Adjustable Array Substrate for TFT Threshold Voltage Control
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Solution Overview
Problem
In active matrix display panels, the threshold voltage of thin film transistors (TFTs) is fixed during fabrication, making it difficult to adjust after manufacturing, leading to potential operational issues due to differences in threshold voltages between TFTs of varying sizes, such as those in pixel and gate driver on array (GOA) areas.
Innovation Solution
The array substrate incorporates substrate electrodes on either side of TFTs, allowing for the adjustment of threshold voltages using adjustment voltages, with an open circuit between them, enabling the TFTs to operate at ideal states by employing the substrate bias effect, even if the threshold voltage deviates due to manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the threshold voltage of TFTs is fixed during fabrication, then the manufacturing process is simple, but it is difficult to adjust the threshold voltage after manufacturing, leading to operational issues
Solution Approach 1:
The substrate electrode is divided into multiple independent electrode regions, each corresponding to different transistor areas (display area and non-display area). This segmentation allows different voltage adjustments to be applied to different regions, enabling independent threshold voltage control for transistors in different areas while maintaining a unified manufacturing process.
Solution Approach 2:
The patent transforms the fixed threshold voltage characteristic into a dynamic, adjustable parameter by introducing substrate electrodes that can receive different voltage signals. This allows the threshold voltage to be dynamically adjusted after manufacturing to compensate for process variations and ensure optimal transistor performance.
2Reliability
If different threshold voltages are required for TFTs in display and non-display areas, then circuit performance can be optimized, but the manufacturing precision requirement increases
Solution Approach 1:
Different electrode regions are designed with different electrical characteristics to match the specific requirements of transistors in different areas. The display area electrode region and non-display area electrode region can be configured with different dimensions, positions, and voltage levels, allowing local optimization of transistor performance without requiring high precision across the entire substrate.
Solution Approach 2:
The patent changes the electrical parameters of the substrate electrode (such as voltage level, electrode area, or electrode position) to achieve different threshold voltage adjustments. By varying these parameters, the system can accommodate different circuit performance requirements in different areas while using standard manufacturing processes.
3Adaptability or versatility
If substrate electrodes are added to adjust threshold voltages, then threshold voltage control is improved, but the device complexity increases
Solution Approach 1:
The substrate electrode is designed to serve multiple functions: it acts as both a threshold voltage adjustment mechanism and a structural component of the transistor device. By integrating the electrode directly into the substrate structure, the patent avoids adding separate adjustment components, thereby reducing overall device complexity while maintaining adjustability.
Solution Approach 2:
The substrate electrode is merged with the existing substrate structure rather than being added as a separate component. This integration approach combines the electrode function with the substrate's structural role, reducing the number of discrete parts and simplifying the overall device architecture while enabling threshold voltage adjustment.
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 solution allows for the adjustment of threshold voltages of TFTs in display and non-display areas, ensuring optimal operation of pixel and GOA driving circuits, improving manufacturing process control and circuit performance by aligning threshold voltages with desired values.
Implementation Method 1
allowing for the adjustment of threshold voltages using adjustment voltages, with an open circuit between them, enabling the TFTs to operate at ideal states by employing the substrate bias effect
Data Source
AI summary
An array substrate, including: a base substrate including a display area and a non-display area; a first transistor in the display area; a second transistor in the non-display area; and a substrate electrode, the substrate electrode including: a first substrate electrode between the first transistor and the base substrate; and a second substrate electrode between the second transistor and the base substrate, wherein the first substrate electrode and the second substrate electrode are configured to adjust threshold voltages of the first transistor and the second transistor, respectively, there is an open circuit between the first substrate electrode and the second substrate electrode, the first substrate electrode is supplied with a first adjustment voltage, the second substrate electrode is supplied with a second adjustment voltage, and an absolute value of the first adjustment voltage is different from an absolute value of the second adjustment voltage.