UV Blocking Layer for Flexible Display Metal Trace Integrity
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Solution Overview
Problem
Existing display panels face a risk of metal trace breakage in the bending area due to increased elastic modulus and decreased stretching rate of the organic film layer when irradiated with ultraviolet light, leading to poor vertical bright lines.
Innovation Solution
A display panel design that includes a base, a metal layer with a metal trace, and an organic film layer, where an ultraviolet blocking layer is disposed on the side of the organic film layer away from the metal layer, with its projection covering the bending area, thereby mitigating the effects of ultraviolet light irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ultraviolet light irradiation is applied to the organic film layer to improve crosslinking and structural stability, then the elastic modulus increases and stretching rate decreases, but the metal traces in the bending area are at risk of breaking
Solution Approach 1:
An ultraviolet blocking layer is introduced as an intermediary component between the ultraviolet light source and the organic film layer. This blocking layer selectively absorbs ultraviolet light while allowing the organic film layer to maintain its functional properties, thereby preventing the harmful effects of UV irradiation on metal traces without compromising the overall structural stability of the display panel
Solution Approach 2:
The ultraviolet blocking layer is specifically positioned to cover the bending area where metal traces are located, rather than uniformly treating the entire organic film layer. This localized approach allows different regions of the display panel to have different UV protection levels, preserving metal trace integrity in the bending area while maintaining optimal structural stability in other regions
2Stability of the object's composition
If the elastic modulus of the organic film layer is increased to reduce stretching rate, then the film becomes more stable, but the risk of metal trace breakage in the bending area increases
Solution Approach 1:
The display panel is divided into different functional zones: the bending area is covered by the ultraviolet blocking layer to maintain flexibility and prevent metal trace breakage, while other areas can have higher crosslinking and structural stability. This spatial segmentation allows the system to simultaneously achieve both flexibility where needed and stability where required
3Area of moving object
If the bending radius of the display panel is reduced to achieve larger screen-to-body ratio, then the bezel size decreases, but the stress on metal traces in the bending area increases
Solution Approach 1:
The ultraviolet blocking layer is pre-installed in the bending area to counteract the increased stress that will occur during bending operations. By preventing UV-induced stiffening of the organic film layer, the blocking layer maintains the panel's flexibility and reduces stress concentration on metal traces, enabling smaller bending radii without compromising structural integrity
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 implementation of the ultraviolet blocking layer effectively reduces the risk of metal trace breakage in the bending area, preventing poor vertical bright lines and enhancing the durability of the display panel.
Implementation Method 1
an ultraviolet blocking layer is disposed on the side of the organic film layer away from the metal layer, with its projection covering the bending area, thereby mitigating the effects of ultraviolet light irradiation
Data Source
AI summary
The present application provides a display panel, a manufacturing method thereof, and a mobile terminal. The display panel includes a display area and a bending area located at a side of the display area. The display panel includes a base, a metal layer and an organic film layer, which are laminated in order. The metal layer includes a metal trace, and at least a part of the metal trace is located in the bending area. The organic film layer at least covers the metal trace. The display panel further includes an ultraviolet blocking layer disposed at a side of the organic film layer away from the metal layer. A projection of the ultraviolet blocking layer covers the bending area.