Flexible Display Connection Electrode Elastic Modulus
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Solution Overview
Problem
Flexible display panels are vulnerable to external impacts and stress, such as folding, which can damage transistors and affect pixel operation, leading to reliability issues.
Innovation Solution
A display panel design featuring a pixel circuit with a semiconductor pattern layer, a data line, and a connection electrode made of metal material, where the connection electrode has a lower elastic modulus than the semiconductor pattern layer, providing improved impact resistance and stress relief through a buffer layer and insulation layers, and is electrically connected to a light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible display panel is designed to be deformable and portable, then ease of carrying and user convenience are improved, but vulnerability to external impact and stress increases
Solution Approach 1:
The patent changes the elastic modulus parameter of the connection electrode to be lower than that of the semiconductor pattern layer. This parameter change allows the connection electrode to deform more easily under external impact, absorbing stress and preventing damage to the semiconductor patterns and light emitting elements, thus resolving the contradiction between flexibility and impact resistance
Solution Approach 2:
The connection electrode acts as an intermediary element between the semiconductor pattern layers and the external environment. By positioning it in the upper or lower portion of the semiconductor pattern layer and using material with lower elastic modulus, it serves as a stress-absorbing mediator that protects the sensitive internal components from external impacts while maintaining electrical connectivity
2Reliability
If the connection electrode is made of metal material with lower elastic modulus, then impact resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by using metal material with lower elastic modulus specifically for the connection electrode portion that requires impact absorption, while other parts of the display panel maintain their original material properties. This localized application of special material properties provides impact resistance without requiring complete redesign of the entire device structure
Solution Approach 2:
The connection electrode is segmented into distinct portions (first connection electrode portion and second connection electrode portion) that can be independently formed and positioned in the upper or lower portions of the semiconductor pattern layer. This segmentation allows for flexible manufacturing and assembly while maintaining the overall structural integrity and electrical functionality
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
Enhances the display panel's resistance to external impacts and stress, preventing transistor damage and ensuring reliable operation even when subjected to deformation or bending.
Implementation Method 1
a connection electrode electrically connecting the other end of the first semiconductor pattern and the other end of the second semiconductor pattern, and including a metal material. The connection electrode is disposed in an upper portion or a lower portion of the semiconductor pattern layer
Data Source
AI summary
A display panel includes a light emitting element, and a pixel circuit electrically connected to the light emitting element. The pixel circuit includes a semiconductor pattern layer defining a first semiconductor pattern electrically connected to the light emitting element, and a second semiconductor pattern which is spaced apart from the first semiconductor pattern, a data line on the semiconductor pattern layer and electrically connected to the second semiconductor pattern, and a connection electrode electrically connecting the first semiconductor pattern and the second semiconductor pattern which are spaced apart from each other, to each other. Along a thickness direction of the display panel, the connection electrode is a portion of a metal layer below the semiconductor pattern layer or a portion of a metal layer above the semiconductor pattern layer.