Foldable Display Panel Connection Pattern Density Optimization
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Solution Overview
Problem
Display panels face issues with afterimage defects and electrical reliability, particularly in the connection between light emitting elements and pixel drivers, which affect display quality and lifespan.
Innovation Solution
A display panel design featuring a base layer, a driving element layer with a transistor, and a light emitting element layer with specific electrode and connection pattern configurations, including a connection pattern layer with varying densities and structures in folding and non-folding areas, to enhance electrical connectivity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform connection pattern layer is used across the entire display panel, then the manufacturing process is simple, but afterimage defects occur and electrical reliability is reduced
Solution Approach 1:
The connection pattern layer is designed with different densities in different regions: a first connection pattern layer with higher density in the folding area and a second connection pattern layer with lower density in the non-folding area. This local differentiation optimizes electrical reliability where needed (folding area) while maintaining manufacturing efficiency elsewhere, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The connection pattern layer is segmented into two distinct layers (first connection pattern layer and second connection pattern layer) with different structures and densities. This segmentation allows each layer to be optimized for its specific functional requirement, improving overall electrical reliability without uniformly increasing complexity across the entire panel.
2Reliability
If the connection pattern layer has high density throughout, then electrical connectivity is improved, but manufacturing complexity and material usage increase
Solution Approach 1:
High-density connection patterns are applied only in the folding area where electrical reliability is most critical due to repeated bending stress. The non-folding area uses a lower-density pattern, reducing material consumption while maintaining sufficient connectivity where stress is minimal.
Solution Approach 2:
Instead of uniformly applying high-density connection patterns across the entire panel, the invention applies enhanced connectivity only partially in the folding area where it is most needed, achieving the necessary electrical reliability without excessive material usage throughout the whole panel.
3Duration of action of stationary object
If the display panel structure is optimized for folding durability, then lifespan is extended, but afterimage defects may occur due to connection issues
Solution Approach 1:
The connection pattern layer is specifically optimized in the folding area with higher density and different structural characteristics to withstand repeated bending cycles. This localized optimization ensures both folding durability (extending lifespan) and maintains electrical connectivity (preventing afterimage defects), resolving the contradiction between lifespan and display quality.
Solution Approach 2:
The connection pattern layer is designed in advance with different densities for folding and non-folding areas to preemptively address the electrical reliability issues that would arise from folding stress. This preliminary structural differentiation prevents afterimage defects before they occur, ensuring both lifespan and display quality.
Data Source
AI summary
A display panel includes a base layer bendable with respect to a virtual axis, a driving element layer including a transistor, and a light emitting element layer including a first electrode, emission layers disposed on the first electrode, and second electrodes disposed on the emission layers. One of the second electrodes is electrically connected to the transistor. The first electrode includes first sub electrodes overlapping the emission layers and a connection pattern layer that electrically connects the first sub electrodes. The connection pattern layer includes a first connection pattern layer that electrically connects the first sub electrodes in a first direction parallel to the virtual axis, and a second connection pattern layer that electrically connects the first sub electrodes in a second direction intersecting the first direction. The first connection pattern layer has a density greater than that of the second connection pattern layer.