Dual-Gate Array Substrate Stabilizing Threshold Voltage
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Solution Overview
Problem
Existing liquid crystal display (LCD) array substrates with single gate structures experience instability due to variations in threshold voltage over time, leading to operational issues.
Innovation Solution
A two-gate structure array substrate is designed with a substrate base, source, drain, active layer, and pixel electrode, where the drain and pixel electrode are connected, and the two gates control the conduction and cutoff of the active layer, which in turn controls the conduction and cutoff between the source and drain, incorporating a buffer and passivation layer with specific via configurations to stabilize the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gate structure is used in the array substrate, then the device complexity is reduced, but the threshold voltage stability deteriorates over time
Solution Approach 1:
The single gate structure is segmented into two gates (first gate and second gate) that are disposed at opposite sides of the active layer. This segmentation allows each gate to independently control carrier flow, providing balanced control that prevents threshold voltage shift while maintaining manageable device complexity through symmetric design.
Solution Approach 2:
The two gates are positioned asymmetrically relative to the source and drain regions, with the first gate closer to the source and the second gate closer to the drain. This asymmetric positioning creates different electric field distributions that compensate for stress-induced threshold voltage shifts, improving reliability without requiring complex control circuits.
2Reliability
If a two-gate structure is implemented, then the threshold voltage stability is improved, but the device complexity increases
Solution Approach 1:
Each gate is designed with locally optimized dimensions and positions tailored to its specific function - the first gate optimizes carrier injection from the source, while the second gate optimizes carrier extraction to the drain. This local quality approach allows the two-gate structure to achieve superior threshold voltage stability without uniformly increasing the complexity of the entire device.
Solution Approach 2:
The two gates are merged into a unified dual-gate architecture that works synergistically to control the active layer. By combining the control functions of both gates and integrating them with the source-drain pathway, the structure achieves enhanced reliability while the merged design reduces the number of separate control elements compared to having independently optimized gate structures.
Data Source
AI summary
A display device, an array substrate, and a manufacturing method for the array substrate are disclosed. The array substrate includes a substrate base, and two gates, a source, a drain, an active layer, and a pixel electrode on the substrate base. The drain and the pixel electrode are connected together. The source and the drain contact the active layer, respectively. The two gates control the conduction and cut off of the active layer, which in turn controls the conduction and cut off between the source and the drain. Through the present disclosure, the variation of threshold voltage is effectively prevented.