Red Conversion Layer for OLEDoS Pixel Formation
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Solution Overview
Problem
Current microdisplay technologies, particularly OLED on Silicon (OLEDoS), face challenges in achieving high resolution and efficient manufacturing, especially in realizing red, green, and blue colors, which often require complex CMOS processes and color filters.
Innovation Solution
The proposed solution involves a display device structure with green and blue light emitting element groups arranged in a specific pattern on a substrate, where a red conversion pattern overlaps portions of the green and blue elements, allowing for efficient formation of red pixels without the need for color filters, using a method that includes forming electrodes, light emitting patterns, and a red conversion layer through photolithography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a white OLED is manufactured and color filters are used to realize red, green, and blue colors, then the display device can achieve full color, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and eliminates the color filter component from the display structure. Instead of using a white OLED with color filters, the patent directly forms red, green, and blue light emitting elements through selective deposition of light emitting materials on respective red, green, and blue pixels, thereby removing the need for color filters and simplifying the manufacturing process
Solution Approach 2:
The invention inverts the conventional approach by instead of starting with a white OLED and filtering colors, it directly creates colored light emission at the pixel level through selective material deposition. The red, green, and blue light emitting elements are formed directly on their respective pixel regions without requiring a white OLED layer and subsequent color filtering
2Adaptability or versatility
If a white OLED is manufactured with color filters, then red, green, and blue colors can be realized, but the manufacturing efficiency decreases
Solution Approach 1:
The invention segments the light emitting function by creating separate red, green, and blue light emitting elements that are selectively deposited on their respective pixel regions. This segmentation allows for direct formation of colored pixels without the need for a unified white OLED layer and subsequent color filtering, thereby improving manufacturing efficiency
Solution Approach 2:
The invention performs preliminary action by pre-defining the pixel structure and selectively depositing light emitting materials in specific patterns before final device assembly. The red, green, and blue light emitting materials are deposited in predetermined patterns corresponding to their respective pixel locations, streamlining the manufacturing process
3Manufacturing precision
If high resolution is achieved in microdisplay, then display quality improves, but the manufacturing precision requirements increase
Solution Approach 1:
The invention applies local quality by using a photoluminescent material with specific properties (red conversion pattern) localized at specific positions (overlapping green and blue light emitting elements) to achieve precise color control. This localized approach enables high resolution display quality without requiring complex structures across the entire device
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 the production of high-resolution display devices with improved efficiency in manufacturing, allowing for precise pixel formation and enhanced light emission, particularly in achieving red, green, and blue colors without the need for color filters, thus overcoming the limitations of existing OLEDoS technologies.
Implementation Method 1
forming a red conversion layer configured to convert green light and blue light to red light
Implementation Method 2
forming a red conversion pattern by performing photolithography on the red conversion layer
Data Source
AI summary
A display device according to an embodiment of the inventive concept provides includes a substrate, a green light emitting element group and a blue light emitting element group, which are repeatedly arranged in a first direction parallel to a top surface of the substrate, and a red conversion pattern on the green light emitting element group and the blue light emitting element group. Here, the red conversion pattern overlaps a portion of the green light emitting element group and a portion of the blue light emitting element group in a second direction perpendicular to the top surface of the substrate.