OLED Over-coating Film Curved Surface Slope Angles
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Solution Overview
Problem
The existing manufacturing processes for organic light emitting devices (OLEDs) require additional steps to form micro-cavities of different lengths for various colors, increasing manufacturing costs and complexity while aiming to enhance color reproducibility and efficiency.
Innovation Solution
The OLED design features a thin film transistor substrate with an over-coating film having curved surfaces on pixels of different colors, where the slope angles of depressed portions are optimized for each color to achieve path differences that enhance specific wavelengths, thereby simplifying the manufacturing process and improving color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional processes are implemented to form different lengths of micro-cavities according to colors, then color reproducibility is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by forming micro-cavities with different depths in different pixel regions corresponding to different colors (red, green, blue). Each color region has a specifically optimized micro-cavity depth to enhance its emitted wavelength, achieving improved color reproducibility without requiring separate manufacturing processes for each color.
Solution Approach 2:
The patent changes the depth parameter of micro-cavities according to the color type of each pixel region. By adjusting the micro-cavity depth parameter locally in different color regions, the patent optimizes light extraction efficiency for each wavelength while using a single unified manufacturing process.
2Manufacturing precision
If additional processes are implemented to form different lengths of micro-cavities according to colors, then color reproducibility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the formation of micro-cavities with the existing color filter formation process. By combining these two processes into a single manufacturing step, the patent achieves different micro-cavity depths for different colors without adding separate manufacturing processes, thereby reducing manufacturing complexity.
Solution Approach 2:
The patent implements local quality by forming micro-cavities with color-specific depths during the color filter formation process. This approach allows differentiation of micro-cavity characteristics across color regions while maintaining a unified manufacturing process, reducing overall process complexity.
3Manufacturing precision
If micro-cavities of different lengths are formed for various colors, then color reproducibility is improved, but the number of manufacturing steps increases
Solution Approach 1:
The patent combines the micro-cavity formation process with the color filter formation process into a single manufacturing step. This merging eliminates the need for separate additional processes to create different micro-cavity lengths for different colors, thereby maintaining high color reproducibility while improving manufacturing efficiency.
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 allows for enhanced light extraction and color reproduction by optimizing the slope angles of depressed portions on the over-coating film, reducing manufacturing complexity and costs while maintaining high efficiency and color accuracy.
Implementation Method 1
The micro-cavity effect is a phenomenon in which light of a predetermined wavelength is enhanced due to constructive interference generated in a micro-cavity where a space is formed between two reflection surfaces for reflecting the light.
Implementation Method 2
reflection is generated in the interface surface between the first electrodes and the over-coating film due to a difference in refractive indexes of the first electrodes and the over-coating film
Implementation Method 3
light loss by total reflection may be reduced on the interface surface between the first electrodes and the over-coating film to thereby increase light extracting efficiency
Data Source
AI summary
An organic light emitting device according to an embodiment includes a thin film transistor substrate including a plurality of thin film transistors and an over-coating film formed on the thin film transistors. The over-coating film includes a curved surface on at least two pixels among pixels of different colors and the slope angles of depressed portions forming the curved surface are respectively different from each other depending on the colors of the pixels. A plurality of first electrodes formed on the over-coating film includes a surface formed according to the curved surface, an organic light emitting member formed on the first electrodes includes a surface formed according to the curved surface, and a second electrode formed on the organic light emitting member includes a surface formed according to the curved surface. Slope angles of the depressed portions increase according to a decrease of wavelengths of the colors of the pixels.