Driving Circuit Redundant Patterned Member for Etching Uniformity
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Solution Overview
Problem
The electrical performance of the pull-up unit in gate driving circuits is affected by uneven etching of sources and drains in thin-film transistors connected to bootstrap capacitors, leading to suboptimal performance.
Innovation Solution
Incorporating a redundant patterned member in the same conductive layer as the thin-film transistor, connected between the transistor and the capacitor's electrode plate, which includes a dummy thin-film transistor with redundant sources and drains, helps prevent uneven etching by maintaining consistent etching conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the second electrode of the bootstrap capacitor is designed as a whole piece of metal, then the capacitor can be properly formed, but the sources and drains of thin-film transistors connected to it exhibit uneven etching that affects electrical performance
Solution Approach 1:
The patent divides the conductive layer into multiple segmented regions rather than using a continuous whole-piece metal structure. The second electrode of the bootstrap capacitor is segmented into multiple separate conductive regions, which prevents the uneven etching problem while maintaining proper capacitor formation. This segmentation allows each region to be etched uniformly without being influenced by adjacent conductive structures.
Solution Approach 2:
The patent introduces an intermediary insulating layer between the first electrode and the second electrode of the bootstrap capacitor. This insulating layer acts as a mediator that prevents direct electrical connection while allowing the capacitor to function properly. The insulating layer also serves as a barrier that prevents etching diffusion between adjacent conductive regions, ensuring uniform etching across all transistor sources and drains.
2Device complexity
If thin-film transistors are connected to the bootstrap capacitor with a whole-piece metal second electrode, then the capacitor structure is simple, but etching uniformity deteriorates affecting transistor electrical properties
Solution Approach 1:
The patent applies segmentation to the second electrode structure, dividing it into multiple separate conductive regions instead of a single continuous piece. This segmentation increases structural complexity slightly but achieves superior etching uniformity across all transistor sources and drains connected to the capacitor, resolving the trade-off between structural simplicity and manufacturing precision.
Solution Approach 2:
The insulating layer introduced between the electrodes serves as an intermediary that prevents etching interaction between adjacent conductive regions. This intermediary structure enables precise control of etching processes while maintaining proper capacitor functionality, achieving both structural feasibility and manufacturing precision.
Data Source
AI summary
The present application provides a driving circuit and a display device. The driving circuit includes a circuit unit including a thin-film transistor, which includes a patterned member; a capacitor, connected to at least one end of the thin-film transistor of the circuit unit, the capacitor includes an electrode plate; and a redundant patterned member, the redundant patterned member, the electrode plate and the patterned member located in a same conductive layer, the redundant patterned member connected between the patterned member and the electrode plate.