OLED Antireflective Layer Sub-Pixel Area Ratio Optimization
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Solution Overview
Problem
OLEDs face challenges in achieving a high contrast ratio and long life time due to light reflection issues, which are partially addressed by polarizers that reduce light penetration and increase power consumption.
Innovation Solution
An OLED structure with an antireflective layer in each sub-pixel, where the antireflective layer to sub-pixel area ratio is optimized between 60% and 87% to balance contrast ratio and life time, eliminating the need for a polarizer and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer is placed on the surface of the substrate to reduce ambient light reflection, then the contrast ratio is improved, but the light penetration rate decreases to 42% causing insufficient luminous efficiency
Solution Approach 1:
The patent changes the optical parameters of the substrate surface by introducing an antireflective coating with specific refractive index and thickness parameters. This coating reduces ambient light reflection through optical interference effects while maintaining high light penetration rates, thereby improving contrast ratio without sacrificing luminous efficiency
Solution Approach 2:
The patent introduces an antireflective coating as an intermediary layer between the ambient environment and the OLED display surface. This intermediate layer selectively interacts with ambient light to reduce reflection while allowing display light to pass through efficiently, resolving the contradiction between contrast ratio improvement and luminous efficiency maintenance
2Illumination intensity
If high voltage is provided to organic emitting elements to increase luminosity, then the brightness is improved, but the power consumption increases and the life time is shortened
Solution Approach 1:
The patent converts the harmful effect of ambient light reflection into a beneficial effect by using the antireflective coating to selectively reflect harmful ambient light while allowing beneficial display light to pass through. This eliminates the need for high voltage compensation, maintaining brightness without increasing power consumption or reducing lifetime
3Illumination intensity
If a polarizer is used to reduce ambient light reflection, then the contrast ratio is improved, but the power consumption increases
Solution Approach 1:
The antireflective coating serves as an intermediary that passively reduces ambient light reflection through optical interference without requiring active energy input. This eliminates the need for high power consumption associated with polarizer-based solutions while maintaining improved contrast ratio
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 enhances the contrast ratio of OLEDs without shortening the life time of organic emitting elements, allowing for both improved image quality and extended life, while avoiding the need for high voltage and polarizers.
Implementation Method 1
an antireflective layer formed in each sub-pixel... to reduce the reflection of the ambient light
Data Source
AI summary
An OLED has a first substrate, a second substrate, a plurality of organic emitting elements positioned in each sub-pixel, and an antireflective layer. The ratio of the area of the antireflective layer to that of the sub-pixel is between about 60% to about 87%.