Organic EL Display Common Electrode Segmentation for Potential Uniformity
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Solution Overview
Problem
As the resolution of organic EL display devices increases, the narrow interval between adjacent pixels makes it difficult to maintain uniform electric potential for the common electrode, leading to reduced brightness in the display area.
Innovation Solution
A display device structure is implemented with a contact area adjacent to each pixel, featuring a pixel electrode, a common electrode, an auxiliary conductive layer, and a contact hole that electrically connects the common electrode to the auxiliary conductive layer, reducing the electric resistance and maintaining uniform electric potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of organic EL display device is increased, then the display quality is improved, but the interval between adjacent pixels becomes narrow making it difficult to suppress the decrease in electric potential of common electrode
Solution Approach 1:
The invention divides the common electrode into multiple segments by introducing auxiliary electrodes between adjacent pixels. These auxiliary electrodes are electrically connected to the common electrode through contact holes, creating a segmented structure that reduces the overall electric resistance. This segmentation allows each segment to maintain electric potential more effectively, solving the problem of potential decrease in high-resolution displays where pixel intervals are narrow.
Solution Approach 2:
The auxiliary electrodes serve as intermediary elements between the common electrode and the pixel electrodes. By introducing these intermediate conductive structures and connecting them through contact holes, the invention creates additional electrical pathways that mediate the potential distribution, thereby reducing the electric resistance of the common electrode without requiring larger pixel intervals.
2Reliability
If auxiliary electrode is provided between two adjacent pixels to suppress reduction of electric potential, then the electric potential uniformity is improved, but the device structure becomes complex and difficult to implement at high resolution
Solution Approach 1:
The auxiliary electrodes are merged with the existing common electrode structure through electrical connection via contact holes. This integration allows the auxiliary electrodes to function as an extension of the common electrode rather than as separate, complex additions. The merged structure maintains electric potential uniformity while avoiding the complexity of completely independent auxiliary electrode systems.
Solution Approach 2:
The auxiliary electrodes serve multiple functions: they act as extensions of the common electrode to reduce electric resistance, provide additional electrical pathways, and maintain potential uniformity across the display. This multi-functionality reduces the need for additional specialized structures, thereby simplifying the overall device design while achieving high-resolution compatibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This structure ensures uniform electric potential and high resolution by reducing the electric resistance of the common electrode, even as the interval between pixels decreases, thereby maintaining display quality.
Implementation Method 1
a contact hole provided in the contact area and electrically connecting the common electrode and the auxiliary conductive layer
Data Source
AI summary
A sub-pixel is provided in a display area of an organic EL display device. A bank layer surrounds an outer periphery of the sub-pixel. A contact area is positioned in the display area and is adjacent to the sub-pixel through the bank layer. A pixel electrode is provided in the sub-pixel. A common electrode is disposed across the sub-pixel and the contact area. At least a part of an auxiliary conductive layer is positioned in the contact area. A contact hole is provided in the contact area and electrically connects the common electrode and the auxiliary conductive layer.