Foldable Display Lower Substrate With Spacing and Hole Patterns
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Solution Overview
Problem
Existing flexible display devices face challenges in managing stress and external impacts due to the lack of an effective lower substrate that can absorb and distribute these forces without compromising the display panel's integrity.
Innovation Solution
A display device with a lower substrate that includes a spacing portion and a pattern portion, where the spacing portion overlaps the folding region of the display panel and the pattern portion is spaced apart from the display panel by the spacing portion, featuring a plurality of holes that extend in a direction crossing the main direction of the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lower substrate is added to reduce stress and absorb impact, then the protection of the display panel is improved, but the device complexity increases
Solution Approach 1:
The lower substrate is divided into three distinct regions: a first region overlapping the first non-folding region, a second region overlapping the second non-folding region, and a third region overlapping the folding region. This segmentation allows each region to be optimized for its specific function while maintaining overall structural integrity and reducing complexity compared to a uniform substrate design.
Solution Approach 2:
The third region of the lower substrate includes a spacing portion and a pattern portion with specific structural characteristics, while the first and second regions have different configurations. This local quality differentiation enables the substrate to provide targeted stress distribution and impact absorption in the folding region while maintaining simplicity in the non-folding regions.
2Reliability
If the lower substrate is made thicker to improve impact absorption, then the protection capability is improved, but the device thickness increases
Solution Approach 1:
The pattern portion in the third region includes a plurality of holes that extend in a second direction crossing the first direction. These holes create a porous structure that enhances impact absorption capability by dissipating impact energy through the void spaces, while maintaining a relatively thin overall substrate thickness.
Solution Approach 2:
The lower substrate combines solid glass material with void spaces (holes) to create a composite structure. This composite design provides high impact absorption efficiency without requiring increased substrate thickness, as the void spaces contribute to energy dissipation while reducing material density.
3Stress or pressure
If the spacing portion height is increased to reduce stress transmission, then the stress isolation is improved, but the structural stability deteriorates
Solution Approach 1:
The spacing portion height is optimized to be less than or equal to one-third of the thickness of the lower substrate, with a specific range of about 10 micrometers to about 100 micrometers. This parameter optimization achieves effective stress isolation from the folding region while maintaining sufficient structural stability and preventing excessive substrate deformation.
Solution Approach 2:
The pattern portion with plurality of holes is integrated with the spacing portion to create a combined structure that reduces stress transmission. The holes provide additional compliance and stress distribution pathways, allowing the spacing portion to effectively isolate stress while the overall structure maintains stability through the distributed void network.
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 proposed solution reduces the transmission of tensile stress from the pattern portion to the display panel when the device is folded, thereby minimizing separation between the display panel and the lower substrate, and enhances the folding stability of the display device by filling the spacing portion with a resin material.
Implementation Method 1
a resin material filling the spacing portion
Data Source
AI summary
A display device includes a display panel having a first non-folding region, a folding region, and a second non-folding region consecutively arranged in a first direction. The folding region is adjacent to the first and second non-folding regions and is foldable about a folding axis. A lower substrate is disposed under the display panel. The lower substrate includes a spacing portion and a pattern portion. The spacing portion overlaps the folding region on a plane. The pattern portion is spaced apart from the display panel by the spacing portion in a thickness direction of the display device. The pattern portion includes a plurality of holes.