Array Substrate With Shared Gate Electrode for Dual-TFT Aperture Ratio
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Solution Overview
Problem
TFT-LCDs face challenges in achieving faster responding speed and higher charging efficiency as the resolution ratio and size increase, with existing Dual-TFT structures increasing the area occupied by thin film transistor switches and reducing the aperture opening ratio.
Innovation Solution
The proposed array substrate design includes a base substrate with a first and second active layer, insulating layers, gate and drain/source electrodes, and a pixel electrode, where the first and second drain/source electrodes are electrically connected, allowing a single gate electrode to control two channels without increasing the area occupied by thin film transistor switches and reducing the aperture opening ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dual-TFT structure is used to improve charging efficiency and responding speed, then the charging efficiency and responding speed are improved, but the area occupied by thin film transistor switches increases and the aperture opening ratio decreases
Solution Approach 1:
The patent merges two TFT structures into a shared configuration where a single gate electrode controls two channels (first and second active layers). The drain electrodes and source electrodes are electrically connected between the two active layers, allowing one TFT to serve dual purposes. This merging reduces the total area occupied by TFT switches while maintaining the charging efficiency benefits of dual-channel control.
Solution Approach 2:
The gate electrode is designed to universally control both the first and second active layers simultaneously. The drain and source electrodes serve multiple functions by being electrically connected to both active layers, enabling a single TFT structure to perform the work of what would traditionally require two separate TFTs. This multi-functionality increases the aperture opening ratio while preserving charging efficiency.
2Speed
If a dual-TFT structure is used to improve responding speed, then the responding speed is improved, but the area occupied by thin film transistor switches increases
Solution Approach 1:
The patent combines two TFT structures into a shared configuration where a single gate electrode controls two channels. The drain electrodes and source electrodes are electrically connected between the first and second active layers, allowing one TFT to serve dual purposes. This merging reduces the total area occupied by TFT switches while maintaining the responding speed benefits of dual-channel control.
Solution Approach 2:
The gate electrode is designed to universally control both the first and second active layers simultaneously. The drain and source electrodes serve multiple functions by being electrically connected to both active layers, enabling a single TFT structure to perform the work of what would traditionally require two separate TFTs. This multi-functionality reduces the area occupied by thin film transistor switches while preserving responding speed.
3Area of stationary object
If the aperture opening ratio is increased to improve display area, then the display area is increased, but the charging efficiency and responding speed decrease
Solution Approach 1:
The patent merges two TFT structures into a shared configuration that reduces the area occupied by TFT switches. By electrically connecting the drain and source electrodes between two active layers and using a shared gate electrode, the design increases the aperture opening ratio while maintaining dual-channel charging capability, thus preserving charging efficiency despite the increased display area.
Solution Approach 2:
The gate electrode is designed to universally control both the first and second active layers simultaneously. This multi-functionality allows the TFT structure to maintain charging efficiency while occupying less area, thereby increasing the aperture opening ratio and display area without sacrificing charging performance.
4Area of stationary object
If the aperture opening ratio is increased to improve display area, then the display area is increased, but the responding speed decreases
Solution Approach 1:
The patent combines two TFT structures into a shared configuration that reduces the area occupied by TFT switches, thereby increasing the aperture opening ratio. The electrical connection between drain and source electrodes across two active layers maintains dual-channel control capability, preserving responding speed despite the increased display area.
Solution Approach 2:
The gate electrode is designed to universally control both the first and second active layers simultaneously. This multi-functionality allows the reduced TFT area to maintain responding speed performance while increasing the aperture opening ratio and display area.
Data Source
AI summary
An array substrate and a display device are provided. The array substrate includes a base substrate; a first active layer, located on the base substrate; a first insulating layer, located on the first active layer and the base substrate; a gate electrode, located at a side of the first insulating layer away from the first active layer; a second insulating layer, located on the gate electrode and the first insulating layer; a second active layer, located on the second insulating layer away from the gate electrode; a first drain electrode and a first source electrode, being in partial contact with the first active layer, respectively; a second drain electrode and a second source electrode, being in partial contact with the second active layer, respectively; and a pixel electrode, the first drain electrode and the second drain electrode are electrically connected, the first source electrode and the second source electrode are electrically connected, and the pixel electrode is electrically connected with at least one of the first drain electrode and the second drain electrode. The array substrate can improve the responding speed and charging efficiency, and avoid increasing the aperture opening ratio at the same time.