Flexible Printed Circuit Board Segmentation for Stretchable Displays
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Solution Overview
Problem
Conventional stretchable display devices face limitations due to the lack of elasticity in standard printed circuit boards, which restrict the display's ability to stretch effectively, leading to stress and potential damage.
Innovation Solution
A stretchable display device is designed with a flexible printed circuit board that includes a non-deformation region and a deformation region, featuring a stretchable base substrate with through holes and a compensating layer, allowing the circuit board to stretch and contract while minimizing stress and maintaining connectivity with the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard printed circuit board is used to connect the display panel, then the electrical connection is stable and reliable, but the elasticity and stretchability of the display device are limited
Solution Approach 1:
The flexible printed circuit board is divided into three distinct regions: a first region that remains substantially undeformed during stretching, a second region that deforms to accommodate stretching, and a third region that also remains substantially undeformed. This segmentation allows different parts of the circuit board to have different mechanical properties, enabling the board to maintain electrical connection stability in the undeformed regions while providing stretchability through the deformed region.
Solution Approach 2:
Different regions of the flexible printed circuit board are designed with different local properties. The first and third regions are designed to remain substantially undeformed to maintain stable electrical connections, while the second region is designed to deform during stretching to provide the necessary adaptability. This local differentiation of mechanical properties resolves the contradiction between reliability and stretchability.
2Adaptability or versatility
If the printed circuit board is made more elastic to accommodate stretching, then the stretchability improves, but the structural stability and potential for damage increase
Solution Approach 1:
By segmenting the circuit board into deformed and undeformed regions, the structure concentrates the mechanical stress of stretching into the second region while keeping the first and third regions stable. This prevents damage to the electrical connection areas while still providing the necessary stretchability.
Solution Approach 2:
The circuit board has different local mechanical properties: the second region is designed to be more compliant and deformable to accommodate stretching, while the first and third regions maintain higher structural stability to ensure reliable electrical connections. This local differentiation allows the board to be both stretchable and stable simultaneously.
3Adaptability or versatility
If the circuit component is disposed in the deformation region, then the flexibility is maximized, but the circuit component may be damaged during stretching
Solution Approach 1:
The circuit component is strategically positioned in the first region that remains substantially undeformed during stretching, rather than in the deformation region. This local placement decision ensures that the circuit component operates in a stable mechanical environment, protecting it from damage while the rest of the board provides the necessary flexibility through the second region.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The flexible printed circuit board enhances the display's elasticity, reducing stress and preventing damage during stretching and contraction, thereby improving the overall flexibility and durability of the stretchable display device.
Implementation Method 1
the flexible printed circuit board including a non-deformation region and a deformation region outside the non-deformation region... the flexible printed circuit board including: a stretchable base substrate... enhancing the display's elasticity, reducing stress
Data Source
AI summary
A stretchable display device is provided. The display device includes a stretchable display panel, a flexible printed circuit board connected to the stretchable display panel, and a connecting circuit connecting the stretchable display panel and the flexible printed circuit board. The flexible printed circuit board includes a non-deformation region and a deformation region outside the non-deformation region. The flexible printed circuit board further includes a stretchable base substrate, a circuit component on the base substrate, and a compensating layer on the base substrate. The compensating layer is locally disposed in the non-deformation region and the circuit component is locally disposed in the non-deformation region.