Foldable Display Bonding Structure for Wrinkle-Free Flatness
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Solution Overview
Problem
Flexible display devices face issues with maintaining uniform flatness when repeatedly folded and unfolded, leading to physical deformation and wrinkles due to varying elastic moduli of optically clear bonding members.
Innovation Solution
A display device design featuring bonding members with distinct elastic moduli in different regions, where the elastic modulus is higher in the folding region and lower in non-folding regions, preventing physical deformation and wrinkles by allowing smooth relative movement and high elastic modulus in the folding region for stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optically clear bonding members with uniform elastic modulus are used to connect display panel and window, then manufacturing is simple, but physical deformation and wrinkles occur during repeated folding and unfolding
Solution Approach 1:
The bonding member is designed with different elastic moduli in different regions: a first region with a first elastic modulus and a second region with a second elastic modulus. This local differentiation allows the bonding member to have optimal mechanical properties in each region, preventing physical deformation and wrinkles during repeated folding and unfolding while maintaining overall structural integrity.
Solution Approach 2:
The bonding member is divided into multiple regions (first region and second region) with distinct elastic moduli. This segmentation allows each region to independently respond to mechanical stresses during folding and unfolding, preventing uniform stress distribution that leads to deformation and wrinkles.
2Strength
If bonding member has high elastic modulus throughout, then structural strength is maintained, but relative movement between elements is restricted causing deformation
Solution Approach 1:
The bonding member has a first region with a first elastic modulus that allows relative movement between display panel and window, and a second region with a second elastic modulus that provides structural strength. This local differentiation enables both movement capability and strength to coexist without compromising either function.
Solution Approach 2:
By dividing the bonding member into regions with different elastic moduli, the patent enables specific regions to provide movement capability while other regions maintain structural integrity, resolving the contradiction between strength and operational flexibility.
3Adaptability or versatility
If elements are folded and unfolded repeatedly, then flexibility and adaptability are improved, but flatness uniformity deteriorates due to physical deformation
Solution Approach 1:
The bonding member is designed with different elastic moduli in different regions to specifically address the mechanical stresses encountered during folding and unfolding. The first region with its elastic modulus allows flexible movement during folding, while the second region maintains flatness uniformity, enabling repeated folding operations without deformation.
Solution Approach 2:
By segmenting the bonding member into regions with different mechanical properties, the patent enables the structure to accommodate folding movements while preventing the propagation of deformations that would compromise flatness uniformity across the entire display device.
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 design ensures uniform flatness and prevents physical deformation and wrinkles by optimizing elastic moduli distribution across the display device, enhancing its durability and functionality during repeated folding and unfolding.
Implementation Method 1
The bonding member may comprise a first bonding part having a first elastic modulus and disposed in the first region, a second bonding part having a second elastic modulus and disposed in the second region, and a third bonding part having a third elastic modulus and disposed in the third region. The first elastic modulus may be greater than each of the second elastic modulus and the third elastic modulus.
Data Source
AI summary
A display device includes a first region, a second region adjacent to a side of the first region, and a third region adjacent to another side of the first region; a display panel in the first region, the second region and the third region; a window on and overlapping the display panel; and a bonding member between the display panel and the window and in the first region, the second region and the third region. The bonding member includes a first bonding part having a first elastic modulus and in the first region, a second bonding part having a second elastic modulus and in the second region, and a third bonding part having a third elastic modulus and in the third region. The first elastic modulus is greater than each of the second elastic modulus and the third elastic modulus.