Foldable Display Fan-Out Wiring for Narrow Bezel Uniformity
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Solution Overview
Problem
Existing display apparatuses face challenges in reducing the non-display area and achieving uniform light emission between adjacent pixels, particularly in flexible and foldable devices.
Innovation Solution
The display apparatus incorporates a substrate with a non-display area comprising a first area, a second area, and a bent area, featuring a fan-out portion with multiple data lines in different layers and configurations to transfer signals efficiently, including a first data line in the second area and a second data line in the pad area, with specific electrical connections and overlapping arrangements to enhance signal transfer and light uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the non-display area is reduced to increase display area, then the display area is improved, but the wiring layout complexity and signal transfer uniformity deteriorate
Solution Approach 1:
The patent transitions from planar wiring to three-dimensional stacked wiring, where data lines are arranged in multiple layers (first data line in first layer, second data line in second layer) connected via contact holes. This vertical dimensionality change allows compact wiring layout that reduces the non-display area while maintaining signal transfer functionality and uniformity.
Solution Approach 2:
The wiring structure is segmented into multiple functional layers: first data line layer, contact hole layer, and second data line layer. Each layer performs a specific function, allowing independent optimization of signal transfer paths and reducing interference between adjacent pixels, thus maintaining uniformity despite reduced non-display area.
2Area of moving object
If data lines are arranged in different layers to reduce non-display area, then the non-display area is improved, but the manufacturing process complexity worsens
Solution Approach 1:
The patent employs stacked wiring architecture where the second data line is positioned in a second layer above the first data line in the first layer. Contact holes penetrate through intermediate layers to establish electrical connections between corresponding endpoints. This vertical arrangement reduces the horizontal non-display area while using standard semiconductor layering techniques that are manufacturable with existing processes.
3Volume of moving object
If the bent area is minimized for compactness, then the device size is improved, but the stress on wiring and light emission uniformity deteriorate
Solution Approach 1:
By arranging data lines in stacked layers connected through contact holes, the patent creates a more robust wiring structure that better withstands bending stresses. The vertical connectivity through contact holes distributes mechanical stress more effectively compared to planar routing, maintaining wiring reliability in compact, bendable display devices.
Data Source
AI summary
A display apparatus includes: a substrate including a display area and a non-display area, where the non-display area includes a first area, a second area, a bent area and a pad area, and the bent area is arranged between the first area and the second area; a display portion arranged in the display area; a driving circuit portion arranged in the non-display area; and a fan-out portion arranged between the display portion and the driving circuit portion and in the first area, the bent area and the second area, where the fan-out portion transfers a data signal from the driving circuit portion to the display portion. The fan-out portion includes a first data line including a first first data line arranged in the second area and a second first data line arranged in the pad area and disposed in a layer different from the first first data line.