Stretchable Display Substrate Bezel Layout for Curved AMOLEDs
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Solution Overview
Problem
Existing AMOLED display apparatuses lack stretchability, making it difficult to be applied to curved display products due to the inflexibility of the bezel area.
Innovation Solution
A display substrate with a flexible substrate featuring stretchable regions and signal lines that are designed to avoid overlapping with holes, protected by isolation columns and layers, allowing for curvature without compromising functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the bezel area is made rigid to maintain structural stability, then the structural stability is improved, but the stretchability required for curved displays deteriorates
Solution Approach 1:
The display substrate is divided into a display area and a non-display area (bezel area), with the stretchable region specifically located in the non-display area. This segmentation allows the bezel area to be independently designed with stretchable characteristics while the display area maintains its structural integrity.
Solution Approach 2:
The patent applies different structural qualities to different regions: the display area uses a rigid structure for stability, while the non-display area uses a stretchable structure with holes and isolation columns to enable curvature. This local differentiation resolves the contradiction between overall stability and local stretchability.
2Adaptability or versatility
If signal lines are placed in the non-display area to maintain display functionality, then the display functionality is improved, but the signal integrity deteriorates due to overlap with stretchable holes
Solution Approach 1:
The signal lines are extracted from the stretchable region and placed in the non-display area where they do not overlap with the holes. This extraction eliminates the harmful interaction between signal lines and the stretchable structure, preserving signal integrity while maintaining display functionality.
Solution Approach 2:
Isolation columns are introduced as intermediary structures between the signal lines and the holes. These isolation columns prevent direct contact between the signal lines and the stretchable region, acting as a protective barrier that maintains signal integrity during stretching.
3Adaptability or versatility
If the flexible substrate is made fully stretchable to enable curved displays, then the flexibility is improved, but the manufacturing precision deteriorates due to alignment difficulties
Solution Approach 1:
The substrate is segmented into stretchable and non-stretchable regions, with the stretchable region containing an array of holes. This segmentation provides a clear structural framework that maintains alignment precision during manufacturing while enabling flexibility in the designated stretchable areas.
Solution Approach 2:
The holes are pre-formed in the flexible substrate before other components are added. This preliminary action creates a stable reference structure that guides subsequent manufacturing steps, ensuring alignment precision is maintained even though the substrate has stretchable capabilities.
4Reliability
If isolation structures are added to protect signal lines from moisture, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The isolation columns serve multiple functions: they act as physical barriers to prevent moisture ingress, provide structural support during stretching, and maintain the positional alignment of signal lines. This multi-functionality reduces the need for additional separate protective structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The isolation columns are integrated with the existing substrate structure and hole array pattern, combining protective functionality with the stretchable design. Rather than adding separate protective layers, the isolation columns are merged into the fundamental substrate architecture, minimizing overall structural complexity.
Data Source
AI summary
A display substrate has a display area and a non-display area adjacent to the display area. The display substrate comprises: a flexible substrate including at least one stretchable region, the stretchable regions extending from the display area to the non-display area, and being provided with a plurality of holes arranged in an array therein, and at least one signal line disposed on a first side of the flexible substrate and located in the non-display area, and an orthographic projection of the signal line on the flexible substrate is at least partially non-overlapping with each hole of the plurality of holes.