Color Filter Array for OLED Displays Using Mixed Light Conversion
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Solution Overview
Problem
Current methods for implementing full color in flat display devices, such as the 3-color light-emitting method, color filter method, and color conversion method, face issues with light-emitting efficiency, color purity, and manufacturing complexity, as well as severe variation in color coordinate values with driving voltage and current density.
Innovation Solution
A color filter array comprising a red filter, a green filter, and a blue filter, each with specific color conversion and blocking materials, is used to improve light-emitting efficiency and color coordinate values by converting and blocking light effectively from a mixed light source of blue and red wavelengths, thereby enhancing full color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the color filter method is used to split white light into red, green, and blue light, then full color can be implemented, but the amount of light is decreased since white color is absorbed into the color filter
Solution Approach 1:
The patent changes the light source parameters from white light to a mixed light of blue and red wavelengths, and adjusts the color filter materials to convert blue light to green light, thereby improving light transmission efficiency while maintaining full color capability
Solution Approach 2:
The patent uses color conversion materials in the red and green filters to convert blue light to green light and red light, respectively, changing the wavelength parameters to achieve better color reproduction with improved light efficiency
2Reliability
If the 3-color light-emitting method is used with red, green, and blue light sources, then full color can be implemented, but the lifespan of any one color determines the lifespan of the entire system
Solution Approach 1:
The patent makes the organic light-emitting layer serve multiple functions by having it emit both blue and red light simultaneously, eliminating the need for separate red and blue light sources and extending system lifespan based on a single light-emitting layer
Solution Approach 2:
The patent combines the red and blue light-emitting functions into a single organic light-emitting layer that emits mixed light of blue and red wavelengths, simplifying the system structure and improving reliability
3Illumination intensity
If the color conversion method is used with a blue light-emitting source and color conversion material, then full color can be implemented, but contrast is reduced since the color conversion material is excited by blue light
Solution Approach 1:
The patent applies color conversion materials selectively in the red and green filters while leaving the blue filter without color conversion material, allowing the blue light to pass directly through the blue filter without excitation, thereby maintaining high contrast
4Illumination intensity
If conventional red and green filters are used with three wavelengths, then color light-emitting can be achieved, but light-emitting efficiency and color purity of red light are not good
Solution Approach 1:
The patent changes the wavelength parameters by using a mixed light source of blue and red wavelengths instead of three wavelengths, and adjusts the color filter materials to convert blue light to green light, achieving improved light-emitting efficiency and color purity
Solution Approach 2:
The patent uses composite color filter structures combining color conversion materials and blocking materials to achieve both high light-emitting efficiency and color purity for red and green light
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 improves light-emitting efficiency and color coordinate values for red and green light, reduces manufacturing complexity, and minimizes variation in color coordinates with driving voltage and current density, achieving better full color representation.
Implementation Method 1
a first color conversion material for converting the blue light to green light and red light
Implementation Method 2
a green blocking material for blocking the green light
Data Source
AI summary
A color filter array is provided that is capable of implementing full color with improved light-emitting efficiency and color coordinate values from a mixed light of blue and red, and an organic light-emitting display device using the same. A color filter array receiving a mixed light of blue wavelength light and red wavelength light to implement full color according to an embodiment of the invention comprises a red filter, a green filter, and a blue filter. The red filter includes a first color conversion material for converting the blue wavelength light into green light and red light and a green blocking material for blocking the green light. The green filter includes a second color conversion material for converting the blue wavelength light into green light and red light and a red blocking material for blocking the red light. The blue filter includes a red blocking material for blocking the red wavelength light.