Electroluminescent Display Subpixel Trench and Pore Structure
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Solution Overview
Problem
Electroluminescent display devices face challenges in maintaining picture quality due to leakage currents generated between neighboring subpixels when emitting the same-colored light without a mask process, leading to potential deterioration in image quality.
Innovation Solution
The design incorporates a trench structure between subpixels with a noncontiguous emission layer and a pore below the emission layer, preventing charge transfer and leakage currents, and varying electrode distances to achieve a micro-cavity effect for improved light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the emission layer emits the same-colored light for each subpixel without the mask process, then the manufacturing complexity is reduced and productivity is improved, but leakage current is generated due to charge transfer through the emission layer between neighboring subpixels, deteriorating picture quality
Solution Approach 1:
The emission layer is divided into multiple regions with different colors (red, green, blue) corresponding to different subpixels. This segmentation allows each subpixel to emit its specific color without requiring mask processes, while the trench structure further segments the emission layer in the boundary regions to prevent charge transfer between adjacent subpixels.
Solution Approach 2:
A trench structure is introduced as an intermediary element in the boundary regions between subpixels. This trench creates a physical barrier that interrupts the charge transfer path through the emission layer, thereby preventing leakage current while maintaining the overall structureless emission layer design for manufacturing efficiency.
2Object-affected harmful factors
If a mask process is used to pattern the emission layer for different-colored light in each subpixel, then picture quality is maintained by preventing charge transfer, but the number of mask processes increases and manufacturing precision requirements become more stringent
Solution Approach 1:
The emission layer is segmented into different colored regions corresponding to different subpixels through a structureless deposition process. This eliminates the need for mask alignment while maintaining the spatial separation of different colors required for picture quality.
Solution Approach 2:
The mask process is completely removed from the manufacturing sequence. Instead of using masks to pattern the emission layer, the invention extracts the patterning function and achieves it through selective deposition and the trench structure, thereby eliminating mask alignment precision requirements.
3Object-affected harmful factors
If the emission layer is made noncontiguous in the trench boundary region, then charge transfer between subpixels is prevented, but the emission layer structure becomes more complex
Solution Approach 1:
The emission layer is segmented into contiguous regions within subpixels and noncontiguous regions in boundary areas. This selective segmentation prevents charge transfer in critical boundary zones while maintaining simple continuous structures in active emission regions, balancing complexity and functionality.
Solution Approach 2:
The emission layer exhibits different structural qualities in different spatial locations: it is continuous in the center of subpixels for efficient emission, and noncontiguous in the boundary regions for charge isolation. This local variation in structure optimizes both emission efficiency and leakage prevention without requiring overall structural complexity.
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 configuration effectively reduces leakage currents and enhances picture quality by preventing charge transfer between subpixels and optimizing light emission efficiency through the micro-cavity effect.
Implementation Method 1
a pore below the emission layer inside the trench, an upper end of the pore being relatively higher than at least some of the emission layer
Implementation Method 2
The emission layer emits light by an electric field generated between the above two electrodes, to thereby display an image. The emission layer may include an organic material that emits light when an exciton is produced by a bond of an electron and a hole, and the exciton falls to a ground state from an excited state.
Implementation Method 3
varying electrode distances to achieve a micro-cavity effect for improved light efficiency
Data Source
AI summary
An electroluminescent display device includes: an electroluminescent display device, including: a substrate including: a first subpixel, and a second subpixel, a respective first electrode in each of the first subpixel and the second subpixel on the substrate, a trench in a boundary between the first subpixel and the second subpixel on the substrate, an emission layer on the first electrode, and in the first subpixel, the second subpixel, and the boundary between the first subpixel and the second subpixel, at least some of the emission layer being noncontiguous in the trench, a pore below the emission layer inside the trench, an upper end of the pore being relatively higher than at least some of the emission layer, and a second electrode on the emission layer.