GOA Control Switch Branch Layout for Uneven-Etching Short-Circuit Prevention
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Solution Overview
Problem
The integration of Gate Driver on Array (GOA) circuits in display panels leads to uneven etching during manufacturing, causing short circuits between the source and drain electrodes due to the shrinking channel distance, which is exacerbated by higher integration levels.
Innovation Solution
The design of a control switch for the driving circuit includes a thin film transistor with parallel source and drain branches, where the source lead extension is positioned between the drain branch and source trunk, preventing overlap and potential short circuits even with uneven etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the degree of integration of GOA circuits is increased, then the channel distance between source and drain is reduced to improve integration, but uneven etching causes source lead to connect to both source and drain electrodes, resulting in short circuit
Solution Approach 1:
The source electrode is divided into multiple source branches (first source branch, second source branch, etc.) arranged in parallel, with each branch independently connected to the source lead. This segmentation ensures that even if uneven etching occurs, the source lead cannot simultaneously connect to multiple branches, preventing short circuits while maintaining high integration
Solution Approach 2:
The source lead is positioned as an intermediary element between the source electrode branches and the external circuit. By strategically locating the source lead extension line between the first drain branch and the source trunk, it acts as a mediator that prevents direct contact between the source and drain electrodes, thereby avoiding short circuits
2Ease of manufacture
If source and drain electrodes are formed by etching in the same layer, then manufacturing process is simplified, but uneven etching occurs causing short circuits
Solution Approach 1:
Different regions of the electrode structure are designed with different local characteristics. The source branches are arranged in parallel with specific spacing from the drain branch, creating local quality differences that prevent uneven etching from causing short circuits. The source lead extension line is locally positioned between the first drain branch and source trunk to provide additional protection
Data Source
AI summary
A control switch of a driving circuit, an array substrate, and a display panel are disclosed. The control switch includes a thin film transistor. In the thin film transistor, the electrode includes at least two source branches, and the drain electrode includes at least one drain branch. Each source branch directly connected to the source lead is a first source branch. Each drain branch adjacent to the first source branch is a first drain branch). An extension of each of the at least one source lead is located between the respective first drain branch and the source trunk.