OLED Sub-Pixel Grooves Block Light Leakage
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Solution Overview
Problem
Organic light emitting diode display devices suffer from low light extraction efficiency and display defects such as blurring and ghosting due to light leakage between neighboring sub-pixels, which degrade image quality and contrast ratio.
Innovation Solution
The introduction of grooves or holes between sub-pixels on the substrate or in a resin layer, filled with air or reflective materials, to block light pathways and improve light extraction efficiency by preventing light from neighboring sub-pixels, thereby enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light extraction pattern is provided to improve light extraction efficiency, then light extraction efficiency is improved, but light leakage between neighboring sub-pixels occurs causing display defects
Solution Approach 1:
The invention divides the substrate surface into distinct regions by forming grooves between neighboring sub-pixels. These grooves physically segment the light extraction areas, allowing each sub-pixel to extract light efficiently while preventing light from spilling into adjacent sub-pixel regions. The grooves act as isolation barriers that maintain the benefits of light extraction patterns without causing cross-contamination between sub-pixels.
Solution Approach 2:
The invention applies different structural characteristics to different regions: light extraction patterns (such as protrusions or textured surfaces) are applied locally to the active light-emitting areas of each sub-pixel to maximize light extraction, while groove regions between sub-pixels are designed with different properties (smoother surfaces or different refractive indices) to block light propagation. This localized differentiation allows simultaneous optimization of light extraction and light isolation.
2Illumination intensity
If light extraction patterns are added to enhance light output, then luminance is improved, but display quality deteriorates due to blurring and ghosting
Solution Approach 1:
By segmenting the substrate with grooves between sub-pixels, the invention ensures that light extraction enhancement in one sub-pixel does not compromise the optical isolation required for sharp display edges. Each sub-pixel can have aggressive light extraction features without causing blur or ghosting in neighboring areas, as the grooves prevent light from crossing sub-pixel boundaries.
Solution Approach 2:
The invention optimizes local optical properties: light extraction patterns are concentrated in the active emission zones to maximize luminance, while the groove regions between sub-pixels are designed with properties that prevent light scattering and maintain sharp display boundaries. This local optimization allows high luminance without sacrificing display quality.
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 solution effectively reduces light leakage and improves contrast ratio and display characteristics by blocking light between sub-pixels, preventing defects like blurring and ghosting, and achieving better image accuracy.
Implementation Method 1
a groove formed between the neighboring sub-pixels
Implementation Method 2
filled with air or reflective materials, to block light pathways
Data Source
AI summary
Disclosed is an organic light emitting diode display device having improved light extraction efficiency and display quality. The organic light emitting diode display device includes a plurality of sub-pixels including organic light emitting cells arranged in an inner side of a substrate, a groove formed between neighboring sub-pixels, and a light extraction pattern formed over an outer surface of the substrate.