Shared Drain Contact Hole Layout for Flatter Display Topography
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Solution Overview
Problem
Existing electronic devices face challenges in achieving high-resolution display quality due to the steep topography caused by excessive drain contact holes, which can lead to cracking and short circuits during the formation of stacked layers.
Innovation Solution
The electronic device design includes a substrate with transistors and drain contact holes, where multiple drains share a single drain contact hole, reducing the number of contact holes and creating a relatively flat topography to prevent cracking and improve the layout of metal lines and thin film transistor units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of drain contact holes is increased to improve electrical connection, then the electrical connection is improved, but the topography becomes steep causing cracking and short circuits
Solution Approach 1:
Multiple drains from different transistors share a common drain contact hole, merging multiple separate contact holes into fewer shared ones. This reduces the overall number of contact holes while maintaining electrical connection functionality, thereby preventing steep topography and associated cracking issues.
2Strength
If the number of drain contact holes is reduced to flatten topography, then the topography becomes flatter preventing cracking, but the electrical connection may be compromised
Solution Approach 1:
A single drain contact hole serves multiple functions by providing electrical connection for multiple drains simultaneously. This multi-functional design allows the contact hole to maintain electrical connectivity for several transistors while reducing the total number of contact holes needed, thus flattening the topography.
3Reliability
If more drain contact holes are used to ensure reliable electrical connection for each drain, then the electrical connection reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple drain contact holes into fewer shared contact holes, reducing the complexity of the contact hole configuration. By having multiple drains share common contact holes, the overall device structure becomes simpler with fewer discrete elements to manufacture and manage.
Data Source
AI summary
An electronic device includes a substrate, a first conductive wire, a plurality of semiconductors, an insulation layer and a plurality of conductive elements. The first conductive wire is configured to transmit a first signal and disposed on the substrate, and the first conductive wire extends along a first direction. The semiconductors are disposed on the substrate and overlapped with the first conductive wire. The insulation layer is disposed on the substrate and has a plurality of holes. The conductive elements are disposed on the substrate and overlapped with the semiconductors respectively. In a top view of the electronic device, each one of the plurality of holes overlaps with at least one semiconductor, and a number of the holes is less than a number of the plurality of conductive elements.