OLED Resonance Structure with Common Green Layer
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Solution Overview
Problem
Current display manufacturing methods are costly and inefficient, particularly in achieving optimal resonance distances for red, green, and blue light-emitting layers, which affects the quality and cost of the final display device.
Innovation Solution
A display device structure and manufacturing method that includes specific resonance distances for red, green, and blue light-emitting layers, with a green light-emitting layer as a common layer and an auxiliary layer adjusting the gap between the blue light-emitting layer and the anode, and electron block layers to prevent green light emission, allowing for primary resonance of red and green light and secondary resonance of blue light, reducing material thickness and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate light-emitting layers are formed for red, green, and blue pixels using conventional methods, then each pixel can emit its designated color, but the manufacturing process becomes complex and costly with multiple deposition steps and masks
Solution Approach 1:
The green light-emitting layer serves multiple functions: it emits green light in green pixels and simultaneously acts as an electron transport layer in red and blue pixels. This multi-functionality reduces the number of separate layers needed, simplifying the manufacturing process while maintaining precise control over each pixel's light-emitting properties
Solution Approach 2:
The patent merges the green light-emitting layer with the electron transport function in red and blue pixels. By combining these functions into a single layer, the number of deposition steps and masks is reduced, making the manufacturing process simpler while maintaining the precision needed for each pixel to emit its designated color
2Reliability
If optimal resonance distances are achieved for all three colors, then light emission quality is maximized, but the device structure becomes more complex with different gap requirements for red, green, and blue pixels
Solution Approach 1:
The patent applies local quality by creating different gap structures in different pixel regions. The auxiliary layer is selectively positioned to create larger gaps in red and blue pixels while maintaining smaller gaps in green pixels, allowing each pixel type to achieve its optimal resonance distance for maximum light emission quality without requiring a completely different structure for each color
Solution Approach 2:
The patent segments the pixel structure into different regions with different gap requirements. By dividing the display into red, green, and blue pixel regions with customized gap structures, each segment can be optimized for its specific color's resonance requirements, maintaining high light emission quality while managing overall device complexity through modular design
3Ease of manufacture
If material thickness is reduced to lower costs, then manufacturing expenses decrease, but achieving optimal resonance distances and light emission quality becomes more difficult
Solution Approach 1:
The patent introduces adjustable auxiliary layers that can be tuned to achieve optimal resonance distances even with reduced material thickness. These auxiliary layers provide dynamic adjustment capability, allowing the resonance characteristics to be optimized for each pixel type while maintaining thinner overall structures that reduce material costs
Solution Approach 2:
The auxiliary layer acts as an intermediary element that mediates between the reduced material thickness and the required resonance distance. By introducing this intermediate layer with adjustable properties, the system can achieve the necessary optical path length for resonance while keeping the overall device thinner and using less material, thus reducing costs without sacrificing precision
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 approach results in a high-quality display device with reduced material consumption and manufacturing costs, achieving efficient light resonance and improved color purity by optimizing the structure and process for red, green, and blue light-emitting layers.
Implementation Method 1
When the excitons are changed from an excited state to a ground state, fluorescent molecules in the light emitting layer emit light to form an image
Implementation Method 2
the anode and the cathode may be configured such that each of the red light, and the blue light, and the green light resonates between the anode and the cathode
Data Source
AI summary
A display device includes a substrate having a red pixel region, a blue pixel region, and a green pixel region. An anode is on the substrate, a light-emitting layer is on the anode, and a cathode is on the light-emitting layer, wherein the light-emitting layer includes a red light-emitting layer emitting red light on the red pixel region, a blue light-emitting layer emitting blue light on the blue pixel region, and a green light-emitting layer emitting green light on the red pixel region, the blue pixel region, and the green pixel region. Each of the red light, the blue light, and the green light is resonated between the anode and the cathode.