Shape Memory Signal Lines for Deformable Display Substrates
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Solution Overview
Problem
Stretchable display panels face issues with conductive wires breaking during stretching or failing to return to their original shape, affecting normal display functionality.
Innovation Solution
A display substrate with a signal line made of shape memory material, connected to a control unit that detects deformation and applies corresponding excitation conditions, ensuring the signal line adapts to base deformation without breaking, using magnetostrictive materials and a piezoelectric sensing and magnetic field generation system to manage stress and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional conductive wires (copper, titanium, aluminum, etc.) are used in stretchable display panels, then the wiring can be made with standard materials and processes, but the conductive wires break during stretching or fail to return to their original shape
Solution Approach 1:
The patent changes the material parameter of the signal line from traditional conductive materials to shape memory materials, which have the ability to change their physical state (deformation characteristics) in response to external stimuli. This allows the signal line to adapt to deformation while maintaining structural integrity and electrical conductivity.
Solution Approach 2:
The patent employs composite material structures, particularly using shape memory alloys or shape memory polymers that combine conductive properties with shape memory capabilities. This composite approach enables the signal line to both conduct electricity and undergo reversible deformation without breaking.
2Reliability
If the signal line is made rigid to maintain electrical connection, then electrical conductivity is ensured, but the display substrate cannot deform
Solution Approach 1:
The patent makes the signal line dynamic by using shape memory materials that can actively change their shape and stiffness in response to deformation stimuli. The signal line transitions from a rigid state during normal operation to a flexible state during deformation, and then returns to its original shape, maintaining electrical connection throughout the deformation cycle.
Solution Approach 2:
The signal line's physical parameters (shape, stiffness, length) are changed dynamically through shape memory material properties. When the substrate deforms, the shape memory material undergoes phase transformation or elastic deformation, changing its physical state to accommodate the deformation while maintaining electrical connectivity.
3Adaptability or versatility
If the signal line deforms with the substrate, then adaptability to deformation is improved, but the wiring may break or fail to return to original shape
Solution Approach 1:
The shape memory material in the signal line has self-service capabilities through its inherent shape memory effect. When deformed beyond its elastic limit, the material can autonomously return to its original shape when exposed to appropriate stimuli (such as temperature change, magnetic field, or electrical current), without requiring external intervention. This self-recovery mechanism ensures wiring integrity while maintaining deformation adaptability.
Solution Approach 2:
The patent incorporates a control unit that detects the deformation state of the substrate and provides feedback control to the signal line. The control unit monitors the deformation and adjusts the signal line's state (through applied fields or currents) to maintain optimal performance, ensuring the signal line deforms appropriately and returns to its original shape, preventing wire breakage.
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
Prevents wiring breakage and allows for adaptive deformation, ensuring normal display during deformation, enhancing the usability and quality of deformable display substrates.
Implementation Method 1
at least a part of the signal line is made of a shape memory material, and the part is deformed to different degrees under different excitation conditions
Implementation Method 2
the piezoelectric sensing part can sense the stress, convert the stress into a first current signal
Implementation Method 3
the magnetic field generation part can generate a magnetic field strength of a magnitude corresponding to the second current signal
Implementation Method 4
the signal line is made of a magnetostrictive shape memory material, and the magnetostrictive shape memory material has different deformation states under different magnetic field strengths
Data Source
AI summary
The present disclosure provides a display substrate and a display device. The display substrate comprises a base, a plurality of display units arranged on the base, a signal line and a control unit, wherein the signal line is configured to connect adjacent two display units of the plurality of display units; at least a part of the signal line is made of a shape memory material, and the part is deformed to different degrees under different excitation conditions; the control unit is configured to detect deformation of the base and apply a corresponding excitation condition to the signal line according to the deformation of the base, so that the signal line is in a deformation state adaptive to the deformation of the base.