Patent ID: 11876513
Assignee: HIMAX TECHNOLOGIES LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 19:
20. A low power consumption boost circuit for providing high driving voltage of a touch circuit, comprising:
a charge pump circuit receiving a system voltage and correspondingly outputting a positive output voltage twice the system voltage and a negative output voltage with opposite polarity as the system voltage;
two digital-to-analog converters (DACs) connected to the charge pump circuit, wherein one of the DACs receives the positive output voltage from the charge pump circuit as supply voltage, and the other DAC receives the negative output voltage from the charge pump circuit as supply voltage; and
a switch circuit connected between the DACs and the touch circuit, wherein the DACs are connected between the charge pump circuit and the switch circuit;
wherein the DACs are alternately connected to the touch circuit by controlling the switch circuit, thereby driving the touch circuit alternately;
wherein the first switch and the second switch are utilized such that one of the first DAC and the second DAC is selected to be connected to the touch circuit for driving the touch circuit.