Oxide TFT Channel Structure for Display Panel Reliability
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Solution Overview
Problem
Display devices suffer from reduced electrical characteristics due to low reliability and current output of thin film transistors, primarily attributed to structural attributes of the active layers.
Innovation Solution
A display panel and device design incorporating thin film transistors with parallel-connected channel regions made of different oxide semiconductor materials, enhancing electron mobility and reliability by optimizing the structure of active layers and electrode configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single active layer structure is used in thin film transistors, then the device complexity is low, but the electron mobility and current output are insufficient
Solution Approach 1:
The active layer is segmented into multiple distinct layers (first active layer and second active layer), each with different oxide semiconductor materials. This segmentation allows each layer to contribute different properties to the overall transistor performance, improving electron mobility and reliability while maintaining manageable structural complexity through systematic layering.
Solution Approach 2:
The patent employs composite material structures by combining different oxide semiconductor materials in the active layer (e.g., IGZO and IZO layers). This composite approach leverages the advantageous properties of each material to achieve superior electron mobility and transistor reliability compared to single-material structures.
2Productivity
If thin film transistors with conventional active layers are used, then the manufacturing process is simple, but the current output is low
Solution Approach 1:
The active layer is divided into multiple segments (first and second active layers with different materials), where each segment can be optimized for specific electrical characteristics. This segmentation enables higher current output by creating favorable electron transport pathways while maintaining compatibility with existing thin film transistor manufacturing processes.
Solution Approach 2:
The patent changes material parameters by selecting different oxide semiconductor materials for each active layer segment. This parameter change optimizes electrical properties such as electron mobility and threshold voltage, thereby increasing current output while using materials and processes that remain compatible with standard manufacturing techniques.
3Reliability
If low power consumption is achieved with conventional transistors, then the energy efficiency is improved, but the reliability and current capability are reduced
Solution Approach 1:
The composite oxide semiconductor structure combines materials with different electrical characteristics to achieve a balance between power consumption and reliability. The multi-layer configuration enables the transistor to maintain high reliability through optimized electron transport while controlling power consumption via tailored threshold voltage characteristics of the composite structure.
Data Source
AI summary
Discussed are a display panel and a display device including thin film transistors having high reliability and a high current producing characteristic. In one example, the display panel includes a first active layer disposed on a substrate and including a first channel region, a second active layer overlapping a portion of the first active layer and including a second channel region not overlapping the first channel region of the first active layer, first and second electrodes disposed in respective portions of the first and second active layers, respectively, and spaced apart from each other, a gate insulating layer disposed in respective portions of upper surfaces of the first and second active layers, and a third electrode disposed on the gate insulating layer.