Transparent Conductive Layer Resistivity for Display Color Shift
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Solution Overview
Problem
Conventional light-emitting display apparatuses experience inefficiencies and color shift issues due to variations in viewing angles, primarily attributed to differences in transmittance and reflectance of transparent and reflective layers across pixels.
Innovation Solution
The implementation of a light-emitting display apparatus with varying transmittances in transparent conductive layers and reflectivities in reflective layers, achieved through differences in oxygen concentrations and aperture patterns, respectively, to stabilize color output and enhance efficiency across different viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If uniform transmittance and reflectance are used across all pixels, then manufacturing is simpler, but color shift occurs at different viewing angles
Solution Approach 1:
The patent applies local quality by making each pixel electrode have different transmittance characteristics tailored to its specific color emission requirements. The first pixel electrode (first color) has a first transparent conductive layer with specific transmittance, while the second pixel electrode (second color) has a second transparent conductive layer with different transmittance. This localized optimization compensates for viewing angle-dependent color shifts without requiring complete redesign of the entire display structure.
2Stability of the object's composition
If different transmittances are used in transparent conductive layers, then color shift is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes by systematically varying the transmittance values of transparent conductive layers across different pixel electrodes. The first transparent conductive layer has a first transmittance value and the second transparent conductive layer has a second transmittance value, which are specifically selected to compensate for the different viewing angle characteristics of different color emissions. This parameter optimization reduces color shift while maintaining manufacturability.
3Stability of the object's composition
If apertures are formed in reflective layers, then color shift is improved, but device complexity increases
Solution Approach 1:
The patent applies the porous materials principle by forming apertures (porous structures) in the reflective layers of pixel electrodes. These apertures modify the optical path and improve color consistency by reducing viewing angle-dependent color shifts. The apertured reflective layer allows controlled light extraction while maintaining the reflective function, achieving color stability without requiring completely new structural approaches.
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 effectively reduces color shift and improves display quality and efficiency by modifying the transmittance of transparent conductive layers and reflectance of reflective layers, ensuring consistent performance regardless of viewing angle.
Implementation Method 1
Excitons are generated in response to holes injected from the hole injection electrode and electrons injected from the electron injection electrode being combined in the organic emission layer. When the excitons drop from an excited state to a ground state, light is generated or otherwise emitted.
Data Source
AI summary
A light-emitting display apparatus includes a substrate, a first pixel electrode, a second pixel electrode, a first electroluminescent layer, and a second electroluminescent layer. The substrate includes a first region adjacent to a second region. The first pixel electrode overlaps the first region. The first pixel electrode includes a first transparent conductive layer. The second pixel electrode overlaps the second region. The second pixel electrode includes a second transparent conductive layer. The first electroluminescent layer is disposed on the first pixel electrode. The first electroluminescent layer is configured to emit light in a first range of wavelengths. The second electroluminescent layer is disposed on the second pixel electrode. The second electroluminescent layer is configured to emit light in a second range of wavelengths different from the first range of wavelengths. Resistivity of the first transparent conductive layer is different from resistivity of the second transparent conductive layer.