Touchscreen Abnormal Node Shielding for Fault Tolerance
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Solution Overview
Problem
Multi-touch capacitive touchscreens suffer from poor fault tolerance due to abnormal nodes with fluctuating capacitance values, leading to incorrect touch operation detection and reduced user experience.
Innovation Solution
A method is introduced to detect and calibrate capacitance values of nodes, discarding or calibrating abnormal nodes' values to prevent false touch detection, and prompt users to replace the touchscreen if multiple abnormal nodes are close, thereby improving fault tolerance and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large quantity of nodes are used on the touchscreen to improve resolution and coverage, then the touchscreen coverage and resolution are improved, but the probability of abnormal nodes increases due to complex manufacturing processes
Solution Approach 1:
The patent applies preliminary action by detecting and marking abnormal nodes during the manufacturing process before the touchscreen is delivered to users. The detection device identifies nodes with capacitance values outside the normal range and marks them, so that these abnormal nodes can be compensated or corrected before the product reaches the user, preventing false touch operations.
Solution Approach 2:
The patent applies parameter changes by adjusting the capacitance threshold parameters for abnormal nodes. The detection device measures capacitance values of each node and compares them against normal ranges. For abnormal nodes, the system modifies the capacitance variation thresholds or compensation values to account for their abnormal characteristics, allowing the touchscreen to tolerate these defects while maintaining overall functionality.
2Measurement precision
If the touchscreen detects capacitance variation of abnormal nodes, then the detection sensitivity is improved, but false touch operations occur due to spontaneous capacitance fluctuations of abnormal nodes
Solution Approach 1:
The patent applies preliminary action by pre-detecting and marking abnormal nodes during manufacturing before the touchscreen reaches the user. The detection device measures capacitance values of all nodes and identifies those with values outside the normal range, marking them for special handling. This preliminary identification allows the system to differentiate between abnormal nodes and normal nodes during operation, preventing false touch detection.
Solution Approach 2:
The patent applies feedback by implementing a closed-loop detection and compensation mechanism. The detection device continuously monitors capacitance values of nodes, compares them against stored normal ranges, and identifies abnormal nodes. The system then provides feedback by marking these nodes and adjusting their capacitance variation thresholds, creating a feedback loop that allows the touchscreen to adapt to and compensate for abnormal nodes, thereby reducing false touch operations.
3Measurement precision
If the touchscreen reports all nodes with capacitance variation exceeding threshold to the application processor, then the touch detection completeness is improved, but the processing load increases due to including abnormal nodes
Solution Approach 1:
The patent applies the taking out principle by extracting and separating abnormal nodes from the normal node processing flow. The detection device identifies nodes with capacitance values outside the normal range and marks them as abnormal. These marked abnormal nodes are then excluded from the standard touch detection reporting to the application processor, so that only normal nodes are included in touch operation reports, reducing unnecessary processing load.
Solution Approach 2:
The patent applies local quality by implementing different processing rules for different types of nodes. Normal nodes are processed with standard capacitance variation thresholds and reporting mechanisms, while abnormal nodes are processed with special compensation values and adjusted thresholds. This localized quality approach allows the system to maintain high detection completeness for normal nodes while reducing processing complexity by treating abnormal nodes differently.
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
The method effectively shields abnormal nodes' impact, enhancing touchscreen fault tolerance and user experience by accurately detecting touch operations and maintaining screen functionality.
Implementation Method 1
A multi-touch capacitive touchscreen includes an on-cell touchscreen and an in-cell touchscreen
Data Source
AI summary
A method for improving fault tolerance of a touchscreen determines an abnormal node, and shield the abnormal node to improve the fault tolerance of the touchscreen. The method includes detecting a capacitance value of each node in the touchscreen, comparing the detected capacitance value of each node with a preset capacitance value of each node to determine N target nodes, where N is an integer greater than or equal to zero, and the target nodes are nodes whose capacitance values vary, determining whether an abnormal node is included in the N target nodes, where the abnormal node is a target node determined when no touch operation occurs on the touchscreen, and discarding a row value, a column value, and a capacitance variation value of the abnormal node when the abnormal node is included in the N target nodes.