Bottom Shielding Metal Layout for Larger OLED Emission Regions
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Solution Overview
Problem
The existing electroluminescence display devices have a reduced aperture ratio due to the complexity of the driving circuit, which results in a smaller emission region for subpixels, leading to potential display quality issues and interference between adjacent subpixels.
Innovation Solution
The solution involves connecting the bottom shielding metal to the capacitor electrode in the circuit line area outside the subpixel, allowing for an enlarged emission region and improved design margins, thereby preventing optical interference and ensuring sufficient capacitance of the storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving circuit includes multiple lines and thin film transistors for deterioration compensation, then the driving function is improved, but the area for emission region decreases
Solution Approach 1:
The patent extends the bottom shielding metal and capacitor electrode from the subpixel area into the circuit line area, utilizing the spatial dimension outside the emission region to provide capacitance. This dimensional extension allows the emission region to be enlarged while maintaining the necessary capacitor function through the extended electrode structure in the circuit area.
2Adaptability or versatility
If the subpixel includes multiple lines and thin film transistors, then the driving circuit becomes more functional, but the area occupied by circuit elements increases
Solution Approach 1:
The bottom shielding metal structure serves multiple functions: it acts as a capacitor electrode for charge storage, provides shielding against electrical interference, and extends into the circuit line area to perform capacitance function outside the subpixel. This multi-functionality allows the same structure to serve both shielding and capacitance purposes while utilizing the circuit line area efficiently.
3Area of moving object
If the emission region area is increased, then the aperture ratio is improved, but the area for driving circuit components decreases
Solution Approach 1:
The patent extracts the capacitance function from the subpixel area and places it in the circuit line area through the extended bottom shielding metal and capacitor electrode. This extraction allows the emission region to be maximized within the subpixel while the capacitor function is fulfilled by the extended structure in the circuit area, effectively separating the emission and capacitance functions spatially.
Data Source
AI summary
A display device includes: a substrate having a subpixel and a circuit line area adjacent to the subpixel; a driving transistor in the subpixel; a first bottom shielding metal portion under the driving transistor in the subpixel and a second bottom shielding metal portion in the circuit line area; a first capacitor electrode portion in the subpixel and a second capacitor electrode portion in the circuit line area; and a light emitting diode in the subpixel, wherein the second bottom shielding metal portion is electrically connected to the second capacitor electrode portion in the circuit line area.