OLED Display Sealant Asymmetric Width Impact Resistance
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face damage and reduced impact resistance due to the fragility of substrates and sealants like frit when subjected to physical impacts, as the existing sealant designs do not effectively distribute stress and maximize pixel space.
Innovation Solution
The OLED display incorporates a sealant with a first width portion that is 1.1 to 3 times larger than a second width portion, with the larger portion closer to the edge and a curved bent section, made of frit material, to distribute impact stress and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform width sealant is used to attach and seal the first substrate and second substrate, then the sealing function is achieved, but the impact resistance is poor and stress is concentrated
Solution Approach 1:
The sealant width is designed to be non-uniform, with a first width in the first area and a second width in the second area. This local variation in geometry allows different regions of the sealant to perform different functions: the wider first area provides enhanced impact resistance and stress distribution, while the narrower second area maintains adequate sealing without unnecessary material usage.
Solution Approach 2:
The sealant structure employs asymmetric width distribution rather than a uniform symmetric design. The first width and second width are deliberately made different to optimize both sealing performance and impact resistance, with the asymmetric geometry allowing stress to be distributed more effectively during impact events.
2Strength
If the sealant width is increased to improve impact resistance, then stress distribution improves, but the pixel area is reduced
Solution Approach 1:
The sealant width is optimized locally in different areas: the first area has a larger width to provide impact resistance, while the second area has a narrower width to minimize space consumption. This localized optimization ensures that pixel area is maximized while still providing adequate impact resistance where most needed.
Solution Approach 2:
Instead of increasing the sealant width uniformly across the entire perimeter, the invention applies the wider section only in the first area where impact resistance is most critical. This partial application of excessive width provides sufficient protection without unnecessarily reducing the overall pixel area.
Data Source
AI summary
An organic light emitting diode (OLED) display device that includes: a first substrate having a first area and a second area adjacent to the first area; an organic light emitting diode (OLED) disposed on the first area of the first substrate; a second substrate facing the first substrate such that the OLED is interposed between the first substrate and the second substrate so as to expose the second area of the first substrate; and a sealant disposed between the first substrate and the second substrate to attach and seal the first substrate to the second substrate, wherein the sealant surrounds the OLED by a predetermined distance and having a first width of one portion closer to the second area that is larger than a second width of an other portion which is farther from the second area.