The main function of led display
2023-02-02 10:17
The LED display screen is an electronic display screen composed of LED dot matrix. By turning on and off the traffic light beads to replace the screen display content forms such as text, animation, pictures, and video, the timely conversion is performed, and the component display control is performed through a 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 a screen to emit light; the control system is to control the on and 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 transformation 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 luminous intensity, low working 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 LED are related to the material and process of making LED. At the beginning, the light bulb is all blue light, and phosphor powder is added later. According to the different needs of users, different light colors can be adjusted. Red is widely used. , green, blue and yellow. Due to the low working voltage of the LED (only 1.2~4.0V), it can actively emit light and have a certain brightness, and the brightness can be adjusted by voltage (or current), and it is shock-resistant, vibration-resistant, and has a long life (100,000 hours). Among the large display devices, there is no other display method comparable to the LED display method.
LED, Light Emitting Diode (light emitting diode abbreviation). It is a diode made of a compound made of gallium (Ga) and arsenic (As), phosphorus (P), nitrogen (N), and indium (In) by controlling the display mode of a semiconductor light-emitting diode. When electrons and holes Visible light can be radiated when recombined, so it can be used to make light-emitting diodes. It is used as an indicator light in circuits and instruments, or as a text or number display. 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.
The display screen made by putting red and green LED chips or light tubes together as a pixel is called a three-color or dual-primary color screen. Putting red, green, and blue LED chips or light 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 monochrome or single-primary color screen. The pixel size of indoor LED screen is generally 1.5-12 mm. The size is mostly 6-41.5 mm. 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. Green 1 blue composition.
Regardless of using LEDs to make single-color, two-color or three-color screens, the luminance of each LED that constitutes a pixel must be adjustable to display an image, and the fineness of its adjustment is the gray level of the display screen. The higher the gray level, the more delicate the image displayed, the richer the color, and the more complex the corresponding display control system. Generally, for images with 256-level grayscale, the color transition is already very soft, while for color images with 16-level grayscale, the boundary line of color transition is very obvious. Therefore, color LED screens are currently required to be made of 256 to 4096 gray levels.
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2023-02-02
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