Emissive Display Transistor Layout to Prevent Source-Drain Shorts
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Solution Overview
Problem
Existing emissive display devices face challenges in forming transistors with stable shapes, which affects the overall performance and reliability of the display device.
Innovation Solution
A display device is designed with a transistor structure that includes a semiconductor layer with specific regions and a metal layer, where the metal layer overlaps the channel region and is spaced apart from the first region, and a driving voltage line that overlaps the first region, ensuring a stable transistor shape and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal layer is disposed to overlap the semiconductor layer completely, then the electrical connection is improved, but the risk of short circuit between source and drain increases
Solution Approach 1:
The metal layer is positioned to overlap only with the channel region of the semiconductor layer, not the source or drain regions. This local differentiation allows electrical connection through the channel while preventing short circuits by maintaining spacing from the source and drain electrodes, thus achieving both reliability and harm prevention
2Area of stationary object
If the driving voltage line is positioned close to the semiconductor layer for compact design, then the device area is reduced, but the risk of interference and short circuit increases
Solution Approach 1:
The driving voltage line is positioned in a different spatial arrangement relative to the semiconductor layer, utilizing vertical layering and strategic horizontal positioning to maintain compact device area while ensuring sufficient spacing to prevent interference and short circuits, thus resolving the contradiction between miniaturization and reliability
3Ease of manufacture
If the transistor structure is simplified for easier manufacturing, then the manufacturing cost is reduced, but the stability of transistor shape deteriorates
Solution Approach 1:
The transistor structure is segmented into distinct functional regions (source, drain, channel) with clearly defined boundaries and spacing relationships. The metal layer and driving voltage line are positioned in specific regions, creating a segmented layout that maintains shape stability while remaining manufacturable through standard fabrication processes
Data Source
AI summary
A display device includes a metal layer disposed on a substrate; a transistor disposed on the metal layer; and a light emitting element electrically connected to the transistor, wherein the transistor includes a semiconductor layer at least partially overlapping the metal layer, the semiconductor layer includes a first region, a second region, and a channel region disposed between the first region and the second region, and the metal layer overlaps the second region and the channel region and is spaced apart from the first region in a plan view.