This article mainly introduces the following aspects.
First, LED lighting fixtures currently have problems
1. Problems caused by inconsistency: As there are no national standards and industry standards for LED performance testing in China, LED products appearing on the market are mixed, and some are shoddy. This not only has adversely affected the users, but also brought troubles in design and testing to the lighting manufacturers, affecting the sustainable and healthy development of China's LED industry.
2, the driver circuit is complex: due to the characteristics of the LED itself, it can not be directly connected to the 220V AC voltage like an ordinary incandescent lamp, in the design of the lamp must use a certain conversion circuit. Such as buck, voltage regulation, current limit, power factor correction and other circuits.
Second, the characteristics of LED lighting circuit:
Third, the solution to the problem
Fourth, model selection
5. WHPTC series products can be used for the circuit protection of the following lighting, decoration, landscape and other lamps.
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According to the different backlight sources, LCDs can be divided into two types: CCFL displays and LED displays.
Misunderstanding:
Many users believe that liquid crystal displays can be divided into LEDs and LCDs. To some extent, this understanding is misguided by advertisements.
The LED display on the market is not a true LED display. To be precise, it is an LED-backlit Liquid Crystal Display. The liquid crystal panel is still a traditional LCD display. In a sense, this is somewhat fraudulent. nature! South Korea`s Samsung was once convicted by the British Advertising Association as violating the country`s advertising laws because its [LEDTV" LCD TVs were suspected of misleading consumers. For liquid crystal displays, the most important key is its LCD panel and backlight type, while the LCD panels of displays on the market generally use TFT panels, which are the same. The difference between LEDs and LCDs is only their backlight types: LED The backlight and CCFL backlight (that is, fluorescent lamps) are diodes and cold cathode lamps, respectively.
LCD is the acronym for Liquid Crystal Display, which means "liquid crystal display", that is, liquid crystal display. The LED display refers to a type of liquid crystal display (LCD), that is, a liquid crystal display (LCD) with LED (light emitting diode) as the backlight source. It can be seen that LCD includes LEDs. Corresponding to the LED display is actually a CCFL display.
(1) CCFL
Refers to a liquid crystal display (LCD) with CCFL (cold cathode fluorescent lamp) as the backlight source.
The advantage of CCFL display is good color performance, but the disadvantage is higher power consumption.
(2) LED
Refers to a liquid crystal display (LCD) that uses LEDs (light emitting diodes) as a backlight source, and generally refers to WLEDs (white light LEDs).
The advantages of LED displays are small size and low power consumption. Therefore, using LEDs as a backlight source can achieve high brightness while taking into account lightness and thinness. The main disadvantage is that the color performance is worse than that of CCFL monitors, so most professional graphics LCDs still use traditional CCFL as the backlight source.
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