LED flashlight is a new type of flashlight with LED (Light Emitting Diode) as the light source. Because LED has the characteristics of high brightness, low power consumption, long life and small size, it is an ideal choice for portable lighting. Atomic electrons have many energy levels. When electrons transition from high energy levels to low energy levels, the energy of the electrons is reduced, and the reduced energy is converted into photons and emitted. A large number of these photons are lasers.
The principle of LED lighting is similar. However, the difference is that LEDs do not emit light through electronic jumps inside atoms, but by applying a voltage across the PN junction of the LED to make the PN junction itself form an energy level (actually, a series of energy levels). level), and then electrons jump at this energy level and produce photons to emit light.
New LED display devices have the advantages of low power consumption, high brightness, long life, and small size. This article starts with a brief history of the development of LED display devices. The development trend has certain reference value for Chinese engineers engaged in display device development.
The advent of blue LEDs has made it possible to partially convert higher-energy blue light into other colors using backward-converting phosphorescent materials. All saturated colors in the CIE chromaticity curve can be completely covered with LED light sources alone, and the organic integration of various color LEDs with phosphors can produce almost any color without limitation. In terms of reliability, the half-life of an LED (the time it takes for the light output to decrease to half its original value) is about 10,000 to 100,000 hours. In contrast, the half-life of small indicating incandescent lamps (here half-life refers to the time when half the number of lamps fail) is typically in the range of 100,000 to several thousand hours, depending on the rated operating current of the lamp.
