Double-Gate TFT Structure for High-Current Display Driving
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Solution Overview
Problem
Conventional oxide TFTs with a top-gate structure face issues in providing large-current gate and data signals, leading to low mobility and instability, which can cause circuit burnout and voltage limitations in gate driving areas.
Innovation Solution
A display device with a double-gate structure is implemented, featuring a first signal wire connected to a gate layer and a second signal wire connected to a metal layer, forming a stable transistor device that can handle large currents without burning out, enhancing mobility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large-current gate signals or data signals are provided to improve mobility, then mobility of the active layer is improved, but driving circuits will be burned out due to overly-large currents
Solution Approach 1:
The gate control is segmented into two independent gates: the top gate (gate layer) and the bottom gate (first metal layer). Each gate can be controlled separately through dedicated signal wires, allowing the current to be divided and controlled through different paths. This segmentation enables large-current operation without burning out a single driving circuit, as the current is distributed across multiple gates and signal wires.
2Reliability
If top gate is provided with large-current gate signals to improve mobility, then mobility of the active layer is improved, but driving circuits of gate driving area will be burned out
Solution Approach 1:
The gate control is segmented into two independent gates: the top gate (gate layer) and the bottom gate (first metal layer). Each gate can be controlled separately through dedicated signal wires, allowing the current to be divided and controlled through different paths. This segmentation enables large-current operation without burning out a single driving circuit, as the current is distributed across multiple gates and signal wires.
3Reliability
If shielding layer is provided with large-current data signals to improve mobility, then mobility of the active layer is improved, but driving circuits of gate driving area will be burned out
Solution Approach 1:
The gate control is segmented into two independent gates: the top gate (gate layer) and the bottom gate (first metal layer). Each gate can be controlled separately through dedicated signal wires, allowing the current to be divided and controlled through different paths. This segmentation enables large-current operation without burning out a single driving circuit, as the current is distributed across multiple gates and signal wires.
4Reliability
If maximum voltage value of scan signals is increased to improve performance, then display performance is improved, but driving circuits will be burned out due to overly-large currents
Solution Approach 1:
The gate control is segmented into two independent gates: the top gate (gate layer) and the bottom gate (first metal layer). Each gate can be controlled separately through dedicated signal wires, allowing the current to be divided and controlled through different paths. This segmentation enables large-current operation without burning out a single driving circuit, as the current is distributed across multiple gates and signal wires.
Data Source
AI summary
A display device is provided. A display panel includes a display device. The display device is provided with a gate driving area. The gate driving area is provided with a first transistor device. The first transistor device includes a first signal wire and a second signal wire. The first signal wire is electrically connected to a gate layer. The second signal wire is electrically connected to a first metal layer. Therefore, a double-gate structure, which can provide a large-current gate signal by only the second signal wire, is formed. Or, the double-gate structure can provide a large-current gate signal by both the first signal wire and the second signal wire. As a result, mobility of an active layer is improved.