At present, LED is developing rapidly, the technology is becoming more and more mature, and LED technology is gradually applied in various aspects. Many LED products have attracted the attention of the public with their high-quality pictures and energy-saving energy consumption. However, the related operation of LED is not a seemingly simple thing, and it is necessary to require the device to strictly and finely require the driver. The following is a related explanation of the LED driver application and driving method of the backbone of the LED.
Application of LED Driver
Since LED applications are almost in all fields of electronic applications, the changes in luminous intensity, light color and on-off control are almost unpredictable, so the LED driver has become an almost one-to-one servo device, making this device Family members become diverse. The simplest LED driver (if you can call it that) may be one or several series-parallel resistor-capacitor components in the loop to divide the current and divide the voltage, it is not an independent product at all. For more general commercial applications requiring stable constant current and constant voltage output, a series of system solutions with precise power regulation capabilities have been formed. The realization of these solutions usually requires a relatively complex circuit design, the core of which is the integrated application of LED driver ICs. By setting up different support circuits on the periphery of the LED driver IC, we can build solutions for different LED applications, ranging from mobile phone display backlights and button lighting drivers to high-power LED street lights and large outdoor LED displays.
The design and supply of more general high-power LED drivers are generally undertaken by professional companies. These companies supply it to LED end-use product manufacturers after secondary packaging into modules. And the driver design of the less common LED end application products may need to be designed by yourself. It has become an important part of the unique technical content of this LED terminal application product. Because the LED as a packaged product is in the upstream, its technical performance has been solidified in the LED product, and to create a unique terminal LED application product, for the light source, in addition to the LED driving function, there are other places that can be worked hard. Not many more.
Due to the unique importance of LED drivers in LED application products and the wide range of user needs, the LED driver IC, which is the heart of the LED driver, has become a key element in the entire technical link. It has prompted many manufacturers, including many listed companies, to supply LED driver ICs to downstream industries with LED drivers as their main products, such as Hangzhou Silan Microelectronics, Shenzhen Quanxin Electronics, Shenzhen Guanghuayuan Technology, Shenzhen State Microelectronics, China Resources Siwei Technology, Dianjing Technology, Macroblock Technology, Guangpeng Technology, Taijing Technology, Feihong, Maoda, Yuanchuang and so on in Taiwan. There are also many American manufacturers with industry leaders in this field, such as National Semiconductor, Maxim, Texas Instruments, ON Semiconductor, Linear Technology, Fairchild and so on.
LED driver driving method
In terms of full-color LED video displays, it is a display capable of displaying images and animations in millions of colors. LED display application scenarios include stadiums, building exteriors, shopping malls, and TV studios. Large LED displays are used to broadcast advertisements and information, replay sports events or concerts. The working principle of the LED driver: the video input signals provided by different types of video sources are processed and sent to the LED display. The entire display screen is usually composed of several square or rectangular lattices, and each lattice is composed of several pixels. Each pixel consists of RGB (red, green, blue) LED tubes, and by mixing the light colors of these LEDs, the desired pixel information is generated. The LED driver is equivalent to the interface between the processed video data and the colored lights emitted by the RGBLEDs (the images are composed of these colored lights). The signal quality and data processing capability of the original image are the preconditions for obtaining good image quality. Display size, resolution, pixel pitch and LED selection are key parameters that determine the image quality perceived by the human eye. It is necessary to choose a suitable LED driver that can convert the processed image data into the desired color and animation effects. In terms of color and animation, in order to achieve excellent picture quality, it is necessary to integrate many different functions: high frame rate, high refresh rate, color reproduction accuracy, etc. However, the quality of the display refers not only to the image itself, but also to the overall quality of the solution, such as noise immunity and reliability. Therefore, all color LED displays require the selection of technically sophisticated LED drivers.
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