Planarized Color Filter Surface for OLED Electrode Formation
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Solution Overview
Problem
Conventional OLED devices face issues with surface roughness and performance due to the direct formation of transparent anode electrodes on color-filtering units, leading to short circuits and current leakage, which complicates manufacturing and increases costs.
Innovation Solution
The method involves planarizing the color filter surface after formation on the active matrix substrate to reduce surface roughness to less than 10 nm without a separate planarization layer, using techniques like UV treatment, O2 plasma treatment, or polishing, ensuring a smooth surface for electrode formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate planarization layer is added between the color filter and transparent electrode, then surface roughness is reduced and electrode performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the separate planarization layer from the device structure, extracting this function entirely. Instead of adding a planarization layer between the color filter and transparent electrode, the invention applies planarization treatment directly to the color filter surface, eliminating the need for an additional layer while maintaining the required surface smoothness for electrode formation.
Solution Approach 2:
The patent merges the planarization function into the color filter layer itself. By applying planarization treatment (such as chemical mechanical polishing or plasma treatment) directly to the color filter, the invention combines the color filtering function and surface planarization function into a single integrated layer, eliminating the need for a separate planarization layer.
2Reliability
If a separate planarization layer is added between the color filter and transparent electrode, then surface roughness is reduced and short circuits are prevented, but manufacturing time and cost increase
Solution Approach 1:
The patent extracts the planarization function from a separate layer and applies it directly to the color filter, eliminating the need for additional layer deposition time. The planarization treatment is performed on the color filter surface before electrode formation, reducing the total number of manufacturing steps and time required.
Solution Approach 2:
The patent performs planarization treatment on the color filter surface as a preliminary step before transparent electrode formation. By pre-planarizing the color filter surface through treatments such as chemical mechanical polishing or plasma treatment, the invention ensures a smooth substrate for subsequent electrode deposition, preventing short circuits while streamlining the manufacturing process.
3Ease of manufacture
If transparent electrode is formed directly on rough color filter surface, then manufacturing process is simplified, but surface roughness increases causing short circuits and current leakage
Solution Approach 1:
The patent applies planarization treatment to the color filter surface as a preliminary step before transparent electrode formation. This pre-treatment ensures that the color filter surface has sufficient smoothness (Ra < 10 nm) to support reliable electrode formation, preventing short circuits and current leakage while maintaining manufacturing simplicity.
Solution Approach 2:
The patent changes the surface roughness parameter of the color filter from approximately 20 nm (conventional) to less than 10 nm through planarization treatments such as chemical mechanical polishing or plasma treatment. This parameter change enables direct electrode formation on the color filter without requiring a separate planarization layer, maintaining process simplicity while improving reliability.
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 simplifies the manufacturing process, reduces surface roughness, and enhances the performance of OLED devices by preventing short circuits and current leakage, while maintaining the required smoothness for the electrodes.
Implementation Method 1
The color filter may be planarized by, for example, UV treatment, O2 plasma treatment or polishing
Implementation Method 2
The color filter may be planarized by, for example, UV treatment, O2 plasma treatment or polishing
Implementation Method 3
The color filter may be planarized by, for example, UV treatment, O2 plasma treatment or polishing
Implementation Method 4
The color filter may be planarized by, for example, UV treatment, O2 plasma treatment or polishing
Data Source
AI summary
A light-emitting device and the fabrication method thereof. A substrate is provided. A plurality of active elements are formed on the substrate, defining a plurality of pixel areas. A color filter is formed on the pixel areas. The surface of the color filter is planarized to reduce roughness. An electrode is formed on the color filter. An light-emitting layer is formed on the electrode. A second electrode is formed on the light-emitting layer.