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US 11,693,517 B2Granted
Touch power management circuit and touch driving system including the same
AssigneeLx Semicon Co., Ltd.
InventorsSeong Sik Yoon, Seong Wha Hong
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a touch power management circuit and a touch driving system comprising the same, and more particularly, relates to a touch power management circuit to generate signals required for a touch driving by using voltage sources different in a pen touch driving period and a finger touch driving period in order to reduce power consumption of a display device and a touch driving system comprising the touch power management circuit.
Claims20
A touch power management circuit comprising:
- a first driving signal generating circuit to output a finger touch driving signal, in which a first modulation voltage and a second modulation voltage alternate, during a finger touch driving period;
- and
- a second driving signal generating circuit to receive a first power voltage and a second power voltage from an external circuit and to output a pen touch driving signal, in which the first power voltage and the second power voltage alternate, during a pen touch driving period,
- wherein the first power voltage is higher than the first modulation voltage and the second power voltage is lower than the second modulation voltages;
- a first load free driving (LFD) signal generating circuit to receive a gate low voltage from a power management integrated circuit and to output, during the finger touch driving period, a first load free driving signal in which a gate low voltage and a third modulation voltage higher than the gate low voltage alternate.
2 more elements
A touch driving system comprising:
- a touch driving device to drive a plurality of touch electrodes disposed in a panel;
- and
- a touch power management circuit to output a finger touch driving signal to the touch driving device in a finger touch driving period and to output a pen touch driving signal to the touch driving device by using a first power voltage and a second power voltage inputted from an external circuit in a pen touch driving period,
- wherein the finger touch driving signal is a signal in which a first modulation voltage and a second modulation voltage alternate and the pen touch driving signal is a signal in which the first power voltage and the second power voltage alternate;
- a first load free driving (LFD) signal generating circuit to receive a gate low voltage from a power management integrated circuit and to output, during the finger touch driving period, a first load free driving signal in which a gate low voltage and a third modulation voltage higher than the gate low voltage alternate.
2 more elements
A touch power management circuit comprising:
- a first load free driving (LFD) signal generating circuit to receive a gate low voltage from a power management integrated circuit and to output a first load free driving signal, in which the gate low voltage and a modulation voltage higher than the gate low voltage alternate, during a finger touch driving period;
- and
- a second LFD signal generating circuit to receive a power voltage higher than the modulation voltage from an external circuit and to output a second load free driving signal, in which the gate low voltage and the power voltage alternate, during a pen touch driving period.
Dependencies are inferred from the claim text.