Oxide Semiconductor Non-Linear Element for Stable Protective Circuits
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Solution Overview
Problem
Existing display devices using oxide semiconductors face challenges in achieving stable operation and enhanced protective circuit functionality due to limitations in manufacturing processes and material properties, particularly in high-temperature environments and large substrate sizes.
Innovation Solution
A display device structure incorporating a non-linear element with a combination of oxide semiconductors of different oxygen contents, where the first oxide semiconductor layer has higher oxygen concentration for lower electrical conductivity and the second oxide semiconductor layer has oxygen deficiency for higher conductivity, is used to form a protective circuit that stabilizes operation and enhances functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective circuit is formed using conventional structures, then the basic protection function is provided, but the operation stability and reliability are insufficient
Solution Approach 1:
The patent changes the electrical conductivity parameter of the oxide semiconductor by controlling oxygen content. The first oxide semiconductor layer has higher oxygen concentration for lower conductivity, while the second oxide semiconductor layer has oxygen deficiency for higher conductivity. This parameter change enables the protective circuit to achieve stable operation with reduced junction leakage without increasing structural complexity.
Solution Approach 2:
The patent uses a composite structure of two different oxide semiconductor layers with distinct oxygen contents. The first oxide semiconductor layer (higher oxygen) and second oxide semiconductor layer (lower oxygen) are stacked to form a non-linear element that provides both protection function and operational stability, resolving the contradiction between reliability and complexity.
2Reliability
If metal wirings are used for connection, then the electrical conductivity is high, but the junction leakage increases and thermal stability decreases
Solution Approach 1:
The patent changes the material parameter from metal to oxide semiconductor with controlled oxygen content. The second oxide semiconductor layer, having oxygen deficiency, provides higher electrical conductivity comparable to metal, while the first oxide semiconductor layer with higher oxygen content reduces junction leakage and enhances thermal stability, eliminating the trade-off between conductivity and stability.
3Reliability
If oxide semiconductor with high oxygen content is used, then the thermal stability is high, but the electrical conductivity is low
Solution Approach 1:
The patent segments the oxide semiconductor into two distinct layers with different oxygen contents. The first oxide semiconductor layer (higher oxygen) provides thermal stability, while the second oxide semiconductor layer (lower oxygen) provides electrical conductivity. This segmentation allows both requirements to be satisfied simultaneously in the protective circuit structure.
Solution Approach 2:
The patent applies local quality by giving different oxygen concentrations to different layers of the oxide semiconductor structure. The first layer has higher oxygen content for thermal stability, while the second layer has lower oxygen content for electrical conductivity, allowing each region to optimize its local function.
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 proposed structure allows for stable operation and improved functionality of the protective circuit by utilizing the higher conductivity of the second oxide semiconductor layer, reducing junction leakage and enhancing thermal stability compared to direct contact with metal wirings.
Implementation Method 1
the second oxide semiconductor layer has oxygen deficiency for higher conductivity
Implementation Method 2
enhancing thermal stability compared to direct contact with metal wirings
Data Source
AI summary
A protective circuit includes a non-linear element which includes a gate electrode, a gate insulating layer covering the gate electrode, a first oxide semiconductor layer overlapping with the gate electrode over the gate insulating layer, and a first wiring layer and a second wiring layer whose end portions overlap with the gate electrode over the first oxide semiconductor layer and in which a conductive layer and a second oxide semiconductor layer are stacked. Over the gate insulating layer, oxide semiconductor layers with different properties are bonded to each other, whereby stable operation can be performed as compared with Schottky junction. Thus, the junction leakage can be reduced and the characteristics of the non-linear element can be improved.