Display Apparatus Low Reflection Layer Design
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Solution Overview
Problem
Organic light-emitting display apparatuses face reduced visibility due to external light reflection, which existing technologies have not effectively addressed.
Innovation Solution
A display apparatus design incorporating a low reflection layer with inorganic materials, a light-shielding layer with openings for emission areas, a color filter layer for red wavelengths, and a reflection control layer to minimize external light reflection, enhancing visibility by optimizing light transmittance and reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarization film is used to reduce external light reflection, then visibility is improved, but light transmittance and manufacturing complexity are adversely affected
Solution Approach 1:
The antireflection layer is divided into multiple sub-layers with different refractive indices (first antireflection sub-layer with n=1.3-1.6, second with n=1.6-1.8, third with n=1.8-2.0). This segmentation allows each sub-layer to contribute to reducing reflection at specific interfaces, achieving superior antireflection performance without requiring complex polarization films.
Solution Approach 2:
The patent optimizes specific parameters including thickness ratios (t1:t2:t3 between 1:1.5:2.0 to 1:2.0:2.5), refractive indices of each sub-layer, and material composition ratios (organic material 30-70 wt%, inorganic material 30-70 wt%). These parameter optimizations enable the multi-layer structure to achieve maximum light transmittance while minimizing reflection across different wavelengths.
2Manufacturing precision
If separate color filters are arranged for each pixel to improve color accuracy, then color quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The third antireflection sub-layer serves dual functions: it provides antireflection properties (with refractive index 1.8-2.0) and simultaneously acts as a color filter (specifically a red color filter with thickness 50-200 nm). This multi-functionality eliminates the need for separate color filter layers for each pixel, reducing structural complexity while maintaining color accuracy.
Solution Approach 2:
The patent merges the color filtering function with the antireflection function by incorporating color filter materials (such as cyanine dyes, squarylium dyes, or phthalocyanine dyes) into the third antireflection sub-layer. This combination reduces the total number of layers and simplifies the manufacturing process while achieving both antireflection and color filtering effects.
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 significantly improves visibility by reducing external light reflection, maintaining high light efficiency and simplifying the manufacturing process compared to using polarization films or separate color filters for each pixel.
Implementation Method 1
a low reflection layer arranged on the first light-emitting device, the second light-emitting device, and the third light-emitting device and including an inorganic material
Implementation Method 2
a color filter layer arranged in the openings of the light-shielding layer corresponding to only the first light-emitting device among the first light-emitting device, the second light-emitting device, and the third light-emitting device
Implementation Method 3
the color filter layer may include a scattering agent. According to one or more embodiments, the scattering agent may include at least one of TiO2, ZnO, Al2O3, SiO2, hollow silica, or polystyrene particles
Data Source
AI summary
A display apparatus that includes a substrate; a first light-emitting device, a second light-emitting device, and a third light-emitting device, which are arranged on the substrate and respectively form emission areas by emitting light of wavelengths different from one another; a low-reflection layer arranged on the first light-emitting device, the second light-emitting device, and the third light-emitting device and including an inorganic material; a light-shielding layer arranged above the low-reflection layer, corresponding to a non-emission area between the emission areas and having openings corresponding to the emissions areas; a color filter layer arranged in the openings of the light-shielding layer, corresponding to only the first light-emitting device among the first light-emitting device, the second light-emitting device, and the third light-emitting device; and a reflection control layer arranged on the light-shielding layer and the color filter layer is provided.