Oxide TFT Bilayer Composition for High-Speed UHD Gate Driving
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Solution Overview
Problem
Ultra-high definition (UHD) flat display devices require high-speed driving, which leads to shortened one-line scanning times, potentially causing pixel charge failure and image quality deterioration due to insufficient data voltage supply.
Innovation Solution
A thin film transistor with an oxide semiconductor layer, specifically using a first layer of iron-indium-zinc oxide (FIZO) and a second layer of indium-gallium-zinc oxide (IGZO), is developed to enhance electron mobility and support high-speed driving in UHD display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the one-line scanning time is shortened to enable high-speed driving in UHD display devices, then the driving speed is improved, but the pixel may not be charged with desired data voltage, causing deterioration in image quality
Solution Approach 1:
The patent changes the material parameters of the oxide semiconductor layer by introducing iron (Fe) as a dopant and adjusting the composition ratios of indium (In), gallium (Ga), and zinc (Zn). This modifies the electrical properties of the semiconductor layer to achieve higher electron mobility, enabling fast driving while maintaining reliable pixel charging and image quality
Solution Approach 2:
The patent uses composite oxide semiconductor materials with specific composition ratios of multiple elements (In, Ga, Zn, Fe, and oxygen). The composite structure allows optimization of both electron mobility for high-speed driving and electrical stability for reliable image display, resolving the contradiction between speed and reliability
2Manufacturing precision
If the oxide semiconductor layer is implemented as a short channel to achieve high pixels per inch (PPI), then the display resolution is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the thickness and composition parameters of the oxide semiconductor layer to achieve the required short channel dimensions for high PPI displays. By controlling the material composition and layer thickness, the patent enables precise manufacturing of short-channel transistors with the needed electrical characteristics
Data Source
AI summary
Disclosed are a thin film transistor having an oxide semiconductor layer which is applicable to a flat display device requiring high-speed driving due to ultra-high definition, a gate driver including the same, and a display device including the same. The thin film transistor includes a first oxide semiconductor layer formed of iron-indium-zinc oxide (FIZO) and a second oxide semiconductor layer formed of indium-gallium-zinc oxide (IGZO), thus being capable of exhibiting effects, such as high reliability and high electron mobility.