OLED Packaging Protruded Frames Gas Barrier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED devices are vulnerable to water vapor and oxygen gas, leading to reduced lifespan, and existing packaging methods either allow gas permeation or damage the OLED layer, especially when manufacturing large-size displays or narrow bezel panels.
Innovation Solution
A packaging structure with at least three rows of protruded frames and alternating packaging materials, including desiccant and UV/thermal curing resin adhesive, is used to create a barrier around OLED devices, extending the gas invasion path and preventing water vapor and oxygen ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resin adhesive is used to package OLED devices, then the packaging process is simple, but water vapor and oxygen gas permeate into the OLED devices
Solution Approach 1:
The patent uses a composite packaging structure combining resin adhesive with glass cement and protruded frames. The glass cement provides superior barrier properties against water vapor and oxygen gas permeation, while the resin adhesive maintains ease of application. This composite approach resolves the contradiction by achieving both manufacturing simplicity and reliable protection.
Solution Approach 2:
The packaging structure is segmented into multiple functional components: protruded frames that create physical barriers, glass cement filling the gaps for hermetic sealing, and resin adhesive for bonding. This segmentation allows each component to specialize in specific protection functions, achieving comprehensive protection while maintaining manufacturing feasibility.
2Reliability
If the distance from the outer edge of the adhesive to OLED is increased to improve prevention effect, then water vapor and oxygen gas prevention is improved, but the area of non-luminous region increases
Solution Approach 1:
The patent transitions from a two-dimensional planar adhesive layer to a three-dimensional structure with protruded frames extending vertically. This dimensional change allows the packaging to provide enhanced protection through vertical barrier structures while minimizing the horizontal footprint, thus preventing gas permeation without significantly increasing the non-luminous region area.
Solution Approach 2:
The protruded frames act as thin film-like barrier structures that provide effective protection against water vapor and oxygen gas permeation. These frames create a tortuous path for gas molecules, enhancing protection efficiency per unit area, thereby improving reliability without proportionally increasing the non-luminous region.
3Reliability
If glass cement is used to package OLED devices, then excellent packaging effect is achieved, but laser is needed during curing which may damage the OLED layer
Solution Approach 1:
The patent extracts the laser curing step from the glass cement application process. Instead of using laser to cure the glass cement, the invention allows the glass cement to cure naturally or through alternative methods that do not require laser exposure, thereby eliminating the harmful laser effect on the OLED layer while maintaining the excellent packaging effect of glass cement.
4Reliability
If only glass cement is used to package OLED devices, then excellent packaging effect is achieved, but manufacture of large-size OLED devices cannot be achieved because glass plate would collapse
Solution Approach 1:
The patent creates a composite packaging system where glass cement provides hermetic sealing and protruded frames provide structural support. This composite structure distributes the weight and stress of large-size OLED devices across the rigid frames, preventing glass plate collapse while maintaining the excellent packaging effect of glass cement, thus enabling manufacture of large-size displays.
Solution Approach 2:
The packaging structure is segmented into protruded frames that provide mechanical support and glass cement that provides sealing. This segmentation allows the frames to bear the structural load of large-size devices while the glass cement focuses on providing the hermetic barrier, resolving the contradiction between packaging effectiveness and manufacturability of large-size OLEDs.
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 prolongs the lifespan of OLED devices by preventing gas ingress while maintaining a narrow bezel design and avoiding damage to the OLED layer, enabling efficient manufacturing of large-size displays.
Implementation Method 1
a first packaging material which is located between adjacent protruded frames
Implementation Method 2
UV curing and/or thermal curing resin adhesive
Implementation Method 3
UV curing and/or thermal curing resin adhesive
Implementation Method 4
prolong an invasion path of the water vapor and oxygen gas and to increase an effect of preventing the water vapor and oxygen gas
Data Source
AI summary
A light emitting display panel includes a cover plate and a substrate disposed opposite to each other; a plurality of light emitting devices located between the cover plate and the substrate; and a packaging structure surrounding the plurality of light emitting devices. The packaging structure includes at least three rows of protruded frames and a first packaging material which is located between adjacent protruded frames, each of the protruded frames having four sides which are looped and the at least three rows of protruded frames being adjacent to and embedded into each other in an outward direction. The packaging structure further includes a third packaging material which is located between the cover plate and the substrate, and located outside the outermost one of the at least three rows of protruded frames and inside the innermost one of the at least three rows of protruded frames.