Touch Driving Circuit Multi-Level Signal Power Optimization

The touch driving circuit operates in periodic cycles, alternating between an activation period where touch sensing is enabled and a sleep period where it is disabled. During the activation period, the circuit applies touch driving signals to the touch lines and detects touch inputs. During the sleep period, the circuit enters a low-power state by disabling the touch driving signals and reducing operational activity. This periodic operation allows the device to maintain touch detection capability when needed while significantly reducing power consumption during non-touch periods.

The invention merges the functions of multiple capacitor devices into a single capacitor device. The first and second switch groups share common connection nodes with the third switch group, and the capacitor device is strategically connected to these shared nodes. This configuration allows the single capacitor device to perform the voltage level stabilization function that would otherwise require multiple separate capacitor devices, thereby reducing component count while maintaining precise voltage level control for the multiple voltage levels (first, second, third, and fourth voltage levels) used in the touch driving circuit.

The third switch group serves multiple functions: it generates the third voltage level for the touch driving signal, it provides a common connection node shared with the first and second switch groups, and it enables the single capacitor device to stabilize voltage levels across all switch groups. This multi-functional design allows the circuit to achieve precise multi-level voltage control (first, second, third, and fourth voltage levels) with fewer total switch devices than would be required if each voltage level were generated by completely separate switch groups.