Foldable Display Protector Thickness for Adhesion and Crack Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable display devices with light emitting elements face defects and yield issues in their foldable parts, necessitating improved design to enhance reliability and adhesion performance.
Innovation Solution
A foldable display device design featuring a flexible substrate with light emitting units in different regions, where the thickness ratio of protectors to the substrate varies, with a higher ratio in the foldable region to ensure better adhesion and reliability, using protectors of varying materials and structures to manage stress and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform thickness protectors are used across all display regions, then manufacturing is simplified, but adhesion and reliability deteriorate in foldable regions due to stress concentration
Solution Approach 1:
The patent applies different thickness specifications to protectors in different display regions. The first protector in the first display region has a first thickness, while the second protector in the foldable display region has a second thickness that is greater than the first thickness. This local differentiation optimizes adhesion and reliability in the foldable region while maintaining manufacturing feasibility through standardized production processes.
2Reliability
If thicker protectors are used in foldable regions, then adhesion and reliability improve, but device complexity increases due to varying thickness ratios
Solution Approach 1:
The patent implements local quality by specifying that the ratio of the second thickness to the substrate thickness in the foldable display region is greater than the ratio of the first thickness to the substrate thickness in the first display region. This targeted approach enhances reliability where needed while maintaining overall structural manageability.
Solution Approach 2:
The patent changes the thickness parameter of the protectors based on regional requirements. By adjusting the thickness ratio in the foldable region compared to the first display region, the patent optimizes adhesion performance without requiring a complete redesign of the entire device structure.
3Ease of manufacture
If standard thickness protectors are used, then manufacturing cost is reduced, but cracking probability increases in foldable regions under repeated stress
Solution Approach 1:
The patent addresses cracking resistance by implementing local quality enhancement in the foldable display region through increased protector thickness. The second protector has a greater thickness than the first protector, providing superior protection against cracking in the region subjected to repeated folding stress while maintaining cost-effectiveness in non-foldable regions.
Data Source
AI summary
A foldable display device having a foldable display region includes a flexible substrate, a plurality of first light emitting units disposed on the flexible substrate in the foldable display region, and a first protector disposed on at least one of the first light emitting units. The first protector has a surface, and at least a portion of the surface has a curved profile.