Field Emission Lighting Sequential Phosphor Activation
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Solution Overview
Problem
Traditional fluorescent light sources contain mercury, posing health and disposal challenges, and existing field emission lighting designs suffer from reduced lifespan due to heat generated during luminescence, which affects luminous efficiency and longevity.
Innovation Solution
A field emission lighting arrangement where only selected portions of the phosphor layer are sequentially activated to emit light, allowing for controlled electron beam direction and frequency, reducing heat buildup and increasing lifespan through the use of gate electrodes and a power supply unit to manage electron emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the complete phosphor layer is activated continuously, then the light emission intensity is high, but the heat generated reduces the lifetime of the lighting arrangement
Solution Approach 1:
The patent applies periodic action by sequentially activating different portions of the phosphor layer in cycles. The phosphor layer is divided into multiple portions that are activated alternately, allowing each portion to cool down during the activation of others. This periodic activation pattern maintains high overall light emission intensity while preventing excessive heat accumulation in any single portion, thereby extending the lifetime of the lighting arrangement.
Solution Approach 2:
The patent segments the phosphor layer into multiple distinct portions that can be activated independently and sequentially. This segmentation allows the system to distribute the heat generation across different spatial regions over time, preventing localized overheating while maintaining continuous light output. The gate electrode structure enables independent control of each segment, facilitating the sequential activation strategy.
2Duration of action of stationary object
If selected portions are activated sequentially, then the lifetime is increased, but the device complexity increases due to gate electrodes and control units
Solution Approach 1:
The patent employs dynamics by making the gate electrode potentials variable and controllable. The potentials applied to different gate electrodes can be dynamically adjusted to activate or deactivate specific phosphor portions as needed. This dynamic control capability allows the system to implement sequential activation patterns that extend lifetime while providing flexibility in managing the complexity through programmable control strategies.
3Loss of energy
If the phosphor layer is cooled between activations, then the luminous efficiency is maintained, but the frequency of light emission is reduced
Solution Approach 1:
The patent achieves continuity of useful action by ensuring that while one portion of the phosphor layer is cooling down, another portion is being activated to emit light. This overlapping activation pattern maintains continuous light emission without interruption, preserving both luminous efficiency through cooling intervals and productivity through seamless transitions between portions. The overall system maintains high frequency of light emission while individual portions benefit from cooling periods.
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 approach extends the lifespan of field emission lighting, potentially lowering replacement costs and maintaining high luminous efficiency by managing heat and electron emission effectively.
Implementation Method 1
a field emission cathode (104) arranged inside an evacuated envelope (110), wherein the field emission cathode (104) comprises a substrate (102) onto which a plurality of sharp emitters has been provided
Implementation Method 2
The phosphor layer may provide luminescence when the emitted electrons collide with phosphor particles
Implementation Method 3
The at least one gate electrode is arranged to be activated such that the direction of electrons being emitted by the field emission cathode depends on a control voltage (with reference to a voltage potential applied to the field emission cathode) applied to the at least one gate electrode
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a field emission lighting arrangement, comprising an anode structure at least partly covered by a phosphor layer, an evacuated envelope inside of which an anode structure is arranged, and a field emission cathode, wherein the field emission lighting arrangement is configured to receive a drive signal for powering the field emission lighting arrangement and to sequentially activate selected portions of the phosphor layer for emitting light. The same control regime may be applied to an arrangement comprising a plurality of field emission cathodes and a single field emission anode. Advantages with the invention includes increase lifetime of the field emission lighting arrangement.