Selective Insulating Layer for EL Display Chromaticity
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Solution Overview
Problem
Conventional organic electroluminescence (EL) displays face issues with inconsistent chromaticity coordinates due to uniform thickness of insulating layers under pixel electrodes, leading to narrower color gamut and increased power consumption.
Innovation Solution
The solution involves selectively forming insulating layers under the pixel electrodes of red (R), green (G), and blue (B) sub-pixels, allowing for controlled optical paths for each color, thereby maintaining consistent chromaticity coordinates and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If insulating layers are uniformly formed under all pixel electrodes, then manufacturing is simplified, but chromaticity coordinates become inconsistent across R, G, and B sub-pixels
Solution Approach 1:
The patent applies local quality by forming insulating layers with different thicknesses or materials specifically under different color sub-pixels (R, G, B). Each sub-pixel region receives a customized insulating layer configuration that compensates for the specific optical path length requirements of that color, thereby achieving consistent chromaticity coordinates across all sub-pixels while maintaining a relatively simple manufacturing process.
2Manufacturing precision
If insulating layer thickness is increased to improve chromaticity, then color gamut expands, but power consumption increases
Solution Approach 1:
The patent implements local quality by selectively adjusting insulating layer thickness or material composition only in specific sub-pixel regions where chromaticity compensation is needed. This localized approach achieves the required chromaticity coordination without uniformly increasing insulating layer thickness across the entire display, thereby avoiding unnecessary power consumption increases while still expanding color gamut where beneficial.
3Manufacturing precision
If insulating layers are selectively formed for each sub-pixel, then chromaticity coordinates are optimized, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing selective insulating layer formation only where chromaticity compensation is required for different sub-pixels. This approach optimizes chromaticity coordinates through localized structural variations rather than complex global modifications, thereby achieving high manufacturing precision while controlling device complexity through targeted rather than universal modifications.
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 enhances the color gamut and reduces power consumption by ensuring optimal thickness and presence of insulating layers for each sub-pixel, resulting in superior chromaticity coordinates and improved display performance.
Implementation Method 1
Each of the R, G, and B sub-pixels includes an electroluminescence (EL) unit including an anode electrode, a cathode electrode, an emissive layer provided between the anode and cathode electrodes
Data Source
AI summary
An organic electroluminescence display in which an insulating layer underlying a lower electrode is selectively formed in each of R, G, and B sub-pixels to prevent the shifting of chromaticity coordinates and reduce power consumption, and a method of manufacturing the same are provided. The organic electroluminescence display includes a substrate including a plurality of sub-pixel regions, each of the sub-pixel regions include including an emitting region and a non-emitting region and emits a predetermined color of light, a plurality of driving units provided in the non-emitting region of each sub-pixel region, a plurality of pixel electrodes provided in the emitting region of each sub-pixel region and connected with one of the respective driving units, and an insulating layer provided under the pixel electrodes, wherein the insulating layer is provided on an entire surface of the substrate except for at least one of the emitting regions in the sub-pixel regions.