Foldable AMOLED Display Using Integrated Substrate and Auxiliary Support
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Solution Overview
Problem
Current AMOLED displays face challenges in achieving true foldability due to mechanical stress and delamination issues caused by the thickness of the multi-layer lamination structure, which limits their flexibility and durability during folding and unfolding operations.
Innovation Solution
The development of an ultra-thin AMOLED display using a polyimide quarter wave retardation film as the substrate and a liquid crystal polarizer, combined with static or dynamic auxiliary supporting means, such as axle pins or rolling spacers, to minimize stress and enable +180° and −180° folding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multi-layer lamination structure is used to enhance display performance, then optical characteristics and contrast ratio are improved, but mechanical flexibility and resistance to delamination deteriorate
Solution Approach 1:
The patent merges the circular polarizer and quarter wave retarder into a single integrated layer, eliminating the OCA adhesive layer and reducing the number of interfaces where delamination can occur. This integration maintains the optical functionality while improving mechanical reliability during folding operations.
Solution Approach 2:
The patent extracts and removes the OCA (optical clear adhesive) layer from the multi-layer structure. By eliminating this adhesive layer, the design reduces the number of potential failure points and simplifies the overall structure, thereby improving resistance to delamination while maintaining display performance.
2Ease of operation
If the bending radius is reduced to achieve better foldability, then flexibility is improved, but mechanical stress and strain increase causing delamination and cracking
Solution Approach 1:
The patent employs ultra-thin film structures and flexible material designs that can accommodate small bending radii without exceeding the mechanical strength limits. The reduced thickness allows the display to bend more easily while distributing stress more evenly, preventing cracking and delamination even at tight fold angles.
Solution Approach 2:
The patent segments the display structure into multiple thin layers rather than using thick monolithic layers. This segmentation allows each layer to independently accommodate bending stress, reducing the overall mechanical strain on any single layer and preventing cracking during repeated folding operations.
3Adaptability or versatility
If the thickness of the polyimide substrate is reduced to achieve better flexibility, then bendability is improved, but mechanical strength and stress resistance deteriorate
Solution Approach 1:
The patent uses ultra-thin polyimide substrate films that provide sufficient flexibility for repeated folding while maintaining adequate mechanical strength through optimized material composition and structure. The thin film design enables small bending radii without compromising the overall durability of the 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
This solution allows for a true foldable AMOLED display with enhanced flexibility and reduced risk of delamination or cracking, enabling both one-dimensional and two-dimensional bendable displays with improved durability and optical characteristics.
Implementation Method 1
a liquid crystal polarizer
Implementation Method 2
liquid crystal polarizer
Implementation Method 3
polyimide quarter wave retardation film
Data Source
AI summary
The present invention relates to an AMOLED display, more specifically, to an AMOLED display employing an ultra-thin all-in-one substrate and an auxiliary supporting means to achieve true foldable display devices.