Stretchable Display Panel Laser Absorbing Layer for Smooth Lift-Off
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Solution Overview
Problem
Existing stretchable display panels face difficulties in separating from a glass plate during laser lift-off due to the overcoat's high laser transmittance, leading to adhesion issues and potential damage, which reduces yield.
Innovation Solution
Incorporation of a laser absorbing layer with low transmittance for wavelengths less than or equal to 400 nm, disposed on the substrate and circuit structures, to absorb the laser beam and facilitate smooth separation, reducing damage and enhancing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the overcoat has high laser transmittance to maintain flexibility and elasticity, then the stretchable display panel can be bent and stretched, but the overcoat cannot absorb enough laser energy to separate from the glass plate, causing adhesion issues and damage
Solution Approach 1:
A dedicated laser absorbing layer is introduced as an intermediary component between the overcoat and the glass plate. This layer specifically absorbs laser energy during LLO to facilitate separation, while the overcoat maintains its high transmittance and flexibility properties. The intermediary layer resolves the contradiction by taking on the separation function without compromising the overcoat's mechanical properties.
Solution Approach 2:
Different layers are assigned different optical properties: the overcoat maintains high laser transmittance to preserve flexibility, while the dedicated laser absorbing layer has low transmittance to enable effective LLO separation. This local differentiation of properties allows each layer to optimize its specific function without compromising the overall system performance.
2Manufacturing precision
If the flexible substrate has low laser transmittance to absorb laser beam for separation, then the stretchable display panel can separate from the glass plate, but the overcoat with high transmittance cannot separate smoothly, causing damage and reduced yield
Solution Approach 1:
The laser absorbing layer serves as a mediator that ensures complete separation of both the flexible substrate and the overcoat from the glass plate. By positioning this layer to extend beyond the overcoat boundaries, it guarantees that the entire stack separates uniformly, preventing damage and improving production yield.
Solution Approach 2:
The separation function is segmented into different components: the flexible substrate's low transmittance handles its own separation, while the dedicated laser absorbing layer handles the overcoat's separation. This segmentation allows each component to be optimized independently for its specific separation requirements.
3Strength
If the overcoat absorbs limited laser energy due to high transmittance, then the flexible substrate can separate, but the overcoat adheres to the glass plate causing the stretchable display panel to be pulled and damaged
Solution Approach 1:
The laser absorbing layer acts as a mediator that absorbs the laser energy required for separation, preventing the overcoat from adhering to the glass plate. This intermediary action protects the integrity of the stretchable display panel by ensuring smooth separation without pulling or damage.
Solution Approach 2:
The potential harm of the overcoat adhering to the glass plate during LLO is converted into a benefit by introducing the laser absorbing layer. This layer absorbs the laser energy that would otherwise pass through the overcoat, transforming the problem of high transmittance into a solution where the overcoat separates smoothly while maintaining its original optical properties.
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 laser absorbing layer effectively absorbs the laser beam, allowing for smooth detachment of the stretchable display panel from the glass plate, minimizing damage and improving production yield.
Implementation Method 1
the laser absorbing layer is disposed in at least the openings... The laser absorbing layer effectively absorbs the laser beam, allowing for smooth detachment of the stretchable display panel from the glass plate
Data Source
AI summary
A stretchable display panel includes a substrate, a plurality of circuit structures, a plurality of light-emitting components, a plurality of signal lines, a laser absorbing layer and a stretchable filling material. The substrate has a plurality of island sections and a plurality of bridge sections. The island sections are connected to the bridge sections, and both the island sections and the bridge sections define the openings of the substrate. The circuit structures are disposed on the island sections. The light-emitting components are disposed on the circuit structures. The signal lines are disposed on the bridge sections, and the signal lines are electrically connected to the circuit structures. The laser absorbing layer is disposed in at least the openings. The stretchable filling material is disposed above the substrate, where the stretchable filling material covers at least both the laser absorbing layer and the light-emitting components.