Nanobead Stress Control Layer for Flexible OLED Displays
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Solution Overview
Problem
Organic light emitting diode displays experience screen errors due to asymmetrical strain caused by tension and compression stresses when bent, resulting from their layered structure and external factors like moisture and UV rays, which existing packaging techniques fail to adequately address.
Innovation Solution
A display device with a protection film featuring a stress control layer containing nanobeads, which are mixed with UV epoxy-based or acrylate-based materials, and a support film, allowing for control of the elastic coefficient and neutral plane positioning to mitigate bending stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the organic light emitting diode display is bent to achieve thin and flexible design, then flexibility and thinness are improved, but asymmetrical strain occurs causing screen errors
Solution Approach 1:
The patent changes the physical parameters of the protection film by incorporating nanobeads with specific elastic coefficients. This modifies the film's mechanical properties to control stress distribution during bending, allowing the display to maintain image quality while achieving flexibility. The nanobeads' elastic coefficient is specifically selected to balance tension and compression stresses.
Solution Approach 2:
The protection film is constructed as a composite material combining nanobeads (metal oxide particles) with a polymer matrix. This composite structure provides both flexibility and controlled mechanical properties, enabling the film to accommodate bending while maintaining dimensional stability and preventing screen errors through balanced stress distribution.
2Reliability
If packaging techniques are used to seal the organic light emitting diode against moisture and oxygen, then reliability is improved, but device complexity increases
Solution Approach 1:
The protection film serves multiple functions simultaneously: it provides mechanical protection against bending stresses, acts as a barrier against moisture and oxygen, and maintains the structural integrity of the organic light emitting diode. This multi-functionality reduces the need for separate packaging components, thereby simplifying the overall device structure while improving reliability.
Solution Approach 2:
The patent uses a flexible protection film that combines barrier properties with mechanical flexibility. This thin film structure provides effective sealing against environmental factors while accommodating the bending requirements of flexible displays, eliminating the need for rigid packaging structures and reducing device complexity.
3Strength
If the protection film has high elastic coefficient to reduce bending stress, then stress resistance is improved, but flexibility is reduced
Solution Approach 1:
The patent precisely controls the elastic coefficient parameter of the protection film by adjusting the type and concentration of nanobeads in the composite material. This parameter optimization allows the film to achieve the minimum required stress resistance while maintaining sufficient flexibility for bending applications, resolving the trade-off between strength and adaptability.
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 reduces bending stress and maintains flexibility by controlling the neutral plane position, preventing screen errors in bent organic light emitting diode displays.
Implementation Method 1
An elastic coefficient of the stress control layer may be varied according to an amount of the nanobeads in the stress control layer
Data Source
AI summary
A display device includes a display panel configured to display an image, and a protection film coupled to a lower portion of the display panel. The protection film includes a support film contacting the display panel and a stress control layer below the support film, and the stress control layer includes a plurality of nanobeads.