Flexible Display Panel Through-Holes for Bubble Prevention
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Solution Overview
Problem
Flexible OLED display panels face issues with bubble formation when protective films are attached, leading to appearance degradation and potential damage to lead lines due to the thickness difference between the display and step areas, causing bubbles to form in the step area.
Innovation Solution
A flexible display panel design with through-holes in the step area of the substrate to discharge trapped air during the bubble removal process, preventing bubble formation and protecting the lead lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is attached to the flexible substrate to protect the OLED display device, then the reliability of the display device is improved, but bubbles are generated between the protective film and substrate, worsening the appearance and potentially damaging lead lines
Solution Approach 1:
Through-holes are formed in the flexible substrate at the step area before attaching the protective film. This preliminary action creates escape paths for air bubbles that would otherwise form during the protective film attachment process, thereby preventing bubble-related appearance degradation and lead line damage while maintaining the protective function.
2Reliability
If the protective film is attached to cover the entire substrate including step area, then the protection coverage is improved, but air bubbles are trapped in the step area due to thickness difference, worsening the quality
Solution Approach 1:
Through-holes are specifically formed only in the step area of the flexible substrate, not in the display area. This localized modification addresses the specific problem of bubble formation in the step area while preserving the integrity and protective function of the substrate in the display area. The through-holes provide local air escape paths without compromising overall protection coverage.
3Object-affected harmful factors
If through-holes are formed in the step area to discharge trapped air, then the bubble formation is prevented, but the structural integrity of the substrate may be compromised
Solution Approach 1:
Through-holes are formed exclusively in the step area which has lower structural load requirements compared to the display area. The step area is designed to accommodate lead lines and bonding processes, making it the appropriate location for through-holes without compromising overall substrate strength. The localized approach minimizes impact on structural integrity while effectively eliminating bubbles.
Solution Approach 2:
Multiple small through-holes are distributed in the step area rather than one large opening. This distribution pattern provides sufficient air escape paths to prevent bubble formation while maintaining better structural integrity compared to a single large hole. The multiple small holes collectively achieve the bubble elimination function with minimal structural compromise.
Data Source
AI summary
A flexible display panel and a fabrication method for a flexible display panel are provided. The flexible display panel comprises a flexible substrate having a display area and a step area adjacent to the display area, a display device disposed on a top surface of the flexible substrate and in the display area, a bottom protective film disposed on a bottom surface of the flexible substrate, and a plurality of through-holes disposed in the step area and penetrating the flexible substrate.