Reinforcing Member in Flexible Display Non-Display Area
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Solution Overview
Problem
Display devices face challenges in minimizing the non-display area and enhancing reliability, particularly in flexible substrates where the non-display area can be significant and prone to mechanical stress when bent.
Innovation Solution
The design incorporates a flexible base layer with distinct portions for the display unit and driving circuit, utilizing conductive pads and terminals with different materials for direct contact and ultrasonic bonding, along with a reinforcing member to increase structural integrity and reduce the non-display area by forming openings in the support members for the driving circuit, allowing for efficient bonding and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a flexible substrate is used to reduce the non-display area, then the display area can be increased, but the mechanical stress and reliability issues worsen when the device is bent
Solution Approach 1:
The support member is segmented into multiple regions: a first region with a first modulus of elasticity and a second region with a second modulus of elasticity. This segmentation allows different parts of the support member to have different mechanical properties, enabling the device to bend smoothly while maintaining structural integrity and distributing mechanical stress appropriately across the flexible substrate.
Solution Approach 2:
The support member exhibits local quality variations through its multi-region structure, where each region has a specifically tailored modulus of elasticity. The first region (with higher modulus) provides structural support where needed, while the second region (with lower modulus) allows for flexibility and bending, optimizing both reliability and adaptability in different areas of the device.
2Area of stationary object
If the non-display area is minimized by bending the display device, then the display area increases, but stress concentration occurs at the bending portion
Solution Approach 1:
The support member is divided into multiple regions with different moduli of elasticity, creating a gradient structure that distributes mechanical stress during bending. This segmentation prevents stress concentration by allowing gradual transition of mechanical properties across the bending portion, protecting the flexible substrate from damage.
Solution Approach 2:
The modulus of elasticity parameter is changed across different regions of the support member. By varying this mechanical parameter spatially, the support member can accommodate bending stresses more effectively, reducing peak stress values at the bending portion while maintaining overall structural support.
3Ease of manufacture
If a uniform support member is used, then the manufacturing process is simplified, but the stress distribution during bending is uneven
Solution Approach 1:
The support member incorporates local quality variations through its multi-region structure with different moduli of elasticity. This design optimizes stress distribution during bending by providing appropriate mechanical properties at different locations, while still maintaining a relatively simple manufacturing process through techniques like selective coating or lamination.
Solution Approach 2:
The support member functions as a composite structure with multiple regions having different mechanical properties. This composite approach enables tailored stress distribution across the bending portion, combining materials or structures with different moduli of elasticity to achieve both manufacturing feasibility and optimal mechanical performance.
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 configuration reduces the non-display area, enhances the reliability of the display device by ensuring robust bonding and stress management, thereby improving mechanical durability and efficiency.
Implementation Method 1
The first pad and the first terminal are in direct contact with each other
Implementation Method 2
a first terminal disposed between the driving chip and the first pad... The first pad and the first terminal are in direct contact with each other
Data Source
AI summary
A display device includes a flexible base layer including a first portion and a second portion. A display unit is disposed on a first surface of the first portion. The display unit includes a light emitting element. A driving circuit is disposed on a first surface of the second portion. The driving circuit includes a driving chip. A first support member is disposed on a second surface of the first portion opposite the first surface. A second support member is disposed on a second surface of the second portion. The second support member includes a first opening overlapping the driving circuit. The second surface of the second portion is on an opposite side of the second portion from the first surface of the second portion. A first reinforcing member is disposed in the first opening. The first reinforcing member includes a different material from the second support member.