Concave TFT Structure for High-Density Display Panels
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Solution Overview
Problem
The structural limitations of thin film transistors (TFTs) in display panels occupy a large area, limiting pixel density improvement and risking overheating or burning due to short channel lengths.
Innovation Solution
Incorporating a concave structure in the active layer of TFTs with a floating metal layer in contact with the concave structure, reducing the occupied area while maintaining a sufficient channel length and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TFT device occupies a large area to maintain sufficient channel length, then the reliability is improved, but the area occupied increases reducing pixel density
Solution Approach 1:
The active layer is transformed from a planar structure to a three-dimensional structure with a concave portion. The gate overlaps with the side surface of the concave structure, utilizing the vertical dimension to extend the channel length without increasing the planar footprint. This dimensional transition allows the TFT to maintain sufficient channel length while occupying less area, resolving the contradiction between reliability and area occupation.
2Area of stationary object
If the channel length is reduced to shrink TFT area, then the area occupied decreases improving pixel density, but the TFT device overheats or burns reducing reliability
Solution Approach 1:
By forming the gate to overlap with the side surface of the concave structure, the channel length is extended in the vertical dimension rather than the planar dimension. This allows the TFT area to be reduced for higher pixel density while the channel length remains sufficient to prevent overheating and maintain reliability.
3Quantity of substance
If the TFT area is reduced to improve pixel density, then the quantity of pixels increases, but the heat dissipation becomes insufficient leading to overheating
Solution Approach 1:
The concave structure in the active layer creates additional surface area for heat dissipation. The gate overlapping with the side surface of the concave structure provides extended thermal pathways, allowing heat to dissipate more effectively from the channel region. This enables higher pixel density while maintaining adequate heat dissipation capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances pixel density and display quality by reducing the TFT area, minimizing heat accumulation, and preventing overheating, thus stabilizing TFT performance.
Implementation Method 1
The floating metal layer is in direct contact with at least part of the side surface of the concave structure
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate and an array layer. The array layer includes at least one thin film transistor. One thin film transistor includes an active layer, a gate, a source, and a drain. The active layer is located on the substrate, and includes a concave structure. The concave structure includes a bottom surface and a side surface. The gate is located on a side of the active layer away from the substrate. Along a direction perpendicular to the side surface of the concave structure, at least part of the gate overlaps with the side surface of the concave structure. The array layer includes a floating metal layer between the active layer and the substrate, which is in direct contact with at least part of the side surface of the concave structure.