Flexible OLED Lower Passivation Film Stress Adjustment Patterns
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Solution Overview
Problem
The challenge in manufacturing flexible organic light emitting diode (OLED) displays is the increased stress and asymmetry of strains when the thickness is increased due to additional films, leading to picture abnormalities and difficulties in positioning the organic light emitting element in the neutral plane, especially when bending occurs.
Innovation Solution
An organic light emitting diode display with a lower passivation film containing a polymer resin and an antistatic agent, featuring stress adjustment patterns that minimize bending stress by adjusting the interval between stress adjustment patterns, and incorporating inorganic fiber materials to enhance mechanical strength and flexibility, thereby reducing stress and preventing static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional internal and external films such as polarizing film and passivation film are attached to increase thickness, then protection and functionality are improved, but tensile stress and compressive stress are increased and the neutral plane becomes narrow making it difficult to position the organic light emitting element
Solution Approach 1:
The patent applies local quality by creating a neutral plane positioning structure that specifically addresses the stress distribution at the bending portion. The organic light emitting element is positioned at a predetermined location in the neutral plane where stress is minimized, while other regions can have different structural characteristics. This allows the element to be protected by additional films without suffering from increased stress, as the neutral plane positioning locally compensates for the stress effects.
2Reliability
If additional films are attached to increase thickness, then protection is improved, but asymmetry of strains occur due to difference in tensile stress and compressive stress leading to picture abnormality
Solution Approach 1:
The patent applies local quality by creating a neutral plane positioning structure that specifically addresses the stress distribution at the bending portion. The organic light emitting element is positioned at a predetermined location in the neutral plane where stress is minimized, while other regions can have different structural characteristics. This allows the element to be protected by additional films without suffering from increased stress, as the neutral plane positioning locally compensates for the stress effects.
3Adaptability or versatility
If the display is made thin and flexible for various applications, then adaptability is improved, but stress occurs during bending making it difficult to position the organic light emitting element in the neutral plane
Solution Approach 1:
The patent applies local quality by creating a neutral plane positioning structure that specifically addresses the stress distribution at the bending portion. The organic light emitting element is positioned at a predetermined location in the neutral plane where stress is minimized, while other regions can have different structural characteristics. This allows the element to be protected by additional films without suffering from increased stress, as the neutral plane positioning locally compensates for the stress effects.
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 stress and asymmetry of strains in the bending portions of the OLED display, preventing picture abnormalities and static electricity, while maintaining flexibility and mechanical strength, and reducing defects during the manufacturing process.
Implementation Method 1
a lower passivation film attached to a bottom of the organic light emitting panel and including a polymer resin and an antistatic agent
Implementation Method 2
The lower passivation film may further include an inorganic fiber material
Implementation Method 3
the lower passivation film includes a plurality of stress adjustment patterns disposed to be adjacent to each other
Data Source
AI summary
A organic light emitting diode display including an organic light emitting display panel displaying an image, and a lower passivation film attached to a bottom of the organic light emitting panel and including a polymer resin and an antistatic agent, wherein the lower passivation film includes a plurality of stress adjustment patterns disposed to be adjacent to each other wherein decreasing the bending interval between the bending stress adjustment patterns formed at the lower passivation film processed with the antistatic agent and attached at the position corresponding to the bending portion of the organic light emitting panel, thereby selectively minimizes the stress of the bending portion of the organic light emitting panel, therefore, asymmetry of strains of the bending portions of the organic light emitting display panel can be prevented to remove a picture abnormality, and static electricity may be prevented.