Segmented Annular Wiring for OLED Short Circuit Repair
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Solution Overview
Problem
Organic electroluminescent display devices face issues with short circuits between lead wiring and annular auxiliary wiring, leading to unstable light emission and reduced secular stability due to foreign matter or pattern abnormalities, which complicates the manufacturing process.
Innovation Solution
The implementation of multiple pieces of annular wiring that enclose the display region, allowing for easy disconnection of short-circuit parts between lead wiring and annular wiring, maintaining normal wiring function with remaining annular wiring, and incorporating a second insulating film with groove patterns to prevent water infiltration and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If annular auxiliary wiring is formed to enclose the display region, then the connection area between the upper electrode and auxiliary wiring is increased, but lead wiring and annular auxiliary wiring cross each other causing short circuits due to foreign matter or pattern abnormalities
Solution Approach 1:
The patent divides the single annular auxiliary wiring into multiple separate wiring patterns (first annular wiring, second annular wiring, etc.). This segmentation reduces the risk that a single short circuit will affect the entire display region, as each annular wiring pattern provides redundant connection paths to the upper electrode.
2Ease of repair
If multiple pieces of annular wiring are provided to prevent short circuits, then repairability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the annular auxiliary wiring into multiple independent patterns that can be selectively disconnected or repaired. When a short circuit occurs in one pattern, other patterns remain functional, allowing the device to continue operating with reduced performance until repair is performed.
Solution Approach 2:
The patent incorporates redundant annular wiring patterns as a preventive measure against short circuits. This redundancy acts as a cushion against potential failures, ensuring that if one wiring pattern fails, the display device can still function through the remaining patterns, thereby cushioning the impact of the short circuit on overall device functionality.
3Ease of manufacture
If a single annular auxiliary wiring is used, then the manufacturing process is simpler, but the margin for manufacturing process is reduced
Solution Approach 1:
The patent divides the annular auxiliary wiring into multiple separate patterns formed in different layers or at different stages. This segmentation allows for greater flexibility in the manufacturing process, as each pattern can be independently adjusted and optimized without affecting the entire wiring structure, thereby increasing the process margin.
Data Source
AI summary
A display device includes lead wiring drawn out from a display region to a peripheral region of the display region; a first insulating film covering the lead wiring disposed on a substrate; a plurality of pieces of annular wiring disposed in a state of enclosing the display region in a multiple manner between the display region and the peripheral region on the first insulating film; a second insulating film covering the annular wiring disposed above the substrate, and having a groove pattern having each of the pieces of annular wiring as a bottom surface; and a light emitting element disposed on the second insulating film within the display region.