Dielectric-Free Triode Field Emission Display with Double-Gate Single-Cathode Units
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Solution Overview
Problem
Current field emission display (FED) technologies face challenges in manufacturing complexity, high turn-on voltage, poor uniformity, and limited brightness due to the need for dielectric layers, which restrict the enhancement of anode voltage and luminous efficiency.
Innovation Solution
A dielectric-free triode FED device based on double-gate/single-cathode type electron emission units with parallelly positioned anode and cathode/gate plates, where cathodes and gate electrodes are separately arranged with vacuum spacing, allowing for different drive methods such as tripotential and two-potential fixed voltage or pulse scanning to control electron emission units, eliminating the need for dielectric layers and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric layers are used in conventional FED structures, then electrical insulation is provided, but manufacturing complexity increases and luminous efficiency is reduced
Solution Approach 1:
The patent removes the dielectric layer from the conventional FED structure, extracting the insulation function and replacing it with a vacuum-based electrical isolation mechanism. The vacuum space between the cathode/gate plate and anode plate provides natural electrical insulation without requiring additional dielectric materials, thereby simplifying manufacturing while maintaining reliability.
Solution Approach 2:
The vacuum space acts as an intermediary medium that provides electrical insulation between the cathode/gate plate and anode plate. Instead of using dielectric materials as intermediaries, the vacuum itself serves as the insulating medium, enabling current control while eliminating the complexity associated with dielectric layer deposition and processing.
2Reliability
If dielectric layers are used in conventional FED structures, then electrical insulation is provided, but luminous efficiency is reduced due to voltage limitations
Solution Approach 1:
By removing the dielectric layer, the patent eliminates the voltage drop across the dielectric material, allowing higher anode voltages to be applied directly. This extraction of the dielectric constraint enables greater voltage modulation range, which directly improves electron emission control and phosphor excitation efficiency, thereby increasing luminous efficiency.
Solution Approach 2:
The patent changes the electrical parameter configuration by eliminating the dielectric layer, which allows for higher anode voltage operation. The voltage modulation range is expanded from conventional limited ranges to higher values, enabling more efficient electron emission and phosphor excitation, thus improving luminous efficiency through parameter optimization.
3Ease of operation
If front-gate structure is used, then low gate voltage is required, but fabrication process becomes complex and large area display is difficult to achieve
Solution Approach 1:
The patent merges the cathode and gate electrodes onto a single plate (cathode/gate plate), eliminating the need for separate front-gate and cathode structures. This integration simplifies the fabrication process by reducing the number of components and assembly steps, while still maintaining low gate voltage operation through the vacuum-based field emission mechanism.
Solution Approach 2:
The patent transitions from a three-dimensional stacked structure (front-gate, cathode, anode separated in space) to a two-dimensional planar configuration where cathode and gate electrodes are arranged on the same plate surface. This dimensional simplification makes the structure more suitable for large-area fabrication using conventional planar processing techniques.
4Ease of manufacture
If back-gate structure is used, then gate electrode is buried under cathode, but anode voltage must be limited to avoid diode-type emission
Solution Approach 1:
The vacuum space serves as an intermediary that allows the gate electrode to control electron emission from the cathode without the cathode being directly exposed to the anodic electric field. This vacuum-mediated field emission mechanism enables the gate to effectively modulate electron flow even with the back-gate configuration, allowing for broader anode voltage ranges without causing diode-type emission.
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 solution simplifies the manufacturing process, improves electron emission uniformity, and enhances the performance of FED displays by allowing for higher anode voltage modulation without the need for dielectric layers, thereby increasing luminous efficiency and reducing fabrication complexity.
Implementation Method 1
Electrons are emitted from the cathode under the control of gate electric field and bombard the phosphor on the anode to realize luminescence
Implementation Method 2
Electrons are emitted from the cathode under the control of gate electric field and bombard the phosphor on the anode to emit light
Data Source
AI summary
The present invention relates to display manufacturing technology, especially for a dielectric-free triode field emission display device based on double-gate/single-cathode type electron emission units and the device drive methods. This device comprises parallelly positioned anode and cathode/gate plates, during production, gate/cathode/gate electron emission units are set on the cathode/gate plate side by side. The spacing between cathode and gate electrodes is vacuum circumstance. For each cathode, an anode is positioned on the anode plate, facing the cathode. And the voltages applied on the cathode and gate electrodes are to scan and the anode voltage is to adjust the signal. When the electrodes on the cathode/gate plate take on fixed roles, fixed voltages are used to drive the device. When these electrodes on the cathode/gate plate can be used interchangeably as cathode or gate electrodes, respectively, pulse scanning method is used to drive the device.