Input Detection Device Electrode Coupling Stability
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Solution Overview
Problem
Existing input detection devices face challenges in achieving stable coupling between the electrode on the counter substrate and the terminal on the pixel substrate, leading to potential disconnection and instability in touch detection.
Innovation Solution
The input detection device incorporates a second substrate with a height difference portion and an electrode layer on its main and side surfaces, using conductive paste to couple the electrodes to the terminal on the pixel substrate, enhancing coupling stability and reducing device thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conductive paste is used to couple the electrode on the counter substrate to the terminal on the pixel substrate, then the device thickness is reduced and manufacturing is simplified, but the coupling stability between electrode and terminal deteriorates
Solution Approach 1:
The electrode layer is extended from the main surface of the counter substrate onto its side surface, creating a three-dimensional configuration. This dimensional transition allows the electrode to physically bridge the gap between the counter substrate and pixel substrate, providing both mechanical support and electrical connection, thereby improving coupling stability while maintaining thin device profile.
Solution Approach 2:
The electrode layer is pre-formed on the side surface of the counter substrate before final assembly, creating a ready-made coupling structure. This preliminary preparation ensures that when the pixel substrate is positioned, the electrode is already in optimal position to establish stable electrical contact with the terminal, reducing assembly complexity and improving reliability.
2Area of stationary object
If the area of the second substrate is made smaller than the first substrate to reduce device space, then device compactness is improved, but the space for electrode coupling and terminal connection is reduced
Solution Approach 1:
By utilizing the side surface of the counter substrate as an extension of the electrode formation area, the invention effectively increases the available coupling space without increasing the planar footprint of the counter substrate. This vertical utilization of space allows adequate electrode-terminal connection area while maintaining a compact overall device design.
Data Source
AI summary
According to an aspect, an input detection device includes: a first substrate; a second substrate disposed to face the first substrate, the second substrate including a main surface having an area smaller than an area of a main surface of the first substrate; and a height difference portion disposed above the first substrate. An electrode layer is disposed on the main surface of the second substrate opposite to the first substrate and on a side surface of the second substrate constituting the height difference portion.