Foldable Display Adhesive Thickness Zoning for Image Stability
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Solution Overview
Problem
Existing foldable display apparatuses experience a deterioration in display quality when folded due to deformation of parts.
Innovation Solution
A display apparatus design featuring a display panel with distinct adhesive layer thicknesses in non-folding and foldable areas, where the adhesive layer in the foldable area has a greater thickness than in non-folding areas, and a refractive index of 1.5 to 1.6, enhancing structural integrity and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the adhesive layer has uniform thickness across the display panel, then the manufacturing process is simple, but the display quality deteriorates when folded due to deformation
Solution Approach 1:
The adhesive layer is designed with different thicknesses for different regions: a first thickness in the non-foldable area and a second thickness in the foldable area. This local differentiation allows the adhesive layer to provide appropriate support and flexibility for each region, preventing deformation and maintaining display quality in the foldable area while keeping the non-foldable area stable.
Solution Approach 2:
The adhesive layer is segmented into multiple portions with different thicknesses corresponding to different functional areas of the display panel. The first adhesive layer portion covers the non-foldable area with a first thickness, while the second adhesive layer portion covers the foldable area with a second thickness, allowing each segment to perform its specific function optimally.
2Reliability
If the adhesive layer thickness is increased in the foldable area, then the structural integrity and display quality are maintained during folding, but the manufacturing precision becomes more difficult to control
Solution Approach 1:
The adhesive layer thickness parameter is changed according to the functional requirements of different regions. By setting the first thickness for the non-foldable area and the second thickness for the foldable area, the structure achieves optimal reliability in each region. The thickness values are carefully selected to balance structural integrity with manufacturing feasibility.
3Stability of the object's composition
If the adhesive layer has varying thickness, then the deformation during folding is minimized, but the device complexity increases
Solution Approach 1:
The adhesive layer structure implements local quality by having different thicknesses in different regions. The first thickness in the non-foldable area provides stability, while the second thickness in the foldable area allows for controlled deformation, thereby maintaining display quality consistency throughout the folding process.
Data Source
AI summary
Provided is a display apparatus which includes a display panel including a display element, a window arranged on the display panel, a window protection layer arranged on the window, a hard coating layer arranged on the window protection layer, a first adhesive layer arranged between the window protection layer and the hard coating layer, and a second adhesive layer arranged between the window and the window protection layer. The display panel includes a first non-folding area, a second non-folding area, and a foldable area between the first non-folding area and the second non-folding area, the first adhesive layer includes a first-1 portion overlapping the first non-folding area, a first-2 portion overlapping the second non-folding area, and a first-3 portion overlapping the foldable area, and a thickness of the first-3 portion is greater than a thickness of each of the first-1 portion and the first-2 portion.