Organic Light Emitting Display Device Crack Prevention and Detection
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Solution Overview
Problem
Flexible organic light emitting display devices are prone to cracks from external forces, which can lead to moisture and oxygen penetration, causing oxidation of elements and reducing the reliability of the device.
Innovation Solution
The organic light emitting display device incorporates a crack prevention layer in the non-active area adjacent to the active area, along with crack detection lines that measure output resistance values to determine if cracks have formed, thereby preventing damage to the active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible organic light emitting display device is made flexible to reduce weight and volume, then adaptability is improved, but cracks are easily generated by external force during movement or handling
Solution Approach 1:
The patent introduces a crack prevention layer that segments the stress distribution across the flexible display device. This layer is positioned between the active area and the peripheral area, creating a structural division that prevents crack propagation from the flexible peripheral regions into the sensitive active display areas during bending or external force application.
Solution Approach 2:
The crack prevention layer acts as an intermediary structural element between the flexible peripheral areas and the active display areas. This intermediate layer absorbs and distributes mechanical stress, preventing direct transmission of cracks to the active area while maintaining the overall flexibility of the device.
2Ease of operation
If cracks are present in the flexible display device, then ease of operation is maintained, but external moisture or oxygen penetrates through cracks causing oxidation of elements and reducing reliability
Solution Approach 1:
The crack prevention layer is incorporated into the device structure during manufacturing, providing preliminary protection against crack formation and propagation. This pre-established protective barrier ensures that even when the flexible display is subjected to external forces during operation, cracks cannot penetrate through to expose internal elements to moisture and oxygen.
Solution Approach 2:
The crack prevention layer serves as an intermediary protective barrier between the external environment and the internal elements of the display device. It blocks the penetration path for moisture and oxygen that would otherwise travel through cracks caused by flexible handling or external forces.
3Reliability
If crack detection lines are added to measure output resistance values, then reliability is improved by detecting cracks before they affect the active area, but device complexity increases
Solution Approach 1:
The crack detection lines utilize the existing conductive pathways and measurement infrastructure within the display device. By integrating crack detection into the existing circuit architecture and using available measurement systems, the patent achieves reliable crack detection without adding separate complex detection systems, thus minimizing the increase in device complexity.
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 effectively enhances the reliability of the organic light emitting display device by preventing crack propagation to the active area, thus avoiding moisture and oxygen penetration and maintaining the integrity of the device.
Implementation Method 1
The at least one crack detection element may be utilized to determine whether or not a crack is generated through measuring an output resistance value of the at least one crack detection line
Data Source
AI summary
Disclosed is an organic light emitting display device which may improve reliability. The organic light emitting display device includes light emitting elements arranged in an active area, crack prevention layers arranged in a non-active area along the perimeter of the active area, and at least one crack detection line arranged between the active area and the crack prevention layers, and judges whether or not a crack is generated through an output resistance value from the at least one crack detection line and may thus raise yield.