Flexible Display Buffer Layer Stress Management
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Solution Overview
Problem
Existing full-screen display devices face stress concentration and potential crease formation when bending the non-active region of a flexible screen, which can damage the screen or conducting wires.
Innovation Solution
A display panel design featuring a flexible screen body with a buffer layer having different hardness sections, specifically a first sub-buffer layer and a second sub-buffer layer, applied to the bending transitional and bending regions to manage stress concentration, along with a supporting layer and flexible printed circuit for structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-active region of the flexible screen body is bent to reduce frame width and increase screen-to-body ratio, then the screen-to-body ratio is improved, but stress concentration occurs at the bending position which can damage the screen or conducting wires
Solution Approach 1:
The buffer layer is applied specifically at the bending position (initial bending position in the non-active region) rather than uniformly across the entire flexible screen. This localized application provides stress relief exactly where needed during bending, while maintaining the flexibility and full-screen display effect in other regions. The buffer layer's hardness is specifically optimized for its location at the bending transition zone.
Solution Approach 2:
The buffer layer is pre-applied to the bending position before the bending operation occurs. This preparatory cushioning layer absorbs and distributes the stress that will occur during bending, preventing stress concentration and potential damage to the screen or conducting wires before they can occur. The buffer layer acts as a preventive measure against the harmful bending stresses.
2Object-affected harmful factors
If a buffer layer with different hardness sections is applied to the bending region, then stress concentration is prevented, but the device structure becomes more complex
Solution Approach 1:
The buffer layer is divided into different hardness sections (first sub-buffer layer and second sub-buffer layer) with different hardness values, where each section is positioned at specific locations within the bending region. The first sub-buffer layer with higher hardness provides structural support, while the second sub-buffer layer with lower hardness provides stress relief. This localized differentiation optimizes stress distribution while maintaining manufacturing feasibility through targeted material selection in specific zones.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a flexible screen body having a first region and a second region. The second region has a bending transitional region coplanar with the first region, a bending region, and an extending region connected in sequence. The first region is connected to the bending region through the bending transitional region and is at least a part of an active region. The bending region and the extending region are at least a part of a non-active region and not coplanar with the first region. The bending transitional region is another part of the active region or another part of the non-active region. The display panel further includes a buffer layer disposed on surfaces of the bending transitional region and the bending region at a stress concentration side thereof. At least two sections of the buffer layer have different hardnesses.