Field Emission Cathode Second Grid Electron Control
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Solution Overview
Problem
Conventional field emission cathode devices face challenges in controlling the uneven and unsteady emission of electrons to the anode electrode, leading to inefficient luminance in field emission displays.
Innovation Solution
The proposed field emission cathode device incorporates a second grid electrode with adjustable voltage to control electron emission, featuring a dielectric layer with specific openings and a driving method that involves supplying voltages to the cathode, gate, and grid electrodes to manage electron extraction and emission, ensuring uniformity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate electrode has an opening to expose electron emitters, then electron extraction is enabled, but electron emission becomes uneven and unsteady
Solution Approach 1:
A second grid electrode is introduced as an intermediary component between the gate electrode and the anode electrode. This second grid electrode independently controls electron emission by applying specific voltages, mediating the electron flow from the emission layer to the anode. The intermediary structure enables separate control of electron extraction (via gate electrode) and electron emission (via second grid electrode), resolving the contradiction between enabling electron extraction and maintaining emission stability.
Solution Approach 2:
The control of electron flow is segmented into two independent stages: electron extraction controlled by the gate electrode and electron emission controlled by the second grid electrode. This segmentation allows each electrode to perform its specific function optimally without interfering with the other, thereby achieving both effective electron extraction and stable, controllable emission.
2Illumination intensity
If electrons directly bombard the anode through gate electrode opening, then luminance is produced, but emission uniformity deteriorates
Solution Approach 1:
The second grid electrode serves as a mediator that regulates electron emission to the anode. By controlling the voltage on the second grid electrode, the emission of electrons can be uniformly managed, ensuring that electrons are emitted steadily and uniformly to bombard the anode, thereby maintaining both luminance intensity and emission uniformity.
3Reliability
If a second grid electrode is added to control electron emission, then emission uniformity and stability improve, but device complexity increases
Solution Approach 1:
The second grid electrode is designed with multi-functionality: it serves as both a control electrode for electron emission and as part of the overall electron transport structure. By integrating this single component to perform multiple functions (emission control, voltage distribution, and structural support), the increase in device complexity is minimized while achieving improved emission stability and uniformity.
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 the uniformity and stability of electron emission, improving the luminance and efficiency of field emission displays by controlling electron flow through the second grid electrode, which is independent of the electron emission layer.
Implementation Method 1
The gate electrode provides an electrical potential to extract electrons from the plurality of electron emitters
Implementation Method 2
an anode electrode provides an electrical potential to accelerate the extracted electrons to bombard the anode electrode for luminance
Implementation Method 3
incorporates a second grid electrode with adjustable voltage to control electron emission
Data Source
AI summary
A driving method includes providing a field emission cathode device. The field emission cathode device includes a cathode electrode, an electron emission layer electrically connected to the cathode electrode, a first gate electrode spaced from the cathode electrode by a first dielectric layer, and a second grid electrode spaced from the first gate electrode by a second dielectric layer. The second dielectric layer has a second opening. A first voltage is supplied to the cathode electrode, a second voltage is supplied to the first gate electrode, and a third voltage is supplied to the second grid electrode, to extract electrons from the electron emission layer to a space formed by the second opening, until the electrons of the space saturate. The third voltage is greater than the second voltage, such that the electrons of the space are emitted through the second grid electrode.