Thin Film Transistor Substrate Oblique Electrode Aperture Ratio
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Solution Overview
Problem
The aperture ratio of display apparatuses decreases as resolution increases due to the limitations of light shielding layers in liquid crystal display devices, affecting the efficiency of light irradiation for image display.
Innovation Solution
A thin film transistor substrate design with oblique portions in the drain and source electrodes, reducing the length of thin film transistors in the second direction and enhancing the aperture ratio by optimizing the shape of the channel region, allowing for improved light irradiation and display efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution of the display apparatus is increased, then image quality is improved, but the aperture ratio gradually decreases
Solution Approach 1:
The drain and source electrodes are designed with oblique portions that extend in directions between the first direction (gate line direction) and the second direction (data line direction). This three-dimensional spatial arrangement allows the electrodes to cover more area diagonally, effectively increasing the aperture ratio without compromising the transistor's functional dimensions in the primary directions.
Solution Approach 2:
The electrodes incorporate oblique portions that create angled or curved boundaries rather than straight rectangular edges. This geometric modification allows the electrodes to pack more efficiently within the pixel area, reducing wasted space and increasing the light-transmissive aperture ratio while maintaining electrical functionality.
2Area of stationary object
If the length of thin film transistors in the second direction is reduced, then the aperture ratio is enhanced, but the transistor channel length may be insufficient
Solution Approach 1:
The oblique portions of the drain and source electrodes extend in directions between the first and second directions, utilizing the diagonal space within the pixel. This allows the transistor channel to achieve sufficient effective length for proper operation while the overall footprint in the second direction remains reduced, thereby enhancing the aperture ratio.
Solution Approach 2:
The drain and source electrodes feature asymmetric oblique portions with specific angles (30°-60°) relative to the gate line direction. This asymmetric design optimizes the electrode layout to maximize the aperture area while maintaining adequate channel length through the angled configuration, resolving the contradiction between compact size and functional performance.
Data Source
AI summary
A thin film transistor substrate includes a substrate and thin film transistors arranged in first and second directions above the substrate. Each thin film transistor includes a gate electrode, a drain electrode, a source electrode and a semiconductor layer. The drain electrode is above the gate electrode and includes a first drain oblique portion and a second drain oblique portion extending from an end portion of the first drain oblique portion. The source electrode is spaced apart from the drain electrode above the gate electrode and includes a first source oblique portion and a second source oblique portion extending from an end portion of the first source oblique portion. The semiconductor layer at least partially overlaps the gate electrode and includes a drain region to which the drain electrode is connected, a source region to which the source electrode is connected, and a channel region therebetween.