OLED Display Panel Light Extraction via Localized High Refractive Index Layer
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Solution Overview
Problem
OLED display panels face issues with low light extraction efficiency and color cast due to differences in luminous efficiency among sub-pixels, leading to rapid service life attenuation and uneven display performance.
Innovation Solution
A display panel design featuring light-modulating sub-pixels with strategically positioned light-extracting portions and a high refractive index layer, where the light-extracting portions are closer to light-modulating sub-pixels than non-light-modulating sub-pixels, enhancing light extraction efficiency and reducing service life attenuation disparities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light-extracting portions are positioned closer to light-modulating sub-pixels to improve light extraction efficiency, then light extraction efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by positioning light-extracting portions selectively only at specific locations (sides of light-modulating sub-pixels) rather than uniformly across all sub-pixels. This localized approach optimizes light extraction where needed while avoiding unnecessary complexity in other areas. The high refractive index layer is also selectively applied only in regions where light extraction enhancement is required, further implementing the local quality principle.
Solution Approach 2:
The patent segments the display panel into different functional regions: light-modulating sub-pixels, non-light-modulating sub-pixels, and light-extracting portions. This segmentation allows each component to be optimized independently for its specific function, improving overall light extraction efficiency without requiring complex integration across the entire panel structure.
2Illumination intensity
If driving current is increased to compensate for low light extraction efficiency, then brightness is improved, but power consumption increases
Solution Approach 1:
The patent replaces the mechanical/electrical approach of increasing driving current with an optical approach using light-extracting portions and a high refractive index layer. Instead of forcing more electrical energy through the sub-pixels, the invention uses optical structures to redirect and extract existing light more efficiently, thereby improving brightness without proportionally increasing power consumption.
3Manufacturing precision
If uniform light extraction is achieved across all sub-pixels, then display uniformity is improved, but service life differences between sub-pixels increase
Solution Approach 1:
The patent applies local quality by providing different structures to different types of sub-pixels: light-modulating sub-pixels have light-extracting portions and high refractive index layers, while non-light-modulating sub-pixels do not. This differentiated approach allows each sub-pixel type to be optimized for its specific function, achieving display uniformity without forcing uniform structures that would accelerate degradation of non-light-modulating sub-pixels.
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
Improves light extraction efficiency and uniformity across sub-pixels, reducing the need for increased driving current, lowering power consumption, and minimizing service life differences, thereby mitigating color cast and extending the lifespan of OLED display panels.
Implementation Method 1
the high refractive index layer is located on sides of the light-extracting portions facing away from the substrate and covers the sub-pixels and the light-extracting portions, and the high refractive index layer has a refractive index greater than the light-extracting portion
Data Source
AI summary
Embodiments of the present disclosure provide a display panel and a display device. The display panel includes a substrate, sub-pixels located on a side of the substrate and including light-modulating sub-pixels and non-light-modulating sub-pixels, and light-modulating structures located on sides of the sub-pixels facing away from the substrate. The light-modulating structure includes light-extracting portions and a high refractive index layer. A first distance L1 between the light-extracting portion and the light-modulating sub-pixel closest to the light-extracting portion and a second distance L2 between the light-extracting portion and the non-light-modulating sub-pixel closest to the light-extracting portion satisfy L1<L2. The high refractive index layer is located on sides of the light-extracting portions facing away from the substrate and covers the sub-pixels and the light-extracting portions, and the high refractive index layer has a greater refractive index than that of the light-extracting portion.