Touch Sensing Display Control for Wake-Up Latency and Power Saving
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Solution Overview
Problem
Electronic devices experience latency in touch operations due to missed pulses of touch sensing signals during transitions from a sleep state to a normal state, leading to inefficiencies and increased power consumption.
Innovation Solution
The electronic device switches between a first touch sensing mode with a lower amplitude driving signal and a second touch sensing mode with a higher amplitude driving signal, ensuring that touch behavior immediately after entering the second mode does not experience a missed pulse, while reducing power consumption in the first mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic device uses a single high-amplitude touch driving signal in the normal state, then touch sensing accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the touch driving signal amplitude adaptive rather than fixed. The control circuit dynamically adjusts the signal amplitude based on the device's operational state: using high amplitude in normal state for accurate touch detection, and low amplitude in sleep state for reduced power consumption. This dynamic adaptation resolves the contradiction between maintaining sensing accuracy and reducing energy usage.
Solution Approach 2:
The patent changes the amplitude parameter of the touch driving signal based on operational mode. By switching between high-amplitude signals during normal operation and low-amplitude signals during sleep mode, the system optimizes both touch sensing performance and power efficiency, resolving the trade-off between measurement precision and energy consumption.
2Productivity
If the electronic device transitions from sleep state to normal state, then touch operations resume, but latency occurs due to missed touch sensing signal pulses
Solution Approach 1:
The patent applies preliminary action by ensuring the touch driving signal is already generated and available at the moment of state transition from sleep to normal mode. Rather than waiting for the next scheduled pulse cycle, the system proactively provides the touch driving signal immediately upon waking, preventing any missed pulses and eliminating the latency that would otherwise occur during state transitions.
3Stability of the object's composition
If the electronic device continuously provides touch sensing signals at the same frequency in both sleep and normal states, then signal consistency is maintained, but power consumption increases during sleep state
Solution Approach 1:
The patent makes the touch driving signal characteristics dynamic rather than static. During sleep state, the system uses low-amplitude signals at the same frequency to maintain basic signal consistency while reducing power consumption. Upon transitioning to normal state, the amplitude increases to provide full-strength touch sensing. This dynamic adjustment allows the system to maintain signal consistency where needed while optimizing power consumption during low-activity periods.
Data Source
AI summary
An electronic device is provided. The electronic device includes a control circuit and a plurality of sensing units. The control circuit switches between a first touch sensing mode and a second touch sensing mode of the electronic device. A first amplitude of a first touch driving signal provided by the control circuit operating in the first touch sensing mode is smaller than a second amplitude of a second touch driving signal provided by the control circuit operating in the second touch sensing mode.