Reflective Electrode Stack for White-Light Display Reflection
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Solution Overview
Problem
Reflective display devices face limitations in brightness due to low reflectivity of traditional materials like Al and AlNd, and issues with color shift when using Ag, which affects the displaying effect, especially under dim ambient light conditions.
Innovation Solution
A reflective electrode with a reflective conductive layer and a color compensation layer is designed, where the color compensation layer adjusts the reflectivity ratio between different wavelengths to achieve white light reflection, using a stack of layers with varying refractive indices to minimize color deviation and include a light transmissive layer for alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional materials like Al and AlNd are used for reflective electrode, then manufacturing is simple and reliable, but reflectivity is low limiting brightness
Solution Approach 1:
The patent uses a composite structure combining Ag (silver) reflective layer with a color compensation layer consisting of multiple sub-layers with different materials and optical properties. This composite material approach achieves high reflectivity while compensating for color shift, resolving the contradiction between brightness improvement and manufacturing complexity.
Solution Approach 2:
The patent optimizes specific parameters including Ag layer thickness (5-20 nm), color compensation layer thickness (20-100 nm), and refractive indices of different layers to achieve maximum reflectivity while maintaining color accuracy. This parameter optimization enables high brightness performance.
2Illumination intensity
If Ag is used for reflective electrode, then reflectivity is high improving brightness, but color shift occurs affecting displaying effect
Solution Approach 1:
The patent introduces a color compensation layer with specific optical properties that counteracts the yellow color shift inherent to Ag reflection. This layer modifies the reflected light spectrum to achieve neutral white light output, resolving the color stability issue while maintaining high brightness.
Solution Approach 2:
The color compensation layer acts as an intermediary between the Ag reflective layer and the viewer, modifying the reflected light to eliminate color distortion. This mediator layer ensures accurate color reproduction while preserving the high reflectivity of Ag.
3Stability of the object's composition
If color compensation layer is added to achieve white light reflection, then color accuracy improves, but device complexity increases
Solution Approach 1:
The color compensation layer is segmented into multiple sub-layers, each with specific optical functions. This segmentation allows precise control over light reflection characteristics while maintaining overall structural organization and manufacturability.
Solution Approach 2:
The patent specifies precise parameter ranges for the color compensation layer including thickness (20-100 nm), refractive index (1.3-1.7), and material composition to achieve optimal color accuracy. These controlled parameters ensure consistent performance while simplifying the manufacturing process.
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
The solution enhances the reflective characteristics across the visible light spectrum, producing light close to white and improving the displaying effect by controlling the reflectivity ratio and using silver for high reflectivity while preventing color shift.
Implementation Method 1
The color compensation layer is configured such that the reflective electrode has a third reflectivity to the first light and a fourth reflectivity to the second light. A ratio of an absolute value of a difference between the third reflectivity and the fourth reflectivity to the third reflectivity is smaller than 16.4%.
Implementation Method 2
The color compensation layer includes a stack of at least one layer having a first refractive index and at least one layer having a second refractive index. The first refractive index is greater than the second refractive index.
Implementation Method 3
The reflective conductive layer has a first reflectivity to first light having a first wavelength and a second reflectivity to second light having a second wavelength. The first light and the second light are combined into white light.
Data Source
AI summary
The present disclosure relates to a reflective electrode and an array substrate and a display device thereof. The reflective electrode includes a reflective conductive layer and a color compensation layer located on the reflective conductive layer. The reflective conductive layer has a first reflectivity to first light having a first wavelength and a second reflectivity to second light having a second wavelength. The first light and the second light are combined into white light. The first reflectivity is smaller than the second reflectivity. The color compensation layer is configured such that the reflective electrode has a third reflectivity to the first light and a fourth reflectivity to the second light. A ratio of an absolute value of a difference between the third reflectivity and the fourth reflectivity to the third reflectivity is smaller than 16.4%.