Field Emission Cathode Structure for Display Resolution
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Solution Overview
Problem
Field emission displays using traditional cathode structures suffer from low resolution due to disorderly movement of secondary electrons and accumulation of positive charges, which complicates electron emission direction control.
Innovation Solution
A field emission cathode structure is designed with specific geometric configurations, including insulating substrates, cathode and gate electrodes, field emission units, and conductive layers, where the dimensions of insulators, field emission units, and fixing layers are optimized to reduce electron collisions and positive charge accumulation, enhancing image clarity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional field emission cathode structure is used, then electron emission function is achieved, but secondary electrons hit the dielectric layer edge causing disorderly movement and unclear pixel boundaries
Solution Approach 1:
The patent introduces a new component (grid or shield structure) positioned between the field emission unit and the dielectric layer edge. This intermediary component captures or redirects secondary electrons before they can hit the dielectric layer, preventing disorderly electron movement and maintaining clear pixel boundaries without affecting the primary electron emission function.
2Manufacturing precision
If traditional field emission cathode structure is used, then electron emission is achieved, but positive charges accumulate on the dielectric layer causing difficulty in controlling electron emission directions
Solution Approach 1:
The patent extracts or removes the source of positive charge accumulation by modifying the dielectric layer structure or adding a charge neutralization mechanism. This could involve creating a charge compensation layer or modifying the dielectric material properties to prevent charge buildup, thereby maintaining precise control over electron emission directions.
3Device complexity
If field emission units are positioned close to dielectric layer edges, then device integration is improved, but resolution deteriorates due to electron scattering at boundaries
Solution Approach 1:
The patent places an intermediary structure (such as a grid or protective layer) between the field emission units and the dielectric layer boundaries. This intermediary component prevents electron scattering at the boundaries while allowing the field emission units to remain in integrated positions, thus maintaining both device integration and display resolution.
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 optimized structure improves image clarity and resolution by minimizing electron collisions and charge accumulation, allowing for better control over electron emission directions and resulting in a clearer display.
Implementation Method 1
the field emission units emit electrons under a voltage between the grids and the cathodes. The emitted electrons pass the holes of grids under the attraction forces of the grids
Implementation Method 2
The emitted electrons pass the holes of grids under the attraction forces of the grids
Implementation Method 3
a dielectric layer having an upper and lower section, disposed on the insulating substrate, and defining a plurality of voids corresponding to the field emission units, and a number of grids disposed between the upper and lower sections
Data Source
AI summary
A field emission cathode structure includes an insulating substrate, a number of strip cathode electrodes, a number of insulators, a number of strip gate electrodes, a number of electron emission units, and a number of fixing layers. The number of insulators is located among and spaced apart from the number of strip cathode electrodes. The field emission cathode structure further satisfies the following conditions: D1≦D2/10, wherein, D1 is defined as a width of each of the number of insulators, and D2 is defined as a distance between centerlines of each two adjacent field emission units of the number of field emission units.