Resonator Display Subpixel Layout Without Optical Layer Steps
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Solution Overview
Problem
In display devices with a resonator structure, the film thickness of the optical path length adjustment layer varies for each color subpixel, leading to steps between subpixels, which cause degradation of optical characteristics and reliability defects.
Innovation Solution
A display device with a substrate featuring subpixels of multiple colors, each containing a light-emitting element with a resonator structure, a reflective layer, an optical path length adjustment layer, and electrodes, where the optical path length adjustment layer has a constant height and different layer configurations for each color subpixel to prevent steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the film thickness of the optical path length adjustment layer is adjusted for each color subpixel to achieve wavelength-specific resonance, then the optical characteristics for each color can be optimized, but steps are formed between subpixels leading to degradation of optical characteristics and reliability defects
Solution Approach 1:
The patent applies local quality by configuring different numbers of refractive index layers in different color subpixels (e.g., red subpixel has 3 layers, green has 2 layers, blue has 1 layer) to achieve wavelength-specific optical path length adjustment. This allows each color to have optimized resonance characteristics while the constant top surface height prevents step formation, resolving the contradiction between color-specific optical optimization and structural reliability.
2Illumination intensity
If the film thickness of the optical path length adjustment layer is adjusted for each color subpixel to achieve resonance at specific wavelengths, then color-specific optical performance can be improved, but steps are formed between subpixels causing degradation of optical characteristics
Solution Approach 1:
Different numbers of refractive index layers are configured in different color subpixels (red: 3 layers, green: 2 layers, blue: 1 layer) to achieve wavelength-specific resonance. This local differentiation in layer configuration allows each color to have optimized optical path length while the constant top surface height of the optical path length adjustment layer prevents step formation, resolving the contradiction between color-specific optical performance and manufacturing precision.
Solution Approach 2:
The patent resolves the thickness variation issue by transitioning to a different dimensional approach - instead of varying the overall thickness of the optical path length adjustment layer, it varies the number of internal refractive index layers while maintaining a constant top surface height. This dimensional shift allows optical path length adjustment without creating steps between subpixels.
3Adaptability or versatility
If a resonator structure with color-specific optical path length adjustment is implemented, then wavelength-specific resonance can be achieved, but steps between subpixels lead to degradation of optical characteristics
Solution Approach 1:
The patent implements wavelength-specific resonance by configuring different numbers of refractive index layers in different color subpixels (red: 3 layers, green: 2 layers, blue: 1 layer). This local quality differentiation allows each color to have optimized optical path length for its wavelength while the constant top surface height of the optical path length adjustment layer prevents step formation, resolving the contradiction between adaptability for wavelength-specific resonance and manufacturing precision.
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
Prevents the generation of steps between subpixels, thereby maintaining optical characteristics and reliability by ensuring a uniform optical path length for each color, thus enhancing the display's performance.
Implementation Method 1
the optical path length adjustment layer has a different layer configuration for each of the subpixels of the plurality of colors
Implementation Method 2
each of the subpixels includes a light-emitting element with a resonator structure
Implementation Method 3
the light-emitting element includes a reflective layer, an optical path length adjustment layer, a first electrode, an electroluminescent layer, and a second electrode in this order
Implementation Method 4
each of the subpixels includes a light-emitting element with a resonator structure, and the light-emitting element includes a reflective layer, an optical path length adjustment layer, a first electrode, an electroluminescent layer, and a second electrode
Data Source
AI summary
Display devices that prevent the generation of a step between subpixels are disclosed. In one example, a display device includes a substrate and subpixels of a plurality of colors two-dimensionally arranged on the substrate. Each of the subpixels includes a light-emitting element with a resonator structure, and the light-emitting element includes a reflective layer, an optical path length adjustment layer, a first electrode, an electroluminescent layer, and a second electrode in this order. The optical path length adjustment layer has a facing surface facing the electroluminescent layer, and the height of the facing surface is constant for each of the subpixels of the plurality of colors. The optical path length adjustment layer includes a plurality of refractive index layers with different refractive indexes, and the optical path length adjustment layer has a different layer configuration for each of the subpixels of the plurality of colors.