Magnetic Adhesion for Flexible Display Substrate Alignment
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Solution Overview
Problem
Flexible display devices face challenges in maintaining their bent shape due to misalignment of support members, leading to decreased yield rates and reliability issues, as cracks form when trying to correct adhered positions.
Innovation Solution
The use of a magnet sheet and a metal sheet facing each other, with a support member in between, to hold the substrate in a bent state, allowing for accurate alignment and separation without applying force, preventing cracks and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a support member is provided between a bent flexible substrate to maintain curvature, then the bent shape is maintained, but misalignment of support members causes cracks and decreases yield rates
Solution Approach 1:
A magnetic field is introduced as an intermediary force between the support member and the flexible substrate. The support member has magnetic properties and magnetically attracts the flexible substrate to maintain the bent shape, replacing direct mechanical contact and adhesion with magnetic attraction, which allows for misalignment without causing cracks
Solution Approach 2:
The mechanical adhesion system (adhesion layer directly bonding support member to substrate) is replaced with a magnetic field-based attraction system. This substitution eliminates the need for precise mechanical alignment and adhesion, as the magnetic field can accommodate misalignment while maintaining the bent shape
2Stability of the object's composition
If adhesion layer is used to fix control layer to flexible substrate, then curvature is maintained, but misaligned adhered positions cause cracks when trying to correct
Solution Approach 1:
The magnetic field serves as an intermediary that maintains the bent shape without requiring direct adhesion between the support member and substrate. This eliminates the adhesion layer's alignment constraints and prevents cracks from forming when misalignment occurs
Solution Approach 2:
The mechanical adhesion system is replaced with magnetic attraction. The support member with magnetic properties attracts the flexible substrate magnetically, maintaining curvature stability without the reliability issues of adhesion-based systems that crack under misalignment stress
3Area of stationary object
If frame portion is made narrow to make display device smaller, then device size is reduced, but maintaining bent shape becomes more difficult
Solution Approach 1:
The magnetic field acts as a distributed intermediary force across the narrow frame portion, providing uniform attraction between the support member and substrate. This magnetic attraction maintains the bent shape effectively even in narrow frame areas where mechanical adhesion would be insufficient
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
This solution effectively maintains the bent shape of the substrate, enhances manufacturing yield rates, and improves the reliability of the display device by preventing cracks in weak regions, even with misaligned adhered positions.
Implementation Method 1
a magnet sheet in contact with the first protection film, and a metal sheet in contact with the second protection film. The magnet sheet and the metal sheet face each other by bending the substrate between the display region and the terminal portion, and the magnet sheet and the metal sheet adhere to each other to hold the substrate in a bent state
Implementation Method 2
a first metal sheet overlapping the terminal portion on the second side of the substrate, a second metal sheet between the first protection film and the first metal sheet on the second side of the substrate, and a support member having magnetic properties. The first metal sheet and the second metal sheet face each other by bending the substrate between the display region and the terminal portion, the support member is between the first metal sheet and the second metal sheet, and the first metal sheet and the second metal sheet are adhered to the support member to hold the substrate in a bent state
Data Source
AI summary
A display device includes a bendable substrate having a first side and a second side, a display region above the first side of the substrate, a terminal portion above the first side of the substrate, a first protection film overlapping the display region on the second side of the substrate, a second protection film overlapping the terminal portion on the second side of the substrate, a magnet sheet in contact with the first protection film, and a metal sheet in contact with the second protection film, by bending the substrate in between the display region and the terminal portion, the magnet sheet and the metal sheet face each other, and the magnet sheet and the metal sheet adhere to each other to hold the substrate in a bent state.