Organic EL Display Electrode Integration for Mask Reduction
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Solution Overview
Problem
The existing organic electroluminescence display devices with multi-layer structures require a large number of photolithography processes, increasing the cost and complexity of fabrication due to their intricate thin film patterns.
Innovation Solution
A method is introduced to reduce the number of processes by forming the first electrode and first power line on the same layer, using a double-layer structure of transparent electrodes and conductive layers, and optimizing the insulating layers to simplify the fabrication process while maintaining the stability of the storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer structure with intricate thin film patterns is used, then the device performance is improved, but the number of photolithography processes increases
Solution Approach 1:
The patent merges the formation of the first electrode and first power line into the same layer, and combines the transparent electrode layer and conductive layer into a single structural unit. This integration reduces the number of separate photolithography processes required while maintaining the functional performance of the device.
Solution Approach 2:
The dual-layer structure of transparent electrode and conductive layer serves multiple functions simultaneously: the transparent electrode provides both optical transparency and electrical conductivity, while the conductive layer enhances electrical performance. This multi-functional design reduces the need for separate dedicated layers for each function, thereby reducing process steps.
2Reliability
If a multi-layer structure with intricate thin film patterns is used, then the device performance is improved, but the fabrication cost increases
Solution Approach 1:
By combining the first electrode and first power line formation into a single layer and integrating the transparent electrode and conductive layer, the patent reduces the total number of fabrication steps. This directly lowers manufacturing costs by reducing material waste, process time, and equipment usage while preserving device performance.
3Productivity
If the number of masks and photolithographic processes is reduced, then the fabrication efficiency is improved, but the stability of storage capacitor may be compromised
Solution Approach 1:
The patent segments the insulating layer into multiple distinct layers (second insulating layer, third insulating layer, fourth insulating layer) with specific functions. This segmentation allows each layer to be optimized for its specific role in capacitor stability while being formed through integrated processes that reduce overall fabrication steps.
Solution Approach 2:
Different insulating layers are applied with different local qualities and properties tailored to specific regions and functions. The second insulating layer provides base insulation, the third insulating layer enhances capacitor stability, and the fourth insulating layer provides protective coverage. This localized optimization maintains capacitor stability while reducing total process steps.
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 approach reduces the number of masks and photolithographic processes, stabilizes the storage capacitor, and enhances the aperture ratio, leading to a more cost-effective and efficient fabrication of organic electroluminescence display devices.
Implementation Method 1
An electroluminescence device is a spontaneous light emitting device for emitting light by electrically exciting a fluorescent organic compound
Data Source
AI summary
An organic electroluminescence display device and a method for fabricating the same is described. The organic electroluminescence display device comprises pixels defined by a gate line and a data line perpendicular to the gate line, a switching device and a driving device formed in the unit pixel, a first power line, a transparent electrode layer and a conductive electrode layer for supplying a driving signal to the driving device, a storage electrode overlapped with the first power line such that an insulating layer is interposed therebetween, and an organic electroluminescence layer.