“As a designer who plan Design or use Electroluminescent EL product. first step,he need know Electroluminescent characteristic and application.this article Start with Electroluminescent structure and principle of work,explain Electroluminescent EL electrical specification
, optical character,environmental characteristic.also explain Electroluminescent characteristic,excellent feature and some wrong mentality of designing”
Electroluminescent (EL) backlight system is composed of Electroluminescent light and Electroluminescent drive.Electroluminescent Light film of thickness less than 0.2mm,spray Electroluminescent on insulator which between two pieces electrodes.SULS can use different light-emitting materials,Such as zinc sulphide(ZnS), sulfurated lime or strontium monosulfide,then Doped with other elements,Such as magnesium (Mg),samarium (Sm),europium(Eu) or Add fluorescent dye to adjust the brightness and color of light.SULS can change pump-frequency also change the Color of Electroluminescent Light.When the frequency increases, the color changes to bluish.when the Frequency decreases, the color will change to green.when the excitation voltage is 200V/400Hz,the Color of Electroluminescent Light is original color.EL lamps is very strong flexible.under the premise of the electrode is not breakage, Electroluminescent Light Can be arbitrarily cut or curved does not affect the luminescence properties.Electroluminescent (EL)Light film is a “flat” transmitter( Comparison of LED),Without light guide plate diffuser Can achieve full surface uniform light.LED is a “hot spot” light,”Hot spots” are often bring about unexpected interference to sophisticated electronic system.but Electroluminescent (EL)Light is cool light.
Relative to the LED backlight system,the another advantage of Electroluminescent (EL) backlight system is to reduce power consumption.
Electroluminescent (EL) just need is high-voltage,but the Load current of EL is very small.the range is about 0.03-1mA/cm².generally speaking,when the area EL light is less than 10 cm²,the operating current just is several mA.however,drive a LED need current is 5 to 10mA.Low power consumption for battery-powered equipment, has considerable significance.
from the electrical characteristics,Electroluminescent (EL) Resistance-capacitance characteristics.the Capacitance is 2-6nF/in2.
Resistor is usually 50 to 15000KOhm/in2.the Maximum drive size and the Brightness of same Electroluminescent (EL) inverter to drive different Electroluminescent EL lamp is different.
the brightness EL lamp is the combined effect of several electrical parameters.
the driving voltage increases, the brightness increase;The driving frequency increases, the brightness increase;However, when the frequency increased to several thousand Hz, the increase in brightness will gradually decrease
On the other hand, the driving frequency increases, the luminous efficiency of EL light will reduce;
the material, quality and construction of Electroluminescent (EL) light will influence EL Luminance and efficiency.For example, the different colors of EL lamp efficiency is different, the green EL lamp is The most efficient.
In addition,the mapping units of EL lamp brightness is footlambert(fL) or nits,1fL=0.2919nits.not intensity of reflected light (lux).
the half life period Measure Electroluminescent (EL) life,when Electroluminescent (EL) lamp brightness is reduced to half of brightness the Electroluminescent (EL) lamp continuous working time.the half life period of SULS EL is 5,000 to 10,000 hours.This depends on the light-emitting material, excitation voltage and frequency.Higher driving voltage and high frequency drive will reduce the service life of EL lamp.high humidity and high temperature environment also will reduce the service life of Electroluminescent EL light.the direct-current component which be lead into slaving voltage will reduct the service life of Electroluminescent EL light www.ellightmade.com.
the way that the EL inverter link Electroluminescent EL light and earth connection is wrong.Because it not only add DC component to EL lamp,also add more interference signals.
On the electrical characteristics,the service life of Electroluminescent EL light reduction mean Reduction of the equivalent capacitance and equivalent resistance increases.the most of Electroluminescent Applications, Electroluminescent light use low-voltage DC systems.Such as battery-powered.but EL lamp must be driven high voltage.Usually require driving circuit should be efficiently converted into DC voltage frequencies 200Hz to 1KHz,The amplitude of the AC voltage 50 to 200Vpp.
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