Thin Film Transistor Heat Discharge Electrode Design
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Solution Overview
Problem
Existing thin film transistors face challenges in efficiently discharging heat, which can lead to reduced lifespan and increased leakage currents, affecting the performance and longevity of display devices.
Innovation Solution
Incorporating a heat discharge electrode connected to the control electrode through a contact hole in the insulating layer, positioned between the input and output electrodes, allows for effective heat dissipation without increasing the transistor's area, using the same material as the input and output electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional thin film transistor structure is used, then the device area is small, but the heat discharge rate is insufficient leading to increased leakage currents and reduced lifespan
Solution Approach 1:
The heat discharge electrode is positioned in the planar dimension between the source and drain electrodes, utilizing the available lateral space rather than adding vertical layers or increasing the overall device footprint. This dimensional approach allows heat dissipation functionality to be integrated without compromising the compact area of the transistor.
Solution Approach 2:
The heat discharge electrode acts as an intermediary thermal pathway between the control electrode (which generates heat) and the surrounding environment. By introducing this intermediate conductive element, heat is efficiently conducted away from the active channel region, preventing heat accumulation that would otherwise increase leakage currents and degrade transistor reliability.
2Temperature
If the transistor area is increased to improve heat dissipation, then the heat discharge rate improves, but the display device pixel density decreases
Solution Approach 1:
Instead of increasing the transistor area in the planar dimension, the solution introduces a new heat discharge pathway that utilizes the lateral space between existing electrodes. The heat discharge electrode is positioned in the gap between source and drain, converting unused inter-electrode space into functional thermal management infrastructure without expanding the overall device footprint.
Solution Approach 2:
The heat discharge electrode serves multiple functions: it provides a thermal conduction pathway for heat dissipation, maintains electrical isolation from the active channel through insulating layers, and utilizes the same material system as other electrodes for manufacturing consistency. This multi-functionality allows efficient heat management without sacrificing pixel density.
3Reliability
If heat discharge is improved, then leakage currents are reduced, but the device structure becomes more complex
Solution Approach 1:
The heat discharge electrode is formed using the same material and deposition process as the source and drain electrodes, merging the thermal management function with the existing electrode fabrication workflow. This consolidation approach adds heat discharge functionality without requiring separate material systems or additional complex manufacturing steps.
Solution Approach 2:
The heat discharge electrode is positioned locally in specific regions between the source and drain electrodes where thermal management is most needed, rather than uniformly covering the entire transistor area. This localized approach provides effective heat dissipation precisely where heat generation occurs from the control electrode, while minimizing structural complexity in other regions.
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
This configuration enhances the heat discharge rate, reducing leakage currents and extending the lifespan of the thin film transistor, enabling improved display quality, particularly in organic light emitting and liquid crystal display devices by maintaining low gray scale levels approximating black during turn-off periods.
Implementation Method 1
a heat discharge electrode on the second insulating layer, the heat discharge electrode being connected to the control electrode
Data Source
AI summary
A thin film transistor includes a semiconductor pattern on a base substrate, the semiconductor pattern including an input area, an output area, and a channel area between the input area and the output area, a first insulating layer covering the semiconductor pattern, a control electrode on the first insulating layer, the control electrode overlapping the channel area, a second insulating layer covering the control electrode, an input electrode connected to the input area, an output electrode connected to the output area, and a heat discharge electrode on the second insulating layer, the heat discharge electrode being connected to the control electrode.