Dual Panel OLED Design for High Aperture Ratio
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Solution Overview
Problem
The production yield of organic electroluminescent devices (OLEDs) is limited by the low yield of the organic electroluminescent diode, and top emission type OLEDs suffer from reduced transmittance and optical efficiency due to limited material selection, while bottom emission type OLEDs have low aperture ratios, making them ineffective for high-resolution devices.
Innovation Solution
A dual panel type OLED design where the array element layer with thin film transistors and the organic electroluminescent diode are formed on separate substrates, with a connection electrode and an absorbent layer to improve production yield and aperture ratio, and a method of fabrication that includes forming spacers and absorbent layers to prevent panel sagging and enhance moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If top emission type OLED design is used, then aperture ratio is improved, but transmittance and optical efficiency are reduced
Solution Approach 1:
The device is divided into two separate substrates: first substrate containing array element layer with TFTs, and second substrate containing organic electroluminescent diode. This segmentation allows independent optimization of each substrate's properties, enabling top emission design with high aperture ratio while managing optical efficiency through separate layer design
Solution Approach 2:
The invention transitions from single-substrate to dual-substrate architecture, adding a spatial dimension (separation of array and diode layers onto different substrates). This dimensional change enables top emission configuration where light exits through the second substrate, achieving high aperture ratio without compromising overall device performance
2Illumination intensity
If bottom emission type OLED design is used, then transmittance is improved, but aperture ratio is reduced
Solution Approach 1:
Instead of using bottom emission design, the invention inverts the emission direction to top emission configuration. The organic electroluminescent diode is configured to emit light through the second substrate, reversing the traditional bottom emission approach and achieving high aperture ratio while maintaining optical efficiency through the dual-substrate architecture
3Device complexity
If array element layer and organic electroluminescent diode are formed on the same substrate, then device complexity is reduced, but production yield is limited by low diode yield
Solution Approach 1:
The fabrication process is segmented into two independent substrate processing lines: first substrate for array element layer and second substrate for organic electroluminescent diode. This segmentation allows separate optimization and quality control of each component, improving overall production yield by preventing defect propagation while maintaining relatively simple individual fabrication processes
Solution Approach 2:
The array element layer and organic electroluminescent diode are prepared separately on their respective substrates before final assembly. This preliminary action on separate substrates allows quality verification and optimization of each component independently, improving production yield by identifying and correcting defects early in the fabrication process
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 increases the production yield and aperture ratio of OLEDs, allowing for high-resolution and long-lasting top emission type devices with improved optical efficiency and moisture protection without additional packaging processes.
Implementation Method 1
an absorbent layer on an inner surface of the second substrate in the second region
Data Source
AI summary
An organic electroluminescent device includes first and second substrates facing each other and spaced apart from each other, each of the first and second substrates having a first region and a second region in a periphery of the first region; an array element on an inner surface of the first substrate, the array element having a thin film transistor; an organic electroluminescent diode on an inner surface of the second substrate in the first region; a connection electrode between the first and second substrates in the first region, the connection electrode connecting the first and second substrates electrically; a spacer on an inner surface of the first substrate in the second region, the spacer having a thickness corresponding to a height of the connection electrode; an absorbent layer on an inner surface of the second substrate in the second region; and a seal pattern attaching the first and second substrates, the seal pattern outside of the absorbent layer, wherein first laminate layers including the organic electroluminescent diode of the second substrate in the first region have a thickness substantially equal to a thickness of second laminate layers including the absorbent layer of the second substrate in the second region.