Touch Panel Driving Voltage Timing for Lower Power Consumption
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Solution Overview
Problem
The increasing thickness of touch panels in electronic devices leads to larger capacitive loads and higher driving current, resulting in increased power consumption, necessitating a solution to reduce power consumption while maintaining signal power within a set value range.
Innovation Solution
A driving device and method that adjust the duration of the driving voltage by selecting and outputting multiple reference voltages in time intervals based on signal power, using a voltage selector to optimize power consumption and noise immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the touch panel thickness is reduced, then the device becomes thinner and more compact, but the capacitive load increases leading to higher driving current and power consumption
Solution Approach 1:
The patent implements dynamic adjustment of driving voltage duration based on real-time signal power monitoring. The driving device adjusts the time interval duration dynamically: when signal power exceeds a threshold, the duration is reduced; when signal power is insufficient, the duration is extended. This dynamic control optimizes power consumption while maintaining signal quality, directly resolving the contradiction between thin panel design and power consumption.
Solution Approach 2:
The patent changes the temporal parameter (duration) of the driving voltage signal based on signal power conditions. By adjusting the time interval duration as a controllable parameter, the system optimizes the balance between power consumption and signal effectiveness, addressing the power consumption issue arising from reduced touch panel thickness.
2Reliability
If the driving voltage duration is extended to maintain signal power, then noise immunity improves, but power consumption increases
Solution Approach 1:
The patent employs a feedback mechanism where the driving device monitors signal power in real-time and adjusts the driving voltage duration accordingly. When signal power is sufficient, the duration is reduced to lower power consumption; when signal power is insufficient, the duration is extended to maintain noise immunity. This closed-loop feedback control resolves the contradiction between reliability and power consumption.
Solution Approach 2:
The system dynamically adjusts the driving voltage duration based on real-time signal power monitoring, transitioning between different duration states to optimize both noise immunity and power consumption. This dynamic adaptation allows the system to maintain reliability only when necessary, reducing unnecessary power consumption during periods of sufficient signal power.
3Use of energy by moving object
If the driving voltage duration is reduced to lower power consumption, then signal power may fall below required levels, but power consumption decreases
Solution Approach 1:
The driving device uses feedback control to monitor signal power and adjust driving voltage duration in real-time. When signal power drops below a threshold, the system automatically extends the duration to maintain adequate signal power levels. This feedback mechanism ensures signal power requirements are met while minimizing power consumption by using shorter durations only when signal power is sufficient.
Data Source
AI summary
A driving device and a method for generating a driving voltage are provided. The method for generating the driving voltage is applicable to a driving device of a touch panel. The method includes: generating multiple different reference voltages; providing a voltage selector to select and output each of the reference voltages in each of multiple time intervals to generate a driving voltage; and setting a time length for each of the time intervals according to whether a signal power of the driving device is greater than a set value.