Curved Display Panel Fabrication with Protective Layer
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Solution Overview
Problem
Flexible display panels face issues with cracking or disconnection of internal circuit layers when bent, due to the thinness of the base substrate, which can lead to undesired display effects and reduced bending resistance.
Innovation Solution
A method of fabricating a curved display panel involves forming a protective layer with a photosensitive adhesive on the bending region, half-curing it using a mask plate, and then fully curing it after folding, to prevent damage to peripheral circuits during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the base substrate is made thin to reduce overall dimension and weight, then the display panel achieves narrower borders and better appearance, but the wiring of circuit structures may be easily broken or peeled off during bending
Solution Approach 1:
A protective layer is formed on the bending region before the folding process occurs. This preliminary protective measure ensures that when the thin base substrate is folded, the circuit structures are already protected from mechanical damage, solving the contradiction between thin substrate design and circuit integrity during bending
Solution Approach 2:
The protective layer acts as an intermediary element between the thin base substrate and the mechanical stress during folding. This intermediate layer absorbs and distributes the stress, preventing direct damage to the circuit structures while allowing the thin substrate to achieve the desired narrow border configuration
2Area of stationary object
If the non-display region is folded back to reduce border size, then the display area appears bigger and the device looks better, but cracks and disconnections occur in the internal circuit layer
Solution Approach 1:
The protective layer is applied to the bending region before the folding operation. This preliminary protection prevents cracks and disconnections from occurring when the non-display region is folded back, allowing the display area to be maximized without compromising circuit integrity
Solution Approach 2:
The protective layer provides beforehand cushioning to the circuit structures in the bending region. This cushioning effect absorbs the mechanical stress during folding, preventing harmful cracks and disconnections while enabling the non-display region to be folded back for larger display area
3Reliability
If a protective layer is formed on the bending region to protect circuit structures, then bending resistance is enhanced and circuit damage is minimized, but the manufacturing process becomes more complex
Solution Approach 1:
The protective layer is selectively formed only on the bending region where circuit structures are located, rather than covering the entire substrate. This localized approach enhances bending resistance where needed while minimizing the impact on the overall manufacturing process complexity
Solution Approach 2:
The protective layer is formed as part of the preliminary fabrication steps before the folding operation. By integrating this protective measure into the existing manufacturing flow at an appropriate stage, the process complexity is minimized while still achieving enhanced bending resistance
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
This method effectively minimizes damage to the circuit structures during bending, reducing the risk of cracking and disconnection, and enhances the bending resistance of the display panel.
Implementation Method 1
forming a protective layer at least on a bending region, the bending region being in a non-display region containing peripheral circuits of the display panel, to cover the peripheral circuits
Data Source
Figure 1~3
Figure 4~5a
Figure 5b~6
AI summary
A display panel and display device, and fabrication methods are provided. The method for fabricating the display panel includes forming a protective layer (04) at least on a bending region (C), the bending region (C) being in a non-display region (B) containing peripheral circuits (03) of the display panel, to cover the peripheral circuits (03), and folding the display panel at the bending region (C) towards a back surface of the display panel. When the display panel is folded at the bending region (C) towards the back surface of the display panel, the protective layer (04) coated on the bending region (C) provides protection for the peripheral circuits (03) formed on the surface of the bending region (C).