Fluid Layer Memory Device With Multi-Material Electrodes
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Solution Overview
Problem
Current three-dimensional NAND flash memory technologies face challenges in achieving high data storage capacity and multivalued data settings due to limitations in the arrangement and functionality of memory cells.
Innovation Solution
A memory device with a fluid layer, multiple control electrodes made of different materials, and insulating films is designed to store data using charged particles, allowing for three-dimensional arrangement of memory cells and enabling multivalued data storage by controlling the movement of charged particles through electrostatic potential changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cells are three-dimensionally disposed to increase storage capacity, then the number of memory cells increases, but the complexity of controlling charged particles and ensuring stable data storage worsens
Solution Approach 1:
The memory cell is divided into multiple control electrodes (first control electrode, second control electrode, third control electrode) with different materials, each responsible for specific operations. This segmentation allows independent control of charged particles for different functions (writing, reading, erasing) in three-dimensional space, managing complexity through functional division.
Solution Approach 2:
A fluid layer containing charged particles serves as an intermediary medium between control electrodes and data storage locations. The charged particles can be moved and positioned within the fluid layer to represent data, enabling flexible three-dimensional storage while simplifying control through particle manipulation rather than direct electrical connection to each storage location.
2Quantity of substance
If multivalued data storage is implemented by increasing bits per memory cell, then data capacity increases, but the precision required for reading and writing data worsens
Solution Approach 1:
The patent replaces traditional electrical charge storage with a mechanical-like system of moving charged particles in a fluid layer. Data is stored by positioning particles at specific locations, and multivalued data is achieved by counting particles or detecting their positions. This substitution allows for more robust and precise detection compared to traditional electrical methods.
Solution Approach 2:
The patent changes the fundamental parameter for data storage from electrical charge magnitude to particle position and count. By controlling the number of charged particles at specific locations or their spatial distribution, multivalued data can be stored with higher precision, as particle counting and position detection are more reliable than measuring subtle electrical charge differences.
3Ease of manufacture
If traditional NAND flash memory structures are used, then manufacturing is well-established, but the ability to achieve high data retention and accuracy worsens
Solution Approach 1:
The patent employs composite materials including a fluid layer containing charged particles, multiple control electrodes made of different materials, and insulating films. This composite structure combines the advantages of different materials to achieve both manufacturability and high reliability, with each layer contributing specific properties for particle control and data retention.
Solution Approach 2:
The patent incorporates multiple control electrodes with different materials designed to compensate for potential errors and variations in particle behavior. The third control electrode, for example, can be used to correct or verify data stored by the first and second control electrodes, providing beforehand cushioning against data retention issues and improving overall accuracy.
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
This configuration enhances data storage capacity and allows for stable multivalued data reading and writing, improving data accuracy and retention characteristics by isolating and counting charged particles.
Implementation Method 1
enabling multivalued data storage by controlling the movement of charged particles through electrostatic potential changes
Data Source
AI summary
A memory device according to an embodiment includes a fluid layer extending in a first direction, a particle in the fluid layer, a first control electrode made of a first material, a first insulating film provided between the fluid layer and the first control electrode, a second control electrode made of a second material and provided to be spaced apart from the first control electrode in the first direction, a second insulating film provided between the fluid layer and the second control electrode, a third control electrode made of a third material different from the first material and the second material and provided between the first control electrode and the second control electrode, and a third insulating film provided between the fluid layer and the third control electrode.