OLED Micro-lens and Blue Filter for Light Extraction
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Solution Overview
Problem
Organic light emitting display (OLED) devices face challenges in achieving high light out-coupling efficiency while maintaining optimal color temperature, as existing solutions like micro-lens arrays can degrade display quality and require increased power consumption.
Innovation Solution
The OLED device incorporates a substrate with a white pixel region, a blue color filter pattern in the non-emission area of the white pixel region, and a micro-lens structure in the overcoat layer, which enhances light extraction efficiency and maintains high color temperature by minimizing light leakage and ambient light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a micro-lens array or micro-lens is attached to improve light out-coupling efficiency, then light extraction is improved, but color temperature is lowered and display quality is degraded
Solution Approach 1:
The patent applies local quality by placing a blue color filter pattern specifically in the non-emission area of the white pixel region, while leaving the emission area without a color filter. This localized application allows the blue filter to correct color temperature in specific areas without affecting the overall light extraction efficiency achieved by the micro-lens structure.
Solution Approach 2:
The patent segments the white pixel region into emission area and non-emission area, applying different optical treatments to each. The micro-lens is positioned to optimize light extraction from the emission area, while the blue color filter is applied only to the non-emission area to adjust color temperature, allowing independent optimization of both parameters.
2Illumination intensity
If current is increased to improve brightness, then brightness is improved, but power consumption increases and lifespan decreases
Solution Approach 1:
The patent converts the harmful effect of light loss (which would require increased current to compensate) into a benefit by using the micro-lens structure to redirect and extract more light from the organic emitting layer. This improves brightness without requiring increased current, thereby reducing power consumption and extending lifespan.
3Loss of energy
If micro-lens array is attached to improve light extraction, then light out-coupling is improved, but ambient light reflection increases and display quality is degraded
Solution Approach 1:
The patent applies local quality by positioning the blue color filter pattern specifically in the non-emission area to address ambient light reflection and color temperature issues locally, while maintaining the micro-lens structure's light extraction enhancement in the emission area without introducing harmful reflections.
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 improves light out-coupling efficiency and maintains high color temperature, providing high-quality color images without compromising the lifespan or efficiency of the OLED device.
Implementation Method 1
a micro-lens can be formed in an overcoat layer of the OLED device
Implementation Method 2
a blue color filter pattern in a first region of the white pixel region
Data Source
AI summary
An organic light emitting display device includes a substrate including a white pixel region, a blue color filter pattern in a first region of the white pixel region, an overcoat layer covering the blue color filer pattern and including a micro-lens, a first electrode on the overcoat layer, an organic emitting layer covering the first electrode, and a second electrode covering the organic emitting layer.