Flat Panel Display Gate Electrode Aperture Ratio
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Solution Overview
Problem
Conventional flat panel display apparatuses face challenges in achieving high aperture ratio and transmissibility, particularly in high-definition displays where low aperture ratio results in relatively low transmissibility.
Innovation Solution
The design includes a gate electrode with a transparent conductive layer and a metallic layer on a substrate, a capacitor first electrode with the same material as the gate electrode, and a semiconductor layer with transparent conductive oxide, along with specific insulating layers and electrode configurations to enhance transmissibility and aperture ratio, utilizing masks for precise layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional structures are used in high-definition displays, then the aperture ratio is reduced, but transmissibility is improved
Solution Approach 1:
The gate electrode and capacitor first electrode are merged into the same structure layer, both extending on the same plane. This integration eliminates the need for separate capacitor structures that would occupy pixel area, thereby improving aperture ratio while maintaining transmissibility through the unified transparent conductive layer design.
Solution Approach 2:
The capacitor second electrode is positioned on the same plane as the semiconductor layer rather than stacking it vertically above the gate electrode. This lateral positioning in the same plane allows light to pass through without vertical obstruction, improving transmissibility while the capacitor functionality is maintained through the insulating layer separation.
2Illumination intensity
If transparent conductive oxide is used in semiconductor layer, then transmissibility is improved, but manufacturing complexity increases
Solution Approach 1:
The transparent conductive oxide layer serves multiple functions simultaneously: it forms the semiconductor layer for transistor operation, creates the capacitor second electrode for charge storage, and maintains optical transparency for light emission. This multi-functionality reduces the need for separate layers, simplifying manufacturing despite the specialized material requirements.
Solution Approach 2:
The patent specifies particular transparent conductive oxide compositions (such as ITO, IZO, ZnO, In2O3, IGO, or AZO) with controlled oxygen and metal content ratios. By optimizing these material parameters, the layer achieves both the required electrical properties for semiconductor and capacitor functions and the optical transparency needed, balancing performance with manufacturability.
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 configuration improves the aperture ratio and transmissibility of flat panel displays by increasing capacitance and reducing parasitic capacitance, eliminating the need for a black matrix between pixels, thereby enhancing display quality and reducing manufacturing costs.
Implementation Method 1
The first insulating layer may have a higher permittivity than the third insulating layer
Data Source
AI summary
A flat panel display apparatus including a gate electrode on a substrate, a first insulating layer and a semiconductor layer sequentially stacked on the gate electrode and including a transparent conductive oxide, a capacitor first electrode extending on a plane on which the gate electrode extends, and a capacitor second electrode extending on a plane on which the semiconductor layer extends and including a material of the semiconductor layer, wherein the first insulating layer is between the capacitor second electrode and the semiconductor layer, source and drain electrodes that are separated by a second insulating layer and are connected to the semiconductor layer and the capacitor second electrode, a third insulating layer covering the source and drain electrodes, and a pixel electrode electrically connected to the source or drain electrode on the third insulating layer and being electrically connected to one of the source electrode and/or the drain electrode.