Flexible Display Circuit Structure for Crack-Resistant Sub-Pixels
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Solution Overview
Problem
Conventional display apparatuses are vulnerable to external impacts and lack flexibility, leading to issues such as fine cracks and defects in the sub-pixel circuit areas, which can result in bright and dark spots during image display.
Innovation Solution
The display apparatus incorporates a substrate with a bottom metal layer that overlaps critical connection points between semiconductor layers, along with inorganic and organic insulating layers, and a valley structure in the insulating layers filled with organic material to enhance durability and flexibility, preventing fine cracks from propagating and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display apparatus structures are used, then manufacturing is simpler, but the display apparatus is vulnerable to external impacts and develops fine cracks
Solution Approach 1:
The patent segments the insulating layer structure by introducing a valley portion that divides the layer into distinct regions, allowing differential flexibility and crack propagation control in different areas of the display apparatus
Solution Approach 2:
The patent adds a vertical dimension feature by creating a valley portion that extends in the thickness direction, transforming a planar insulating layer into a three-dimensional structure that provides both mechanical support and flexibility
2Manufacturing precision
If rigid insulating layers are used, then manufacturing precision is improved, but flexibility and resistance to external impacts deteriorate
Solution Approach 1:
The patent applies local quality by creating a valley portion with different mechanical properties than the surrounding insulating layer, allowing the structure to have both rigid alignment features and flexible stress-absorbing regions in different locations
3Reliability
If simple insulating layer structures are used, then device complexity is reduced, but fine cracks propagate easily causing bright and dark spots
Solution Approach 1:
The valley portion acts as a pre-designed stress management feature that cushions and redistributes mechanical stress before it can propagate into fine cracks, preventing image defects before they occur
Solution Approach 2:
The valley portion serves as an intermediary structure between the rigid substrate and the flexible display components, mediating stress transmission and preventing direct crack propagation through the insulating layer
Data Source
AI summary
A display apparatus includes a substrate, a first silicon-based transistor including a first semiconductor layer and a first gate electrode. The first semiconductor layer includes a silicon-based semiconductor, and the first gate electrode overlaps the first semiconductor layer, at least one insulating layer on the first gate electrode, a first oxide-based transistor including a semiconductor layer. The semiconductor layer includes an oxide-based semiconductor, a first connection electrode electrically connecting the first semiconductor layer to the semiconductor layer of the first oxide-based transistor, and a bottom metal layer disposed between the substrate and the first silicon-based transistor and overlapping a portion of the first semiconductor layer of the first silicon-based transistor. A portion of the bottom metal layer overlaps a first connection point between a portion of the first semiconductor layer and the first connection electrode.