| 摘要 |
A display system includes a touch screen and a driving circuit. The touch screen includes touch sensors and a light source. A converter of the driving circuit receives an input voltage and provides a first output voltage to the light source according to a driving signal. A controller of the driving circuit converts the first output voltage to a second output voltage to drive the touch sensors, compares a voltage feedback signal indicating whether the second output voltage reaches a desired voltage level with a current feedback signal indicating whether a current through the light source reaches a desired current level, selects a feedback signal from the voltage feedback signal and the current feedback signal according to the comparison, and generates the driving signal to adjust the first output voltage according to the selected feedback signal.
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