LTPS Thin Film Transistor Leakage Current Suppression
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Solution Overview
Problem
Low-Temperature Poly-Silicon Thin Film Transistors (LTPS TFTs) face significant challenges in suppressing leakage current, which results in reduced yield ratios and are not suitable for low power consumption display technologies due to high leakage current levels.
Innovation Solution
The implementation of a thin film transistor design featuring a poly-silicon layer with lightly and heavily drain doping segments, where the channel region includes multiple lightly drain doping segments spaced apart, reducing the electric field and hot carrier probability, thereby effectively suppressing leakage current. This design is integrated into a method for fabricating the transistor, array substrate, and display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LTPS TFT structure is used, then manufacturing process is simple, but leakage current cannot be suppressed effectively
Solution Approach 1:
The channel region is segmented into multiple sections by introducing several lightly drain doping segments spaced apart along the channel. This segmentation creates multiple potential barriers that collectively suppress leakage current while maintaining manufacturing feasibility through standard doping processes.
Solution Approach 2:
Different doping concentrations are applied to different regions: lightly drain doping segments with lower concentration are placed at specific positions to suppress leakage, while heavily drain doping regions are placed at electrode connection regions. This local differentiation optimizes both leakage suppression and ease of manufacture.
2Object-generated harmful factors
If lightly drain doping segments are added to suppress leakage current, then leakage current is reduced, but device structure becomes more complex
Solution Approach 1:
The channel is divided into multiple segments by spacing apart several lightly drain doping segments. This segmentation approach suppresses leakage current through multiple potential barriers while maintaining a structured yet manageable device architecture.
Solution Approach 2:
The doping concentration parameter is varied spatially by introducing lightly drain doping segments with lower concentration at specific positions along the channel, while maintaining higher concentration at drain regions. This parameter differentiation achieves leakage suppression without excessive structural complexity.
3Object-generated harmful factors
If multiple lightly drain doping segments are introduced, then leakage current suppression improves, but manufacturing process complexity increases
Solution Approach 1:
Multiple lightly drain doping segments are introduced along the channel region, spaced apart to create potential barriers. These segments can be formed through selective masking and doping processes that extend existing manufacturing capabilities rather than requiring fundamentally new steps.
Solution Approach 2:
Different doping characteristics are applied locally: lightly drain doping segments are positioned at specific locations to suppress leakage, while heavily drain doping regions are positioned at electrode connections. This local optimization achieves leakage suppression with manageable manufacturing complexity.
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
The solution significantly reduces leakage current, improving the yield ratio and making the technology more suitable for low power consumption display products, enhancing their competitiveness.
Implementation Method 1
the channel region includes a plurality of lightly drain doping segments spaced apart along from one of the electrode connection regions to the other electrode connection region... reducing the electric field and hot carrier probability
Implementation Method 2
the channel region includes a plurality of lightly drain doping segments spaced apart... two ends of the channel region, which are connected with the two electrode connection regions, are two lightly drain doping segments
Data Source
AI summary
A thin film transistor, a method for fabricating the same, an array substrate, a display panel, and a display device are provided. The thin film transistor includes a substrate, and an active layer on the substrate, wherein the active layer includes a poly-silicon layer and has a channel region and two electrode connection regions respectively on two sides of the channel region, and the channel region includes a plurality of lightly drain doping segments, which are spaced apart along from one of the electrode connection regions to the other electrode connection region, and channel segments located between the lightly drain doping segments.