Electroluminescent Display Sub-Pixel Auxiliary Layers
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Solution Overview
Problem
High-resolution electroluminescent display devices face challenges with low emission efficiency and complex manufacturing processes, particularly in precisely patterning different-colored emission layers without using masks.
Innovation Solution
The electroluminescent display device incorporates a substrate with sub-pixels, auxiliary layers, and electrodes, where auxiliary layers surround the sub-pixels and are electrically insulated, and overcoat layers are used to simplify the manufacturing process and improve emission efficiency by allowing for maskless patterning of electrodes and emission layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mask-based patterning is used to precisely pattern different-colored emission layers by each sub pixel, then manufacturing precision is improved, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent divides the emission layer into multiple stacks (first stack, second stack, third stack) with different materials and emission colors. Each stack is deposited through separate deposition processes without requiring masks, allowing precise spatial control of different-colored emission regions through sequential material deposition and selective removal processes.
Solution Approach 2:
The patent performs preliminary deposition of multiple emission layer stacks before final patterning. The first, second, and third stacks are deposited in advance with overlapping regions, and then selective removal is performed to define the final sub-pixel patterns. This preliminary multi-layer deposition simplifies the overall manufacturing process by eliminating the need for complex mask alignment steps.
2Ease of manufacture
If multiple emission layer stacks are deposited without masks to simplify manufacturing, then ease of manufacture is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent controls the vertical thickness of each emission layer stack to precisely control the lateral emission pattern. By adjusting the deposition thickness of the first, second, and third stacks, the patent achieves precise sub-pixel patterning without masks. The thickness control in the vertical dimension translates to precise lateral boundary definition between different colored sub-pixels.
Solution Approach 2:
The patent employs selective removal processes that change the physical and chemical parameters of the emission layer materials. By controlling removal conditions (such as solvent treatment or thermal processing), the patent achieves precise patterning of different-colored emission regions from the initially deposited multi-stack structure, maintaining high manufacturing precision without mask-based methods.
3Adaptability or versatility
If emission layers are configured to emit different colored light by each sub pixel, then product versatility is improved, but device complexity increases
Solution Approach 1:
The patent uses a universal multi-stack emission layer structure that can emit different colors (red, green, blue, white) by simply changing the material composition and thickness of the first, second, and third stacks. This unified structure serves multiple functions: it provides different colored emission, controls light extraction efficiency, and defines sub-pixel boundaries, eliminating the need for separate structures for each color type.
Solution Approach 2:
The patent employs composite emission layer structures where the first stack, second stack, and third stack are made of different organic or inorganic materials with complementary emission characteristics. By combining these materials in specific sequences and thicknesses, the patent achieves full-color emission capability while maintaining a relatively simple overall structure that can be manufactured using standard deposition techniques.
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 enhances emission efficiency and simplifies the manufacturing process by enabling efficient light emission and reducing the need for additional masking steps, while maintaining high-resolution capabilities.
Implementation Method 1
an emission layer is provided between an anode electrode and a cathode electrode, and the emission layer emits light by an electric field generated between the above two electrodes
Implementation Method 2
The emission layer may be configured to emit different colored light by each sub pixel, for example, red colored light, green colored light and blue colored light
Data Source
AI summary
An electroluminescent display device includes a substrate having a first sub pixel and a second sub pixel, an auxiliary layer provided on the substrate, wherein the auxiliary layer includes a first auxiliary layer configured to surround the periphery of the first sub pixel, and a second auxiliary layer configured to surround the periphery of the second sub pixel, a first electrode provided in each of the first sub pixel and the second sub pixel, an emission layer provided on the first electrode, and a second electrode provided on the emission layer, wherein the first electrode provided in the first sub pixel is connected with the first auxiliary layer, and the first electrode provided in the second sub pixel is connected with the second auxiliary layer.