Double-Sided OLED Encapsulation with Moisture-Absorbing Supporter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional encapsulation structures for double-sided organic light emitting devices (OLEDs) are prone to moisture intrusion and damage during assembly, especially with thicker sealing glues increasing the risk of moisture entry and reducing the aperture ratio of pixels, making them unsuitable for mass production.
Innovation Solution
A compact encapsulation structure for double-sided OLEDs is introduced, featuring a supporter with a moisture absorption layer positioned between the two OLEDs on oppositely disposed substrates, reducing direct contact with the absorption layer and using thinner sealing glues to minimize moisture permeability and prevent damage during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thicker sealing glue is used to assemble and encapsulate double-sided OLED, then the assembly is easier and more robust, but moisture intrusion increases and aperture ratio decreases
Solution Approach 1:
A supporter structure is introduced as an intermediary component between the two OLEDs. This supporter includes a moisture absorption layer that actively absorbs moisture from the internal space, and positioning protrusions that provide mechanical support and precise positioning during assembly. This mediator enables the use of thinner sealing glue while maintaining assembly robustness and preventing moisture intrusion.
Solution Approach 2:
The invention changes the thickness parameter of the sealing glue from thick (conventional) to thin (optimized). By reducing the sealing glue thickness to 5-15 μm, the aperture ratio is improved and moisture intrusion path is reduced. The supporter structure compensates for the reduced mechanical strength of thinner sealing glue through its positioning protrusions and moisture absorption layer.
2Strength
If thicker sealing glue is used for encapsulation, then assembly robustness is improved, but the aperture ratio of pixels is reduced
Solution Approach 1:
The supporter acts as a mechanical intermediary that provides structural support and positioning functionality. Its positioning protrusions engage with corresponding recesses in the substrates, providing mechanical robustness that compensates for the reduced thickness of the sealing glue. This allows the sealing glue to be thinner (improving aperture ratio) while maintaining assembly robustness through the supporter's mechanical engagement.
3Device complexity
If conventional encapsulation design is used for double-sided OLED, then assembly is simpler, but moisture damage risk increases
Solution Approach 1:
The supporter with moisture absorption layer serves as an active intermediary that chemically absorbs moisture from the internal encapsulation space. This adds a moisture resistance function without significantly increasing assembly complexity, as the supporter is integrated into the existing sandwich structure between the two OLEDs.
Solution Approach 2:
The supporter is constructed as a composite structure combining a base material (glass or plastic) with a moisture absorption layer (such as calcium oxide or other desiccants). This composite material provides both mechanical support and active moisture protection, enhancing reliability while maintaining relatively simple assembly procedures.
4Area of stationary object
If thinner sealing glue is used, then aperture ratio is improved and moisture permeability is reduced, but assembly robustness decreases
Solution Approach 1:
The supporter with positioning protrusions acts as a mechanical intermediary that compensates for the reduced robustness of thinner sealing glue. The positioning protrusions engage with recesses in the substrates, providing mechanical interlocking that enhances assembly robustness independently of the sealing glue thickness, thereby enabling the use of thinner (5-15 μm) sealing glue layers.
5Reliability
If more moisture absorption material is added to prevent moisture intrusion, then moisture resistance is improved, but device complexity and dimension increase
Solution Approach 1:
The supporter is designed as a multi-functional component that simultaneously provides mechanical support (through its rigid structure and positioning protrusions), moisture absorption (through the integrated moisture absorption layer), and positioning (through protrusion-recess engagement). By combining multiple functions in a single component, the need for separate moisture absorption materials is eliminated, preventing increases in device complexity and overall dimension.
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
The solution effectively prevents moisture damage and facilitates mass production by reducing the thickness of sealing glues and minimizing contact with the atmosphere, enhancing the encapsulation structure's strength and reducing the overall dimension of the displaying apparatus.
Implementation Method 1
a moisture absorption layer disposed on the supporter for absorbing moisture inside the encapsulation structure
Data Source
AI summary
An encapsulation structure of double sided organic light emitting device (OLED) comprises a first substrate and a second substrate disposed oppositely; a first organic light emitting device (OLED) disposed on the first substrate; a second OLED disposed on the second substrate; a supporter disposed between the first OLED and the second OLED; and at least a moisture absorption layer disposed at the supporter for absorbing moisture inside the encapsulation structure.