Field Emission Device Aging Apparatus with Sequential Voltage and Current Control
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Solution Overview
Problem
There is a need for an efficient and cost-effective aging process for field emission devices to stabilize their performance, as existing methods are inefficient and costly for mass production.
Innovation Solution
An apparatus and method that includes a voltage generator to increase the voltage and current of a field emission device in a controlled manner, with a current controller to manage the pulse width and peak value of the field emission current, optimizing the aging process through sequential steps to stabilize the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional aging process is used for field emission devices, then the device performance is stabilized, but the aging process is inefficient and costly for mass production
Solution Approach 1:
The aging process is divided into multiple sequential stages: a first aging stage with initial voltage and current parameters, followed by a second aging stage with adjusted parameters. This segmentation allows optimization of each stage independently, improving overall aging efficiency while maintaining device stability.
Solution Approach 2:
The aging apparatus dynamically adjusts voltage and current parameters during the aging process. The controller modifies electrical parameters based on the aging stage and device response, enabling adaptive optimization that improves both efficiency and effectiveness of the aging process.
2Loss of time
If the voltage and current are increased rapidly to stabilize the field emission device, then the aging time is reduced, but the device may suffer from excessive stress or damage
Solution Approach 1:
The apparatus applies a preliminary aging stage with moderate voltage and current parameters before proceeding to higher parameter stages. This preliminary action gradually conditions the device, preventing sudden stress shocks while still achieving stabilization in a reduced overall time compared to conventional single-stage aging.
Solution Approach 2:
The aging process uses periodic cycling through different voltage and current parameter sets, with each cycle consisting of ramp-up, hold, and ramp-down phases. This periodic action allows the device to adapt progressively to increasing stress levels, reducing cumulative damage while maintaining effective aging.
3Ease of manufacture
If a simple aging process is used, then the cost is reduced, but the aging effectiveness and device stability are insufficient
Solution Approach 1:
The aging apparatus incorporates automated control that monitors device parameters and self-adjusts the aging conditions without requiring complex external intervention. This self-service capability maintains high aging effectiveness while reducing operational costs and simplifying the manufacturing process.
Solution Approach 2:
The apparatus achieves cost-effective aging by strategically changing key electrical parameters (voltage, current, pulse width) across different aging stages rather than maintaining constant high parameters throughout. This parameter optimization reduces energy consumption and equipment requirements while preserving aging effectiveness.
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 solution enables efficient and cost-effective aging of field emission devices, improving their performance and stability, suitable for mass production by optimizing the aging process through controlled voltage and current management.
Implementation Method 1
A field emission device may refer to a device using a field emission effect that draws electrons from a metal surface by an electric field
Implementation Method 2
The field emission device is generally composed of a bipolar structure including a cathode electrode and an anode electrode, or may be composed of a triode structure including a cathode electrode, an anode electrode, and a gate electrode for applying an electric field required for electron emission
Data Source
AI summary
The inventive concept relates to an apparatus for aging a field emission device configured to emitting electrons based on an electric field between a first electrode and a second electrode, and an aging method thereof. The apparatus according to an embodiment of an inventive concept includes a voltage generator and a current controller. The voltage generator increases the voltage applied to the first electrode to the target voltage level during the first time. The current controller increases the field emission current for the second time to the target current level and increases the pulse width of the field emission current for the third time to the target pulse width. According to the inventive concept, the performance of a large field emission device may be improved with high efficiency and low cost.