Bent Electrode Surface Area for CCFL Efficiency
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Solution Overview
Problem
Conventional cold cathode fluorescent lamps (CCFLs) face inefficiencies in light emission and electrode lifespan due to limited surface area and increased weight with extended electrode length, which compromises compact size and illumination efficiency.
Innovation Solution
The electrodes in the backlight module are modified to have a bent surface with increased surface area through shapes like wave-shaped, concavo-convex, bellow-shaped, or castellated designs, allowing for enhanced electron emission and ion sputtering without lengthening the lamp, thereby improving light emission efficiency and extending the lamp's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the length of the electrode is increased to increase surface area for electron emission and ion sputtering, then the light emission efficiency is improved, but the total length and weight of the hollow glass tube are increased
Solution Approach 1:
The electrode surface is transformed from a flat two-dimensional surface to a three-dimensional bent surface with protrusions and recesses. This dimensional change allows the electrode to achieve a larger surface area within the same longitudinal space, increasing electron emission and ion sputtering areas without extending the lamp length or increasing weight.
Solution Approach 2:
The bent surface structure of the electrode creates nested protrusions and recesses that effectively pack more surface area into a compact volume. The electrode maintains its cylindrical form while incorporating complex surface geometry, allowing increased functional area without increasing overall dimensions.
2Temperature
If the length of the electrode is increased to increase surface area for ion sputtering, then the electrode temperature is reduced, but the total length of the hollow glass tube is increased
Solution Approach 1:
The electrode surface is transformed from a flat two-dimensional surface to a three-dimensional bent surface with protrusions and recesses. This dimensional change allows the electrode to achieve a larger surface area within the same longitudinal space, increasing electron emission and ion sputtering areas without extending the lamp length or increasing weight.
3Illumination intensity
If the length of the electrode is increased to increase surface area for electron emission, then the intensity of UV light is increased, but the effective illumination region is reduced
Solution Approach 1:
The electrode surface is transformed from a flat two-dimensional surface to a three-dimensional bent surface with protrusions and recesses. This dimensional change allows the electrode to achieve a larger surface area within the same longitudinal space, increasing electron emission and ion sputtering areas without extending the lamp length or increasing weight.
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 modified electrode shape increases the surface area for electron emission and ion sputtering, enhancing light emission efficiency and extending the lamp's lifespan while maintaining a compact size by reducing electrode temperature and increasing the effective illumination region.
Implementation Method 1
When a high voltage is applied to the electrode 12a′ of the hollow glass tube, electrons are emitted from the electrode 12b′ at low voltage end to the electrode 12a′ at high voltage end. The electrons are accelerated due to the high voltage, causing collisions with the Hg atoms in the hollow glass tube 11′.
Implementation Method 2
The electrons are accelerated due to the high voltage, causing collisions with the Hg atoms in the hollow glass tube 11′. After collision with the Hg atoms, the Hg atoms quickly return to their stable state, and excess energy produces ultraviolet (UV) light.
Implementation Method 3
When the electrons are emitted from the low voltage end, and the gaseous ions collide at the electrode 12a′ at high voltage, however, a portion of gaseous ions 16′ are sputtered on the surface 15′ of the electrode 12a′
Implementation Method 4
The UV light contacts or impacts the phosphors to produce visible light.
Data Source
AI summary
Light source and backlight module utilizing the same. The light source includes a hollow glass tube and an electrode disposed therein. The electrode comprises a bent surface, increasing surface area, thereby increasing light emission efficiency and reducing temperature.