Flexible OLED Panel Circuit Segmentation for Bending Stress
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Solution Overview
Problem
Organic light emitting display devices face deterioration of driving elements when repeatedly bent due to stress, leading to damage and reliability issues.
Innovation Solution
The pixel driving circuits and gate driving circuits are disposed in non-bending areas, avoiding the bending area where stress is applied, and connection lines are used to connect organic light emitting elements to these circuits in non-bending areas, minimizing damage and maintaining reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel driving circuits are disposed in the bending area to maximize display area utilization, then the display area is fully utilized, but the driving elements deteriorate due to repeated bending stress
Solution Approach 1:
The display panel is divided into a bending area and a non-bending area. The bending area contains only organic light emitting elements for full display area utilization, while the non-bending area contains the pixel driving circuits. This spatial segmentation resolves the contradiction by separating the functions of light emission and circuit driving into different structural zones.
Solution Approach 2:
The pixel driving circuits are extracted from the bending area and relocated to the non-bending area. This extraction removes the vulnerable driving elements from the stress-prone bending zone, preventing deterioration while maintaining full display area utilization through the bending area's organic light emitting elements.
2Adaptability or versatility
If the entire active area is made bendable to achieve flexible display functionality, then flexibility is maximized, but the driving elements suffer damage from bending stress
Solution Approach 1:
The flexible substrate exhibits different mechanical properties in different areas: the bending area is designed to be flexible and bendable for display functionality, while the non-bending area maintains structural rigidity to protect the driving circuits. This local differentiation of mechanical properties resolves the contradiction between flexibility and stress protection.
Data Source
AI summary
Provided are an organic light emitting display panel and an organic light emitting display device. The organic light emitting display panel includes: an organic light emitting display panel. The organic light emitting display panel may include: a flexible substrate including a first non-bending area, a second non-bending area and a bending area between the first non-bending area and the second non-bending area; a plurality of organic light emitting elements disposed in the first non-bending area, the second non-bending area and the bending area; and a plurality of pixel driving circuits electrically connected to the plurality of organic light emitting elements, respectively, and disposed only in the first non-bending area and the second non-bending area. The organic light emitting element may include an anode, an organic emission layer, and a cathode.