Touch Panel Adhesive Structure to Prevent Collision Fragment Scattering
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Solution Overview
Problem
Existing touch panels in vehicles and trains face safety issues due to insufficient adhesion between the cover and the protection layer, leading to fragmentation and potential injury during collisions.
Innovation Solution
A touch panel design featuring a glass base with detection and surrounding regions, equipped with first electrodes, an organic thin film, and a polyvinyl acetal resin adhesive layer that directly adheres the organic thin film and surrounding region to a glass cover, enhancing adhesion and preventing fragmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover is affixed to the substrate by an adhesive layer, then the cover is protected and the substrate is covered, but at the time of collision fragments of the substrate may peel from the adhesive layer and scatter due to insufficient adhesion
Solution Approach 1:
The invention applies different adhesion strategies to different regions of the substrate. The surrounding region (non-detection area) uses direct adhesion between the adhesive layer and the glass substrate, providing strong anchoring. The detection region maintains the organic thin film structure for touch sensitivity. This local differentiation ensures both strong adhesion to prevent fragment scattering and preservation of touch detection functionality.
Solution Approach 2:
The adhesive layer is designed to directly adhere to the glass substrate in the surrounding region before any collision occurs, creating a strong bond in advance. This preliminary adhesion structure ensures that during collision, the surrounding region remains firmly attached and prevents fragment scattering, while the detection region's organic thin film structure is preserved for touch functionality.
2Reliability
If the adhesive layer directly adheres the organic thin film and surrounding region to the cover, then adhesion is enhanced and peeling is prevented, but the structure becomes more complex
Solution Approach 1:
The invention segments the substrate into two distinct regions: a detection region with organic thin film covering the electrodes, and a surrounding region with direct glass substrate exposure for adhesive bonding. This segmentation allows the adhesive layer to directly attach to the glass in the surrounding region, enhancing adhesion reliability and preventing peeling, while preserving the touch detection functionality in the detection region.
Solution Approach 2:
Instead of having the adhesive layer adhere only to the organic thin film as in conventional designs, the invention inverts the approach by having the adhesive layer directly adhere to the glass substrate in the surrounding region. This inversion provides stronger adhesion and prevents peeling during collision, while the detection region's organic thin film structure remains intact for touch sensitivity.
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 enhanced adhesion significantly reduces the likelihood of fragmentation and scattering of touch panel components during collisions, thereby improving the safety of riders by minimizing injury from display devices.
Implementation Method 1
a first adhesive layer that adheres the first substrate to the cover... the first adhesive layer directly adheres the organic thin film to the cover
Data Source
AI summary
A touch panel includes a first substrate, a cover that is formed from glass and that is overlaid on the first substrate, and a first adhesive layer that adheres the first substrate to the cover. The first substrate includes a base that is formed from glass and that includes a detection region and a surrounding region surrounding the detection region, a plurality of first electrodes that is disposed in the detection region of a first main surface of the base, and that extends in a first direction, and an organic thin film that is formed on the first main surface of the base, and that covers the plurality of first electrodes. The first adhesive layer directly adheres the organic thin film to the cover, and the surrounding region of the first main surface of the base to the cover.