Display Panel Contact Area Structure for Resistance Measurement
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Solution Overview
Problem
Existing display devices with organic electroluminescent (EL) elements cannot accurately measure contact resistance between the conductive layer and the terminal, leading to potential issues with light emission and image quality due to poor connections at contact portions.
Innovation Solution
A display panel design with a contact area that includes an upper conductive layer, a middle layer with separate conductive areas, and an insulating layer with specific contact holes, allowing for the measurement of the potential of the conductive layer and the contact resistance between the conductive layer and the terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple terminal structure is used to reduce device complexity, then manufacturing is easier, but the ability to measure conductive layer potential and contact resistance is lost
Solution Approach 1:
The terminal structure is designed to serve multiple functions simultaneously: it provides electrical connection between the power source and the conductive layer, maintains structural integrity, and enables measurement of both line contact resistance and interface contact resistance through integrated measurement electrodes and signal routing paths. This multi-functionality allows measurement capabilities to be built into the terminal without requiring separate complex measurement systems.
2Reliability
If contact resistance at the contact portion is high due to poor connection, then the desired potential cannot be applied to the cathode, but adding measurement and compensation structures increases device complexity
Solution Approach 1:
The terminal structure includes built-in measurement electrodes and signal routing paths that enable self-diagnosis of contact resistance issues. The system can automatically detect high contact resistance at the conductive layer interface through the measurement path and compensate by adjusting the applied potential, allowing the display device to self-monitor and self-correct without requiring external complex measurement equipment or manual intervention.
Data Source
AI summary
A display panel includes a contact area which includes an upper conductive layer forming first electrodes of the organic EL elements, a lower conductive layer disposed below the upper conductive layer, a middle layer between the upper conductive layer and the lower conductive layer, and an insulating layer between the lower conductive layer and the middle layer. The middle layer includes a first area and a second area which are conductive and electrically connected to the upper conductive layer, and an insulating separating area which separates the first area and the second area. The lower conductive layer includes a first line which is electrically connected to the first area via a first contact hole, and a second line which is electrically connected to the second area via a second contact hole.