one channel, at least one output pad coupled to the channel, at least one switch connected between the output pad and a predetermined voltage, and a power down detector for detecting whether a first supply voltage from the power supply is insufficient and generating a reset signal to turn on the switch if yes.
Claims14
A source driver powered by a power supply, comprising:
- at least one channel;
- at least one output pad coupled to the channel;
- at least one switch connected between the output pad and a predetermined voltage;
- and
- a power down detector for detecting whether a first supply voltage from the power supply is insufficient and generating a reset signal to turn on the switch if yes.
A power down detector used in a source driver for detecting whether a first supply voltage from a power supply is insufficient, output pads of the source driver connecting to a predetermined voltage via a switch, the power down detector comprising:
- a first voltage divider for generating a first divided voltage based on the first supply voltage;
- and
- a first comparator for comparing the first divided voltage with the threshold voltage, and if yes, outputting a reset signal for turning on the switch.
Dependencies are inferred from the claim text.