Dual-Gate Semiconductor Circuit for Stable Display Driver Output
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Solution Overview
Problem
Variations in transistor threshold voltage in sequence circuits of driver circuits of display devices lead to failures in outputting desired signals, affecting image display and increasing bezel size and manufacturing costs.
Innovation Solution
A semiconductor device incorporating transistors with overlapping gates and capacitors, where one gate is connected to the source, stabilizes the threshold voltage, enabling reliable and efficient signal output without additional power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sequence circuits are used with single-polarity transistors, then fabrication costs are reduced and manufacturing is simplified, but threshold voltage variations cause signal output failures
Solution Approach 1:
The gate electrode is divided into two separate gates (first gate and second gate) that can be independently controlled. This segmentation allows independent optimization of threshold voltage control and signal drive capability, resolving the contradiction between reliability and complexity by making the threshold voltage controllable without requiring a completely new transistor architecture
Solution Approach 2:
The invention changes the electrical parameters of the transistor by introducing a second gate that can independently control the threshold voltage. By adjusting the voltage applied to the second gate, the threshold voltage can be dynamically tuned to compensate for variations, improving signal output reliability without fundamentally changing the transistor's basic structure
2Length of stationary object
If driver circuits are integrated over the same substrate as pixel portions, then bezel size is narrowed, but threshold voltage variations in sequence circuits affect image display
Solution Approach 1:
The second gate serves as a threshold voltage control terminal that can dynamically adjust the transistor's operating characteristics. By monitoring and adjusting the threshold voltage through the second gate, the circuit maintains reliable signal output even when integrated on the same substrate, ensuring image display reliability while achieving narrowed bezel
3Reliability
If transistors with overlapping gates are used to stabilize threshold voltage, then signal output reliability is improved, but transistor structure and fabrication complexity increase
Solution Approach 1:
The gate is segmented into two independent gates that can be formed using standard multi-layer conductor fabrication techniques. This segmentation approach allows the dual-gate structure to be integrated into existing manufacturing processes without requiring completely new fabrication equipment or methods, thereby maintaining ease of manufacture while achieving threshold voltage stability
Data Source
AI summary
A semiconductor device with high reliability is provided. The semiconductor device includes a first transistor, a second transistor, a capacitor, and first to fourth wirings. The first transistor includes a first gate and a second gate, and one of a source and a drain of the first transistor is connected to the first wiring and the second gate, and the other of the source and the drain is connected to one of a source and a drain of the second transistor and one electrode of the capacitor. A gate of the second transistor is connected to the other electrode of the capacitor, and the other of the source and the drain of the second transistor is electrically connected to the second wiring. The first wiring is supplied with a first potential, and the second wiring is supplied with a second potential and a third potential alternately. The third wiring is connected to the first gate and supplied with a first signal. The fourth wiring is connected to the gate of the second transistor and supplied with a second signal obtained by inverting the first signal.