Light Emitting Apparatus Pixel Electrode Layer Segmentation
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Solution Overview
Problem
Existing light emitting apparatuses face challenges in securing sufficient color reproducibility and maintaining stable electric characteristics due to wide spectrum peak width and low intensity of emitted light, as well as potential deterioration of electric characteristics during the etching process for patterning electrodes.
Innovation Solution
The light emitting apparatus incorporates a design with a reflecting layer, a semi-transmitting semi-reflecting layer, and a light emitting layer, featuring pixel electrodes with different numbers of stacked electrode layers for each unit device, which prevents exposure of the etchant to the substrate and improves electrical connections, thereby stabilizing electric characteristics and enhancing color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If first electrodes having different thicknesses corresponding to RGB are formed by repeating the patterning process, then the color reproducibility is improved, but the electric characteristics deteriorate due to etchant exposure
Solution Approach 1:
The pixel electrode is divided into multiple electrode layers (first electrode layer, second electrode layer, third electrode layer) with different thicknesses corresponding to different colors. This segmentation allows each layer to be optimized for its specific color function while maintaining overall electrode integrity, resolving the contradiction between color reproducibility and electrical stability.
Solution Approach 2:
Different regions of the pixel electrode have different thicknesses tailored to specific color requirements. The electrode layers are locally optimized: thicker in regions requiring higher reflectivity for certain colors, thinner in regions where less reflectivity is needed. This local differentiation achieves superior color reproducibility without compromising overall electrical characteristics.
2Device complexity
If the number of stacked electrode layers is reduced for some unit devices, then the manufacturing complexity is reduced, but the color reproducibility may be compromised
Solution Approach 1:
The patent implements a tiered electrode layer structure where some unit devices receive all three electrode layers (excessive action for full color performance) while others receive fewer layers (partial action). This partial differentiation reduces manufacturing complexity for devices that don't require full color gamut, while maintaining color reproducibility for devices that do require it.
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 design effectively prevents etchant-induced deterioration, ensures reliable electrical connections, and achieves improved color reproducibility by emitting light with wavelengths corresponding to RGB, resulting in a light emitting apparatus with stabilized electrical characteristics and enhanced color representation.
Implementation Method 1
light having a resonance frequency corresponding to an optical distance between the light emitting layer and the second electrode is selectively amplified
Implementation Method 2
light reflecting layers (dielectric mirrors) are disposed between a first electrode which is disposed on a substrate to faces the light emitting layer
Data Source
AI summary
A light emitting apparatus includes first and second unit devices, each including a reflecting layer, a semi-transmitting semi-reflecting layer, a first light emitting layer disposed between the light reflecting layer and the semi-reflecting layer, and a resonator structure. Each resonator structure includes a light transmitting pixel electrode disposed between the corresponding light reflecting layer and semi-reflecting layer. The pixel electrode of the first unit device has more electrode layers than the pixel electrode of the second unit device.