IGZO Display Panel Gate Structure for Threshold Voltage Stability
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Solution Overview
Problem
In display panels, non-bonded oxygens (NBOs) in IGZO thin film transistors affect carrier concentrations, leading to instability in threshold voltage and switching current ratio, which negatively impacts the display effect.
Innovation Solution
A display panel structure is implemented with a first oxygen-absorbing metal layer adjacent to the second semiconductor layer, which absorbs NBOs, thereby reducing their influence on carrier concentrations and improving the stability of thin film transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If IGZO is used as semiconductor channel layer material, then high mobility and transparency are achieved, but non-bonded oxygens affect carrier concentrations and reduce device stability
Solution Approach 1:
An oxygen-absorbing metal layer is introduced as an intermediary between the IGZO semiconductor layer and the gate electrode. This intermediary layer absorbs non-bonded oxygens (NBOs) that would otherwise affect carrier concentrations in the IGZO layer, thereby stabilizing device performance while preserving high mobility characteristics
Solution Approach 2:
The harmful non-bonded oxygens (NBOs) are extracted or removed from the vicinity of the IGZO semiconductor layer by the oxygen-absorbing metal layer. This extraction process eliminates the source of instability (carrier concentration fluctuations) while maintaining the beneficial electrical properties of IGZO
2Measurement precision
If IGZO-TFTs are used in display panels, then high precision and low power consumption are achieved, but threshold voltage instability occurs due to non-bonded oxygens
Solution Approach 1:
The oxygen-absorbing metal layer serves as a mediator that stabilizes the chemical environment near the IGZO channel layer, preventing threshold voltage drift caused by non-bonded oxygens while preserving the high precision display characteristics enabled by IGZO-TFTs
3Stability of the object's composition
If IGZO is used as semiconductor material, then good uniformity is achieved, but switching current ratio deteriorates due to non-bonded oxygen effects
Solution Approach 1:
Non-bonded oxygens that degrade switching current ratio are extracted from the IGZO semiconductor structure by the oxygen-absorbing metal layer, thereby recovering the switching performance while maintaining the inherent uniformity of IGZO films
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 introduction of the oxygen-absorbing metal layer enhances the stability of carrier concentrations, improving the threshold voltage and switching current ratio, resulting in improved device stability and display performance.
Implementation Method 1
one side of the third gate electrode adjacent to the second semiconductor layer is provided with a first oxygen-absorbing metal layer, and the first oxygen-absorbing metal layer overlaps the second semiconductor layer
Data Source
AI summary
A display panel includes a substrate, a first semiconductor layer, a first metal layer, a second metal layer, a second semiconductor layer, and a third metal layer. The third metal layer includes a third gate electrode, and the third gate electrode overlaps the second semiconductor layer. One side of the third gate electrode adjacent to the second semiconductor layer is provided with a first oxygen-absorbing metal layer, and the first oxygen-absorbing metal layer overlaps the second semiconductor layer. The present disclosure can improve a display effect of the display panel.