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US 11,900,858 B2Granted
Power management integrated circuit and display device including the same
AssigneeLx Semicon Co., Ltd.
InventorJung Min Choi
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a power management circuit including a multiplexer and a power converter, and can provide technology that implements a multiplexer selecting and outputting input power to the power management circuit and a power converter controlling input voltage of a timing controller as one integrated circuit.
Claims17
A power management integrated circuit comprising:
- a multiplexer configured to receive a display voltage or a touch voltage transferred by a host, select one of the display voltage and the touch voltage, and output a multiplexer output voltage;
- a buck circuit configured to receive the multiplexer output voltage, reduce a signal level of the multiplexer output voltage, and generate a driving voltage of a timing controller;
- and
- a voltage modulation circuit configured to receive the multiplexer output voltage and generating a gate high voltage, a gate low voltage, a common voltage, and a touch/display driving voltage,
- wherein the voltage modulation circuit is configured to modulate and output a waveform of at least one of the gate high voltage, the gate low voltage, the common voltage, and the touch/display driving voltage,
- wherein the multiplexer is configured to receive the display voltage as an enable signal to determine an output timing of the multiplexer output voltage.
3 more elements
A power management integrated circuit comprising:
- a multiplexer configured to receive a first input voltage in a first driving mode, receive a second input voltage in a second driving mode, select one of the first input voltage and the second input voltage, and output the selected input voltage as a multiplexer output voltage;
- a buck circuit configured to lower a signal level of the multiplexer output voltage and transfer the multiplexer output voltage to a timing controller;
- and
- a source readout voltage modulation circuit configured to change a signal waveform of the multiplexer output voltage and generate a modulated touch/display driving voltage and a common voltage,
- wherein the source readout voltage modulation circuit is configured to provide the modulated touch/display driving voltage and the modulated common voltage to a source readout circuit so as to perform both a display driving and a touch driving in the first driving mode,
- wherein an output port of the multiplexer is configured to transfer the multiplexer output voltage by forming a common node with the buck circuit and the source readout voltage modulation circuit disposed inside the power management integrated circuit.
3 more elements
A display device comprising:
- a source readout circuit configured to perform a touch/display operation of a panel;
- a timing controller configured to determine a timing of the touch-display operation of the source readout circuit;
- a power management circuit configured to generate a voltage transferred to the timing controller or the source readout circuit;
- and
- a touch microcontroller unit configured to control an operation of the power management circuit,
- wherein the power management circuit includes:
- a multiplexer configured to selectively output a first input voltage or a second input voltage,
- a buck circuit configured to receive an output signal of the multiplexer and control a signal level, and provide the output signal to the timing controller, and
- a voltage modulation circuit disposed separately from the buck circuit and configured to determine a signal waveform transferred to the source readout circuit,
- wherein the power management circuit is configured to selectively turn on/off at least a part of power transferred to an internal circuit of the voltage modulation circuit to control a signal transferred to the touch microcontroller unit.
7 more elements
Dependencies are inferred from the claim text.