Transparent Electrode Design for High Aperture Ratio Displays
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Solution Overview
Problem
Current display devices face challenges in achieving high aperture ratios while maintaining low manufacturing costs, particularly in mobile electronic devices where increased definition leads to decreased pixel aperture ratios and increased power consumption.
Innovation Solution
A semiconductor device with a TFT substrate design that includes a gate electrode, oxide semiconductor layer, source and drain electrodes, and transparent electrodes, where the oxide semiconductor layer and first transparent electrode are formed from the same oxide film, and the second transparent electrode overlaps with the first transparent electrode through a dielectric layer, allowing for a simpler manufacturing process and increased aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the definition of liquid crystal display devices is increased, then the display quality is improved, but the pixel aperture ratio decreases
Solution Approach 1:
The patent combines the pixel electrode and storage capacitor electrode functions into a single transparent electrode layer, eliminating the need for separate non-transparent electrodes. This merging allows the storage capacitor to be formed within the transparent electrode structure itself, maintaining high aperture ratio while supporting high definition displays.
Solution Approach 2:
The transparent electrode serves multiple functions simultaneously: it acts as both the pixel electrode for display operation and the storage capacitor electrode for voltage retention. This multi-functionality reduces the number of required electrode layers and maintains transparency while enabling high definition performance.
2Ease of manufacture
If the aperture ratio of liquid crystal display devices is decreased, then the manufacturing cost is reduced, but the luminance and power consumption are adversely affected
Solution Approach 1:
By merging the pixel electrode and storage capacitor electrode into a single transparent electrode structure, the patent eliminates the need for additional non-transparent electrode layers and complex manufacturing steps. This simplification reduces manufacturing cost while maintaining high aperture ratio, which in turn reduces power consumption requirements.
Solution Approach 2:
The patent uses transparent conducting materials that maintain optical transparency while providing electrical conductivity. This allows the electrode structure to remain visually transparent, maintaining high aperture ratio without increasing manufacturing complexity or power consumption.
3Ease of manufacture
If non-transparent materials are used for TFT and storage capacitor, then the manufacturing process is simplified, but the aperture ratio is reduced
Solution Approach 1:
The patent employs transparent conducting materials such as ITO (indium tin oxide) or IZO (indium zinc oxide) instead of traditional non-transparent metals. These materials provide the necessary electrical conductivity while maintaining optical transparency, allowing simplified manufacturing processes to be combined with high aperture ratio performance.
Solution Approach 2:
The patent uses composite oxide semiconductor materials (such as IGZO - indium gallium zinc oxide) that combine the benefits of transparency with semiconductor properties. This composite material approach enables the creation of transparent electrodes and active layers that simplify manufacturing while maintaining high aperture ratio.
Data Source
AI summary
This semiconductor device (100A) includes: a substrate (2); a gate electrode (3) formed on the substrate (2); a gate insulating layer (4) formed over the gate electrode (3); an oxide semiconductor layer (5) formed on the gate insulating layer (4); source and drain electrodes (6s, 6d) electrically connected to the oxide semiconductor layer (5); a first transparent electrode (7) electrically connected to the drain electrode (6d); an interlayer insulating layer (8) including a dielectric layer (8a) formed over the source and drain electrodes (6s, 6d); and a second transparent electrode (9) formed on the interlayer insulating layer (8). At least a portion of the second transparent electrode (9) overlaps with the first transparent electrode (7) with the dielectric layer (8a) interposed between them, and the oxide semiconductor layer (5) and the first transparent electrode (7) are formed out of the same oxide film.