Stretchable Display Panel Lead Layout for Higher Stretch Rate
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Solution Overview
Problem
Existing flexible stretchable display technologies have a low stretch rate due to signal lines in the bridge area of the flexible substrate, which restricts the overall stretching performance of the display panel.
Innovation Solution
A display panel design featuring a stretchable substrate with island and bridge areas, where the flexible substrate includes hollow areas and a driving circuit layer with connecting leads that pass through the bridge area, allowing the connecting leads to sink or protrude when the substrate is unstretched, thereby improving the stretch rate by transitioning from a bent to a straight state during stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal lines are disposed on the flexible substrate in the bridge area, then the display panel can achieve stretching function, but the stretch rate is limited to low levels
Solution Approach 1:
The flexible substrate is divided into island areas (for light emitting devices) and bridge areas (for connecting wires), with the signal lines specifically routed through the bridge areas. This segmentation allows the island areas to stretch independently while the bridge areas accommodate the signal lines, resolving the contradiction between achieving stretching function and maintaining high stretch rate.
Solution Approach 2:
The bridge area acts as an intermediary structure that connects the island areas while accommodating the signal lines. By placing signal lines in the bridge area rather than directly on the flexible substrate in the island area, the design enables the island areas to achieve higher stretch rates while the bridge area manages the electrical connections.
2Device complexity
If the flexible substrate is used to carry both light emitting devices and signal lines, then the structure is simplified, but the stretch rate of the display product is reduced
Solution Approach 1:
The substrate is segmented into functional zones: island areas for light emitting devices and bridge areas for signal lines. This spatial separation allows each zone to be optimized for its specific function, enabling the island areas to achieve high stretch rates while the bridge areas handle the signal line routing, thus resolving the contradiction between structural simplicity and stretch rate.
Solution Approach 2:
Different regions of the flexible substrate are assigned different functions and structural characteristics. The island areas are designed for maximum stretchability to accommodate light emitting devices, while the bridge areas are designed to accommodate and protect signal lines. This local differentiation resolves the contradiction by allowing the overall structure to remain relatively simple while achieving high stretch rates in the critical island areas.
Data Source
AI summary
A display panel, a preparation method therefor, and a display device. The display panel includes: a stretchable substrate including: island areas in array, bridge areas, blanking areas outside the island areas and the bridge areas; the bridge area connects two adjacent island areas; a flexible substrate on one side of stretchable substrate, the flexible substrate includes: a hollow area corresponding to bridge and blanking areas; a driving circuit layer on one side away from stretchable substrate, of the flexible substrate; the driving circuit layer includes: drive units and connecting leads; the drive units are in island areas, the connecting lead passes through the bridge area and extends to the island area to be electrically connected with the drive unit; in unstretched state, at least parts of the connecting lead sinks on one side facing the flexible substrate or the connecting lead protrudes on one side away from the flexible substrate.