OLED Reflective Film and Power Supply Integration
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Solution Overview
Problem
Conventional organic electroluminescent display devices experience voltage drops due to high resistance in power supply lines and are prone to shorts between adjacent wirings when used as power supply lines.
Innovation Solution
Simultaneously forming a reflective film and a power supply element using a low resistance metal on the same layer, with an insulating layer separating them to prevent shorts and reduce voltage drops, and forming the power supply element in a linear or grid structure to distribute voltage effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If source and drain electrodes are used as power supply lines, then the device structure is simplified, but voltage drop increases due to high resistance
Solution Approach 1:
The patent merges the power supply element function with the reflective film by forming both simultaneously using the same low resistance metal layer. This integration eliminates the need for separate power supply lines, simplifying the device structure while ensuring low resistance through the combined functional element design.
2Device complexity
If source and drain electrodes are used as power supply lines, then the device structure is simplified, but short circuit risk increases between adjacent wirings
Solution Approach 1:
The patent extracts the power supply element from the conventional source/drain electrode structure and forms it as a separate, dedicated element using low resistance metal. This separation allows for optimized design with proper insulation and spacing, reducing short circuit risk while maintaining structural simplicity.
Solution Approach 2:
The patent introduces an insulating layer as an intermediary between the power supply element and adjacent wirings. This mediator provides electrical isolation, preventing short circuits while allowing the power supply element to maintain its simplified integrated structure.
3Ease of manufacture
If conventional metal layers are used for reflective film and power supply, then manufacturing steps are reduced, but resistance increases causing voltage drop
Solution Approach 1:
The patent changes the material parameter by using low resistance metal for the power supply element, fundamentally altering the electrical resistance characteristic. This parameter change enables simultaneous achievement of low resistance performance and manufacturing efficiency through the integrated formation process.
Data Source
AI summary
The present invention relates to an organic electroluminescent display device for preventing a voltage drop and a short between power supply elements by simultaneously forming a reflective film and a power supply element using a low resistance metal. The invention provides an organic electroluminescent display device comprising gate lines, data lines and a power supply element formed on an insulating substrate, a pixel region limited by the gate lines, the data lines and the power supply element, and pixels arranged on the pixel region and comprising of a reflective film and a pixel electrode, wherein the reflective film is formed on the same layer as the power supply element.