Organic EL Display Panel Cathode Connection via Recessed Conductor
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Solution Overview
Problem
In organic EL display panels, the connection between the cathode electrode layer and auxiliary electrode is insufficient, leading to variations in potential, resulting in poor image quality due to insufficient power supply to pixels far from the power source.
Innovation Solution
An organic EL display panel design where the cathode electrode layer is connected to a conductor layer with a recess, featuring a coated section covered by the organic layer and an exposed section that is not, allowing for continuous sharing among pixels and improved power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cathode electrode layer is formed across the surface of the substrate and pixels share the cathode electrode layer, then the device complexity is reduced, but the connection between the cathode electrode layer and auxiliary electrode becomes insufficient, leading to variation in potential
Solution Approach 1:
The patent introduces a recess structure in the conductor layer, transforming a planar connection into a three-dimensional structure. The recess allows the cathode electrode layer to be connected to the auxiliary electrode through a vertical dimension, enhancing connection reliability while maintaining the shared cathode electrode layer configuration across pixels.
Solution Approach 2:
The patent introduces an organic layer as an intermediary between the cathode electrode layer and the conductor layer with recess. This intermediary layer facilitates reliable electrical connection while allowing the cathode electrode layer to maintain its continuous structure across multiple pixels, resolving the contradiction between simplicity and connection reliability.
2Power
If the cathode electrode layer is formed with low resistance to supply sufficient power to distant pixels, then the power supply is improved, but the connection between cathode electrode layer and auxiliary electrode becomes insufficient, causing potential variation
Solution Approach 1:
The recess structure in the conductor layer creates a three-dimensional connection path that reduces resistance between the cathode electrode layer and auxiliary electrode. This dimensional change allows for lower resistance while maintaining stable connection, enabling sufficient power supply to distant pixels without potential variation.
Solution Approach 2:
The patent changes the geometric parameters of the conductor layer by introducing a recess, which alters the electrical resistance parameter. This parameter change enables the cathode electrode layer to maintain low resistance for power supply while ensuring stable connection through the recess structure.
3Power
If the cathode electrode layer is connected to auxiliary electrode to lower resistance, then the power supply to distant pixels is improved, but the connection becomes insufficient, resulting in potential variation and poor image quality
Solution Approach 1:
The recess structure transforms the connection from a planar interface to a three-dimensional structure, improving connection precision. The vertical walls of the recess provide a larger contact area and more precise alignment between the cathode electrode layer and auxiliary electrode, ensuring reliable connection while maintaining power supply efficiency.
Solution Approach 2:
The organic layer acts as a precise intermediary that fills the recess structure, ensuring accurate positioning and connection between the cathode electrode layer and auxiliary electrode. This intermediary enables precise manufacturing while maintaining low resistance and stable power supply.
Data Source
AI summary
The pixels of an organic EL display panel each include an anode electrode layer, an organic layer, and a cathode electrode layer. Each of the organic layer and the cathode electrode layer is shared by the plurality of pixels. An organic EL element in each of the pixels includes an anode section, a cathode section, and a light emitting section. A conductor layer having a recess is provided in a region outside a region of the organic EL element in a view from a light exiting direction in which the organic EL element emits light. The recess includes a coated section that is covered with the organic layer and a conductor exposed section where the conductor layer is exposed. The cathode electrode layer is connected to part of the conductor exposed section.