Capacitor Electrode Positioning for High Aperture Ratio
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Solution Overview
Problem
In liquid crystal display (LCD) pixel structures, expanding the capacitor electrode to increase capacitance reduces the aperture ratio, leading to increased power consumption due to overlapping with data lines.
Innovation Solution
The capacitor electrode is positioned on the gate insulating layer with a thin capacitor dielectric layer between it and the drain, reducing the capacitor area and avoiding overlap with data lines, thus maintaining a high aperture ratio without increasing loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the capacitor electrode area is expanded to increase capacitance, then the storage capacitor capacitance is improved, but the aperture ratio is reduced
Solution Approach 1:
The capacitor electrode is positioned in the vertical dimension above the gate insulating layer rather than expanding horizontally, utilizing the third dimension to achieve capacitance without sacrificing aperture ratio
Solution Approach 2:
The capacitor electrode structure is nested within the existing pixel structure layers, with the capacitor electrode disposed on the gate insulating layer and the capacitor dielectric layer between it and the drain, efficiently using available space
2Area of stationary object
If the capacitor electrode is located below the data line to increase aperture ratio, then the aperture ratio is improved, but the loading is increased leading to higher power consumption
Solution Approach 1:
The capacitor electrode is extracted from the data line overlapping region and repositioned above the gate insulating layer, removing the harmful overlap that caused increased loading and power consumption while preserving aperture ratio
Solution Approach 2:
The gate insulating layer serves as an intermediary structure that supports the capacitor electrode, enabling the capacitor to be formed without direct overlap with the data line, thus avoiding increased loading
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 design ensures a high aperture ratio while reducing parasitic capacitance and photo current leakage, improving display quality and reducing power consumption.
Implementation Method 1
The capacitor dielectric layer is located between the capacitor electrode and the drain
Implementation Method 2
The capacitor dielectric layer is located between the capacitor electrode and the drain
Data Source
AI summary
An active device, a pixel structure, and a display panel are provided. The pixel structure includes a scan line, a data line, an active device, a gate insulating layer, a pixel electrode, a capacitor electrode, and a capacitor dielectric layer. The active device includes a gate, a channel, a source, and a drain. The gate is electrically connected to the scan line. The source is electrically connected to the data line. The gate insulating layer is disposed between the gate and the channel. The pixel electrode is electrically connected to the drain. The capacitor electrode is located on the gate insulating layer. The capacitor dielectric layer is located between the capacitor electrode and the drain.