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US 12,191,829 B2Granted
Differential amplifier and a data driving device
AssigneeLx Semicon Co., Ltd.
InventorsSang Duk Yu, Ho Jong Park, Tae Jun Ahn, Sung Dae Yeo
Life of this patent
Estimating the term…
Abstract
A differential amplifier according to an embodiment can be provided in a data driving device for driving pixels of a display panel. The differential amplifier can improve the slew rate of the differential amplifier by supplying dynamic current to an input circuit stage and/or a current mirror circuit stage of the differential amplifier through a boosting circuit stage.
Claims18
A differential amplifier comprising:
- an output circuit stage comprising a first output transistor disposed between a first voltage rail and an output side, and a second output transistor disposed between a second voltage rail and the output side;
- an input circuit stage configured to generate differential currents according to differential input voltages;
- a current mirror circuit stage configured to control gate terminals of the first output transistor and the second output transistor according to the differential currents;
- and
- a boosting circuit stage configured to additionally supply dynamic current to the input circuit stage in response to changes in the differential input voltages,
- wherein the boosting circuit stage comprises a comparison transistor in which a line of a first differential input voltage is connected to a gate terminal and a line of a second differential input voltage is connected to a source terminal, and
- wherein the dynamic current is configured to be supplied according to current flowing in the comparison transistor.
4 more elements
A differential amplifier comprising:
- an output circuit stage comprising a first output transistor disposed between a first voltage rail and an output side, and a second output transistor disposed between a second voltage rail and the output side;
- an input circuit stage configured to generate differential currents according to differential input voltages;
- a current mirror circuit stage configured to control gate terminals of the first output transistor and the second output transistor according to the differential currents;
- and
- a boosting circuit stage configured to additionally supply dynamic current to the current mirror circuit stage in response to changes in the differential input voltages,
- wherein the boosting circuit stage comprises a comparison transistor in which a line of a first differential input voltage is connected to a gate terminal and a line of a second differential input voltage is connected to a source terminal, and
- wherein the dynamic current is configured to be supplied according to current flowing in the comparison transistor.
4 more elements
A data driving device comprising:
- a latch circuit configured to latch pixel data comprising grayscale values for pixels;
- a digital-to-analog converter configured to convert a digital signal corresponding to the pixel data into an analog voltage;
- and
- a buffer circuit comprising a rail-to-rail class-AB type amplifier, and configured to supply to a pixel a data voltage obtained by amplifying the analog voltage using the amplifier, and additionally supply dynamic current to an input circuit stage or a current mirror circuit stage of the amplifier in response to changes in the analog voltage,
- wherein the boosting circuit stage comprises a comparison transistor in which a line of a first differential input voltage is connected to a gate terminal and a line of a second differential input voltage is connected to a source terminal, and
- wherein the dynamic current is configured to be supplied according to current flowing in the comparison transistor.
3 more elements
Dependencies are inferred from the claim text.