OLED Pixel Layout Using Optical Path Lengths for Full Color
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Solution Overview
Problem
Current display technologies face challenges in achieving high resolution and low power consumption while maintaining full-color capabilities, particularly in OLED displays, due to limitations in manufacturing processes and efficiency of color production.
Innovation Solution
The development of full-color pixel arrangements with a limited number of emissive regions, utilizing different optical path lengths and thicknesses in sub-pixels, and potentially omitting color filters, to achieve sufficient color range and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RGB pixel arrangements with color filters are used, then full-color display capability is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes color filters from the pixel arrangement, extracting this component to simplify the device structure. By eliminating the need for color filters and using only red and green emissive regions, the device achieves full-color display capability with reduced complexity and manufacturing steps.
Solution Approach 2:
The patent makes emissive regions serve multiple functions by using red and green emissive regions to produce all required colors including blue through optical path length modulation. This multi-functionality reduces the number of distinct emissive regions needed while maintaining full-color capability.
2Adaptability or versatility
If multiple colors of emissive regions are used, then color range is improved, but manufacturing complexity increases
Solution Approach 1:
The patent extracts color filters from the manufacturing process, eliminating the need to manufacture and assemble multiple colored emissive regions with filters. This simplifies manufacturing while maintaining color range through optical path length control.
Solution Approach 2:
The patent changes the optical path length parameter of existing emissive regions to generate different colors. By modulating the optical path length in red and green emissive regions, the device produces blue and other colors without adding new emissive materials, thus simplifying manufacturing.
3Device complexity
If color filters are omitted, then device complexity is reduced, but color production efficiency may be compromised
Solution Approach 1:
The patent replaces the mechanical/optical filter system with an optical path length modulation system. Instead of using physical color filters to control light transmission, the device uses controlled optical path lengths to modulate the emission spectrum, achieving color production without filters.
Solution Approach 2:
The patent changes the optical path length parameter to control color output. By adjusting the optical path length in emissive regions, the device efficiently produces different colors through interference and resonance effects, maintaining high color production efficiency without filters.
4Measurement precision
If different optical path lengths are used in sub-pixels, then color precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the pixel arrangement into distinct red and green emissive regions with controlled optical path lengths. This segmentation allows independent optimization of each region's optical path length to achieve precise color output while managing manufacturing complexity through systematic design.
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 enables high-resolution, low-power OLED displays capable of producing full-color images with improved efficiency and reduced manufacturing complexity.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
One application for phosphorescent emissive molecules is a full color display
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.