OLED Pixel Arrangement 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 materials.
Innovation Solution
The development of OLED displays with pixel arrangements that utilize a limited number of emissive regions and optical path lengths, combined with patterned electrodes and color altering layers, to achieve full-color displays without the need for traditional color filters, allowing for higher resolutions and reduced power consumption.
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 manufacturing complexity and power consumption increase
Solution Approach 1:
The patent removes color filters from the conventional RGB pixel arrangement, extracting this component to simplify the device structure. By eliminating color filters and using only red and green emissive regions, the manufacturing process is simplified while still achieving full-color display capability through the human eye's color perception properties.
Solution Approach 2:
The patent makes emissive regions serve multiple functions by using red and green emissive regions to collectively provide red, green, and blue color capabilities. The red emissive region provides both red and yellow colors, while the green emissive region provides green and cyan colors, allowing a limited number of emissive regions to fulfill the role of traditional multiple colored sub-pixels.
2Adaptability or versatility
If multiple colored sub-pixels are used to achieve full-color display, then color range is improved, but power consumption increases
Solution Approach 1:
The patent merges the functions of multiple colored sub-pixels into fewer emissive regions. Instead of having separate red, green, and blue sub-pixels, the invention combines red and green emissive regions to achieve the same color range, thereby reducing the total number of emissive elements that require power and improving overall display efficiency.
3Device complexity
If color filters are removed to simplify manufacturing, then device complexity is reduced, but color accuracy may be compromised
Solution Approach 1:
The patent changes the operational parameters by utilizing the human eye's color perception characteristics and the spectral overlap between red and green emissions. By optimizing the emission characteristics and ratios of red and green emissive regions, the system achieves accurate color reproduction without color filters, maintaining color accuracy while simplifying the device structure.
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 OLED displays to achieve high resolutions, such as 250 dpi or higher, with reduced power consumption and improved manufacturing efficiency, while maintaining full-color capabilities.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
One example of a green emissive molecule is tris(2-phenylpyridine) iridium, denoted Ir(ppy)3
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.