Gradient Elastic Modulus Display Panel Boundary Design
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Solution Overview
Problem
Stretchable display screens experience line breaking at the boundary between stretchable and unstretchable areas due to stress concentration from large differences in stretchability, reducing their reliability.
Innovation Solution
A display panel design featuring a substrate layer with a first part having holes for reduced elastic modulus and a second part with higher elastic modulus, along with a first elastic layer that covers the boundary line and has an increasing elastic modulus from the first part to the second part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stretchable display screen has a clear boundary between stretchable and unstretchable areas, then the driving devices can be installed in the unstretchable area, but lines at the boundary break due to stress concentration when stretched
Solution Approach 1:
The substrate layer is designed with spatially varying elastic modulus: the first region has lower elastic modulus for stretchability, the second region has higher elastic modulus for device stability, and the third region at the boundary has intermediate elastic modulus to gradually transition between the two extremes, reducing stress concentration at the boundary
Solution Approach 2:
The elastic modulus parameter of the substrate layer is changed across different regions. By controlling the elastic modulus to vary from the first region through the third region to the second region, the patent creates a gradient structure that smoothly transitions mechanical properties, preventing abrupt stress changes that cause line breaking
2Adaptability or versatility
If the elastic modulus difference between stretchable and unstretchable regions is large, then the stretchable area can be effectively stretched while the unstretchable area remains stable, but stress concentration occurs at the boundary causing line breaking
Solution Approach 1:
The third region acts as an intermediary zone between the stretchable first region and the unstretchable second region. This intermediate region with intermediate elastic modulus serves as a transition zone that mediates the mechanical stress between the two extreme regions, preventing direct stress concentration at a sharp boundary
Solution Approach 2:
The substrate layer is segmented into three distinct regions with different elastic modulus characteristics. This segmentation allows each region to be optimized for its specific function while the gradient transition between regions prevents the harmful effects of abrupt property changes
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 reduces the overall stretchability difference across the boundary, minimizing the risk of line breaking when the display panel is stretched, thereby enhancing its working reliability.
Implementation Method 1
an elastic modulus of the first elastic layer increases in a first direction, and the first direction is a direction from the first part to the second part
Data Source
AI summary
A display panel and a method for manufacturing the same, and a mobile terminal that include a substrate layer and a first elastic layer disposed on at least one side of the substrate layer and having an elastic modulus less than that of the substrate layer. The substrate layer includes a first part and a second part adjacently disposed to form a boundary line. An elastic modulus of the first part is less than an elastic modulus of the second part. A projection of the first elastic layer on the substrate layer covers the boundary line. The elastic modulus of the first elastic layer increases in a direction from the first part to the second part.