Foldable Display Circuit Board Routing for Connection Stability
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Solution Overview
Problem
Foldable display devices face challenges in achieving high resolution and reliability while maintaining a compact form factor, as the folding mechanism can interfere with the electrical connections and increase the risk of mechanical stress on the display panel.
Innovation Solution
The display device incorporates a design with multiple non-folding and folding portions, where data driving chips are strategically positioned on pad areas, and a circuit board is attached to one of the non-folding portions, with connection lines extending to surround notches to maintain electrical connectivity and reduce mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data driving chips are positioned on multiple non-folding portions with circuit boards attached, then electrical connection stability is improved, but device complexity increases
Solution Approach 1:
The display device is divided into multiple non-folding portions (first, second, and third non-folding portions) with data driving chips positioned on separate pad areas. This segmentation allows electrical connections to be distributed across multiple stable regions, reducing the impact of folding stress on any single connection point and improving overall connection reliability.
Solution Approach 2:
Connection lines are introduced as intermediary elements that extend from the circuit board through folding portions to reach data driving chips on different non-folding portions. These connection lines act as flexible mediators that maintain electrical continuity while accommodating the mechanical deformation during folding operations.
2Reliability
If connection lines extend to surround notches to maintain electrical connectivity, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
Notches are pre-formed in the substrate at specific locations between pad areas before the connection lines are routed through them. This preliminary action creates predetermined pathways that guide the connection lines, ensuring they follow optimal routes that maintain electrical connectivity while accommodating folding movements, thereby reducing the complexity of subsequent manufacturing steps.
3Productivity
If multiple data driving chips are used on separate non-folding portions, then resolution and driving speed are improved, but device complexity increases
Solution Approach 1:
The data driving function is segmented across multiple independent chips positioned on different non-folding portions. Each chip can operate independently or in coordination, enabling parallel processing of display data which increases driving speed and resolution while distributing the computational load.
Solution Approach 2:
Multiple data driving chips are merged into a unified system through the circuit board and connection lines, creating a distributed architecture that combines the capabilities of individual chips to achieve higher overall performance in terms of resolution and driving speed.
Data Source
AI summary
A display device includes: a display panel having a first non-folding portion, a first folding portion, a second non-folding portion, a second folding portion, and a third non-folding portion arranged along a first direction, wherein each of the first to third non-folding portions has a display area, a bending area extending along a second direction crossing the first direction, and a pad area connected to the display area with the bending area interposed therebetween; a first data driving chip on a first pad area of the first non-folding portion; a second data driving chip on a second pad area of the second non-folding portion; a third data driving chip on a third pad area of the third non-folding portion; and a circuit board attached on any one of the first to third pad areas and electrically connected to the first to third data driving chips.