Foldable OLED Support Layer Openings Filled to Prevent Delamination
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Solution Overview
Problem
Flexible organic light emitting display devices face issues with delamination of adhesive and support members during repeated folding and unfolding, leading to defects such as wrinkles and foreign substance permeation through openings in the foldable areas.
Innovation Solution
Incorporating a primer coating layer on the support member, which allows the shock absorbing member to be bonded without an adhesive, filling openings and trenches with the shock absorbing member to prevent delamination and foreign substance ingress, and using metal members to prevent sagging and shield external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive member is used to bond the display panel to the support member, then the display panel can be attached to the support member, but the adhesive member and support member delaminate during repeated folding and unfolding
Solution Approach 1:
The patent removes the adhesive member from the structure entirely, replacing it with a primer coating layer that enables direct bonding between the shock absorbing member and support member. This extraction eliminates the delamination problem that occurred with adhesive members during repeated folding cycles.
Solution Approach 2:
The patent uses a composite structure consisting of the primer coating layer (containing polyisocyanate and polyol) combined with the shock absorbing member and support member. This composite material system provides both bonding strength and flexibility, allowing the assembly to withstand repeated folding without delamination.
2Adaptability or versatility
If openings are provided in the support member on the foldable area, then flexibility is improved, but foreign substances can permeate through the openings
Solution Approach 1:
The patent applies different properties to different regions: the shock absorbing member is placed locally within the openings to block foreign substances, while the primer coating layer is applied to the side walls to provide bonding. This local differentiation allows the openings to maintain both flexibility and protection against foreign substance permeation.
3Productivity
If a primer coating layer is used to bond the shock absorbing member without an adhesive, then manufacturing steps are reduced, but bonding strength may be insufficient
Solution Approach 1:
The patent changes the chemical parameters of the bonding interface by using a primer coating layer containing polyisocyanate and polyol. These chemical parameters enable strong bonding between the shock absorbing member and support member, achieving sufficient bonding strength while eliminating the need for separate adhesive application steps.
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 solution effectively prevents delamination and foreign substance permeation, maintains structural integrity, and reduces manufacturing complexity and costs by eliminating the need for adhesive replacement processes.
Implementation Method 1
a primer coating layer which allows the shock absorbing member to be bonded without an adhesive
Implementation Method 2
the shock absorbing member is disposed between the primer coating layer and the display panel
Implementation Method 3
the primer coating layer may include polyisocyanate and polyol
Data Source
AI summary
An organic light emitting display device includes a display panel, a support layer, a coating layer, and a cushion layer. The display panel includes a foldable area. The support layer is disposed on a bottom surface of the display panel, and a plurality of openings is defined through the support layer on the foldable area. The coating layer is disposed on a top surface of the support layer and side walls of the support member which define the openings. The cushion layer is disposed between the coating layer and the display panel.