US 11,081,036 B1 · Slew rate enhancement circuit

Abstract

The disclosure provides a slew rate enhancement apparatus that is connected to an operational amplifier that receives an input signal and generates an output signal according to the input signal for driving a pixel. The slew rate enhancement apparatus comprises a signal edge detector, a comparator, an adjustment unit. The signal edge detector is coupled to the operational amplifier and configured to detect a signal edge and outputting a difference signal corresponding to a difference between the input and output signals. The comparator is coupled to the signal edge detector to receive the difference signal and configured to generate a control signal according to the difference signal. The adjustment unit is coupled to the comparator to receive the control signal, and configured to couple a compensation signal generated by a current source to the operational amplifier according to the control signal to enhance a slew rate of the operation amplifier.

Claims18

Dependent claims

A slew rate enhancement apparatus, connected to an operational amplifier that receives an input signal and generates an output signal according to the input signal for driving a pixel, comprising:

a signal edge detector, coupled to the operational amplifier, detecting a signal edge and outputting a difference signal corresponding to a difference between the input and output signals;
a comparator, coupled to the signal edge detector to receive the difference signal and generating a control signal according to the difference signal;
and an adjustment unit, coupled to the comparator to receive the control signal, and configured to couple a compensation signal generated by a current source to the operational amplifier according to the control signal to enhance a slew rate of the operation amplifier, wherein the adjustment unit comprises:
a sourcing portion, providing a first compensation current through the current source based on the control signal;
and a sinking portion, draining a second compensation current through the current source based on the control signal.

2 more elements

A display panel, comprising:

a controller, receiving display data to display an image;
a display panel, including a plurality of source lines, a plurality of gate line, and a plurality of pixels at an intersection of the source lines and the gate lines;
25 a gate driving circuit, coupled to each of the gate lines;
and a source driving circuit, configured to drive the display panel according to the display data, comprising:
a plurality of operational amplifiers, respectively coupled to the source lines, and each configured to receive an input signal and generate an output signal according to the input signal for driving the pixel connected to the corresponding source line;
and a slew rate enhancement circuit, coupling a power source to at least one of the operational amplifiers to enhance a slew rate of the at least one of the operational amplifiers, wherein the adjustment unit comprises:
a sourcing portion, providing a first compensation current through the current source based on the control signal;
and a sinking portion, draining a second compensation current through the current source based on the control signal.

5 more elements

Dependencies are inferred from the claim text.

Slew rate enhancement circuit

Life of this patent

Slew rate enhancement circuit

Life of this patent

Abstract

Claims18