Display Panel Curvature Stress Dispersion via Protection Sheet
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Solution Overview
Problem
Conventional display devices face damage to wiring when forming curvature parts due to concentrated bending stress at the border region between protection sheet formation and non-formation areas.
Innovation Solution
A display device design featuring an insulating base material with a wiring layer and display elements, along with protection sheets on both inner and outer surfaces, including projection parts that disperse bending stress through triangular shapes and varying distribution densities to alleviate damage during curvature formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection sheet is provided on the inner peripheral surface side of the film-like base material, then the base material is protected, but bending stress is concentrated onto the border region between protection sheet formation part and non-formation part causing wiring damage
Solution Approach 1:
The protection sheet is designed with varying thickness across its surface, with a first thickness in the display region and a second thickness (different from the first) in the curvature region. This local variation in thickness allows the protection sheet to provide adequate protection in the display region while reducing stress concentration in the curvature region where bending occurs, thereby resolving the contradiction between protection and stress concentration.
Solution Approach 2:
The invention changes the physical parameter of the protection sheet (thickness) to resolve the stress concentration problem. By making the thickness in the curvature region different from that in the display region, the protection sheet can accommodate bending stresses without causing concentration at the border region, thus preventing wiring damage while maintaining protective function.
2Area of stationary object
If the frame region is narrowed to expand display region or downsize device, then display area increases or device size reduces, but wiring damage risk increases due to curvature formation
Solution Approach 1:
The protection sheet has different thickness characteristics in different regions: a first thickness in the display region and a second thickness in the curvature region. This local differentiation allows the device to achieve narrow frames with expanded display regions while the varying thickness profile protects the wiring in curvature regions from stress concentration and damage.
Solution Approach 2:
The protection sheet is constructed as a composite structure with regions of different thickness, effectively creating a composite protective layer that combines the benefits of thicker protection in display areas with stress-absorbing thinner regions in curvature areas, thereby enabling narrow-frame designs without compromising wiring integrity.
Data Source
AI summary
A display device according to an embodiment of the present invention includes: a display panel including a display region, a backside region, and a curvature region, wherein the display panel comprises: an insulating base material disposed on the display region, the curvature region, and the backside region; a wiring layer that is disposed on an outer surface side of the insulating base material, and comprises an insulating layer and a wiring; a display element that is provided on an outer surface side of the wiring layer in the display region, and is electrically connected to the wiring; and a first protection sheet that is provided on an inner surface side of the insulating base material in the display region, and includes a plurality of projection parts that protrude toward a side of the curvature region from a side of the display region.