Capacitance Touch Panel AC-Coupled Electrode Disconnection Detection
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Solution Overview
Problem
Existing capacitance type touch panels cannot detect disconnection failures at the end portions of X or Y electrodes that are not connected to the extraction wiring, requiring direct probe contact which can introduce additional manufacturing errors.
Innovation Solution
Incorporating a conductive layer for AC-coupling the end portions of X and Y electrodes, allowing detection of disconnection failures without direct probe contact by utilizing coupling capacitance between the electrode end portions and the conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct probe contact is used to detect disconnection failures at electrode end portions, then detection capability is improved, but manufacturing precision deteriorates due to additional manufacturing errors
Solution Approach 1:
The patent introduces a conductive layer as an intermediary element that enables indirect detection of disconnection failures. Instead of directly contacting the electrode end portions with probes, the conductive layer is positioned to receive signals from the electrodes and transmit them to detection circuits. This intermediary structure allows detection without direct probe contact, thereby avoiding manufacturing errors while maintaining detection capability.
2Device complexity
If extraction wiring is connected to one end portion of electrodes, then device complexity is reduced, but detection capability at other end portions deteriorates
Solution Approach 1:
The patent extends the detection capability to the spatial dimension by introducing a conductive layer that spans across the electrode end portions not connected to extraction wiring. This conductive layer creates additional signal paths in a different spatial arrangement, enabling detection at locations that would otherwise be inaccessible without increasing wiring complexity.
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
Enables detection of disconnection failures at the end portions of X and Y electrodes without direct contact, reducing the risk of manufacturing errors and improving reliability.
Implementation Method 1
another end portion of the first Y electrode and another end portion of the second Y electrode have a coupling capacitance for AC-coupling the another end portion of the first Y electrode and the another end portion of the second Y electrode
Data Source
AI summary
Provided is a capacitance type touch panel, including: X electrodes which are arranged in parallel in a first direction; Y electrodes which are arranged in parallel in a second direction; and extraction wirings which are connected to one end portions of the Y electrodes, respectively. Each of the extraction wirings is connected to a terminal corresponding to the each of the extraction wirings, the terminal being formed at one side of the substrate. Provided that adjacent two of the Y electrodes are a first Y electrode and a second Y electrode, another end portion of the first Y electrode and another end portion of the second Y electrode have a coupling capacitance for AC-coupling the another end portion of the first Y electrode and the another end portion of the second Y electrode.