Touch Detection Chip Ghost Touch Elimination
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Solution Overview
Problem
Touch panels with single-layer ITO structures face issues with 'ghost touch' phenomena due to short circuits during manufacturing, leading to incorrect detection of touch positions and reduced product yield.
Innovation Solution
A touch detecting method and chip that determine candidate touch units by analyzing signal amounts and identifying the target touch unit based on adjacent unit signal thresholds, effectively distinguishing between real and ghost touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer self-capacitance structure is used to simplify the touch panel structure, then the manufacturing complexity is reduced, but ghost touch phenomena occur due to short circuits during manufacturing
Solution Approach 1:
The touch panel is divided into multiple touch units, each independently connected to the detection chip through separate touch electrode lines. This segmentation allows individual detection and identification of ghost touches in specific units, enabling the system to maintain overall functionality while isolating and correcting local detection errors.
Solution Approach 2:
A detection chip is introduced as an intermediary component between the touch units and the control system. The detection chip executes the touch detecting method to analyze signal amounts and determine target touch units, acting as a mediator that filters out ghost touch signals and identifies valid touch positions accurately.
2Adaptability or versatility
If each ITO touch unit is connected independently through touch electrode lines to enable multi-touch detection, then the touch detection capability is improved, but the susceptibility to short circuit defects increases
Solution Approach 1:
The system implements feedback by analyzing the signal amounts of adjacent touch units and using this information to verify and correct detection results. The detection chip compares signals from multiple units and uses threshold judgment to identify whether a detected touch is valid or a ghost touch, providing feedback that eliminates false detections.
Solution Approach 2:
The invention changes the detection parameter from simple capacitance change to a comprehensive analysis including signal amount thresholds and adjacent unit signal relationships. By introducing multiple judgment criteria (first preset threshold for candidate selection, second preset threshold for adjacent unit verification), the system can distinguish valid touches from ghost touches even in independently connected units.
3Speed
If traditional touch detection methods are used to maintain simple processing, then the detection speed is fast, but ghost touch errors cannot be distinguished from real touches
Solution Approach 1:
The system performs preliminary action by first determining candidate touch units based on signal amount thresholds before final verification. This two-stage process (first identifying candidates with signal > first preset threshold, then verifying with adjacent unit signals > second preset threshold) maintains speed by filtering obvious cases quickly while ensuring accuracy through selective detailed verification.
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
Prevents 'ghost touch' errors by accurately identifying real touch positions, enhancing the reliability and yield of touch panel manufacturing.
Implementation Method 1
sending a pulse detection signal to each of the plurality of touch units, and detecting a change amount of capacitance value of each of the plurality of touch units
Data Source
AI summary
A touch detection chip, a touch panel and a touch detecting method are disclosed. The touch detecting method includes: detecting a signal amount of each of a plurality of touch units; determining candidate touch units according to the signal amount of each of the plurality of touch units; and determining a target touch unit from the candidate touch units according to signal amounts of adjacent touch units of each of the candidate touch units.