OLED Electrode Layer Structure for IR-Drop and Laser Drilling Margin
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Solution Overview
Problem
Display devices experience voltage drop (IR-drop) phenomena and require improved laser drilling processes for high-resolution panels, which are not adequately addressed in existing technologies.
Innovation Solution
The display device incorporates a specific layer structure with openings in insulating films and metal layers, allowing for connections between voltage lines and electrodes through laser drilling and photolithography processes, minimizing voltage drops and securing drilling margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional layer structure is used in display devices, then the device can be manufactured with standard processes, but voltage drop (IR-drop) phenomena occur and laser drilling process margins are insufficient for high-resolution panels
Solution Approach 1:
The patent divides the connection path into multiple segments by introducing an auxiliary electrode and multiple openings (first opening in first insulating film, second opening in pixel defining film, third opening in light emitting layer). This segmentation allows each segment to be optimized independently, reducing overall voltage drop while maintaining manufacturability through standardized process steps applied to each segment.
Solution Approach 2:
The patent transitions from a planar connection structure to a three-dimensional stacked structure with multiple metal layers (first metal layer, second metal layer, third metal layer) and corresponding insulating films. This vertical dimensionality allows shorter horizontal current paths, reducing IR-drop, while the layered architecture remains compatible with existing semiconductor manufacturing processes.
2Manufacturing precision
If the laser drilling process is used for high-resolution panels, then connection precision can be improved, but the process margin becomes insufficient due to voltage drop and structural constraints
Solution Approach 1:
The patent performs preliminary actions by pre-forming the auxiliary electrode in the second metal layer and creating the first opening in the first insulating film before the laser drilling process. This preliminary structure establishment provides a stable foundation that reduces sensitivity to laser drilling variations, thereby increasing process margin while maintaining high connection precision.
Solution Approach 2:
The patent changes structural parameters by introducing multiple opening sizes and positions (first opening, second opening, third opening) with different dimensions and orientations. These parameter variations allow optimization of both laser drilling precision and voltage drop reduction, creating sufficient process margin for high-resolution panel manufacturing.
Data Source
AI summary
A display device includes light emitting elements including a first electrode disposed in a second metal layer, a second electrode disposed in a third metal layer, and a light emitting material disposed in a light emitting layer. A first metal layer includes a first voltage line providing a first voltage to the second electrode, an insulating film includes a first opening extending to a surface of the first voltage line, the second metal layer includes an auxiliary electrode connected to the first voltage line through the first opening, a pixel defining film includes a second opening extending to a surface of the auxiliary electrode, the light emitting layer includes a third opening extending to the surface of the auxiliary electrode, the second electrode is connected to the auxiliary electrode through the second opening and the third opening, and the first and third openings overlap the second opening.