Stretchable Touch Panel Unit Pattern Design for Laser Lift-Off Efficiency
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Solution Overview
Problem
Existing touch panels face challenges in achieving process stability and efficient laser lift-off processes, particularly due to wide contact areas between glass substrates and adhesive layers, leading to defects and reduced efficiency.
Innovation Solution
A stretchable touch panel design is implemented, featuring a touch pattern layer with stretching patterns and a touch electrode layer, where each unit pattern includes a first sub-unit pattern overlapping unit electrodes and a second sub-unit pattern inside, reducing the contact area between the adhesive layer and the glass substrate, thereby enhancing stretching reliability and laser lift-off efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wide contact area between glass substrate and adhesive layer is used, then bonding strength is improved, but laser lift-off efficiency deteriorates
Solution Approach 1:
The touch electrode layer is divided into multiple unit electrodes, and the stretching pattern is divided into multiple unit patterns. This segmentation allows the adhesive layer contact area to be reduced at critical regions while maintaining overall bonding strength through the distributed pattern structure.
Solution Approach 2:
The stretching pattern acts as an intermediary structure between the touch electrode layer and the adhesive layer. By introducing this intermediate pattern layer with controlled contact areas, the patent enables both adequate bonding strength and efficient laser lift-off process.
2Productivity
If the contact area between adhesive layer and glass substrate is reduced, then laser lift-off efficiency is improved, but bonding strength deteriorates
Solution Approach 1:
The stretching pattern creates local variations in the contact area between the adhesive layer and glass substrate. By strategically designing unit patterns with specific geometries, the patent achieves reduced contact area in regions requiring laser lift-off while maintaining sufficient bonding strength in other regions.
3Adaptability or versatility
If a stretchable touch panel structure is implemented, then flexibility and shape changeability are improved, but process stability deteriorates
Solution Approach 1:
The touch electrode layer is segmented into multiple unit electrodes arranged in a pattern, and the stretching pattern is segmented into unit patterns. This segmentation allows the structure to accommodate stretching and shape changes while maintaining consistent electrical performance and manufacturing process stability through modular repetition.
Solution Approach 2:
The patent employs specific geometric parameters for unit patterns and unit electrodes that enable the structure to maintain its functional properties during stretching. By optimizing parameters such as pattern size, spacing, and shape, the patent achieves both flexibility and process stability.
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 design improves stretching reliability and increases the efficiency of the laser lift-off process by narrowing the contact area between the adhesive layer and the glass substrate, reducing defects and enhancing overall process stability.
Implementation Method 1
laser lift off (LLO) process efficiency
Implementation Method 2
laser beam is irradiated to a lower portion of the glass substrate to thereby separate the glass substrate and the sacrificial pattern
Data Source
AI summary
A display device according to an example embodiment of the present disclosure includes a touch pattern layer having a plurality of stretching patterns; and a touch electrode layer disposed on the touch pattern layer and having a plurality of touch electrodes, wherein each of the plurality of stretching patterns includes a plurality of unit patterns, wherein each of the plurality of touch electrodes includes a plurality of unit electrodes, wherein each of the plurality of unit patterns includes a first sub-unit pattern overlapping each of the plurality of unit electrode electrodes, and a second sub-unit pattern disposed inside the first sub-unit. Accordingly, laser lift off (LLO) process efficiency for the touch panel can be increased.