TFT Channel Extension for Aperture Ratio and Charging Current
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Solution Overview
Problem
Conventional thin film transistor liquid crystal display (TFT-LCD) technologies face challenges in achieving sufficient charging current, leading to display failures such as bright spots and gray level non-uniformity, while attempts to increase charging current through channel width-to-length ratio modifications often result in decreased aperture ratio and display quality.
Innovation Solution
The solution involves extending the channel region of the thin film transistor by forming source and drain extension regions, which are connected to the respective electrodes, to increase the width-to-length ratio without reducing the aperture ratio, thereby enhancing the charging current and preventing display failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the channel width-to-length ratio is increased by modifying the channel structure, then the charging current is improved, but the aperture ratio decreases
Solution Approach 1:
The channel is divided into two separate channels, each with its own source and drain electrodes. This segmentation allows the effective channel width to be doubled while maintaining the same physical footprint, thereby increasing charging current without reducing aperture ratio
Solution Approach 2:
The dual-channel structure utilizes spatial arrangement in the planar dimension to achieve increased effective width. By positioning two channels side-by-side sharing common source and drain regions, the design effectively doubles the charge transport capacity without extending the pixel area
2Power
If multiple source and drain electrodes are used to increase channel width, then the charging current is improved, but the device complexity increases
Solution Approach 1:
Two separate channel structures share common source and drain electrode regions. This merging approach allows the effective channel width to be doubled while reusing the same electrode structures, thereby increasing charging current without proportionally increasing the number of electrodes or manufacturing complexity
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 approach efficiently increases the charging current of the TFT pixel region, avoiding display issues like bright spots and gray level non-uniformity while maintaining the aperture ratio, thus improving display quality.
Implementation Method 1
When the gate electrode 1 is at a voltage of high level, induced charges are generated in the semiconductor layer (e.g., an amorphous silicon (a-Si) layer) 3 of the TFT
Implementation Method 2
induced charges are generated in the semiconductor layer
Data Source
AI summary
A thin film transistor for a thin film transistor liquid crystal display (TFT-LCD), an array substrate and manufacturing method thereof are provided. The thin film transistor comprises a source electrode, a drain electrode, and a channel region between the source electrode and drain electrode. A source extension region is connected with the source electrode, a drain extension region is connected with the drain electrode, and the source extension region is disposed opposite to the drain extension region to form a channel extension region therebetween.