Touch Sensitive Device Ground Detection and Signal Compensation
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Solution Overview
Problem
Touch sensitive devices face difficulties in accurately recognizing touch events due to poor grounding, which leads to erroneous or distorted touch signals caused by capacitive coupling, affecting the reliability of user interactions.
Innovation Solution
The implementation of a system within the touch sensitive device to detect its grounded state, using various sensors and algorithms to monitor parameters indicative of grounding conditions, allowing for selective application of compensation to touch signal outputs to mitigate negative pixel effects and improve sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device continuously performs touch measurements to improve sensing accuracy, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The system performs touch measurements periodically rather than continuously, activating the touch sensor controller only when needed (e.g., when a touch event is detected or at scheduled intervals). This periodic operation maintains touch sensing capability while significantly reducing power consumption during idle periods when no touch events occur.
Solution Approach 2:
The system uses the touch sensor panel itself to detect grounding conditions by analyzing touch measurements taken during normal operation. By leveraging existing touch measurements for dual purposes (touch detection and grounding detection), the system avoids additional dedicated measurements that would consume extra power, while still maintaining accurate touch sensing.
2Measurement precision
If the device applies compensation for poor grounding to improve touch signal accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system continuously monitors touch measurements to detect grounding conditions and automatically adjusts compensation parameters based on the detected grounding state. This feedback mechanism enables the system to adapt to varying grounding conditions in real-time, maintaining touch signal accuracy without requiring complex manual calibration or multiple dedicated sensors.
Solution Approach 2:
The system changes processing parameters (compensation values, filtering settings) based on the detected grounding condition. When poor grounding is detected, the system applies specific compensation algorithms to correct the touch signals; when good grounding is detected, the system uses standard processing. This parameter adaptation allows a single device to handle multiple grounding scenarios without requiring physically complex hardware modifications.
3Reliability
If the device performs repeated touch measurements to compensate for poor grounding, then reliability is improved, but loss of time increases
Solution Approach 1:
The system performs preliminary detection of grounding conditions using initial touch measurements before processing subsequent touch events. By detecting grounding status in advance and pre-configuring appropriate compensation parameters, the system avoids the need for repeated measurements during actual touch events, thereby maintaining reliable touch recognition while minimizing time loss.
Solution Approach 2:
The system uses the same touch measurement mechanism for multiple purposes: detecting touch events, detecting grounding conditions, and providing data for compensation calculations. This multi-functionality eliminates the need for separate dedicated measurements for grounding detection, allowing the system to maintain high reliability across varying grounding conditions without incurring additional time penalties from redundant measurements.
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 enhances the accuracy and speed of touch sensing, reduces power consumption by avoiding unnecessary measurements, and enables the device to robustly adapt to varying grounding conditions, ensuring more reliable user interactions.
Implementation Method 1
The poor grounding can cause touch values representing the touch event to be erroneous or otherwise distorted by undesirable capacitive coupling introduced into the device.
Data Source
AI summary
Ground detection of a touch sensitive device is disclosed. The device can detect its grounded state so that poor grounding can be selectively compensated for in touch signals outputted by the device. The device can include one or more components to monitor certain conditions of the device. The device can analyze the monitored conditions to determine the grounding condition of the device. The device can apply a function to compensate its touch signal outputs if the device determines that it is poorly grounded. Conversely, the device can omit the function if the device determines that it is well grounded.