Foldable Display Panel Deformation Layer for Stress Detection
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Solution Overview
Problem
Foldable display panels face challenges in detecting deformation and cracking defects during manufacturing, leading to reduced yield due to undetected stress and potential fractures between layers.
Innovation Solution
Incorporating a deformation layer with a force-strained material, such as a photoinitiator, fluorescent, or phosphorescent material, that changes luminous color and brightness when irradiated with ultraviolet light, allowing for the detection of deformation degrees and cracking defects in the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a foldable display panel is bent during manufacturing, then the panel achieves its foldable function, but stress is generated causing separation or fracture between layers
Solution Approach 1:
The patent applies preliminary action by incorporating a deformation layer with force-strained material before the bending process. This layer pre-detects stress distribution and cracking tendencies during manufacturing, allowing preventive measures to be taken before actual layer separation or fracture occurs, thus maintaining layer adhesion while achieving foldability
2Productivity
If defective display panels are mass-produced without detection, then production efficiency is maintained, but yield is reduced due to undetected cracks and defects
Solution Approach 1:
The deformation layer performs preliminary detection of cracks and defects during the manufacturing process itself, before mass production is completed. This allows defective panels to be identified and removed early, preventing them from entering mass production and thus maintaining both production efficiency and product yield
Solution Approach 2:
The force-strained material in the deformation layer acts as an intermediary that translates internal stress and cracking into visible luminous changes. This mediator enables indirect detection of defects that would otherwise be invisible, allowing quality control without disrupting the mass production flow
3Measurement precision
If the deformation layer uses force-strained material to detect stress, then defect detection capability is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the deformation layer with existing structural elements of the display panel, integrating the detection function into the non-active area without adding separate detection devices. The force-strained material is incorporated into layers such as the planarization layer, pixel definition layer, spacer layer, or protective layer, thus improving defect detection while minimizing structural complexity
Solution Approach 2:
The deformation layer serves multiple functions: it maintains the structural integrity of the display panel, provides stress distribution, and enables defect detection through luminous changes. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while achieving precise defect detection
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
Enables effective visualization of stress and detection of defects in the display panel, preventing the mass-production of defective panels and improving yield by using UV light to differentiate deformation levels through color and brightness changes.
Implementation Method 1
a force-strained material configured to detect a degree of deformation and a cracking defect of the display panel according to a luminous color and brightness of the force-strained material
Implementation Method 2
the force-strained material comprises any one of a photoinitiator material, a fluorescent material, or a phosphorescent material
Data Source
AI summary
A foldable display panel, including an active area and a non-active area disposed around the active area, and a deformation layer disposed in the non-active area of the display panel. A material of the deformation layer includes a force-strained material configured to detect a degree of deformation and a cracking defect of the display panel according to a luminous color and brightness of the force-strained material.