Segmented Planarization Sublayers for Bendable Display Panels
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Solution Overview
Problem
Current display technologies face challenges in maximizing the functionality of display panels while ensuring mechanical strength and display performance, particularly in bendable and foldable designs where color accuracy and durability are compromised.
Innovation Solution
A display panel design featuring a substrate with a driving circuit layer, a planarization layer comprising different composition sublayers, and a light-emitting unit layer, where the planarization sublayers in distinct regions accommodate varying mechanical and display requirements, ensuring flexibility and color accuracy through optimized material properties and structural arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform planarization layer is used across the entire display panel, then the manufacturing process is simple, but the mechanical strength and display performance are compromised in bendable regions
Solution Approach 1:
The planarization layer is divided into multiple sublayers (first planarization sublayer and second planarization sublayer) with different materials and functions. The first sublayer provides mechanical flexibility for bending regions, while the second sublayer ensures display performance and color accuracy, resolving the contradiction between manufacturing simplicity and reliability.
Solution Approach 2:
Different regions of the display panel are assigned different planarization sublayers based on their functional requirements. Bendable regions use materials with higher flexibility, while rigid regions use materials optimized for display performance, allowing each region to have the appropriate properties for its specific function.
2Ease of operation
If the display panel is designed to be bendable and foldable, then portability is improved, but color accuracy and structural integrity deteriorate
Solution Approach 1:
The planarization structure is segmented into multiple sublayers with different material compositions. The first sublayer uses materials optimized for flexibility to enable bending and folding, while the second sublayer uses materials optimized for optical performance to maintain color accuracy, thus resolving the contradiction between portability and color accuracy.
Solution Approach 2:
The patent employs composite material structures in the planarization layer, combining materials with different properties (flexibility vs. optical stability) in a multi-layer configuration. This allows the display panel to simultaneously achieve bendability for portability and color accuracy for display quality.
3Strength
If multiple planarization sublayers with different materials are used, then mechanical strength and color accuracy are improved, but device complexity increases
Solution Approach 1:
The planarization layer is divided into a first planarization sublayer and a second planarization sublayer, each with specific material compositions optimized for different functions. This segmentation allows the structure to achieve enhanced mechanical strength and color accuracy while maintaining a relatively simple overall architecture that can be integrated into existing display manufacturing processes.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate, a driving circuit layer, a planarization layer, and a light-emitting unit layer. The driving circuit layer is provided on a side of the substrate. The planarization layer is provided on a side of the driving circuit layer facing away from the substrate. The light-emitting unit layer is provided on a side of the planarization layer facing away from the driving circuit layer. The planarization layer includes a first planarization sublayer and a second planarization sublayer. The first planarization sublayer is arranged at least in a first region of the display panel. The second planarization sublayer is arranged at least in a second region of the display panel. Materials of the first planarization sublayer and the second planarization sublayer are different in composition.