Field Emission Device Gate Electrode Vibration Noise Reduction
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Solution Overview
Problem
Field emission devices with metal mesh-type gate electrodes experience noise due to vibration, which is challenging to mitigate through tight fixation or frequency adjustment during fabrication.
Innovation Solution
A pulse drive-type field emission device with a power source applying compensated pulse wave voltage to the gate electrode, using a pentagonal pulse wave voltage with controlled duty and voltage levels to minimize vibration and noise, and a driving method that generates a pentagonal pulse wave voltage with a greater duty than the cathode electrode's pulse duty to reduce voltage change rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse driving is applied to guarantee durability of field emitter or represent dynamic gradation, then device performance is improved, but noise is generated due to vibration of metal mesh-type electrode
Solution Approach 1:
The patent applies a compensated pulse wave voltage with specifically controlled parameters (amplitude, width, shape) to the gate electrode. By adjusting these voltage parameters, the electrode vibration is compensated and noise is reduced while maintaining the pulse driving benefits for field emitter durability and dynamic gradation representation.
Solution Approach 2:
The compensated pulse wave voltage is designed in advance to counteract the vibration effects. By pre-calculating and applying the compensating voltage waveform before vibration occurs, the noise-generating vibrations are prevented while allowing necessary pulse driving operations.
2Object-generated harmful factors
If metal mesh-type electrode is tightly fixed to cathode substrate to prevent noise, then noise is reduced, but fabrication complexity increases
Solution Approach 1:
The patent replaces the mechanical fixation approach with an electrical compensation approach. Instead of mechanically tightening or precisely positioning the metal mesh electrode during fabrication, an electrical signal (compensated pulse wave voltage) is applied to actively counteract vibrations, thereby eliminating noise without increasing fabrication complexity.
3Object-generated harmful factors
If frequency of noise is adjusted by changing intervals of spacers to be outside audible frequency range, then noise perception is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Instead of changing the physical dimensions (spacer intervals) to alter noise frequency, the patent changes the electrical parameters of the applied voltage waveform. The compensated pulse wave voltage is designed with specific amplitude, width, and shape parameters that directly counteract vibrations, avoiding the need for high-precision spacer fabrication.
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 effectively decreases noise from the metal mesh-type gate electrode without requiring additional fabrication processes, by modifying the pulse driving waveform to reduce sudden voltage changes and vibration, thereby enhancing the operational stability of field emission devices.
Implementation Method 1
such pulse driving produces noise due to vibration of the metal mesh-type electrode
Implementation Method 2
a gate electrode for inducing electrons from a field emitter and concentrating emitted electrons to a particular region of an anode
Implementation Method 3
a field emitter formed on the cathode electrode; a metal mesh-type gate electrode formed between the anode substrate and the cathode substrate, and having openings through which electrons emitted from the field emitter pass
Data Source
AI summary
Provided is a pulse drive-type field emission device. The pulse drive-type field emission device includes anode and cathode substrates that are spaced apart from and face each other, a cathode electrode formed on the cathode substrate, and a field emitter formed on the cathode electrode. The pulse drive-type field emission device further includes a metal mesh-type gate electrode having an opening through which electrons emitted from the field emitter pass and a power source which applies a compensated pulse wave power to the gate electrode or the cathode electrode to compensate for vibration of the gate electrode. Thus, noise from the metal mesh can be prevented without additional fabrication processes by modifying a waveform in pulse driving.