Touch Panel Sensor Charge Uniformity via Localized Period Adjustment
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Solution Overview
Problem
Conventional touch panels face issues with noise interference and non-uniform charge characteristics among touch sensors, leading to erroneous touch event detection due to uniform charging periods.
Innovation Solution
A control circuitry adjusts the charge periods of touch sensors based on their individual characteristics and a preset limit, ensuring all sensors reach a uniform charge level while minimizing noise interference by setting different charge periods and delays as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all touch sensors are charged according to the same charge period, then the charging process is simple and uniform, but far-end touch sensors are undercharged while near-end touch sensors are overcharged
Solution Approach 1:
The patent applies local quality by assigning different charge periods to different touch sensors based on their specific locations and equivalent capacitances. Each touch sensor group (e.g., first through fourth groups) receives customized charge periods that match their local charge characteristics, ensuring accurate charging without overcharge or undercharge.
Solution Approach 2:
The patent changes the charging parameter (charge period) to resolve the contradiction. By adjusting the charge period duration for different sensor groups based on their equivalent capacitances and time constants, the system achieves both manufacturing simplicity and charging accuracy.
2Reliability
If the charge period is extended to allow far-end touch sensors to charge fully, then all sensors can be charged, but near-end touch sensors become overcharged
Solution Approach 1:
The patent divides touch sensors into multiple groups with different charge periods matched to their local charge characteristics. This prevents overcharge of near-end sensors while ensuring complete charging of far-end sensors, as each group's charge period is optimized for its specific time constant.
Solution Approach 2:
The patent segments the touch sensor array into multiple groups (first through fourth groups) that are charged in separate time intervals. This segmentation allows each group to be charged according to its specific requirements without affecting other groups, eliminating the overcharge problem.
3Object-generated harmful factors
If the charge period is shortened to prevent overcharge of near-end touch sensors, then near-end sensors are charged accurately, but far-end touch sensors remain undercharged
Solution Approach 1:
The patent segments charging into multiple time intervals with different durations. Near-end sensors are charged during shorter intervals while far-end sensors receive extended charging time in later intervals, ensuring both groups achieve appropriate charge levels without overcharge or undercharge.
Solution Approach 2:
The patent changes the charge period parameter for different sensor groups based on their equivalent capacitances. Sensors with larger equivalent capacitances (far-end) receive longer charge periods, while sensors with smaller equivalent capacitances (near-end) receive shorter charge periods, preventing overcharge while ensuring adequate charging.
4Device complexity
If touch sensors with different equivalent capacitances are charged with the same period, then the charging control is simple, but the charge characteristics become non-uniform
Solution Approach 1:
The patent applies local quality by tailoring charge periods to the specific equivalent capacitance of each sensor group. This creates locally optimized charging conditions that maintain charge characteristic uniformity across sensors with different capacitances, while the overall control remains manageable through systematic grouping.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate touch event detection by uniformly charging touch sensors, reducing noise interference and preventing undercharge or overcharge, thereby enhancing the reliability of touch panel scanning.
Implementation Method 1
The touch panel includes a plurality of touch sensors. The control circuitry charges each of the touch sensors according to a preset charge period of the touch sensor
Data Source
AI summary
An electronic device and a method for scanning a touch panel of the electronic device are provided. The electronic device includes a touch panel and a control circuitry. The touch panel includes a plurality of touch sensors. The control circuitry is coupled to the touch panel. The control circuitry charges each of the touch sensors according to a preset charge period of the touch sensor and detects the maximum difference in charge characteristics of the touch sensors. The control circuitry adjusts the preset charge periods of the touch sensors according to the charge characteristics of the touch sensors and a preset limit of the preset charge periods of the touch sensors when the maximum difference is higher than a preset threshold.