The LED display screen is an electronic display screen composed of LED dot matrix. By changing the red and green light beads on and off, the screen display content forms such as text, animation, pictures, and videos are converted in time, and the component display control is carried out through the modular structure. It is mainly divided into display module, control system and power supply system. The display module is a dot matrix of LED lights to form the screen to emit light; the control system is to control the on-off conditions in the area to convert the content displayed on the screen; the power system is to convert the input voltage and current to meet the needs of the display screen.
The LED screen can realize the conversion between different forms of various information presentation modes, and can be used indoors and outdoors, and has incomparable advantages over other display screens. With the characteristics of high brightness, low power consumption, low voltage demand, small and convenient equipment, long service life, stable impact resistance, and strong resistance to external interference, it has developed rapidly and is widely used in various fields.
The luminous color and luminous efficiency of LEDs are related to the materials and processes used to make the LEDs. The light bulbs are all blue at first, and phosphors are added later to adjust different light colors according to the different needs of users. Red is widely used. , green, blue and yellow. Due to the low operating voltage of the LED (only 1.2~4.0V), it can actively emit light and has a certain brightness, and the brightness can be adjusted by voltage (or current), and it is resistant to shock, vibration, and long life (100,000 hours). In the large-scale display device, there is no other display method that can match the LED display method. LED, light emitting diode (light emitting diode abbreviation). It is a display method by controlling semiconductor light-emitting diodes. It is a diode made of gallium (Ga) and arsenic (As), phosphorus (P), nitrogen (N), and indium (In) compounds. When electrons and holes It can radiate visible light when recombined, so it can be used to make light-emitting diodes. Used as indicator lights in circuits and instruments, or composed of text or digital displays. Gallium arsenide phosphide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and indium gallium nitride diodes emit blue light.
A display screen made by putting red and green LED chips or tubes together as a pixel is called a three-color or dual-primary color screen. Putting red, green, and blue LED chips or tubes together as a pixel display The screen is called a three-color screen or a full-color screen. If there is only one color, it is called a single-color or single-color screen. The pixel size of an indoor LED screen is generally 1.5-12 mm. It is often used to package several LED dies that can produce different primary colors. The size is mostly 6-41.5 mm, and each pixel is composed of several single-color LEDs. The common finished product is called a pixel tube. The two-color pixel tube is generally composed of 2 red and 1 green, and the three-color pixel tube uses 1 red and 1 Green 1 blue composition.
Regardless of whether LEDs are used to make a single-color, two-color or three-color screen, to display an image, the luminous brightness of each LED that constitutes a pixel must be adjustable, and the fineness of the adjustment is the gray level of the display screen. The higher the gray level, the more delicate and colorful the displayed image, and the more complex the corresponding display control system. Generally, a 256-level grayscale image has a very soft color transition, while a 16-level grayscale color image has a very clear color transition boundary. Therefore, color LED screens are currently required to be made into 256 to 4096 grayscales.