OLED Cathode Contact Structure for IR Drop Reduction
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Solution Overview
Problem
Large organic light emitting diode display apparatuses, such as televisions, experience deteriorated display quality due to IR drop of the cathode electrode, requiring additional processes like laser drilling or mask-based photo-processing for auxiliary wire connection, which increases manufacturing costs and complexity.
Innovation Solution
A display apparatus design where the power supply wire, acting as an auxiliary wire, is connected to the second electrode without separate laser drilling or mask-based processes, featuring a protruding third conductive layer forming an undercut on the second conductive layer, allowing direct contact and reducing IR drop while simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate laser drilling or mask-based photo-processing is used for auxiliary wire connection, then connection reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the auxiliary wire connection function into the existing power supply wire structure by forming a protruding portion that directly contacts the cathode electrode. This eliminates the need for separate laser drilling or mask-based photo-processing steps, thereby reducing manufacturing complexity while maintaining connection reliability through the integrated design.
Solution Approach 2:
The protruding portion of the power supply wire is formed in advance during the wire fabrication process, positioned to automatically contact the cathode electrode during assembly. This preliminary positioning eliminates the need for subsequent complex connection processes and ensures reliable electrical connection without additional manufacturing steps.
2Reliability
If separate laser drilling or mask-based photo-processing is used for auxiliary wire connection, then connection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the auxiliary wire connection function with the existing power supply wire fabrication process. The protruding portion is formed during the wire manufacturing process itself, eliminating the need for separate laser drilling or mask-based processing steps, thereby reducing manufacturing cost while maintaining connection reliability.
Solution Approach 2:
The power supply wire structure serves dual functions: it provides power transmission and simultaneously acts as the auxiliary connection to the cathode electrode through its protruding portion. This self-service design eliminates the need for separate auxiliary wire installation processes, reducing manufacturing cost while ensuring reliable connection.
3Ease of manufacture
If conventional power supply wire structure is used, then manufacturing simplicity is maintained, but IR drop of cathode electrode deteriorates display quality
Solution Approach 1:
The protruding portion is formed in advance during the power supply wire fabrication process, positioned to contact the cathode electrode before final assembly. This preliminary action ensures proper electrical connection that prevents IR drop and maintains display quality without complicating the manufacturing process.
Solution Approach 2:
The power supply wire is designed with a protruding portion that extends in a direction perpendicular to the main wire path, creating a three-dimensional structure. This dimensional change allows the wire to contact the cathode electrode from above, preventing IR drop while maintaining manufacturing simplicity through the addition of a single forming step.
Data Source
AI summary
A display apparatus includes: a base substrate; a thin film transistor and a power supply wire on the base substrate; a first electrode on the base substrate, and electrically connected to the thin film transistor; a light emitting layer and a common layer on the first electrode; and a second electrode on the common layer. The power supply wire includes: a first conductive layer; a second conductive layer on the first conductive layer; and a third conductive layer on the second conductive layer. The third conductive layer protrudes more than the second conductive layer on a side surface of the power supply wire, and the second electrode contacts a side surface of the second conductive layer.