Special-Shaped OLED Wiring Method for Narrow Frame Design
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Solution Overview
Problem
The existing wiring methods for special-shaped OLED products result in a wide frame portion, which fails to meet the requirement for a narrow frame, especially in compact and irregularly shaped designs such as wearable devices like smart watches.
Innovation Solution
A new wiring method where an isolation pillar layer is formed on the insulation layer, with the cathode material layer located between the isolation pillars of the frame portion, allowing the cathode material to be used as a shared cathode line for both the frame and display portions, thereby reducing the need for additional layers like ITO and MoAlMo layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If left and right wiring manner is employed at the frame portion, then the wiring structure is simple, but the frame portion becomes relatively wide
Solution Approach 1:
The patent transitions from a planar left-right wiring arrangement to a vertical stacking arrangement where the anode line and cathode line are positioned at different heights (different Z-dimension). The anode line is formed on the insulation layer while the cathode line is formed on the isolation pillar layer that protrudes vertically, creating a three-dimensional wiring structure that reduces horizontal frame width.
Solution Approach 2:
The patent implements a nested structure where the cathode line is positioned within the horizontal projection area of the isolation pillar layer, which itself is positioned above the anode line. This nested arrangement of wiring layers (anode line → insulation layer → isolation pillar layer → cathode line) allows compact vertical integration, reducing the overall frame width while maintaining electrical functionality.
2Reliability
If additional layers (ITO layer and MoAlMo layer) are added for frame wiring, then the wiring functionality is complete, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the frame portion wiring with the display portion wiring by using the same material layers. The anode line uses the ITO layer and MoAlMo layer that are also used for the display portion anode, and the cathode line uses the cathode material layer that is also used for the display portion cathode. This unified approach eliminates redundant layers and simplifies the manufacturing process while ensuring complete wiring functionality.
Solution Approach 2:
The patent makes the ITO layer, MoAlMo layer, and cathode material layer serve dual functions: they form both the display portion electrodes and the frame portion electrodes. The anode line and cathode line in the frame portion share the same material layers as the display portion, making these layers universal and multi-functional, thereby reducing the total number of manufacturing steps.
Data Source
AI summary
A wiring method for a special-shaped OLED product includes: forming an isolation pillar layer on an insulation layer, wherein the insulation layer includes an insulation layer of a display portion and an insulation layer of a frame portion, the isolation pillar layer includes an isolation pillar layer of the display portion and an isolation pillar layer of the frame portion, and the insulation layer of the frame portion is covered by the isolation pillar layer of the frame portion; forming a cathode material layer on the isolation pillar layer, wherein the cathode material layer includes a cathode material layer of the display portion and a cathode material layer of the frame portion, the cathode material layer of the frame portion is located between isolation pillars of the isolation pillar layer of the frame portion, and the cathode material layer of the frame portion is used as a cathode.