Second Electrode Laser Ablation for OLED Transmissivity
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Solution Overview
Problem
There is a need for a method to suitably control the shape of the second electrode in organic EL display devices, particularly in ultrahigh-definition portable devices, where the second electrode must be precisely formed to enhance pixel density and transmissivity without extending over the entire substrate.
Innovation Solution
A manufacturing method involving the preparation of a layered body with a substrate, first electrodes, and organic layers, followed by forming a second electrode that overlaps the first electrodes, and then partly removing regions of the second electrode using laser irradiation to create openings, allowing for precise control of the electrode's shape and increased transmissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second electrode is formed to extend over the entire substrate region, then the manufacturing process is simpler, but the transmissivity and pixel density are reduced
Solution Approach 1:
The second electrode is segmented into multiple discrete electrode regions corresponding to individual pixels, with openings between them. This segmentation allows light to pass through the openings (improving transmissivity) while maintaining precise pixel definition (improving pixel density), resolving the contradiction between simple manufacturing and high precision display quality.
Solution Approach 2:
Regions of the second electrode are selectively removed (taken out) from areas where they would interfere with light transmission or pixel definition. By extracting unnecessary electrode material and creating controlled openings, the patent achieves both simplified manufacturing (through selective removal rather than complex patterning) and improved transmissivity/pixel density.
2Manufacturing precision
If the second electrode is formed with precise shape control, then the pixel density and transmissivity are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent forms a continuous second electrode layer first (preliminary action) before selectively removing portions of it. This preliminary formation simplifies the manufacturing process by using a single deposition step to create the base electrode structure, and subsequent selective removal achieves precise shape control without requiring complex patterning processes from the start.
Solution Approach 2:
The patent replaces complex mechanical patterning processes with a simpler approach: forming a continuous electrode layer followed by selective removal. This substitution of the manufacturing mechanism reduces process complexity while maintaining or improving the precision of electrode shape control.
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 method enables the formation of second electrode openings that enhance transmissivity and precision in the shape of the second electrode, addressing the challenge of achieving high pixel density and ultrahigh-definition display in portable devices.
Implementation Method 1
a removal step of partly removing regions of the second electrode that do not overlap the first electrodes in plan view
Data Source
AI summary
A manufacturing method for an electronic device includes a preparation step of preparing a layered body including a substrate, two or more first electrodes, and organic layers, the substrate having a first surface and a second surface that is positioned opposite to the first surface, the two or more first electrodes positioned above the first surface of the substrate, the organic layers positioned above the first electrodes; a second electrode formation step of forming a second electrode above the organic layers so that the second electrode overlaps the two or more first electrodes when viewed in a normal direction to the first surface of the substrate; and a removal step of partly removing regions of the second electrode that is positioned between the first electrodes in plan view.