Vertical-Channel Shift Register Output Circuit for Compact Reliable Driving
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Solution Overview
Problem
Existing semiconductor devices face challenges in achieving high density integration, low power consumption, and high reliability while occupying a small area.
Innovation Solution
A shift register is designed with a specific configuration of conductive and insulating layers, including oxide semiconductor layers, to facilitate efficient signal output through transistors, thereby reducing device size and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transistor size is reduced to achieve high density integration, then integration density is improved, but manufacturing precision and reliability become more difficult to maintain
Solution Approach 1:
The patent transitions from planar transistor structures to vertically stacked three-dimensional structures. Multiple oxide semiconductor layers are stacked in the vertical direction to form multi-layer transistor channels, enabling high-density integration without proportionally reducing transistor dimensions. This dimensional change allows maintaining manufacturing precision while achieving higher integration density.
Solution Approach 2:
The patent employs composite oxide semiconductor structures with multiple layers having different compositions and characteristics. By stacking oxide semiconductor layers with varying material properties, the design achieves both high integration density and reliable transistor operation, resolving the contradiction between miniaturization and manufacturing precision.
2Area of moving object
If transistor size is reduced to occupy smaller area, then device area is reduced, but power consumption control and reliability become challenging
Solution Approach 1:
The patent uses vertically stacked oxide semiconductor layers to reduce the horizontal footprint of transistors while maintaining reliable operation through the vertical channel structure. The multi-layer configuration enables compact device area occupation while preserving transistor reliability through controlled electrical characteristics in the vertical direction.
Solution Approach 2:
The patent controls transistor reliability by adjusting parameters of the oxide semiconductor layers, including composition ratios, layer thicknesses, and stacking configurations. These parameter changes enable reliable transistor operation in miniaturized devices by optimizing electrical characteristics despite reduced device area.
3Reliability
If oxide semiconductor layers are stacked to increase field-effect mobility, then transistor performance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent achieves high field-effect mobility by stacking oxide semiconductor layers in the vertical dimension rather than increasing lateral dimensions. This vertical stacking approach improves transistor performance while managing complexity through a systematic multi-layer architecture that can be fabricated using established thin-film deposition techniques.
Solution Approach 2:
The patent divides the semiconductor channel into multiple segmented oxide layers, each contributing to the overall field-effect mobility. This segmentation allows independent optimization of each layer's properties while achieving cumulative performance improvement, balancing enhanced mobility with manageable manufacturing complexity.
Data Source
AI summary
A novel signal output circuit is provided. A shift register includes a signal output circuit including a vertical-channel transistor. With the use of a gate-source parasitic capacitance or a gate-drain parasitic capacitance, whichever has a larger capacitance value, of the vertical-channel transistor as a bootstrap capacitor, the signal output circuit that occupies a small area can be obtained. With the use of an oxide semiconductor for a semiconductor layer of the vertical-channel transistor, the withstand voltage between the source and the drain can be increased, so that the channel length can be decreased. In addition, stable operation can be performed even in a high-temperature environment.