OLED Sub-Pixel Layout With Optical Path Length Tuning
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Solution Overview
Problem
Current display architectures face challenges in achieving low power consumption and high resolution OLED displays, with conventional RGBW architectures suffering from higher power consumption and shorter lifetime due to the need for color filters and complex masking steps.
Innovation Solution
The implementation of a full-color pixel arrangement using emissive regions that emit not more than two colors, with optical path lengths and patterned electrodes to optimize color production, allowing for simplified fabrication and increased resolution without the need for extensive color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional RGBW architecture is used, then full color display is achieved, but power consumption increases and lifetime decreases
Solution Approach 1:
The patent removes color filters from the display architecture, extracting the problematic component that causes both high power consumption and reduced lifetime. By using emissive regions that directly emit the required colors without filtration, the system eliminates the energy losses and degradation issues associated with color filters.
Solution Approach 2:
The display is segmented into distinct emissive regions (red, green, blue, yellow) that each emit their specific color directly. This segmentation allows each region to be optimized for its specific wavelength, improving efficiency and lifetime compared to a unified RGBW approach that requires color filtering for all pixels.
2Ease of manufacture
If color filters are used in RGBW architecture, then color display is achieved, but manufacturing complexity increases
Solution Approach 1:
Color filters are completely removed from the manufacturing process. Instead of depositing color filter layers and performing additional masking steps to pattern them, the invention directly patterns emissive regions that emit the desired colors, eliminating an entire class of manufacturing complexities.
Solution Approach 2:
The manufacturing process is segmented into distinct emissive region patterns that can be deposited in separate steps. This allows each color region to be independently controlled and optimized during fabrication, simplifying the overall process compared to attempting to create all four colors through a single complex masking sequence.
3Manufacturing precision
If conventional RGBW architecture with color filters is used, then resolution is limited, but simplifying the structure reduces color accuracy
Solution Approach 1:
The display is divided into finely segmented emissive regions for each color (red, green, blue, yellow). This segmentation enables higher resolution because each emissive region can be precisely patterned and controlled independently, achieving finer pixel densities while maintaining pure color emission from each segment.
Solution Approach 2:
Each emissive region is optimized for its specific local function - red regions emit only red, green regions emit only green, etc. This local quality optimization ensures that each pixel element produces the most saturated possible color for its designated wavelength, maintaining color accuracy while enabling higher resolution through the absence of color filter limitations.
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 approach results in improved power efficiency, longer display lifetime, and higher resolution capabilities compared to conventional RGBW and RGB SBS displays, with reduced masking steps and fewer color altering layers, enabling more efficient and cost-effective production.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
the wavelength at which an organic emissive layer emits light may generally be readily tuned with appropriate dopants
Data Source
AI summary
Full-color pixel arrangements for use in devices such as OLED displays are provided, in which multiple sub-pixels are configured to emit different colors of light, with each sub-pixel having a different optical path length than some or all of the other sub-pixels within the pixel.