Back to results
US 2024/0128930 A1Published application
Data driving circuit and display including the same
AssigneeLx Semicon Co., Ltd.
InventorsYong Sung AHN, Ji Won KIM, Hyo Joong KIM, Kyung Min SHIN, Kyu Tae LEE, Ha Rim CHOI
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to an offset elimination operation of an internal operational amplifier of a data driving circuit and relates to a technique that applies different offset elimination methods for each position of an operational amplifier.
Claims20
A gamma voltage generation circuit comprising:
- a first operational amplifier circuit connected to an uppermost end of a resistor string and outputting a first voltage;
- a second operational amplifier circuit connected to a lowest end of the resistor string and outputting a second voltage;
- and
- a third operational amplifier circuit connected to a node between the resistor strings and dividing and outputting the first voltage and the second voltage,
- wherein the third operational amplifier circuit includes a first offset elimination circuit that eliminates an offset voltage through charging and discharging of a capacitor, and
- the first operational amplifier circuit and the second operational amplifier circuit eliminate an offset voltage in a manner different from that of the third operational amplifier circuit.
3 more elements
A data driving circuit comprising:
- a data voltage generation circuit that supplies a data voltage to a pixel through a data line;
- and
- a gamma reference voltage generation circuit that distributes a power supply voltage formed at both ends of a resistor string to generate a gamma reference voltage and supplies the gamma reference voltage to the pixel through the data line,
- wherein the gamma reference voltage generation circuit includes:
- a first operational amplifier circuit connected to a first end of the resistor string;
- a second operational amplifier circuit connected to a second end of the resistor string;
- and
- a third operational amplifier circuit connected to a node of the resistor string,
- wherein the first operational amplifier circuit and the second operational amplifier circuit eliminate an offset voltage of an internal operational amplifier in a manner different from that of the third operational amplifier circuit, and
- the first operational amplifier circuit and the second operational amplifier circuit eliminate the offset voltage by operation of a pair of switches that alternately change connection of input and output terminals.
7 more elements
A method of eliminating an offset comprising:
- eliminating an offset voltage of a first operational amplifier circuit connected to one end of a resistor string and outputting a first gamma reference voltage;
- eliminating an offset voltage of a second operational amplifier circuit connected to the other end of the resistor string and outputting a second gamma reference voltage;
- and
- eliminating an offset voltage of a third operational amplifier circuit connected to a node of the resistor string and outputting a third gamma reference voltage,
- wherein the third operational amplifier circuit includes a first offset elimination circuit connected in parallel, and
- the first or second operational amplifier circuit includes a third offset elimination circuit that independently performs an offset elimination operation different from that of the first offset elimination circuit.
3 more elements
Dependencies are inferred from the claim text.