How does LED panel light work?

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Do you know how LED panel lights work? Today, LED lighting manufacturer Xinjielighting will introduce the basic information of LED panel lights, the quality identification of LED panel lights and the working principle of LED panel lights.

Basic information of LED panel light

LED panel light is a new type of surface light source using similar LCD TV backlight technology. It is a high-end indoor lighting fixture. Its light source is SMD LED lamp beads. The panel light has a unique design. The light passes through the light guide plate with high transmittance to form a uniform plane luminous effect. The illumination uniformity is good, the light is soft, comfortable and bright, which helps to relieve eye fatigue.

LED panel light quality

Because the LED panel light ignores the heat of the LED, many medium-power SMD LED panel lights do not have a heat sink and still use a plastic casing, and the light decay is still relatively serious. The resistance-capacitance step-down low-end switching power supply is selected, because the grid voltage is unstable, the current fluctuates, and the brightness fluctuates, the price is moderate, and the quality is slightly better.

Working principle of LED panel light:

The LED used in the LED panel light is a type of semiconductor diode, which can convert electrical energy into light energy. Like ordinary diodes, LED panel light emitting diodes are composed of a PN junction and also have unidirectional conductivity.

When the forward voltage is applied to the light-emitting diode of the LED panel light, the holes injected from the P region to the N region and the electrons injected from the N region to the P region are respectively connected with the electrons in the N region and the P region within a few microns near the PN junction. The holes in the region recombine, resulting in spontaneous emission of fluorescence.

The energy states of electrons and holes in different LED panel light semiconductor materials are different. When electrons and holes recombine, the energy released is somewhat different, the more energy released, the shorter the wavelength of the light emitted.

LED panel light

LED panel lights are commonly used diodes that emit red, green or yellow light. The reverse breakdown voltage of the light-emitting diode is greater than 5 volts.

Its forward volt-ampere characteristic curve is very steep, and a current limiting resistor must be connected in series to control the current through the diode. The current limiting resistor R can be calculated by the following formula: R=(E-UF)/IF where E is the power supply voltage, UF is the forward voltage drop of the LED, and IF is the normal operating current of the LED.

The core part of the light-emitting diode of the LED panel light is a wafer composed of P-type semiconductors and N-type semiconductors. There is a transition layer between the P-type semiconductors and the N-type semiconductors, which is called PN junction.

In the PN junction of some LED panel light semiconductor materials, when the injected minority carriers recombine with the majority carriers, the excess energy will be released in the form of light, thereby directly converting electrical energy into light energy.

When the reverse voltage is applied to the PN junction, it is difficult for minority carriers to inject, so it does not emit light. This kind of diode made by the principle of injection electroluminescence is called light-emitting diode, commonly known as LED.

When the LED panel light is in a forward working state (that is, a forward voltage is applied to both ends), when the current flows from the LED anode to the cathode, the semiconductor crystal emits light of different colors from ultraviolet to infrared. The intensity of the LED panel light is related to the current. related.

Well, the above is the whole content of LED panel lights brought to you by LED lighting manufacturer Xinjielighting. After reading the whole text in detail, everyone has some understanding of the working principle of LED panel lights, and can also identify the quality of LED panel lights. , I hope the above content is helpful to you. For more LED lighting information, please refer to the following: 

What is LED panel light?

What are the components of LED panel lights?

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