Display Device Color Filter Scatterers Side Visibility
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Solution Overview
Problem
Current display devices face challenges in achieving efficient color reproduction and reducing color differences and luminance variations when viewed from different angles, particularly due to the lack of effective scatterers and polarization layers in their design.
Innovation Solution
A display device is designed with color filter layers containing scatterers and a polarization layer, where the scatterers and polarization layer are strategically integrated to reduce color and luminance differences by scattering incident light and controlling external light transmittance, respectively, without the need for a color conversion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filter layers with scatterers are added to improve color reproduction and reduce viewing angle dependence, then side visibility is improved, but device complexity increases
Solution Approach 1:
The patent combines the scattering function and color filtering function into a single integrated color filter layer. The scatterers (TiO2, ZnO, SiO2, or ZrO2 particles with 1-100 nm diameter) are dispersed within the color filter material, allowing the layer to simultaneously scatter light for improved side visibility and filter wavelengths for color reproduction. This merging eliminates the need for separate scattering layers while achieving both functions.
Solution Approach 2:
The color filter layer is constructed as a composite material containing both color filter dyes and inorganic scatterer particles. This composite structure enables the layer to perform multiple optical functions: the dye molecules provide wavelength-selective absorption for color filtering, while the dispersed inorganic particles provide isotropic scattering to reduce viewing angle dependence and improve side visibility without compromising color accuracy.
2Object-affected harmful factors
If a polarization layer is added to reduce external light reflectance, then image quality is improved, but device thickness increases
Solution Approach 1:
The patent employs a thin-film polarization layer constructed by depositing transparent resin layers with controlled thickness (50-200 nm each) and specific refractive indices. By optimizing the thickness and refractive index of each layer, the design achieves effective polarization for reducing external light reflectance while maintaining an overall thin profile. The multi-layer thin film structure creates optical interference effects that enhance polarization efficiency without requiring excessive thickness.
3Manufacturing precision
If scatterers with specific size and content are used to reduce color differences, then color reproduction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for the scatterers to optimize the balance between color reproduction and manufacturing feasibility: particle diameter of 1-100 nm (with preference for 5-50 nm), content of 1-10 wt% of the color filter layer, and specific refractive index differences (Δn > 0.5 relative to the binder). These parameter specifications ensure sufficient scattering for color uniformity while remaining compatible with conventional manufacturing processes. The narrow but achievable size range allows standard colloidal dispersion techniques to be used without requiring ultra-precision control.
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 side visibility and reduces reflectance of external light, improving image quality and maintaining a thin device thickness without increasing manufacturing costs.
Implementation Method 1
The color filter may include scatterers... first color filter layer disposed on the first light emitting element and the bank layer and including first scatterers... scatterers and polarization layer are strategically integrated to reduce color and luminance differences by scattering incident light
Implementation Method 2
polarization layer disposed on the first color filter layer and the second color filter layer... polarization layer may be a coating polarization layer including a dichroic dye... controlling external light transmittance
Data Source
AI summary
A display device includes a first light emitting element disposed in a first emission area and forming a first pixel, a second light emitting element disposed in a second emission area and forming a second pixel, a bank layer including a first opening corresponding to the first emission area, a second opening corresponding to the second emission area, and a non-emission area partitioning the first emission area and the second emission area, a first color filter layer disposed on the first light emitting element and the bank layer and including first scatterers, a second color filter layer disposed on the second light emitting element and the bank layer and including second scatterers, and a polarization layer disposed on the first color filter layer and the second color filter layer.