Electroluminescent Display Subpixel Segmentation for Light Efficiency
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Solution Overview
Problem
Electroluminescent display devices that emit white light face limitations in light efficiency due to the need for a color filter layer, which reduces light emission by allowing only specific wavelengths to pass through, thereby deteriorating overall light efficiency.
Innovation Solution
The electroluminescent display device incorporates a substrate with multiple sub-pixels, each with a first and second emission area, where the first emission area emits mixed light of different colors, and the second emission area emits the same color as the first sub-pixel, increasing the amount of light emitted and improving light efficiency by optimizing the electric field configuration and emission layer structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter layer is used to emit white light by wavelength selection, then color purity is improved, but light efficiency deteriorates due to light loss
Solution Approach 1:
The emission layer is divided into multiple sub-emission areas (first sub-emission area, second sub-emission area, third sub-emission area) within each sub-pixel. Each sub-emission area emits different colored light (red, green, blue) independently, eliminating the need for a color filter layer while maintaining color purity and improving light efficiency by directly emitting the required wavelengths.
Solution Approach 2:
Different regions of the emission layer are assigned different emission characteristics. Specifically, the first sub-emission area emits red light, the second sub-emission area emits green light, and the third sub-emission area emits blue light. This local differentiation allows each region to optimize its emission for its specific color, improving overall light efficiency without requiring wavelength filtering.
2Illumination intensity
If different colored emission layers are deposited by each sub pixel through mask process, then color purity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The emission layer is segmented into multiple sub-emission areas within each sub-pixel, with each area containing emission materials for different colors. This segmentation eliminates the need for complex mask processes to deposit different colored emission layers, as all emission materials can be deposited in a single process step, reducing device complexity while maintaining color purity.
Solution Approach 2:
Multiple colored emission materials (red, green, blue) are combined within the same emission layer structure in different sub-emission areas. This merging approach allows all colors to be deposited simultaneously without requiring separate mask processes for each color, significantly reducing manufacturing complexity while maintaining color purity.
3Illumination intensity
If mask process is used to pattern emission layer by sub pixel, then color purity is improved, but manufacturing precision requirements increase due to alignment difficulties
Solution Approach 1:
The emission layer is segmented into multiple sub-emission areas with distinct boundaries defined by physical structures (such as insulating layers or electrode patterns). This segmentation eliminates the need for precise mask alignment, as the boundaries are formed by the underlying structure rather than by mask patterning, reducing manufacturing precision requirements while maintaining color purity.
Solution Approach 2:
The mask process is extracted from the manufacturing sequence entirely. Instead of using masks to define the boundaries of different colored emission areas, the boundaries are directly formed by the substrate structure, electrode patterns, or insulating layers, eliminating alignment difficulties and reducing manufacturing precision requirements.
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 light efficiency and color purity by allowing more light to be emitted from the first sub-pixel, while the second sub-pixel's emission area focuses on a single color, reducing the need for complex mask processes and improving power efficiency.
Implementation Method 1
The emission layer may be formed of an organic material which emits light when exciton is produced by a bond of electron and hole, and the exciton falls to a ground state from an excited state
Data Source
AI summary
An electroluminescent display device includes a substrate including a first sub pixel, a second sub pixel, and a third sub pixel, a first electrode in each of the first to third sub pixels on the substrate, an emission layer on the first electrode, and a second electrode on the emission layer, wherein the first sub pixel is provided with a first emission area including a first sub emission area and a second sub emission area, and the first sub emission area is configured to emit mixed light of first colored light and second colored light, wherein the second colored light is different from the first colored light, and the second sub emission area is configured to emit the second colored light.