Flexible Display Substrate Bending Section Control
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Solution Overview
Problem
Flexible display devices face reliability issues due to bending stress on elements like transistors and organic EL elements when curved, and accurately controlling the bending section is challenging, complicating manufacturing processes.
Innovation Solution
A display device with a flexible substrate featuring an adjustment region between the pixel and terminal sections, where the Young's modulus differs from the pixel and frame regions, allowing for precise control of the bending section and reducing stress on critical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display is bent to improve portability and storability, then the display device becomes more portable and storable, but bending stress is exerted on elements such as transistors and organic EL elements, resulting in reduced reliability
Solution Approach 1:
The patent applies local quality by creating a bending section with specifically adjusted physical properties (different Young's modulus) compared to other regions. This allows the bending section to flex while other regions maintain structural integrity, thereby enabling portability without subjecting critical elements to damaging stress.
Solution Approach 2:
The substrate is segmented into distinct functional regions: a pixel region, a frame region, and a bending section. This segmentation allows each region to serve its specific purpose - the bending section absorbs mechanical stress during folding while the pixel and frame regions maintain their structural and functional integrity.
2Reliability
If the neutral plane is arranged in the vicinity of the organic semiconductor element layer to reduce bending stress, then stress on elements is reduced, but the position of the bending section becomes difficult to accurately control, leading to unstable product shape
Solution Approach 1:
The patent changes the physical parameters of the bending section by adjusting the Young's modulus to be different from other regions. This parameter change enables precise control over where the bending occurs, allowing accurate positioning of the bending section while maintaining stress reduction benefits.
Solution Approach 2:
By giving the bending section distinct physical properties (different Young's modulus), the patent creates a region with localized characteristics that determine where bending will occur. This local quality differentiation enables precise control of the bending section position while maintaining the protective neutral plane arrangement.
3Adaptability or versatility
If a flexible coating layer is added as a constituent factor to enable bending, then the display can be curved and folded, but manufacturing processes become more complicated
Solution Approach 1:
Instead of making the entire substrate flexible through additional coating layers, the patent segments the substrate into a rigid main body and a flexible bending section. This segmentation achieves the required flexibility for curving and folding while minimizing the addition of complex manufacturing processes, as only the bending section requires special treatment.
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 stabilizes the product shape, enhances reliability by minimizing bending stress on transistors and organic EL elements, and simplifies manufacturing by allowing accurate positioning of the bending section, thereby improving the overall performance and portability of flexible displays.
Implementation Method 1
the adjustment region having a different Young's modulus from those of the pixel region and the frame region
Data Source
AI summary
Disclosed is a display device, including a first substrate having flexibility including a pixel region and a frame region around the pixel region, a pixel arranged on a first surface of the first substrate in the pixel region, and a terminal section arranged in the frame region and connected to the pixel, in which the first substrate includes an adjustment region between the pixel and the terminal section, the adjustment region having a different Young's modulus from those of the pixel region and the frame region.