Stretchable Display Island-Bridge Layout for High Pixel Integration
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Solution Overview
Problem
Current stretchable display devices face challenges in achieving high pixel integration due to the difficulty in enlarging the non-stretching portions, which limits their manufacturing and performance.
Innovation Solution
A stretchable display device design featuring a substrate with island patterns and bridge patterns, where pixel light emitting chips with integrated transistors and light emitting elements are attached to the island patterns, allowing for high pixel integration even with reduced non-stretching area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the non-stretching portions are enlarged to accommodate more pixel circuits, then pixel integration degree improves, but the stretchable display device cannot maintain its stretchability and the overall device area is limited
Solution Approach 1:
The substrate is divided into multiple island patterns (non-stretching portions) and bridge patterns (stretching portions). The pixel circuits are segmented and distributed across multiple islands, allowing high pixel integration without requiring a single large non-stretching area. Each island can be independently sized to maintain stretchability while collectively providing sufficient space for high pixel density.
Solution Approach 2:
Instead of increasing pixel integration by expanding the area of individual non-stretching portions (2D expansion), the patent uses multiple islands arranged in a spatial distribution (utilizing 2D space differently). This allows the total pixel count to increase while each individual island maintains a size that preserves stretchability.
2Adaptability or versatility
If the non-stretching portions are reduced to maintain stretchability, then device flexibility improves, but pixel integration degree deteriorates
Solution Approach 1:
By segmenting the display into multiple small islands, each island can be kept small enough to maintain stretchability, while the collective array of islands provides high pixel integration. The segmentation allows the system to achieve both flexibility and high pixel density simultaneously.
Solution Approach 2:
Multiple small islands are combined to form the complete display structure. While each individual island is small (preserving stretchability), the merged structure of multiple islands provides the total pixel count needed for high integration. The bridges connecting islands are designed to accommodate stretching while maintaining electrical connections.
3Ease of manufacture
If pixel circuits are distributed across stretching portions, then manufacturing complexity reduces, but pixel positioning stability deteriorates during stretching
Solution Approach 1:
Different regions of the substrate are assigned different functions: island patterns are designed with non-stretching properties to maintain stable pixel positioning, while bridge patterns are designed with stretching properties to provide flexibility. This local differentiation allows pixel circuits to be placed in stable regions while the overall device remains stretchable.
Solution Approach 2:
The substrate is segmented into functional zones (islands for stable pixel positioning, bridges for stretching). This segmentation allows pixel circuits to be manufactured on stable island regions while the bridge regions handle the mechanical deformation, thus maintaining both manufacturing simplicity and positioning stability.
Data Source
AI summary
A stretchable display device and a method for fabricating the same is provided. A display device includes a substrate including a plurality of island patterns and a first bridge pattern connecting a first island pattern and a second island pattern adjacent to each other from among the plurality of island patterns, and a plurality of pixel light emitting chips, a pixel light emitting chip from among the plurality of pixel light emitting chips located on a corresponding island pattern from among the plurality of island patterns. Each of the plurality of pixel light emitting chips includes a transistor layer including a plurality of transistors, and a light emitting element layer on the transistor layer, and including a plurality of light emitting elements.