Touch Display Device with Single-Substrate Electrodes
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Solution Overview
Problem
Touch display devices with multiple substrates for touch panels increase thickness and fabrication cost while reducing transmittance, as the touch electrodes on separate substrates are prone to corrosion and physical deterioration.
Innovation Solution
A touch display device with touch electrodes formed on opposite surfaces of a single base film, using an insulating pattern and flexible printed circuit to protect the electrodes and connection lines, reducing the number of substrates and preventing corrosion, and an adhesive material layer to attach the touch panel to the display panel with a cover glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple substrates are used for touch electrodes, then the touch panel can be formed, but the thickness increases and transmittance decreases
Solution Approach 1:
The patent combines both first and second touch electrodes on a single substrate instead of using separate substrates for each electrode layer. This merging approach eliminates the need for multiple substrate layers, thereby reducing the overall thickness of the touch panel while maintaining the mutual capacitance touch detection functionality.
Solution Approach 2:
The single substrate serves multiple functions: it acts as the base for both the first touch electrode and the second touch electrode, and also functions as part of the structural support layer. This multi-functionality reduces the number of separate components needed, thereby reducing thickness without compromising touch panel functionality.
2Reliability
If multiple substrates are used for touch electrodes, then the touch panel can be formed, but the fabrication cost increases
Solution Approach 1:
By merging the formation of both touch electrodes onto a single substrate, the patent reduces the number of substrate handling, alignment, and bonding processes required. This simplification of the manufacturing process directly reduces fabrication costs while maintaining the ability to form functional touch panels.
Solution Approach 2:
The patent extracts and eliminates the unnecessary intermediate substrate layer that would normally be required to support the second touch electrode. By removing this redundant substrate, the fabrication process is simplified, reducing both material costs and processing costs.
3Reliability
If multiple substrates are used for touch electrodes, then the touch panel can be formed, but the transmittance is reduced
Solution Approach 1:
The patent merges both touch electrode layers onto a single substrate, eliminating the need for multiple substrate layers that would block light transmission. This single-substrate approach maintains higher optical transmittance while still providing the necessary structural support and electrode functionality.
4Device complexity
If touch electrodes are exposed without protection, then the structure is simple, but corrosion and physical deterioration occur
Solution Approach 1:
The patent employs a thin insulating film layer to cover and protect the second touch electrode and connection lines. This thin film provides corrosion and physical deterioration protection while maintaining optical transparency and not significantly increasing structural complexity.
Solution Approach 2:
The insulating film acts as an intermediary layer between the exposed touch electrodes/connection lines and the external environment. This mediator layer prevents direct contact with corrosive elements while allowing the electrodes to function normally.
Data Source
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AI summary
A touch display device and method of manufacturing a touch display device are provided. The touch display device includes: a display panel, an adhesive material layer on the display panel, a touch panel on the adhesive material layer, the touch panel including: a base film, a first touch electrode on a bottom surface of the base film, a second touch electrode on a top surface of the base film, and an insulating pattern at an edge portion of the bottom surface of the base film, and a cover glass on the touch panel.