Capacitor Electrode Positioning for High Aperture Ratio in Display Panels
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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 first insulating layer between the gate and channel, with a second insulating layer covering it and the drain, reducing the capacitor area and preventing 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 repositioned from a planar expansion approach to a three-dimensional configuration utilizing multiple insulating layers. The capacitor electrode is disposed on the first insulating layer between the gate and channel, with the second insulating layer covering it, creating a stacked structure that increases capacitance without occupying additional pixel area.
2Area of stationary object
If the capacitor electrode is positioned to increase aperture ratio, then the aperture ratio is improved, but the loading increases due to overlap with data line
Solution Approach 1:
The capacitor electrode is positioned in a specific local region of the pixel structure - on the first insulating layer between the gate and channel - rather than in the conventional position below the data line. This localized positioning avoids overlap with the data line, preventing increased loading and power consumption while maintaining high aperture ratio.
3Area of stationary object
If the capacitor electrode area is reduced to maintain aperture ratio, then the aperture ratio is improved, but the capacitance is reduced
Solution Approach 1:
The patent employs a composite multi-layer insulating structure consisting of the first insulating layer, capacitor electrode, and second insulating layer. This composite configuration allows the capacitor to achieve sufficient capacitance in a compact form factor by utilizing the dielectric properties of multiple layers rather than relying on a single large-area electrode.
Data Source
AI summary
A display panel having a display region and a non-display region is provided. The display panel includes a plurality of pixel structures in the display region, and each pixel structure includes a scan line, a data line, a first active device, a pixel electrode, a first insulating layer, a capacitor electrode, and a second insulating layer. The first active device includes a first gate, a first channel, a first source, and a first drain. The second insulating layer covers the first insulating layer and the capacitor electrode and is located between the capacitor electrode and the first drain. At least one driving circuit is disposed in the non-display region and includes at least one second active device. Hence, a relatively thin insulating layer can be disposed between the capacitor electrode and the drain to reduce the area of the capacitor region and to achieve a desired aperture ratio.