Field Emission Light Source Using Non-Evaporable Getter
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Solution Overview
Problem
Conventional field emission plane light sources face challenges in maintaining a high degree of vacuum, leading to fluctuating performance and increased fabrication costs due to high-temperature evaporating processes for evaporable getters and poor vacuum near the cathode for non-evaporable getters.
Innovation Solution
A field emission plane light source is designed with a cathode and anode structure that includes a glass matrix with carbon nanotubes, metallic conductive particles, and non-evaporable getter powders, which are mixed and baked to form an electron emission layer, and assembled with supporting members to create a sealed chamber that can be evacuated, ensuring a high degree of vacuum and stable performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If evaporable getter is used, then gas exhaustion capability is improved, but fabrication complexity and cost increase due to high-temperature evaporating process
Solution Approach 1:
The patent changes the operational parameters of the getter from high-temperature evaporation to low-temperature non-evaporable gettering. The non-evaporable getter material is applied as a coating or layer that activates at lower temperatures, eliminating the need for high-temperature evaporating processes while maintaining gas exhaustion capability.
Solution Approach 2:
The patent employs a non-evaporable getter that can be applied as a disposable coating or layer during fabrication. This getter material is designed to be consumed or deactivated after performing its gas exhaustion function, eliminating the need for complex high-temperature processing equipment and procedures.
2Ease of manufacture
If non-evaporable getter is used, then fabrication cost is reduced, but vacuum quality near cathode deteriorates due to positioning away from cathode
Solution Approach 1:
The patent applies the non-evaporable getter locally at or near the cathode position rather than placing it remotely. By positioning the getter material in close proximity to the cathode, the patent ensures high vacuum quality in the critical region near the cathode while maintaining the cost advantages of non-evaporable getter technology.
Solution Approach 2:
The patent uses the getter material as an intermediary substance positioned between the cathode and the residual gas molecules. This intermediary getter layer directly adsorbs gas molecules in the critical region near the cathode, ensuring high vacuum quality without requiring remote positioning.
3Ease of manufacture
If non-evaporable getter is used, then fabrication cost is reduced, but field emission performance stability deteriorates due to poor vacuum near cathode
Solution Approach 1:
The patent applies the non-evaporable getter locally at or near the cathode position rather than placing it remotely. By positioning the getter material in close proximity to the cathode, the patent ensures high vacuum quality in the critical region near the cathode while maintaining the cost advantages of non-evaporable getter technology.
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 maintains a consistent high degree of vacuum, enhancing field emission performance and reducing the risk of cathode and anode shorting, while also lowering fabrication costs by avoiding high-temperature processes.
Implementation Method 1
a non-evaporable getter in the form of powders
Implementation Method 2
a strong electrical field is provided for between the cathode and anode, the strong electrical field excites the carbon nanotubes of the cathode to emit electrons
Implementation Method 3
metallic conductive particles
Data Source
AI summary
A field emission plane light source generally incorporates an anode and a cathode. The anode includes an anode substrate, an anode conductive layer formed on a surface of the anode substrate, and a fluorescent layer formed on the anode conductive layer. The cathode includes a cathode substrate facing and separated from the anode substrate, a cathode conductive layer formed on a surface of the cathode substrate, and an electron emission layer formed on the cathode conductive layer and facing the fluorescent layer of the anode. The cathode and anode substrates have a seal formed therebetween. The electron emission layer includes a glass matrix and a plurality of carbon nanotubes, metallic conductive particles and getter powders dispersed therein. A method for making such field emission plane light source is also provided.