Dual Panel OLED With Bar-Type Desiccant for Moisture Protection
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Solution Overview
Problem
The production yield of organic electroluminescent (EL) display devices is limited by the low yield of the organic EL diode, and existing devices face challenges in achieving high resolution and high aperture ratio, especially in top emission types which suffer from reduced transmittance and optical efficiency.
Innovation Solution
A dual panel type organic EL display device is designed where the array element layer with thin film transistors and the organic EL diode are formed on separate substrates, with a bar-type desiccant in a concave portion to improve reliability, durability, and stability, and a method of fabrication that includes forming connection electrodes and attaching the substrates to ensure electrical connection and moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the array element layer and organic EL diode are formed on the same substrate, then the device structure is simpler and manufacturing is easier, but the production yield is limited by the low yield of the organic EL diode
Solution Approach 1:
The device is divided into two separate substrates: the first substrate contains the array element layer with TFTs, and the second substrate contains the organic EL diode. These substrates are manufactured independently and then bonded together, allowing each component to be optimized and manufactured separately, thereby improving overall production yield while maintaining manufacturing simplicity
Solution Approach 2:
A bonding interface is introduced as an intermediary between the array element layer and organic EL diode. This bonding interface allows the two separately manufactured substrates to be connected, enabling independent optimization of each component's manufacturing process while achieving high overall production yield
2Reliability
If a traditional packaging structure with receded portion is used for moisture protection, then the device is protected from moisture, but additional packaging structures increase device complexity
Solution Approach 1:
The encapsulation function is merged with the substrate structure itself. The substrate includes a sealing portion that directly provides moisture protection without requiring separate receded portions or additional packaging structures, thereby reducing device complexity while maintaining reliable moisture protection
Solution Approach 2:
The substrate serves multiple functions: it provides structural support, electrical connections, and moisture protection through its integrated sealing portion. This multi-functionality eliminates the need for separate packaging structures, reducing overall device complexity while ensuring reliable moisture protection
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 design enhances production yield, achieves high aperture ratio, and extends the life span of the display device by independently forming the array element and organic EL diode layers, while the bar-type desiccant ensures effective moisture protection without additional packaging, leading to improved reliability and stability.
Implementation Method 1
a bar-type desiccant in a concave portion between the first and second substrates
Data Source
AI summary
An organic electroluminescent device includes first and second substrates spaced apart from each other, the first and second substrates including a first region and a second region, the second region outside the first region and including a concave portion, an array element on an inner surface of the first substrate, the array element including a switching element, an organic electroluminescent diode on an inner surface of the second substrate, a connection electrode electrically connecting the array element and the organic electroluminescent diode, the connection electrode between the first and second substrates, and a bar-type desiccant in the concave portion of the second region between the first and second substrates.