Source driver
AssigneeHimax Technologies Limited
InventorMeng-Tse Weng
Life of this patent
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Abstract
A source driver, which has a first resistor string, a first digital-to-analog converter, and a channel buffer, is provided. The first resistor string has a plurality of resistors connected in series, wherein each of the resistors of the first resistor string provides a corresponding gamma voltage. The first digital-to-analog converter is coupled to the resistors of the first resistor string. The digital-to-analog converter selectively outputs one of gamma voltages provided by the resistors as a first output voltage according to a data code. The channel buffer is coupled to an output terminal of the first digital-to-analog converter to output a second output voltage by shifting a voltage level of the first output voltage.
Claims14
A source driver, comprising:
- a first resistor string, comprising a plurality of resistors connected in series, each of the resistors of the first resistor string providing a corresponding gamma voltage;
- a first digital-to-analog converter, coupled to the resistors of the first resistor string, wherein the first digital-to-analog converter outputs one of gamma voltages provided by the resistors as a first output voltage according to a data code;
- a channel buffer, coupled to an output terminal of the first digital-to-analog converter, shifting a voltage level of the first output voltage by an offset voltage so as to output a second output voltage;
- and
- a second digital-to-analog converter for outputting the offset voltage according to a control code.
A source driver, comprising:
- a current digital-to-analog converter, outputting an offset current according to a control code;
- a first resistor string, comprising a plurality of resistors connected in series, each of the resistors of the first resistor string providing a corresponding gamma voltage;
- a first digital-to-analog converter, coupled to the resistors of the first resistor string, wherein the first digital-to-analog converter outputs one of gamma voltages provided by the resistors as a first output voltage according to a data code;
- and
- a channel buffer, coupled to an output terminal of the first digital-to-analog converter, shifting a voltage level of the first output voltage by an offset voltage so as to output a second output voltage, the channel buffer comprising:
- an operational amplifier, outputting the second output voltage, wherein a positive input terminal of the operational amplifier is coupled to the output terminal of the first digital-to-analog converter;
- and
- a resistor, wherein one of two ends of the resistor is coupled to a negative input terminal of the operational amplifier and receives the offset current, and the other one of the two ends of the resistor is coupled to an output terminal of the operational amplifier and outputs the second output voltage.
Dependencies are inferred from the claim text.