Touch-Sensing Driver IC With Adaptive Sampling to Cut Detection Delay
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Solution Overview
Problem
Existing touch detection systems in universal terminal devices suffer from delays due to fixed sampling frequencies, which hinder efficient and timely detection of touch events.
Innovation Solution
A driver integrated circuit with a touch sensing control circuit that switches between multiple detection modes, including a first detection operation at a lower frequency and a second detection operation at a higher frequency, allowing for high-frequency sampling to reduce delay and improve touch event detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fixed sampling frequency is used for touch detection, then power consumption is reduced and system stability is maintained, but touch detection delay increases and responsiveness deteriorates
Solution Approach 1:
The patent implements dynamic sampling frequency adjustment by switching between first detection mode (lower frequency) and second detection mode (higher frequency) based on touch event detection. The touch sensing control circuit dynamically changes the sampling frequency of the touch panel, transitioning from a static fixed-frequency system to a dynamic adaptive-frequency system that responds to touch events, thereby reducing detection delay while maintaining system stability during normal operation.
Solution Approach 2:
The patent changes the sampling frequency parameter of the touch panel based on detected touch events. When a touch event is detected, the system switches from the first detection mode with lower sampling frequency to the second detection mode with higher sampling frequency. This parameter change allows the system to adapt its detection performance to operational needs, reducing delay during touch interactions while conserving resources during normal states.
2Measurement precision
If high sampling frequency is used continuously, then touch detection precision and responsiveness are improved, but power consumption increases
Solution Approach 1:
The patent employs periodic action by implementing intermittent high-frequency sampling only when touch events are detected, rather than continuous high-frequency sampling. The system alternates between low-frequency operation (first detection mode) and high-frequency operation (second detection mode) based on touch event occurrence. This periodic switching pattern achieves high measurement precision during touch events while avoiding continuous power consumption, effectively balancing precision and energy efficiency.
Solution Approach 2:
The patent applies partial action by using high sampling frequency only when necessary (during touch events) rather than continuously. The system performs excessive sampling (higher frequency than minimum required) specifically during touch detection periods to ensure accurate capture of touch events, while using minimal sampling during non-touch periods. This selective application of sampling resources achieves high precision when needed without the continuous power cost.
Data Source
AI summary
A driver integrated circuit for touch sensing and a driving method thereof are provided. The driver integrated circuit includes a touch sensing control circuit. The driver integrated circuit is adapted for driving a touch panel with a touch sensor. The touch sensing control circuit is configured to drive the touch panel to execute a first detection operation. The touch sensing control circuit drives the touch panel to execute a scanning operation after receiving a touch signal. After executing the scanning operation, the touch sensing control circuit drives the touch panel to execute a second detection operation. A sampling frequency of the second detection operation is higher than a sampling frequency of the first detection operation.